Colorado State University
Electric Propulsion & Plasma Engineering
Prof. John D. Williams, Director
Phone: (970)491-8564
Fax: (970)491-8671
Email: john.d.williams@colostate.edu

2009

31st International Electric Propulsion Conference

  • IEPC-2009_016 Farnell - Comparison of Hollow Cathode Discharge Plasma Configurations
  • IEPC-2009_026 Rubin - Hollow Cathode Discharge Initiation and Fast Starting Cathode
  • IEPC-2009_031 Farnell - Remote Diagnostic Measurements of Hall Thruster Plumes
  • IEPC-2009_042 Rubin - Total and Differential Sputter Yields of Boron Nitride Measured by Quartz Crystal Microbalance

Journal

  • B Rubin, C Farnell, J Williams, J Vaughn, T Schneider, and D Ferguson, "Magnetic filter type plasma source for ground-based simulation of low earth orbit environment", Plasma Sources Science and Technology, vol.18, 025015, 2009.

Colorado State University

  • Thesis Russell H. Martin, Characterization of Hollow Cathodes Using A Fast Actuating Electrostatic Probe, Colorado State University

Laser Plasma Diagnostics Laboratory

  • Conference
    • N. Yamamoto, L. Tao, Y. Arakawa,M. Oya, H. Nakashima, A.P. Yalin 2009 “Lifetime estimation in a Hall thruster using continuous-wave cavity ring-down spectroscopy” 49th Propulsion Conference, The Japanese society for aeronautical and space science (Japanese Proceedings)
    • N. Yamamoto, L. Tao, A. P.Yalin, 2009 “Development of Real-time Erosion Monitoring System for Hall Thrusters by Cavity Ring-Down Spectroscopy” Submitted to 27th Int. Symposium on Space Technology and Science, Japan
    • A.P. Yalin, B. Rubin, J. Topper, C. Farnell, 2009 “Differential Sputter Yield Measurements of Single- and Multi-Element Targets due to Ion Beam Bombardment”, Accepted to 2009 Society of Vacuum Coaters TechCon, Santa Clara, CA, USA
    • A.P. Yalin, L. Tao, N. Yamamoto, 2009 “Laser-Based Sensor for Real Time Sputter Monitoring and End Point Detection in Ion Beam Etch Systems”, Accepted to 2009 Society of Vacuum Coaters TechCon, Santa Clara, CA, USA

2008

  • B. Rubin and J.D. Williams, "Hollow Cathode Conditioning and Discharge Initiation," J. of Applied Physics, V. 104, No. 5, Article Number: 053302, Sept. 1, 2008.
  • H.A. Fujii, T. Watanabe, , H. Kojima, K.I. Oyama, T. Kusagayac, Y. Yamagiwa, H. Ohtsu, M. Cho, S. Sasaki, K. Tanaka, J.D. Williams, et al "Sounding Rocket Experiment of Bare Electrodynamic Tether System," Acta Astronautica, 2008, doi:10.1016/j.actaastro
  • J. Wang, Y. Caoy, R. Kafafy, R.A. Martinez, and J.D. Williams, "Numerical and Experimental Investigations of Cross-Over Ion Impingement for Sub-Scale Ion Optics," J. Propulsion and Power, V. 24, No. 3, May-June 2008, pp. 562-570.

Colorado State University

  • Thesis Justin W. Mauck, Heat Flux to a Wall Immersed in a RF Plasma

Laser Plasma Diagnostics Laboratory

  • Journal
    • S. Joshi, A.P. Yalin, D.B. Olsen, C. Dumitrescu, P.V. Puzinauskas, 2008 “Laser Induced Breakdown Spectroscopy for In-Cylinder Equivalence Ratio Measurements in Laser Ignited Natural Gas Engines” Accepted for publication in Applied Spectroscopy
    • H. El-Rabii, S. Victorov, A.P. Yalin, 2008 “Time-resolved emission spectroscopy of an air plasma generated by UV-nanosecond laser pulses” Accepted for publication in J. Phys. D. Applied Physics
    • L. Tao, N. Yamamoto, A.P. Yalin, 2008 “Cavity Ring-Down Spectroscopy Sensor for Ion Beam Etch Monitoring and End-Point Detection of Multilayer Structures” Review of Scientific Instruments 79 115107
    • A.P. Yalin, S. Joshi, M. DeFoort, B. Willson, 2008 “Towards Multiplexed Fiber Delivered Laser Ignition For Natural Gas Engines”, Technical Brief in ASME Journal of Engineering for Gas Turbines and Power, 130 (4) Article Number: 044502
  • Conference
    • A.P. Yalin et al. 2008, “High-Sensitivity Boron Nitride Sputter Erosion Measurements by Continuous-Wave Cavity Ring-Down Spectroscopy”, 44th AIAA Joint Propulsion Conference, AIAA-2008-5091, Hartford, CT, USA
    • J. Topper, B. Rubin, A.P. Yalin, 2008, “Low Energy Sputter Yields Of Boron Nitride due to Xenon Ion Bombardment”, 44th AIAA Joint Propulsion Conference, AIAA-2008-5092, Hartford, CT, USA
    • N. Yamamoto, A.P. Yalin, L. Tao, T.B. Smith, A.D. Gallimore, Y. Arakawa, 2008, “Development of Real-time Boron Nitride Erosion Monitoring System for Hall Thrusters by Cavity Ring-Down Spectroscopy” 26th Int. Symposium on Space Technology and Science, ISTS 2008-b-21, pp. 254-259 Japan

2007

Journal Publications

  • Wilbur PJ, Wilson M, Hutchings K, Williams JD, "Emissive Membrane Ion Thruster Concept," J. Propulsion and Power, Vol 23, Issue 5, pp. 1049-1054, Sept-Oct 2007.

IEEE Pulsed Power & Plasma Science Conference, Albuquerque, New Mexico

JANNAF, Denver, Colorado

  • J. D. Williams, B. Rubin, and C. C. Farnell JANNAF-2007 Fast Starting Hollow Cathodes for Sounding Rocket-Based Tether Experiments

Colorado State University

  • Dissertation Casey C. Farnell, Plasma Flow Field Measurements Downstream of a Hollow Cathode
  • Dissertation Cody C. Farnell, Performance and Lifetime Simulation of Ion Thruster Optics
  • Dissertation Vijay K. Surla, Cavity Ring Down Spectroscopy: A Method To Measure Sputter Erosion For Electric Propulsion Applications
  • Thesis Kirk A. Zoerb, Differential Sputtering Yields of Refractory Metals by Ion Bombardment At Normal and Oblique Incidences
  • Thesis Rafael A. Martinez, Electric Field Breakdown Properties of Ion Thruster Optics

Laser Plasma Diagnostics Laboratory

  • Journal
    • C. Dumitrescu, P.Puzinauskas, S. Olcmen, S.G. Buckley, S. Joshi, A.P. Yalin, 2007 “Fiber-Optic Spark Delivery for Gas-Phase Laser Induced Breakdown Spectroscopy”, Applied Spectroscopy 61 pp. 1338-1343
    • V. Surla, A.P. Yalin, 2007, “Differential Sputter Yield Measurements using Cavity Ring-Down Spectroscopy”, /Applied Optics/ 46, (19), pp. 3987-3994.
    • S. Joshi, A.P. Yalin, A. Galvanauskas, 2007, “On the Use of Hollow Core Fibers, Fiber Lasers, and Photonic Crystal Fibers for Spark Delivery and Laser Ignition in Gases” /Applied Optics/ 46, (19), pp. 4057-4064
    • A.P. Yalin, J.D. Williams, V. Surla, and K.A. Zoerb, 2007, “Differential Sputter Yield Profiles of Molybdenum due to Bombardment by Low Energy Xenon Ions at Normal and Oblique Incidence,” /Journal of Physics D – Applied Physics/ 40, pp. 3194-3202.
  • Conference
    • S. Joshi, A. Reynolds, B. Willson, A.P. Yalin, 2007, “Multiplexed Fiber Delivered Laser Ignition of Natural Gas Engines” ICE Division – ASME Fall Technical Conference, ICEF 2007-1617, Charleston, SC
    • B. Rubin, A.P. Yalin, 2007, “Total and Differential Sputter Yields Of Boron Nitride measured by Quartz Crystal Microbalance and Weight Loss”, 30th International Electric Propulsion Conference, IEPC-2007-074, Florence, Italy
    • A.P. Yalin, V. Surla, L. Tao, T. Smith, A. Gallimore, 2007, “Boron Nitride Sputter Erosion Measurements by Cavity Ring-Down Spectroscopy”, 30th International Electric Propulsion Conference, IEPC-2007-075, Florence, Italy
    • AIAA-2007-5315 V. Surla, L. Tao, A.P. Yalin, 2007, “Species-Specific Sputtering Measurements with Cavity Ring-Down Spectroscopy”, 43rd AIAA Joint Propulsion Conference, AIAA-2007-5315, Cincinnati, OH, CA
    • AIAA-2007-5314 A.P. Yalin, B. Rubin, S. Domingue, Z. Glueckert, J.D. Williams, 2007, “Differential Sputter Yields Of Boron Nitride, Quartz, and Kapton Due to Low Energy Xe+ Bombardment”, 43rd AIAA Joint Propulsion Conference, AIAA-2007-5314, Cincinnati, OH, CA

2006

42nd JPC, Sacramento, California

  • AIAA-2006-4336 Azimuthal Differential Sputter Yields of Molybdenum by Low Energy Xe+ Bombardment
  • AIAA-2006-4338 Sputtering Studies of Multi-Component Materials by Weight Loss and Cavity Ring-Down Spectroscopy
  • AIAA-2006-4339 Ion and Plasma Thruster Test Console Based on Three-Phase Resonant Conversion Power Modules
  • AIAA-2006-4818 Multi-Axis Plasma Profiling System for Characterization of Plasma Thruster Plumes
  • AIAA-2006-4820 Direct Measurements of Plasma Properties nearby a Hollow Cathode Using a High Speed Electrostatic Probe
  • AIAA-2006-4999 Ion Impingement Limits of Sub-Scale Ion Optics: Comparison of Simulation and Experiment
  • AIAA-2006-5004 Electric Field Breakdown Properties of Materials Used in Ion Optics Systems

2005

JANNAF, Monterey, California

  • JANNAF-2005 Emissive Membrane Ion Thrusters and Their Applications

29th IEPC, Princeton, New Jersey

  • IEPC-2005-095 Ion Thruster Optical Performance Enhancement via Ion-emissive-surface Shaping
  • IEPC-2005-140 Research on Optimization of Onboard Magnetic Diagnostics System of Hall Thruster Plasma
  • IEPC-2005-155 Perveance and Beamlet Expansion Modeling of the NEXT Ion Engine
  • IEPC-2005-164 The Emissive Membrane Ion Thruster Concept
  • IEPC-2005-284 Electric Field Breakdown Characteristics of Carbon-based Ion Optics
  • IEPC-2005-293 Differential Sputtering Yields of Refractory Metals by Xenon, Krypton, and Argon Ion Bombardment at Normal and Oblique Incidences
  • IEPC-2005-294 Direct and Remote Measurements of Plasma Properties nearby Hollow Cathodes

McNair Program

  • McNair-2005 Differential Sputtering of Electric Propulsion Grid Material by Ion Bombardment

Journal Papers - See Additional Publications

  • “Velocity Measurements by Cavity Ring-Down Spectroscopy”, Optics Letters
  • “Use of Hollow Core Fibers to Deliver Nano-second Nd:YAG Laser Pulses for Spark Formation”, Optics Letters
  • “Optical and RF Electrical Characteristics of Atmospheric Pressure Open Air Hollow Slot Microplasmas”, Journal of Physics D: Applied Physics
  • “Detection of Sputtered Metals using Cavity Ring-Down Spectroscopy”, Applied Optics
  • “Radio Frequency Driven Slot Micro-Discharges Operating in Open Air”, IEEE Transactions on Plasma Science

2004

40th JPC, Fort Lauderdale, Florida

  • AIAA-2004-3432 Measurement of Ion Energy Distributions Produced within an NSTAR Discharge Chamber
  • AIAA-2004-3614 Performance Evaluation of 8-cm Diameter Ion Optics Assemblies Fabricated from Carbon-Carbon Composites
  • AIAA-2004-3628 Evaluation of Sub-Scale NEXIS Ion Optics and Strategies for Performing Accelerated Wear Testing
  • AIAA-2004-3788 Differential Sputtering Behavior of Pyrolytic Graphite and Carbon-Carbon Composite Under Xenon Bombardment
  • AIAA-2004-3814 HiPEP Ion Optics System Evaluation Using Gridlets
  • AIAA-2004-3818 Numerical Simulation of HiPEP Ion Optics
  • AIAA-2004-5668 Characterization of a Plasma Source for Ground-Based Simulation of LEO Plasma Conditions

4th International Spacecraft Propulsion Conference, Sardinia, Italy

  • ISPC-2004 Principles of Hall Thruster Onboard Malfunction Diagnostics Based on Magnetic Field Measurements of Plasma Currents

Journal Papers - See Additional Publications

  • “Sputter Erosion Measurements of Titanium and Molybdenum by Cavity Ring-Down Spectroscopy”, Review of Scientific Instruments
  • “Absolute UV and VUV Emission in the 110-400 nm Region from 13.56 MHz Driven Hollow Slot Microplasmas Operating in Open Air”, Plasma Sources Science and Technology
  • “Laser Lineshape Effects on Cavity Enhanced Absorption Spectroscopy Signals”, Applied Physics B - Lasers and Optics

2003

28th IEPC, Toulouse, France

  • IEPC-2003-072 Characteristics of Energetic Ions Emitted from Hollow Cathodes
  • IEPC-2003-073 Numerical Simulation of Ion Thruster Optics
  • IEPC-2003-128 Experimental Performance Limits on High Specific Impulse Ion Optics
  • IEPC-2003-130 Xenon Sputter Yield Measurements For Ion Thruster Materials

39th JPC, Huntsville, Alabama

8th Spacecraft Charging Technology Conference

  • SCTC-2003 Ground-Based Simulation of Low Earth Orbit Plasma Conditions: Plasma Generation and Characterization

Space Technology and Applications International Forum Proceedings

  • STAIF-2003 Large Carbon-Carbon Grids for High Power, High Specific Impulse Ion Thrusters

Journal Papers - See Additional Publications

  • “Electrical and Optical Emission Characteristics of RF Driven Hollow Slot Microplasmas Operating in Open Air” Applied Physics Letters

2001

27th IEPC, Pasadena, California

  • IEPC-2001-098 A Study of High Specific Impulse Ion Thruster Optics
  • IEPC-2001-099 Numerical Simulation of High Specific Impulse Ion Thruster Optics

Additional Publications