Bio

Bio

Professor Cappelli is the author of over 100 papers in these areas. He is currently a member of the Editorial Board of Diamond Films and Technology. He is also secretary of the Electric Propulsion Technical Committee of the American Institute for Aeronautics and Astronautics.

Academic Appointments

Professional Education

  • PhD, University of Toronto, Aerospace Science and Engineering (1987)

Contact

Teaching

2013-14 Courses

Postdoctoral Advisees

Publications

Journal Articles

  • Plasma Actuator Control of a Lifted Ethane Turbulent Jet Diffusion Flame IEEE TRANSACTIONS ON PLASMA SCIENCE Im, S., Bak, M. S., Mungal, M. G., Cappelli, M. A. 2013; 41 (12): 3293-3298

    View details for DOI 10.1109/TPS.2013.2277722

    View details for Web of Science ID 000328701100015

  • Dielectric Barrier Discharge-Induced Vortex Generation With Discharge-Actuated Boundary Layer Bleed IEEE TRANSACTIONS ON PLASMA SCIENCE Im, S., Bak, M. S., Mungal, M. G., Cappelli, M. A. 2013; 41 (12): 3245-3253

    View details for DOI 10.1109/TPS.2013.2278027

    View details for Web of Science ID 000328701100009

  • Studies on the stability limit extension of premixed and jet diffusion flames of methane, ethane, and propane using nanosecond repetitive pulsed discharge plasmas COMBUSTION AND FLAME Bak, M. S., Im, S., Mungal, M. G., Cappelli, M. A. 2013; 160 (11): 2396-2403

    View details for DOI 10.1016/j.combustflame.2013.05.023

    View details for Web of Science ID 000324006400010

  • A study of flow induced by laser induced breakdown-enhanced dielectric barrier discharges in air APPLIED PHYSICS LETTERS Im, S., Bak, M. S., Cappelli, M. A. 2013; 103 (16)

    View details for DOI 10.1063/1.4825373

    View details for Web of Science ID 000326148700101

  • A Thomson-type mass and energy spectrometer for characterizing ion energy distributions in a coaxial plasma gun operating in a gas-puff mode PHYSICS OF PLASMAS Rieker, G. B., Poehlmann, F. R., Cappelli, M. A. 2013; 20 (7)

    View details for DOI 10.1063/1.4816028

    View details for Web of Science ID 000322535400063

  • Simulations of nanosecond-pulsed dielectric barrier discharges in atmospheric pressure air JOURNAL OF APPLIED PHYSICS Bak, M. S., Cappelli, M. A. 2013; 113 (11)

    View details for DOI 10.1063/1.4795269

    View details for Web of Science ID 000316545200011

  • The manipulation of an unstarting supersonic flow by plasma actuator JOURNAL OF PHYSICS D-APPLIED PHYSICS Im, S., Do, H., Cappelli, M. A. 2012; 45 (48)

    View details for DOI 10.1088/0022-3727/45/48/485202

    View details for Web of Science ID 000311148300009

  • Optically pumped cesium plasma neutralization of space charge in photon-enhanced thermionic energy converters APPLIED PHYSICS LETTERS Ito, T., Cappelli, M. A. 2012; 101 (21)

    View details for DOI 10.1063/1.4767349

    View details for Web of Science ID 000311477600075

  • Time-synchronized continuous wave laser-induced fluorescence on an oscillatory xenon discharge REVIEW OF SCIENTIFIC INSTRUMENTS MacDonald, N. A., Cappelli, M. A., Hargus, W. A. 2012; 83 (11)

    Abstract

    A novel approach to time-synchronizing laser-induced fluorescence measurements to an oscillating current in a 60 Hz xenon discharge lamp using a continuous wave laser is presented. A sample-hold circuit is implemented to separate out signals at different phases along a current cycle, and is followed by a lock-in amplifier to pull out the resulting time-synchronized fluorescence trace from the large background signal. The time evolution of lower state population is derived from the changes in intensity of the fluorescence excitation line shape resulting from laser-induced fluorescence measurements of the 6s(')[1/2](1)(0)-6p(')[3/2](2) xenon atomic transition at ? = 834.68 nm. Results show that the lower state population oscillates at twice the frequency of the discharge current, 120 Hz.

    View details for DOI 10.1063/1.4766958

    View details for Web of Science ID 000312034400018

    View details for PubMedID 23206061

  • Plasma-assisted stabilization of laminar premixed methane/air flames around the lean flammability limit COMBUSTION AND FLAME Bak, M. S., Do, H., Mungal, M. G., Cappelli, M. A. 2012; 159 (10): 3128-3137

    View details for DOI 10.1016/j.combustflame.2012.03.023

    View details for Web of Science ID 000308619100013

  • Dielectric barrier discharge induced boundary layer suction APPLIED PHYSICS LETTERS Im, S., Cappelli, M. A. 2012; 100 (26)

    View details for DOI 10.1063/1.4731288

    View details for Web of Science ID 000305831500108

  • Ion velocity and plasma potential measurements of a cylindrical cusped field thruster JOURNAL OF APPLIED PHYSICS MacDonald, N. A., Young, C. V., Cappelli, M. A., Hargus, W. A. 2012; 111 (9)

    View details for DOI 10.1063/1.4707953

    View details for Web of Science ID 000304109900016

  • Nanoparticle production in arc generated fireballs of granular silicon powder AIP ADVANCES Ito, T., Cappelli, M. A. 2012; 2 (1)

    View details for DOI 10.1063/1.3681283

    View details for Web of Science ID 000302225400044

  • The Structure of Nanosecond Repetitively Pulsed Spark Discharges in Air IEEE TRANSACTIONS ON PLASMA SCIENCE Pai, D. Z., Cappelli, M. A., Laux, C. O. 2011; 39 (11): 2258-2259

    View details for DOI 10.1109/TPS.2011.2160656

    View details for Web of Science ID 000299683400102

  • The influence of boundary layers on supersonic inlet flow unstart induced by mass injection EXPERIMENTS IN FLUIDS Do, H., Im, S., Mungal, M. G., Cappelli, M. A. 2011; 51 (3): 679-691

    View details for DOI 10.1007/s00348-011-1077-3

    View details for Web of Science ID 000294347800009

  • Laser-induced fluorescence velocity measurements of a diverging cusped-field thruster JOURNAL OF PHYSICS D-APPLIED PHYSICS MacDonald, N. A., Cappelli, M. A., Gildea, S. R., Martinez-Sanchez, M., Hargus, W. A. 2011; 44 (29)

    View details for DOI 10.1088/0022-3727/44/29/295203

    View details for Web of Science ID 000292383000011

  • Visualizing supersonic inlet duct unstart using planar laser Rayleigh scattering EXPERIMENTS IN FLUIDS Do, H., Im, S., Mungal, M. G., Cappelli, M. A. 2011; 50 (6): 1651-1657

    View details for DOI 10.1007/s00348-010-1028-4

    View details for Web of Science ID 000291042300014

  • On the quenching of excited electronic states of molecular nitrogen in nanosecond pulsed discharges in atmospheric pressure air APPLIED PHYSICS LETTERS Bak, M. S., Kim, W., Cappelli, M. A. 2011; 98 (1)

    View details for DOI 10.1063/1.3535986

    View details for Web of Science ID 000286009800014

  • Plasma assisted flame ignition of supersonic flows over a flat wall COMBUSTION AND FLAME Do, H., Im, S., Cappelli, M. A., Mungal, M. G. 2010; 157 (12): 2298-2305

    View details for DOI 10.1016/j.combustflame.2010.07.006

    View details for Web of Science ID 000283967300009

  • Current distribution measurements inside an electromagnetic plasma gun operated in a gas-puff mode PHYSICS OF PLASMAS Poehlmann, F. R., Cappelli, M. A., Rieker, G. B. 2010; 17 (12)

    View details for DOI 10.1063/1.3526603

    View details for Web of Science ID 000285770500069

  • Plasma assisted cavity flame ignition in supersonic flows COMBUSTION AND FLAME Do, H., Cappelli, M. A., Mungal, M. G. 2010; 157 (9): 1783-1794

    View details for DOI 10.1016/j.combustflame.2010.03.009

    View details for Web of Science ID 000280267700015

  • On the role of fluctuations, cathode placement, and collisions on the transport of electrons in the near-field of Hall thrusters PHYSICS OF PLASMAS Smith, A. W., Cappelli, M. A. 2010; 17 (9)

    View details for DOI 10.1063/1.3479827

    View details for Web of Science ID 000282439300032

  • Dielectric barrier discharge control of a turbulent boundary layer in a supersonic flow APPLIED PHYSICS LETTERS Im, S., Do, H., Cappelli, M. A. 2010; 97 (4)

    View details for DOI 10.1063/1.3473820

    View details for Web of Science ID 000281059200020

  • Single particle simulations of electron transport in the near-field of Hall thrusters JOURNAL OF PHYSICS D-APPLIED PHYSICS Smith, A. W., Cappelli, M. A. 2010; 43 (4)

    View details for DOI 10.1088/0022-3727/43/4/045203

    View details for Web of Science ID 000273551300009

  • The role of in situ reforming in plasma enhanced ultra lean premixed methane/air flames COMBUSTION AND FLAME Kim, W., Mungal, M. G., Cappelli, M. A. 2010; 157 (2): 374-383

    View details for DOI 10.1016/j.combustflame.2009.06.016

    View details for Web of Science ID 000273702400018

  • Structure of laboratory ball lightning PHYSICAL REVIEW E Ito, T., Tamura, T., Cappelli, M. A., Hamaguchi, S. 2009; 80 (6)

    Abstract

    Trajectories of self-sustained laboratory ball lightning, generated by arc discharges with silicon, are investigated for understanding the possibility of buoyant flight. Extremely low apparent densities are found, nearly approaching that of standard air. The freely buoyant balls are observed to survive for about 0.1 s, with significantly buoyant balls surviving for several seconds. These ball lightning objects are found to have a density and size that can easily allow them to be carried by a gentle breeze of a few meters per second. The results are interpreted by a model that is an extension of that first proposed by Abrahamson and Dinniss [J. Abrahamson and J. Dinniss, Nature (London) 403, 519 (2000)]. The buoyant behavior of ball lightning seen in our experiments is believed to arise as a result of the formation of a nanoparticle oxide network growing from a molten silicon core.

    View details for DOI 10.1103/PhysRevE.80.067401

    View details for Web of Science ID 000273228000094

    View details for PubMedID 20365306

  • Energetic neutrals in the cathode sheath of argon direct-current discharges JOURNAL OF APPLIED PHYSICS Ito, T., Cappelli, M. A. 2009; 106 (2)

    View details for DOI 10.1063/1.3160329

    View details for Web of Science ID 000268613000020

  • Time and space-correlated plasma potential measurements in the near field of a coaxial Hall plasma discharge PHYSICS OF PLASMAS Smith, A. W., Cappelli, M. A. 2009; 16 (7)

    View details for DOI 10.1063/1.3155097

    View details for Web of Science ID 000268615200058

  • Electrostatic probe disruption of drift waves in magnetized microdischarges APPLIED PHYSICS LETTERS Ito, T., Cappelli, M. A. 2009; 94 (21)

    View details for DOI 10.1063/1.3132587

    View details for Web of Science ID 000266500400009

  • The Hall effect and rocket flight PHYSICS TODAY Cappelli, M. 2009; 62 (4): 76-77

    View details for Web of Science ID 000264991800022

  • Jet Flame Ignition in a Supersonic Crossflow Using a Pulsed Nonequilibrium Plasma Discharge IEEE TRANSACTIONS ON PLASMA SCIENCE Do, H., Mungal, M. G., Cappelli, M. A. 2008; 36 (6): 2918-2923

    View details for DOI 10.1109/TPS.2008.2005986

    View details for Web of Science ID 000262061900007

  • A Study of Plasma-Stabilized Diffusion Flames at Elevated Ambient Temperatures IEEE TRANSACTIONS ON PLASMA SCIENCE Kim, W., Do, H., Mungal, M. G., Cappelli, M. A. 2008; 36 (6): 2898-2904

    View details for DOI 10.1109/TPS.2008.2004345

    View details for Web of Science ID 000262061900004

  • Shear-Based Model for Electron Transport in Hybrid Hall Thruster Simulations IEEE TRANSACTIONS ON PLASMA SCIENCE Scharfe, M. K., Thomas, C. A., Scharfe, D. B., Gascon, N., Cappelli, M. A., Fernandez, E. 2008; 36 (5): 2058-2068

    View details for DOI 10.1109/TPS.2008.2004364

    View details for Web of Science ID 000261363100011

  • An analysis of millimetre-wave interferometry on Hall thruster plumes by finite difference time domain simulations JOURNAL OF PHYSICS D-APPLIED PHYSICS Lee, J., Cappelli, M. A. 2008; 41 (18)

    View details for DOI 10.1088/0022-3727/41/18/185205

    View details for Web of Science ID 000258985500021

  • A simple isentropic model of electron transport in Hall thrusters JOURNAL OF PHYSICS D-APPLIED PHYSICS Knoll, A. K., Cappelli, M. A. 2008; 41 (16)

    View details for DOI 10.1088/0022-3727/41/16/162003

    View details for Web of Science ID 000258221100003

  • High speed images of drift waves and turbulence in magnetized microplasmas IEEE TRANSACTIONS ON PLASMA SCIENCE Ito, T., Cappelli, M. A. 2008; 36 (4): 1228-1229

    View details for DOI 10.1109/TPS.2003.927347

    View details for Web of Science ID 000258618200184

  • Optimal discharge placement in plasma-assisted combustion of a methane jet in cross flow COMBUSTION AND FLAME Kim, W., Do, H., Mungal, M. G., Cappelli, M. A. 2008; 153 (4): 603-615

    View details for DOI 10.1016/j.combustflame.2007.11.015

    View details for Web of Science ID 000256319800009

  • Cross-talk in multiple dielectric barrier discharge actuators APPLIED PHYSICS LETTERS Do, H., Kim, W., Cappelli, M. A., Mungal, M. G. 2008; 92 (7)

    View details for DOI 10.1063/1.2885085

    View details for Web of Science ID 000253540500021

  • Formation and role of cool flames in plasma-assisted premixed combustion APPLIED PHYSICS LETTERS Kim, W., Mungal, M. G., Cappelli, M. A. 2008; 92 (5)

    View details for DOI 10.1063/1.2841894

    View details for Web of Science ID 000253016500020

  • Magnetized microdischarge plasmas in low pressure argon and helium SECOND INTERNATIONAL SYMPOSIUM ON ATOMIC TECHNOLOGY Kobayashi, K., Ito, T., Cappelli, M. A., Hamaguchi, S. 2008; 106

    View details for DOI 10.1088/1742-6596/106/1/012020

    View details for Web of Science ID 000259999900020

  • Growth of resistive instabilities in ExB plasma discharge simulations PHYSICS OF PLASMAS Fernandez, E., Scharfe, M. K., Thomas, C. A., Gascon, N., Cappelli, M. A. 2008; 15 (1)

    View details for DOI 10.1063/1.2823033

    View details for Web of Science ID 000252821500004

  • On the role of oxygen in dielectric barrier discharge actuation of aerodynamic flows APPLIED PHYSICS LETTERS Kim, W., Do, H., Mungal, M. G., Cappelli, M. A. 2007; 91 (18)

    View details for DOI 10.1063/1.2803755

    View details for Web of Science ID 000250643600025

  • Simulating plasma-induced hall thruster wall erosion with a two-dimensional hybrid model IEEE TRANSACTIONS ON PLASMA SCIENCE Sommer, E., Scharfe, M. K., Gascon, N., Cappelli, M. A., Fernandez, E. 2007; 35 (5): 1379-1387

    View details for DOI 10.1109/TPS.2007.905943

    View details for Web of Science ID 000250993200023

  • Experimental characterization of a micro-hall thruster JOURNAL OF PROPULSION AND POWER Ito, T., Gascon, N., Crawford, W. S., Cappelli, M. A. 2007; 23 (5): 1068-1074

    View details for DOI 10.2514/1.27140

    View details for Web of Science ID 000249671200021

  • On the production of energetic neutrals in the cathode sheath of direct-current discharges APPLIED PHYSICS LETTERS Ito, T., Cappelli, M. A. 2007; 90 (10)

    View details for DOI 10.1063/1.2711416

    View details for Web of Science ID 000244791700022

  • Investigation of NO production and flame structure in plasma enhanced premixed combustion PROCEEDINGS OF THE COMBUSTION INSTITUTE Kim, W., Do, H., Mungal, M. G., Cappelli, M. A. 2007; 31: 3319-3326

    View details for DOI 10.1016/j.proci.2006.07.107

    View details for Web of Science ID 000252858200189

  • Plasma-discharge stabilization of jet diffusion flames IEEE TRANSACTIONS ON PLASMA SCIENCE Kim, W., Do, H., Mungal, M. G., Cappelli, M. A. 2006; 34 (6): 2545-2551

    View details for DOI 10.1109/TPS.2006.886084

    View details for Web of Science ID 000242922800011

  • Millimetre wave plasma interferometry in the near field of a Hall plasma accelerator JOURNAL OF PHYSICS D-APPLIED PHYSICS Cappelli, M. A., Gascon, N., Hargus, W. A. 2006; 39 (21): 4582-4588

    View details for DOI 10.1088/0022-3727/39/21/013

    View details for Web of Science ID 000242476000015

  • Nonintrusive characterization of the azimuthal drift current in a coaxial E x B discharge plasma PHYSICAL REVIEW E Thomas, C. A., Gascon, N., Cappelli, M. A. 2006; 74 (5)

    Abstract

    A diagnostic is developed for the nonintrusive study of the azimuthal drift current in the coaxial ExB discharge of a Hall plasma accelerator. The technique of fast current interruption is used to generate a signal on several loop antenna that circle the outer wall of the discharge channel. The signal on the antenna is recorded, and used to determine the spatial distribution of the azimuthal drift at the moment of current interruption. The results of the experiment are compared to estimates derived via prior intrusive measurements, and the intrusive estimates are found to predict the spatial characteristics of the azimuthal drift, but underestimate its total magnitude. The self-induced magnetic field is then calculated and added to the applied magnetic field. The peak total magnetic field is seen to shift 2-5mm towards the anode due to self-induction, and suffer a reduction in magnitude of 10%-15%. The peak in the total magnetic field is then found to more closely coincide with the peak of the measured electric field than the peak of the vacuum magnetic field. It is concluded that the self-induced magnetic field could be important to anomalous electron mobility in the Hall-effect thruster, and simulation efforts should try to include its impact.

    View details for DOI 10.1103/PhysRevE.74.056402

    View details for Web of Science ID 000242408800038

    View details for PubMedID 17279996

  • Aerodynamic modification of flow over bluff objects by plasma actuation EXPERIMENTS IN FLUIDS Sung, Y., Kim, W., Mungal, M. G., Cappelli, M. A. 2006; 41 (3): 479-486

    View details for DOI 10.1007/s00348-006-0175-0

    View details for Web of Science ID 000240058000011

  • Low-power magnetized microdischarge ion source APPLIED PHYSICS LETTERS Ito, T., Cappelli, M. A. 2006; 89 (6)

    View details for DOI 10.1063/1.2335612

    View details for Web of Science ID 000239690800028

  • Comparison of hybrid Hall thruster model to experimental measurements PHYSICS OF PLASMAS Scharfe, M. K., Gascon, N., Cappelli, M. A., Fernandez, E. 2006; 13 (8)

    View details for DOI 10.1063/1.2336186

    View details for Web of Science ID 000240237700052

  • Ion energy distribution and gas heating in the cathode fall of a direct-current microdischarge PHYSICAL REVIEW E Ito, T., Cappelli, M. A. 2006; 73 (4)

    Abstract

    This paper reports on measurements of the ion energy distribution (IED) at the cathode of an argon dc microdischarge using energy-resolved molecular beam mass spectrometry. The measurements are conducted at a fixed pressure-electrode separation product (pd) of 1 cm Torr with a maximum discharge pressure of 20 Torr. The measured IED is compared to the theory of Davis and Vanderslice [W. D. Davis and T. A. Vanderslice, Phys. Rev. 131, 219 (1963)]. A higher pressure in a case of almost constant normalized current densities by pressure (Jp(-2) = 0.080+/-0.006 mA/cm(-2) Torr(-2)) yields a lower ratio of the ion mean free path to the sheath thickness. The results in almost constant Jp(-2) case then indicate that a scaling law of Jp(-2) is no longer applicable for IED of microdischarge. Expected background gaseous temperatures from IEDs with the collisional Child law have reasonable increasing with increased current density (J) in both cases of almost constant Jp(-2) and a constant pressure of 10 Torr. Supported by temperature measurement by laser absorption spectroscopy, it is demonstrated that the expanded theory might be applicable also to microdischarges (Ar approximately 20 Torr) with temperature adjusting.

    View details for DOI 10.1103/PhysRevE.73.046401

    View details for Web of Science ID 000237146800070

    View details for PubMedID 16711933

  • Arcjet plasma neutralization of Hall thrusters, Part 1: Hybrid thruster mission analysis JOURNAL OF SPACECRAFT AND ROCKETS Hargus, W. A., Schilling, J. H., Walker, Q. E., Cappelli, M. A. 2004; 41 (6): 1016-1022

    View details for Web of Science ID 000225846700014

  • Arcjet neutralization of Hall thrusters, Part 2: Experimental demonstration JOURNAL OF SPACECRAFT AND ROCKETS Walker, Q. E., Gascon, N., Cappelli, M. A., Hargus, W. A., Schilling, J. A. 2004; 41 (6): 1023-1030

    View details for Web of Science ID 000225846700015

  • Mechanism for anomalously high voltages in high-pressure dc microdischarge mixtures of He, Ne, and Xe JOURNAL OF APPLIED PHYSICS Ganter, R., Cappelli, M. 2003; 94 (3): 2145-2147

    View details for DOI 10.1063/1.1590406

    View details for Web of Science ID 000184400400130

  • Kinetic and surface mechanisms to growth of hexagonal boron nitride SURFACE ENGINEERING 2002-SYNTHESIS, CHARACTERIZATION AND APPLICATIONS Barreto, P. R., Kull, A. E., Cappelli, M. A. 2003; 750: 313-318

    View details for Web of Science ID 000183595500050

  • Optical measurements of plasma velocity and temperature in a low-rate, low-power LPPS system SURFACE & COATINGS TECHNOLOGY Hamatani, H., Crawford, W. S., Cappelli, M. A. 2003; 162 (1): 79-92

    View details for Web of Science ID 000178898100011

  • Laser-induced-fluorescence characteristics of a helium arcjet flow APPLIED PHYSICS B-LASERS AND OPTICS Walker, Q. E., Cappelli, M. A. 2002; 75 (6-7): 717-722

    View details for DOI 10.1007/s00340-002-1050-1

    View details for Web of Science ID 000180587100017

  • Kinetic study of wall collisions in a coaxial Hall discharge PHYSICAL REVIEW E Meezan, N. B., Cappelli, M. A. 2002; 66 (3)

    Abstract

    Coaxial Hall discharges (also known as Hall thrusters, stationary plasma thrusters, and closed-drift accelerators) are cross-field plasma sources under development for space propulsion applications. The importance of the electron-wall interaction to the Hall discharge operation is studied the through analysis of experimental data and simulation of the electron energy distribution function (EEDF) inside the discharge channel. Experimental time-average plasma property data from a laboratory Hall discharge are used to calculate the electron conductivity and to estimate the rate of wall-loss collisions. The electron Boltzmann equation is then solved in the local field limit, using the experimental results as inputs. The equation takes into account ionization and wall collisions, including secondary electrons produced at the wall. Local electron balances are used to calculate the sheath potential at the insulator walls. Results show an EEDF depleted at high energy due to electron loss to the walls. The calculated EEDFs agree well with experimental electron temperature data when the experimentally determined effective collision frequency is used for electron momentum transport. The electron wall-loss and wall-return frequencies are extremely low compared to those predicted by a Maxwellian of equal average energy. The very low frequency of wall collisions suggests that secondary electrons do not contribute to cross-field transport. This conclusion holds despite significant experimental uncertainty.

    View details for DOI 10.1103/PhysRevE.66.036401

    View details for Web of Science ID 000178624400015

    View details for PubMedID 12366261

  • Ion beam dynamics in a linear Hall discharge IEEE TRANSACTIONS ON PLASMA SCIENCE Meezan, N. B., Cappelli, M. A. 2002; 30 (1): 138-139

    View details for Web of Science ID 000175845900068

  • Interior and exterior laser-induced fluorescence and plasma measurements within a Hall thruster JOURNAL OF PROPULSION AND POWER Hargus, W. A., Cappelli, M. A. 2002; 18 (1): 159-168

    View details for Web of Science ID 000173577200019

  • A characterization of plasma fluctuations within a hall discharge IEEE TRANSACTIONS ON PLASMA SCIENCE Chesta, E., Lam, C. M., Meezan, N. B., Schmidt, D. P., Cappelli, M. A. 2001; 29 (4): 582-591

    View details for Web of Science ID 000170571500003

  • Laser-induced fluorescence measurements of velocity within a Hall discharge APPLIED PHYSICS B-LASERS AND OPTICS Hargus, W. A., Cappelli, M. A. 2001; 72 (8): 961-969

    View details for Web of Science ID 000169039800011

  • Mass spectrometric and Langmuir probe measurements in inductively coupled plasmas in Ar, CHF3/As and CHF3/Ar/O-2 mixtures PLASMA SOURCES SCIENCE & TECHNOLOGY Kim, J. S., Rao, M. V., Cappelli, M. A., Sharma, S. P., Meyyappan, M. 2001; 10 (2): 191-204

    View details for Web of Science ID 000169258200009

  • Parametric study of the vacuum ultraviolet emission and electrical characteristics of a He-Xe microdischarge JOURNAL OF APPLIED PHYSICS Postel, O. B., Cappelli, M. A. 2001; 89 (9): 4719-4726

    View details for Web of Science ID 000168130100006

  • Stability of a magnetized Hall plasma discharge JOURNAL OF APPLIED PHYSICS Chesta, E., Meezan, N. B., Cappelli, M. A. 2001; 89 (6): 3099-3107

    View details for Web of Science ID 000167248100005

  • Anomalous electron mobility in a coaxial Hall discharge plasma PHYSICAL REVIEW E Meezan, N. B., Hargus, W. A., Cappelli, M. A. 2001; 63 (2)

    Abstract

    A comprehensive analysis of measurements supporting the presence of anomalous cross-field electron mobility in Hall plasma accelerators is presented. Nonintrusive laser-induced fluorescence measurements of neutral xenon and ionized xenon velocities, and various electrostatic probe diagnostic measurements are used to locally determine the effective electron Hall parameter inside the accelerator channel. These values are then compared to the classical (collision-driven) Hall parameters expected for a quiescent magnetized plasma. The results indicate that in the vicinity of the anode, where there are fewer plasma instabilities, the electron-transport mechanism is likely elastic collisions with the background neutral xenon. However, we find that in the vicinity of the discharge channel exit, where the magnetic field is the strongest and where there are intense fluctuations in the plasma properties, the inferred Hall parameter departs from the classical value, and is close to the Bohm value of (omega(ce)tau)(eff) approximately 16. These results are used to support a simple model for the Hall parameter that is based on the scalar addition of the electron collision frequencies (elastic collision induced plus fluctuation induced), as proposed by Boeuf and Garrigues [J. Appl. Phys. 84, 3541 (1998)]. The results also draw attention to the possible role of fluctuations in enhancing electron transport in regions where the electrons are highly magnetized.

    View details for Web of Science ID 000167022500062

    View details for PubMedID 11308588

  • Doppler-free absorption measurements of Stark broadening in a flowing hydrogen plasma JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Cappelli, M. A., Walker, Q. E., Storm, P. V. 2000; 66 (4): 343-361

    View details for Web of Science ID 000087091600003

  • Methyl concentration measurements during microwave plasma-assisted diamond deposition PLASMA CHEMISTRY AND PLASMA PROCESSING Cappelli, M. A., Owano, T. G., Gicquel, A., Duten, X. 2000; 20 (1): 1-12

    View details for Web of Science ID 000086551300001

  • Raman scattering measurements of molecular hydrogen in a low-density, arc-heated plasma APPLIED PHYSICS B-LASERS AND OPTICS Beattie, D. R., Cappelli, M. A. 2000; 70 (3): 419-427

    View details for Web of Science ID 000088307800016

  • A low-power, linear-geometry Hall plasma source with an open electron-drift PLASMA SOURCES SCIENCE & TECHNOLOGY Schmidt, D. P., Meezan, N. B., Hargus, W. A., Cappelli, M. A. 2000; 9 (1): 68-76

    View details for Web of Science ID 000085585100011

  • Vacuum emission and breakdown characteristics of a planar He-Xe microdischarge APPLIED PHYSICS LETTERS Postel, O. B., Cappelli, M. A. 2000; 76 (5): 544-546

    View details for Web of Science ID 000084938700008

  • Model predictions versus experiments: CH3 radical density profiles in diamond deposition microwave plasma reactor DIAMOND MATERIALS VI Gicquel, A., Hassouni, K., Owano, T., Duten, X., Cappelli, M. 2000; 99 (32): 41-52

    View details for Web of Science ID 000089239900005

  • Characterization and dielectric properties of fluorinated amorphous carbon measured by capacitance-voltage response and spectroscopic ellipsometry AMORPHOUS AND NANOSTRUCTURED CARBON Glew, A. D., Cappelli, M. A. 2000; 593: 341-346

    View details for Web of Science ID 000089239300053

  • Ion energy and momentum flux dependence of diamond-like carbon film synthesis in radio frequency discharges SURFACE & COATINGS TECHNOLOGY Glew, A. D., Saha, R., Kim, J. S., Cappelli, M. A. 1999; 114 (2-3): 224-229

    View details for Web of Science ID 000080808500015

  • Coherent structures in crossed-field closed-drift Hall discharges IEEE TRANSACTIONS ON PLASMA SCIENCE Cappelli, M. A., Hargus, W. A., Meezan, N. B. 1999; 27 (1): 96-97

    View details for Web of Science ID 000080369700047

  • In situ plasma analysis, fluorine incorporation, thermostability, stress, and hardness comparison of fluorinated amorphous carbon and hydrogenated amorphous carbon thin films deposited on Si by plasma enhanced chemical vapor deposition LOW-DIELECTRIC CONSTANT MATERIALS V Glew, A. D., Cappelli, M. A., Touzelbaev, M. N., Hu, Y. 1999; 565: 285-290

    View details for Web of Science ID 000085482500035

  • The structure of an expanding hydrogen arcjet plasma PHYSICS OF PLASMAS Hargus, W. A., Cappelli, M. A. 1998; 5 (12): 4488-4497

    View details for Web of Science ID 000077031000047

  • Competing surface oxidation reactions during diamond synthesis in low pressure flames JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS Kim, J. S., Cappelli, M. A. 1998; 37 (11): 6223-6228

    View details for Web of Science ID 000077648000079

  • Temperature measurements in low-pressure, diamond-forming, premixed flames JOURNAL OF APPLIED PHYSICS Kim, J. S., Cappelli, M. A. 1998; 84 (8): 4595-4602

    View details for Web of Science ID 000076185100083

  • Arcjet nozzle flow-field characterization by laser-induced fluorescence APPLIED OPTICS Storm, P. V., Cappelli, M. A. 1998; 37 (3): 486-495

    Abstract

    Laser-induced fluorescence of the Balmer-alpha (H(alpha)) transition of atomic hydrogen was performed within the nozzle of a 1-kW class radiatively cooled arcjet thruster operating on hydrogen and synthesized-hydrazine propellants. Axial velocities were determined from the Doppler shift of the H(alpha) line center relative to a stationary reference, whereas translational temperatures and electron number densities were determined from a line-shape analysis of the H(alpha) transition. The results are compared with a numerical model and indicate excellent agreement with the velocities, as well as temperatures near the nozzle exit. There are discrepancies, however, in the temperatures far upstream of the exit and in the electron densities, suggesting needed improvements in the modeling of the recombination chemistry.

    View details for Web of Science ID 000071501400013

    View details for PubMedID 18268611

  • Near-edge X-ray absorption fine structure spectroscopy of arcjet-deposited cubic boron nitride DIAMOND AND RELATED MATERIALS BERNS, D. H., Cappelli, M. A., Shuh, D. K. 1997; 6 (12): 1883-1886

    View details for Web of Science ID A1997YG13600021

  • Laser-induced fluorescence study of a xenon Hall thruster APPLIED PHYSICS B-LASERS AND OPTICS Cedolin, R. J., Hargus, W. A., Storm, P. V., Hanson, R. K., Cappelli, M. A. 1997; 65 (4-5): 459-469

    View details for Web of Science ID A1997YA61300005

  • Low energy ion impact-enhanced growth of cubic boron nitride in a supersonic nitrogen/argon plasma flow JOURNAL OF MATERIALS RESEARCH BERNS, D. H., Cappelli, M. A. 1997; 12 (8): 2014-2026

    View details for Web of Science ID A1997XQ27800009

  • Arcjet plasma enhanced vapor phase epitaxy of GaN MATERIALS LETTERS Cappelli, M. A., Kull, A. E., Schwendner, K., LEE, H., Harris, S. J., MROCZKOWSKI, J. 1997; 31 (3-6): 161-164

    View details for Web of Science ID A1997XF56700001

  • CH3 detection in a low-density supersonic arcjet plasma during diamond synthesis APPLIED PHYSICS LETTERS Loh, M. H., Cappelli, M. A. 1997; 70 (8): 1052-1054

    View details for Web of Science ID A1997WJ62600046

  • Radiative emission analysis of an expanding hydrogen arc plasma .1. Arc region diagnostics through axial emission JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Storm, P. V., Cappelli, M. A. 1996; 56 (6): 901-918

    View details for Web of Science ID A1996WA55600008

  • Radiative emission analysis of an expanding hydrogen arc plasma .2. Plume region diagnostics through radial emission JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Storm, P. V., Cappelli, M. A. 1996; 56 (6): 919-932

    View details for Web of Science ID A1996WA55600009

  • Interior plasma diagnostics of arcjet thrusters JOURNAL OF PROPULSION AND POWER Cappelli, M. A., Storm, P. V. 1996; 12 (6): 1070-1076

    View details for Web of Science ID A1996VT42600010

  • Stark broadening corrections to laser-induced fluorescence temperature measurements in a hydrogen arcjet plume APPLIED OPTICS Storm, P. V., Cappelli, M. A. 1996; 35 (24): 4913-4918

    Abstract

    Laser-induced fluorescence of the H(?) transition of atomic hydrogen has previously been performed in the plume of a hydrogen arcjet thruster. Measurements of plasma velocity and temperature, based on the Doppler shift and broadening of the H(?) line shape, were previously published [Appl. Opt. 32, 6117 (1993)]. In that paper the Stark broadening of the H(?) transition was estimated from static-ion calculations performed in the early 1970's and found to be negligible in comparison with the Doppler broadening. However, more recent dynamic-ion calculations have shown the Stark broadening to be considerably larger than was previously assumed, resulting in inaccurate temperature measurements. We present a reanalysis of the fluorescence data, taking into account the improved Stark broadening calculations. The correct atomic hydrogen translation temperature and electron number density are obtained from the Doppler and Stark broadening components of the measured line shape. The results indicate a substantial drop in temperature from those previously reported.

    View details for Web of Science ID A1996VC32000030

    View details for PubMedID 21102917

  • Laser-induced fluorescence measurements of resonance broadening in xenon PHYSICAL REVIEW A Cedolin, R. J., Hanson, R. K., Cappelli, M. A. 1996; 54 (1): 335-342

    View details for Web of Science ID A1996UX03400038

  • Cubic boron nitride synthesis in low-density supersonic plasma flows APPLIED PHYSICS LETTERS BERNS, D. H., Cappelli, M. A. 1996; 68 (19): 2711-2713

    View details for Web of Science ID A1996UJ08900037

  • Fluorescence velocity measurements in the interior of a hydrogen arcjet nozzle AIAA JOURNAL Storm, P. V., Cappelli, M. A. 1996; 34 (4): 853-855

    View details for Web of Science ID A1996UC61100031

  • DIAMOND FILM SYNTHESIS IN LOW-PRESSURE PREMIXED METHANE-OXYGEN FLAMES APPLIED PHYSICS LETTERS Kim, J. S., Cappelli, M. A. 1995; 67 (8): 1081-1083

    View details for Web of Science ID A1995RQ00200013

  • AN EXPERIMENTAL-STUDY OF THE TEMPERATURE AND STOICHIOMETRY DEPENDENCE OF DIAMOND GROWTH IN LOW-PRESSURE FLAT FLAMES JOURNAL OF MATERIALS RESEARCH Kim, J. S., Cappelli, M. A. 1995; 10 (1): 149-157

    View details for Web of Science ID A1995PY82100021

  • NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF LOW-DENSITY SUPERSONIC JETS OF HYDROGEN JOURNAL OF FLUID MECHANICS Boyd, I. D., Beattie, D. R., Cappelli, M. A. 1994; 280: 41-67

    View details for Web of Science ID A1994QA08600002

  • DIAMOND FILM GROWTH IN LOW-PRESSURE PREMIXED ETHYLENE-OXYGEN FLAMES APPLIED PHYSICS LETTERS Kim, J. S., Cappelli, M. A. 1994; 65 (22): 2786-2788

    View details for Web of Science ID A1994PU40400010

  • 2ND-ORDER RAMAN-SCATTERING IN DIAMOND UP TO 1900 K PHYSICAL REVIEW B HERCHEN, H., Cappelli, M. A. 1994; 49 (5): 3213-3216

    View details for Web of Science ID A1994MW34900029

  • A MULTI-FLUID STAGNATION-FLOW PLASMA MODEL WITH SELF-CONSISTENT TREATMENT OF THE COLLISIONAL SHEATH IEEE TRANSACTIONS ON PLASMA SCIENCE Meeks, E., Cappelli, M. A. 1993; 21 (6): 768-777

    View details for Web of Science ID A1993MQ94100019

  • LASER-INDUCED FLUORESCENCE DIAGNOSTIC FOR TEMPERATURE AND VELOCITY-MEASUREMENTS IN A HYDROGEN ARCJET PLUME APPLIED OPTICS LIEBESKIND, J. G., Hanson, R. K., Cappelli, M. A. 1993; 32 (30): 6117-6127

    Abstract

    A diagnostic has been developed to measure velocity and translational temperature in the plume of a 1-kW-class arcjet thruster operating on hydrogen. Laser-induced fluorescence with a narrow-band cw laser is used to probe the Balmer ? transition of excited atomic hydrogen. The velocity is determined from the Doppler shift of the fluorescence excitation spectrum, whereas the temperature is inferred from the lineshape. Analysis shows that although Doppler broadening is the only significant broadening mechanism, the fine structure of the transition must be taken into account. Near the exit plane, axial velocities vary from 4 to 14 km/s, radial velocities vary from 0 to 4 km/s, and swirl velocities are shown to be relatively small. Temperatures from 1000 to 5000 K indicate high dissociation fractions.

    View details for Web of Science ID A1993MC05300035

    View details for PubMedID 20856439

  • TEMPERATURE-DEPENDENCE OF THE CUBIC BORON-NITRIDE RAMAN LINES PHYSICAL REVIEW B HERCHEN, H., Cappelli, M. A. 1993; 47 (21): 14193-14199

    View details for Web of Science ID A1993LF72900029

  • 2 PRECURSOR MODEL FOR LOW-PRESSURE CHEMICAL-VAPOR-DEPOSITION OF SILICON DIOXIDE FROM TETRAETHYLORTHOSILICATE JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B ISLAMRAJA, M. M., Chang, C., McVittie, J. P., Cappelli, M. A., Saraswat, K. C. 1993; 11 (3): 720-726

    View details for Web of Science ID A1993LH22800029

  • 2-TEMPERATURE FLUID MODEL FOR HIGH-PRESSURE PLASMAS IN CONTACT WITH COOLED ELECTRODES JOURNAL OF APPLIED PHYSICS Meeks, E., Cappelli, M. A. 1993; 73 (7): 3172-3182

    View details for Web of Science ID A1993KV03100009

  • THE NONEQUILIBRIUM REGION OF AN ELECTRODE IN CONTACT WITH A FLOWING THERMAL PLASMA IEEE TRANSACTIONS ON PLASMA SCIENCE Cappelli, M. A. 1993; 21 (1): 194-201

    View details for Web of Science ID A1993LD70900027

  • A MODEL OF DIAMOND GROWTH IN LOW-PRESSURE PREMIXED FLAMES JOURNAL OF APPLIED PHYSICS Kim, J. S., Cappelli, M. A. 1992; 72 (11): 5461-5466

    View details for Web of Science ID A1992KA93200066

  • DEVELOPMENT OF DESIGN RULES FOR RELIABLE TUNGSTEN PLUGS USING SIMULATIONS 30TH ANNUAL PROCEEDINGS : RELIABILITY PHYSICS 1992 ISLAMRAJA, M. M., BARIYA, A. J., Saraswat, K. C., Cappelli, M. A., McVittie, J. P., MOBERLY, L., LAHRI, R. 1992: 8-10

    View details for Web of Science ID A1992BW01T00003

  • A 3-DIMENSIONAL MODEL FOR LOW-PRESSURE CHEMICAL-VAPOR-DEPOSITION STEP COVERAGE IN TRENCHES AND CIRCULAR VIAS JOURNAL OF APPLIED PHYSICS ISLAMRAJA, M. M., Cappelli, M. A., McVittie, J. P., Saraswat, K. C. 1991; 70 (11): 7137-7140

    View details for Web of Science ID A1991GU04900074

  • 1ST-ORDER RAMAN-SPECTRUM OF DIAMOND AT HIGH-TEMPERATURES PHYSICAL REVIEW B HERCHEN, H., Cappelli, M. A. 1991; 43 (14): 11740-11744

    View details for Web of Science ID A1991FM46300021

  • HIGH-TEMPERATURE RAMAN-SCATTERING BEHAVIOR IN DIAMOND DIAMOND OPTICS IV HERCHEN, H., Cappelli, M. A. 1991; 1534: 158-168

    View details for Web of Science ID A1991BU90M00015

  • DIAMOND SYNTHESIS IN A 50 KW INDUCTIVELY COUPLED ATMOSPHERIC-PRESSURE PLASMA TORCH PLASMA PROCESSING AND SYNTHESIS OF MATERIALS III Owano, T. G., Kruger, C. H., Cappelli, M. A. 1991; 190: 131-136

    View details for Web of Science ID A1991BT70A00020

  • DIAMOND SYNTHESIS IN A 50-KW INDUCTIVELY COUPLED ATMOSPHERIC-PRESSURE PLASMA TORCH NEW DIAMOND SCIENCE AND TECHNOLOGY Owano, T. G., Goodwin, D. G., Kruger, C. H., Cappelli, M. A. 1991: 497-502

    View details for Web of Science ID A1991BU83N00072

  • ON THE DEVELOPMENT OF INSITU RAMAN ANALYSIS FOR PLASMA DEPOSITED DIAMOND NEW DIAMOND SCIENCE AND TECHNOLOGY Cappelli, M. A., HERCHEN, H. 1991: 225-231

    View details for Web of Science ID A1991BU83N00031

  • HIGH GROWTH-RATE DIAMOND SYNTHESIS IN A LARGE AREA ATMOSPHERIC-PRESSURE INDUCTIVELY COUPLED PLASMA JOURNAL OF MATERIALS RESEARCH Cappelli, M. A., Owano, T. G., Kruger, C. H. 1990; 5 (11): 2326-2333

    View details for Web of Science ID A1990EH57600008

  • LASER-INDUCED FLUORESCENCE IMAGING OF LASER-ABLATED BARIUM APPLIED PHYSICS LETTERS Cappelli, M. A., Paul, P. H., Hanson, R. K. 1990; 56 (18): 1715-1718

    View details for Web of Science ID A1990DB07100001

  • AN INVESTIGATION OF DIAMOND FILM DEPOSITION IN A PREMIXED OXYACETYLENE FLAME JOURNAL OF APPLIED PHYSICS Cappelli, M. A., Paul, P. H. 1990; 67 (5): 2596-2602

    View details for Web of Science ID A1990CR96900062

  • ELECTRON-DENSITY RADIAL PROFILES DERIVED FROM STARK-BROADENING IN A SODIUM PLASMA PRODUCED BY LASER RESONANCE SATURATION APPLIED OPTICS Cappelli, M. A., Measures, R. M. 1987; 26 (6): 1058-1067

    Abstract

    The first free electron density radial profiles of a sodium plasma created by laser resonance saturation are reported. The measurements were based on Stark broadening, of the 4(2)D-3(2)P multiplet and reveal the formation of a conically shaped plasma along the path of the laser pulse, which can be attributed to strong absorption of the laser pulse along the ionization path.

    View details for Web of Science ID A1987G929900019

    View details for PubMedID 20454270

  • SODIUM ATOM DISTRIBUTION WITHIN A HEAT SANDWICH OVEN REVIEW OF SCIENTIFIC INSTRUMENTS Cappelli, M. A., CARDINAL, P. G., HERCHEN, H., Measures, R. M. 1985; 56 (11): 2030-2034

    View details for Web of Science ID A1985ATS8900006

  • 2-CHANNEL TECHNIQUE FOR STARK MEASUREMENTS OF ELECTRON-DENSITY WITHIN A LASER-PRODUCED SODIUM PLASMA APPLIED OPTICS Cappelli, M. A., Measures, R. M. 1984; 23 (13): 2107-2114

    View details for Web of Science ID A1984SY73300020

    View details for PubMedID 18212956

Conference Proceedings

  • Magnetized microdischarge plasma generation at low pressure Ito, T., Kobayashi, K., Hamaguchi, S., Cappelli, M. A. ELSEVIER SCIENCE SA. 2008: 6668-6672

    View details for DOI 10.1016/j.tsf.2007.11.040

    View details for Web of Science ID 000257977900024

  • GaN film growth by a supersonic arcjet plasma Cappelli, M. A., Kull, A. E., Schwendner, K., LEE, H., Harris, S. J., MROCZKOWSKI, J. MATERIALS RESEARCH SOCIETY. 1996: 359-364

    View details for Web of Science ID A1996BG72B00055

  • Diamond film synthesis in low pressure premixed flames of different fuel types Kim, J. S., Cappelli, M. A. ELSEVIER SCIENCE SA. 1995: 791-796

    View details for Web of Science ID A1995TM18000062

  • IN-SITU MASS SAMPLING DURING SUPERSONIC ARCJET SYNTHESIS OF DIAMOND Cappelli, M. A., Loh, M. H. ELSEVIER SCIENCE SA. 1994: 417-421

    View details for Web of Science ID A1994NN16000022

  • SUPERSONIC DC-ARCJET SYNTHESIS OF DIAMOND Loh, M. H., Cappelli, M. A. ELSEVIER SCIENCE SA. 1993: 454-461

    View details for Web of Science ID A1993LE62000071

  • DIAMOND SYNTHESIS IN SUPERSONIC DIRECT-CURRENT ARCJET PLASMA AT SUBTORR PRESSURES Loh, M. H., Cappelli, M. A. ELSEVIER SCIENCE SA. 1992: 408-413

    View details for Web of Science ID A1992KA63900011

  • 1ST-ORDER RAMAN-SCATTERING IN HOMOEPITAXIAL CHEMICAL VAPOR-DEPOSITED DIAMOND AT ELEVATED-TEMPERATURES HERCHEN, H., Cappelli, M. A., LANDSTRASS, M. I., Plano, M. A., Moyer, M. D. ELSEVIER SCIENCE SA. 1992: 206-215

    View details for Web of Science ID A1992HW79400032

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