Increased Upstream Ionization Due to Spontaneous Formation of a Double Layer in an Expanding Plasma
|
|
- Ariel Howard
- 5 years ago
- Views:
Transcription
1 Increased Upstream Ionization Due to Spontaneous Formation of a Double Layer in an Expanding Plasma Earl E. Scime* November, 2009 APS Division of Plasma Physics Meeting * with Costel Biloiu, Ioana Biloiu, Rod Boswell, Jerry Carr, Saikat Chakraborty Thakur, Christine Charles, Sam Cohen, Justin Ellis, Matt Galante, Alex Hansen, Zane Harvey, Saeid Houshmandyar, Amy Keesee, Dustin McCarren, Albert Meige, Steve Przybysz, Stephanie Sears, and Xuan Sun
2 HIGHLIGHTS Double layers form spontaneously in expanding, low pressure, high density plasmas Double layers require some tens of milliseconds to form in a pulsed discharge Under carefully controlled conditions, a theoretical model which argues that double layers form as a means of adjusting for differing upstream and downstream diffusive loss rates has been verified Strong double layer formation suppressed by growth of beam driven instabilities in pulsed plasmas.
3 OUTLINE Double layer fundamentals Spontaneous double layer discovery and comparison to Monte Carlo particle-in-cell model Tomographic and time-resolved double layer LIF measurements Helicon antenna frequency threshold for double layer formation and relation to model predictions Evidence for beam driven instability suppression of double layer for low antenna frequencies
4 GEOMETRY OF A STATIC DOUBLE LAYER (DL) Scale length ~ 10 s of Debye lengths (shielding distances) quasi-neutrality is violated! accelerated ions L.P. Block, Astrophysics and Space Science (1978)
5 DOUBLE LAYER CREATION IN LABORATORY EXPERIMENTS By mixing two different plasmas together Triple plasma device (magnetic field free) Current driven plasmas Q-Machines, ion beams into target plasmas, currents induced during reconnection Leading edge of a pulsed plasma Pulsed cathodes, pulsed electron beams Expanding, current-free plasmas with strong density gradient due to magnetic field expansion or gettering of electrons (l mfp > density gradient scale length) Chi-Kung, MNX, HELIX, ECR sources Sheath forms due to potential difference Current or instability driven Expansion speed exceeds sound speed Formation mechanism upstream ionization balance [Lieberman et al., 2006], sheath instability [Chen, 2006], boundary conditions [Meige et al., 2007]?
6 Plasma Potential PLASMA VELOCITY DISTRIBUTIONS INDICATE PRESENCE OF DL B ions electrons accelerated electrons ions electrons (V e > V te so current or beam required) weak double layer e 2-5kT e grounded chamber wall A trapped and a passing or beam electron (ion) population appear upstream (downstream) of the double layer. Typically an electron beam or drift is required to maintain the static, field aligned potential drop. However, current free double layers have been found localized to regions of strong magnetic field gradients [Hatakeyama et al., 1983]. Lieberman s recent current-free model argues for a 5 th, reflected electron, species.
7 EXAMPLE OF MAGNETOSPHERIC DL TRAPPED AND PASSING IONS Accelerated ions Sheath Aurora: FAST measurements C. Cattell et al., J. Geophys. Res. 107, 1238 (2002). Trapped ions Ion flux integrated over all pitch angles versus time for an earthward flowing ion beam.
8 Plasma potential (V) HISTORY: CHARLES AND BOSWELL [APL, 2003] - DOUBLE LAYER POTENTIAL STRUCTURE AND ION BEAM IN EXPANDING HELICON SOURCE PLASMA Beam V ~ 2C s DV p double layer from RFEA probe
9 ION BEAMS OBSERVED VIA PARALLEL LASER INDUCED FLUORESCENCE IN MNX [PHYS. PLASMAS, 2003] Background ions Ion beam ~ 9 km/s LIF nm 4s 4 P 3/2 4p 4 D 5/ nm 3d 4 F 7/2 Energy Analyzer When (RFEA) Zeeman shift in weakening field balances Doppler shift of accelerating ions, measured state asymmetry gives absolute measure of ion collisionality mean free path ~ gradient scale length
10 MONTE-CARLO -PIC SIMULATION SUGGESTS DENSITY GRADIENT TRIGGERS DL FORMATION Common geometry for all helicon source experiments reporting DLs A spatially dependent loss rate models the divergent magnetic field [Meige et al. Phys. Plasmas (2005)]. DL spontaneously forms when the loss rate exceeds a critical value.
11 IN MC-PIC, ION BEAM FORMS AT EXPANSION POINT, TWO ION POPULATIONS DOWNSTREAM OF DL sheath beam ~ 5 km/s double layer Joint ANU-France Monte Carlo, particle-in-cell simulation
12 FULL DL STRUCTURE, INCLUDING LONG PRE-SHEATH REGION, MEASURED IN HELIX. EXCELLENT AGREEMENT WITH MC-PIC MODEL [Sun et al., PRL 2005] The plasma potential measurements are consistent with the LIF ion energy measurements. The plasma potential tracks the magnetic field strength - decreasing along z. The pre-sheath and sheath are clearly visible and large enough for detailed study. pre-sheath sheath
13 f(v) IONS ACCELERATED TO ~ 10 KM/S DOWNSTREAM OF DL weak double layer as E Beam ~ 3kT e Ion Velocity (m/s) Position (cm)
14 LIF TOMOGRAPHIC STUDIES IDENTIFY MIRROR RATIO THRESHOLD FOR DL FORMATION
15 OPEN QUESTIONS Phenomenon could be used for plasma propulsion (ion beams without grids, filaments, etc.) - do double layers form in pulsed, expanding helicon discharges? Clear low pressure threshold for double layer formation - what is the physical mechanism? Can any strength double layer be created, or is there a limit? Do different mass ions fall through the double layer at the same speed or at the same energy? Does the ion beam detach from the magnetic nozzle?
16 TIME RESOLVED LIF DEVELOPED TO INVESTIGATE DL FORMATION PHASE ANU experiments indicate some DL formation within 100 ms (RFEA measurements difficult to quantify). Stenzel experiments in supersonically expanding plasmas indicate DL forms within a few ms (just an ambipolar field effect?). In HELIX, the DL forms within a few ms, but ion beam energy continues to increase until ~ 100 ms into discharge pulse. This measurement is in the DL and once the DL forms, the background ions are unable to reach the measurement location - so only one population is observed. ion beam Ion Velocity (arb)
17 THE DL TYPICALLY REQUIRES 10 S OF MS NO SHORT PULSE ROCKETS? More detailed study with 1 ms time resolution: the LIF-determined argon ion velocity distribution function during a 100 ms plasma pulse surface plot showing fast (~ 7.1 km/s) and a slow (~ 0.4 km/s) ion populations.
18 BEAM DELAY DEPENDS ON DEAD TIME, I.E., PERSISTENCE
19 WHY DOES THE DL FORM? + a fifth species, electrons reflected from the boundaries on the upstream end walls. This balances the current through the DL.
20 LIEBERMAN AND CHARLES MODEL Because the upstream radius is smaller than the downstream radius, an additional source of upstream ionization is required at low pressures, which is supplied by the accelerated group of electrons 1 8eTe V T nupstream ( ne nebeame ) e 4v m thi V T DL e floating wall e And upstream density decreases if DL vanishes
21 RF THRESHOLD FOR DL FORMATION SERENDIPITOUSLY DISCOVERED beam appears for f > 11.5 MHz LIF measurements of the downstream IVDF versus antenna frequency obtained 124 cm downstream of the rf antenna The reference iodine spectrum is also shown.
22 STRAGGLING IONS APPEAR UPSTREAM FOR F < 11.5 MHZ ion acceleration into sheath incomplete for f < 11.5 MHz LIF measurements of the upstream IVDF versus antenna frequency obtained 95 cm downstream of the rf antenna (on upstream side of DL). The reference iodine spectrum is also shown. Note, antenna frequency axis reversed.
23 COINCIDENT WITH DL APPEARANCE, UPSTREAM DENSITY INCREASES DISCONTINUOUSLY beam appears for f > 11.5 MHz Upstream (squares) and downstream (circles) density versus rf frequency. The error bars are smaller than the size of the data points.
24 COINCIDENT WITH DL APPEARANCE, INTENSE ELECTROSTATIC NOISE VANISHES Upstream (squares) and downstream (circles) noise-to-signal ratio versus antenna frequency
25 ELECTROSTATIC NOISE AND BEAM APPEARANCE EVIDENT IN DOWNSTREAM RETARDING FIELD ENERGY ANALYZER MEASUREMENTS AS WELL electrostatic noise appears beam appears for f > 11.5 MHz
26 ELECTROSTATIC NOISE CONSISTS OF WELL-DEFINED HARMONICS OF AN ION-ACOUSTIC-LIKE WAVE C s = 6.4 km/sec. For the 17.5 khz wave V phase = 7 ± 1 km/sec
27 ION FLOW MEASUREMENTS CONSISTENT WITH BEAM DRIVEN INSTABILITY THAT SUPPRESSES DL FORMATION Beam current too large, upstream ion acceleration in pre-sheath decreases, beam vanishes, noise appears, and upstream density drops C s Upstream (squares) and downstream (circles) ion beam velocity versus antenna frequency. DL gets stronger and stronger as frequency decreases (beam energy increases) and then DL abruptly collapses.
28 COMBINED PULSED AND ANTENNA FREQUENCY STUDIES TO EXPLORE BEAM FORMATION PHASE Background Beam Moderate mirror ratio of 30 case persistent ion beam Wave amplitude
29 CLEAR CORRELATION WITH FASTER & MORE INTENSE BEAM AND APPEARANCE OF INSTABILITY ~7.2km/s 8 km/s Faster, Mirror Large mirror ratio more of ratio, intense 30, no large waves beam waves before waves appear
30 LARGE MIRROR RATIO CASE SMALL MIRROR RATIO CASE beam-wave anti -correlation
31 HIGHLIGHTS Double layers form spontaneously in expanding, low pressure, high density plasmas Double layers require some tens of milliseconds to form in a pulsed discharge unless plasma from previous pulse persists The theoretical prediction of increased upstream ionization due to double layers has been verified in an expanding helicon plasma Stronger double layers with larger beam/background density ratios result in excitation of beam-driven ion acoustic instability which suppresses double layer formation ( threshold ~ 1/Vw p ) Ions in the pre-sheath of the double layers accelerate to a common, bulk, sound speed and pressure threshold difference for beams in argon and xenon plasmas reproduced in PIC model
32 THE PRE-SHEATH AND SHEATH REGIONS OF THESE DLS ARE ACCESSIBLE WHAT HAPPENS IN A MULTI-ION SHEATH QUESTION? For a single ion sheath, energy and particle conservation (cold ions) : n n x o u i o 2 e( x) 1 2 Mu Assuming Boltzmann electrons: Solution of Poisson s equation, demands Bohm sheath criterion ( ), is ion speed at sheath edge ( e kt ) e n ( x) n e e o 2 d e( n n ), u > kt M (sound speed) o 2 e i o e dx But Reimann s generalized Bohm criterion for multi-ion pre-sheaths has two interesting solutions for low temperature plasmas: o Case 1: Each species is lost to the sheath at its own Bohm velocity V s T Case 2: All species lost to the sheath at a common velocity e j 2 C s V C s sj m is j n n e0
33 Background XE BEAM AT VERY LOW PRESSURE, BUT NO XE BEAM AT HIGHER PRESSURES FOR WHICH AR BEAM STILL OBSERVED When the ad hoc expansion parameter in the PIC code is set very high, there are beams for high pressure Xe as well as low pressure Xe and Ar. Contrary to experimental results. By reducing the expansion parameter, we achieve a situation more like what is observed experimentally. Unimodal Distribution Beam In the high pressure Xe case the beam and the background coalesce into a more or less unimodal structure. Beam
34 SCALING OF THE PIC CODE XE VELOCITY IN MIXED AR-XE PLASMAS AS FUNCTION OF AR FRACTION CONSISTENT WITH MEASUREMENTS Experimental Data I. Bilou, Ph.D. Dissertation, WVU (2009) Qualitative agreement between the experimentally measured scaling of the Xe velocity with argon fraction and the PIC code.
ion flows and temperatures in a helicon plasma source
Time-resolved, laser-inducedfluorescence measurements of ion flows and temperatures in a helicon plasma source Earl E. Scime* June, 2010 International Conference on Spectral Line Shapes * Ioana Biloiu,
More informationPressure dependence of an ion beam accelerating structure in an expanding helicon plasma
Pressure dependence of an ion beam accelerating structure in an expanding helicon plasma Xiao Zhang, Evan Aguirre, Derek S. Thompson, John McKee, Miguel Henriquez, and Earl E. Scime Citation: Physics of
More informationParticle-In-Cell Simulations of a Current-Free Double Layer
Particle-In-Cell Simulations of a Current-Free Double Layer S. D. Baalrud 1, T. Lafleur, C. Charles and R. W. Boswell American Physical Society Division of Plasma Physics Meeting November 10, 2010 1Present
More informationElectron Energy Distributions in a Radiofrequency Plasma. Expanded by Permanent Magnets
J. Plasma Fusion Res. SERIES, Vol. 9 (21) Electron Energy Distributions in a Radiofrequency Plasma Expanded by Permanent Magnets Tomoyo SASAKI, Kazunori TAKAHASHI, and Tamiya FUJIWARA Department of Electrical
More informationBeams and magnetized plasmas
Beams and magnetized plasmas 1 Jean-Pierre BOEUF LAboratoire PLAsma et Conversion d Energie LAPLACE/ CNRS, Université Paul SABATIER, TOULOUSE Beams and magnetized plasmas 2 Outline Ion acceleration and
More informationExperimental investigation of double layers in expanding plasmas
PHYSICS OF PLASMAS 14, 013506 2007 Experimental investigation of double layers in expanding plasmas N. Plihon, a P. Chabert, and C. S. Corr Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique,
More informationExperiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer
PHYSICS OF PLASMAS 13, 122101 2006 Experiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer A. Aanesland, a M. A. Lieberman,
More informationOne-dimensional particle-in-cell simulation of a current-free double layer in an expanding plasma
One-dimensional particle-in-cell simulation of a current-free double layer in an expanding plasma Albert Meige, Rod W. Boswell, Christine Charles, and Miles M. Turner Citation: Physics of Plasmas (1994-present)
More informationLaser Induced Fluorescence Studies of Electrostatic Double Layers in an Expanding Helicon Plasma
Laser Induced Fluorescence Studies of Electrostatic Double Layers in an Expanding Helicon Plasma Jerry Carr Jr. Dissertation submitted to the College of Arts and Sciences at West Virginia University in
More informationPHYSICS Computational Plasma Physics
PHYSICS 78 - Computational Plasma Physics INSTRUCTOR Dr. Earl Scime (escime@wvu.edu) 93-34, ext. 1437 Office hours: MW :30 3:30 and whenever door is open Rm 18 & 05 Hodges Hall Class: MWF 1:30-:0 Rm 334
More information2D OOPIC Simulations of the Helicon Double Layer
2D OOPIC Simulations of the Helicon Double Layer IEPC-2007-146 Presented at the 30 th International Electric Propulsion Conference, Florence, Italy I. Musso * Center for Studies and Activities for Space,
More informationDiffusion during Plasma Formation
Chapter 6 Diffusion during Plasma Formation Interesting processes occur in the plasma formation stage of the Basil discharge. This early stage has particular interest because the highest plasma densities
More informationExperimental Studies of Helicon Double Layers for Future High Power Plasma Propulsion
AIAA 26-4844 Experimental Studies of Helicon Double Layers for Future High Power Plasma Propulsion Roger Walker * ESA-ESTEC, Keplerlaan 1, 221 AZ Noordwijk, The Netherlands Nicolas Plihon, Pascal Chabert,
More informationEffect of Exhaust Magnetic Field in a Helicon Double-Layer Thruster Operating in Xenon Christine Charles and Rod W. Boswell
IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 36, NO. 5, OCTOBER 2008 2141 Effect of Exhaust Magnetic Field in a Helicon Double-Layer Thruster Operating in Xenon Christine Charles and Rod W. Boswell Abstract
More informationHelicon Plasma Thruster Experiment Controlling Cross-Field Diffusion within a Magnetic Nozzle
Helicon Plasma Thruster Experiment Controlling Cross-Field Diffusion within a Magnetic Nozzle IEPC-2013-163 Presented at the 33rd International Electric Propulsion Conference, The George Washington University
More informationContents: 1) IEC and Helicon 2) What is HIIPER? 3) Analysis of Helicon 4) Coupling of the Helicon and the IEC 5) Conclusions 6) Acknowledgments
Contents: 1) IEC and Helicon 2) What is HIIPER? 3) Analysis of Helicon 4) Coupling of the Helicon and the IEC 5) Conclusions 6) Acknowledgments IEC:! IEC at UIUC modified into a space thruster.! IEC has
More informationImprovement of Propulsion Performance by Gas Injection and External Magnetic Field in Electrodeless Plasma Thrusters
Improvement of Propulsion Performance by Gas Injection and External Magnetic Field in Electrodeless Plasma Thrusters IEPC-217-249 Presented at the th International Electric Propulsion Conference Georgia
More informationLaboratory evidence of a supersonic ion beam generated by a current-free helicon double-layer
PHYSICS OF PLASMAS VOLUME 11, NUMBER 4 APRIL 2004 Laboratory evidence of a supersonic ion beam generated by a current-free helicon double-layer C. Charles a) and R. W. Boswell Plasma Research Laboratory,
More informationADVENTURES IN TWO-DIMENSIONAL PARTICLE-IN-CELL SIMULATIONS OF ELECTRONEGATIVE DISCHARGES
ADVENTURES IN TWO-DIMENSIONAL PARTICLE-IN-CELL SIMULATIONS OF ELECTRONEGATIVE DISCHARGES PART 1: DOUBLE LAYERS IN A TWO REGION DISCHARGE E. Kawamura, A.J. Lichtenberg, M.A. Lieberman and J.P. Verboncoeur
More informationSheaths: More complicated than you think a
PHYSICS OF PLASMAS 12, 055502 2005 Sheaths: More complicated than you think a Noah Hershkowitz b University of Wisconsin-Madison, Madison, Wisconsin 53706 Received 7 December 2004; accepted 7 February
More informationarxiv: v1 [physics.plasm-ph] 23 May 2015
Experimental investigation of double layers in expanding plasmas N. Plihon, P. Chabert, and C. S. Corr Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, 91128, Palaiseau Cedex, France
More informationarxiv: v1 [physics.plasm-ph] 10 Nov 2014
arxiv:1411.2464v1 [physics.plasm-ph] 10 Nov 2014 Effects of fast atoms and energy-dependent secondary electron emission yields in PIC/MCC simulations of capacitively coupled plasmas A. Derzsi 1, I. Korolov
More informationUnderstanding Plasmas through Ion Velocity Distribution Function measurements
Understanding Plasmas through Ion Velocity Distribution Function measurements Saikat Chakraborty Thakur Dissertation submitted to the College of Arts and Sciences at West Virginia University in partial
More informationLow Temperature Plasma Technology Laboratory
Low Temperature Plasma Technology Laboratory Equilibrium theory for plasma discharges of finite length Francis F. Chen and Davide Curreli LTP-6 June, Electrical Engineering Department Los Angeles, California
More informationPlasma Astrophysics Chapter 1: Basic Concepts of Plasma. Yosuke Mizuno Institute of Astronomy National Tsing-Hua University
Plasma Astrophysics Chapter 1: Basic Concepts of Plasma Yosuke Mizuno Institute of Astronomy National Tsing-Hua University What is a Plasma? A plasma is a quasi-neutral gas consisting of positive and negative
More informationModeling and Simulation of Plasma Based Applications in the Microwave and RF Frequency Range
Modeling and Simulation of Plasma Based Applications in the Microwave and RF Frequency Range Dr.-Ing. Frank H. Scharf CST of America What is a plasma? What is a plasma? Often referred to as The fourth
More informationNumerical simulation of the Helicon Double Layer Thruster Concept
1/93 ESA STUDY TECNICAL FINAL REP ORT Concept Final Report Numerical simulation of the Helicon Double Layer Thruster Concept ESA Contract No. Prepared by: Marco Manente, Ivano Musso, Johan Carlsson Contributions
More informationA theory for formation of a low pressure, current-free double layer
INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF PHYSICS D: APPLIED PHYSICS J. Phys. D: Appl. Phys. 39 (6) 394 334 doi:.88/-377/39/5/ A theory for formation of a low pressure, current-free double layer M A Lieberman,
More informationPropagating double layers in electronegative plasmas
PHYSICS OF PLASMAS 14, 053508 2007 Propagating double layers in electronegative plasmas A. Meige a Laboratoire Plasma et Conversion d Energie (LAPLACE), Université Paul Sabatier, 118 route de Narbonne,
More informationPlasma parameter evolution in a periodically pulsed ICP
Plasma parameter evolution in a periodically pulsed ICP V. Godyak and B. Alexandrovich OSRAM SYLVANIA, 71 Cherry Hill Drive, Beverly, MA 01915, USA The electron energy probability function (EEPF) has been
More informationExperimental Investigations of Magnetic Reconnection. J Egedal. MIT, PSFC, Cambridge, MA
Experimental Investigations of Magnetic Reconnection J Egedal MIT, PSFC, Cambridge, MA Coronal Mass Ejections Movie from NASA s Solar Dynamics Observatory (SDO) Space Weather The Solar Wind affects the
More informationWhat happens to ions at the plasma boundary in multiple-ion species plasmas?
What happens to ions at the plasma boundary in multiple-ion species plasmas? How diode lasers help illumine the problem of sheath formation Greg Severn Plasma Theory and Simulation Group Seminar, University
More informationLow Temperature Plasma Technology Laboratory
Low Temperature Plasma Technology Laboratory CENTRAL PEAKING OF MAGNETIZED GAS DISCHARGES Francis F. Chen and Davide Curreli LTP-1210 Oct. 2012 Electrical Engineering Department Los Angeles, California
More informationSpatial Profile of Ion Velocity Distribution Function in Helicon High-Density Plasma by Laser Induced Fluorescence Method
Trans. JSASS Aerospace Tech. Japan Vol. 14, No. ists3, pp. Pb_7-Pb_12, 216 Spatial Profile of Ion Velocity Distribution Function in Helicon High-Density Plasma by Laser Induced Fluorescence Method By Yuriko
More informationNumerical Study of Power Deposition, Transport and Acceleration Phenomena in Helicon Plasma Thrusters
Numerical Study of Power Deposition, Transport and Acceleration Phenomena in Helicon Plasma Thrusters M. Magarotto, M. Manente, P. de Calro, F. Trezzolani, D. Pavarin, and D. Melazzi CISAS, Padova, Italy
More informationPlasmas rf haute densité Pascal Chabert LPTP, Ecole Polytechnique
Plasmas rf haute densité Pascal Chabert LPTP, Ecole Polytechnique chabert@lptp.polytechnique.fr Pascal Chabert, 2006, All rights reserved Programme Introduction Généralité sur les plasmas Plasmas Capacitifs
More informationFundamentals of Plasma Physics
Fundamentals of Plasma Physics Definition of Plasma: A gas with an ionized fraction (n i + + e ). Depending on density, E and B fields, there can be many regimes. Collisions and the Mean Free Path (mfp)
More informationMAGNETIC NOZZLE PLASMA EXHAUST SIMULATION FOR THE VASIMR ADVANCED PROPULSION CONCEPT
MAGNETIC NOZZLE PLASMA EXHAUST SIMULATION FOR THE VASIMR ADVANCED PROPULSION CONCEPT ABSTRACT A. G. Tarditi and J. V. Shebalin Advanced Space Propulsion Laboratory NASA Johnson Space Center Houston, TX
More informationLecture 2. Introduction to plasma physics. Dr. Ashutosh Sharma
Preparation of the concerned sectors for educational and R&D activities related to the Hungarian ELI project Ion acceleration in plasmas Lecture 2. Introduction to plasma physics Dr. Ashutosh Sharma Zoltán
More informationPLASMA ADIABATICITY IN A DIVERGING MAGNETIC NOZZLE
PLASMA ADIABATICITY IN A DIVERGING MAGNETIC NOZZLE J. P. Sheehan and Benjamin W. Longmier University of Michigan Edgar A. Bering University of Houston Christopher S. Olsen, Jared P. Squire, Mark D. Carter,
More informationExperimental verification of Boltzmann equilibrium for negative ions in weakly collisional electronegative plasmas
1 Experimental verification of Boltzmann equilibrium for negative ions in weakly collisional electronegative plasmas arxiv:1203.5515v1 [physics.plasm-ph] 25 Mar 2012 Young-chul Ghim 1 and Noah Hershkowitz
More informationThe low-field density peak in helicon discharges
PHYSICS OF PLASMAS VOLUME 10, NUMBER 6 JUNE 2003 Francis F. Chen a) Electrical Engineering Department, University of California, Los Angeles, Los Angeles, California 90095-1597 Received 10 December 2002;
More informationModelling of magnetic nozzle thrusters with application to ECR and Helicon thrusters
Modelling of magnetic nozzle thrusters with application to ECR and Helicon thrusters IEPC--994/ISTS--b-994 Presented at Joint Conference of 3th International Symposium on Space Technology and Science,
More informationPRINCIPLES OF PLASMA DISCHARGES AND MATERIALS PROCESSING
PRINCIPLES OF PLASMA DISCHARGES AND MATERIALS PROCESSING Second Edition MICHAEL A. LIEBERMAN ALLAN J, LICHTENBERG WILEY- INTERSCIENCE A JOHN WILEY & SONS, INC PUBLICATION CONTENTS PREFACE xrrii PREFACE
More informationMODELING AND SIMULATION OF LOW TEMPERATURE PLASMA DISCHARGES
MODELING AND SIMULATION OF LOW TEMPERATURE PLASMA DISCHARGES Michael A. Lieberman University of California, Berkeley lieber@eecs.berkeley.edu DOE Center on Annual Meeting May 2015 Download this talk: http://www.eecs.berkeley.edu/~lieber
More informationLarge Plasma Device (LAPD)
Large Plasma Device (LAPD) Over 450 Access ports Computer Controlled Data Acquisition Microwave Interferometers Laser Induced Fluorescence DC Magnetic Field: 0.05-4 kg, variable on axis Highly Ionized
More informationMODELING OF AN ECR SOURCE FOR MATERIALS PROCESSING USING A TWO DIMENSIONAL HYBRID PLASMA EQUIPMENT MODEL. Ron L. Kinder and Mark J.
TECHCON 98 Las Vegas, Nevada September 9-11, 1998 MODELING OF AN ECR SOURCE FOR MATERIALS PROCESSING USING A TWO DIMENSIONAL HYBRID PLASMA EQUIPMENT MODEL Ron L. Kinder and Mark J. Kushner Department of
More informationA Kinetic Theory of Planar Plasma Sheaths Surrounding Electron Emitting Surfaces
A Kinetic Theory of Planar Plasma Sheaths Surrounding Electron Emitting Surfaces J. P. Sheehan1, I. Kaganovich2, E. Barnat3, B. Weatherford3, H. Wang2, 4 1 2 D. Sydorenko, N. Hershkowitz, and Y. Raitses
More informationModélisation de sources plasma froid magnétisé
Modélisation de sources plasma froid magnétisé Gerjan Hagelaar Groupe de Recherche Energétique, Plasma & Hors Equilibre (GREPHE) Laboratoire Plasma et Conversion d Énergie (LAPLACE) Université Paul Sabatier,
More informationEarl E Scime, Paul A Keiter, Michael W Zintl, Matthew M Balkey, John L Kline and Mark E Koepke
Plasma Sources Sci. Technol. 7 (1998) 186-191. Printed in the UK PII: 50963-0252(98)92978-4 Earl E Scime, Paul A Keiter, Michael W Zintl, Matthew M Balkey, John L Kline and Mark E Koepke Department of
More informationNonlinear processes associated with Alfvén waves in a laboratory plasma
Nonlinear processes associated with Alfvén waves in a laboratory plasma Troy Carter Dept. Physics and Astronomy and Center for Multiscale Plasma Dynamics, UCLA acknowledgements: Brian Brugman, David Auerbach,
More informationTurbulence and flow in the Large Plasma Device
Turbulence and flow in the Large Plasma Device D.A. Schaffner, T.A. Carter, P. Popovich, B. Friedman Dept of Physics, UCLA Gyrokinetics in Laboratory and Astrophysical Plasmas Isaac Newton Institute of
More informationCluster fusion in a high magnetic field
Santa Fe July 28, 2009 Cluster fusion in a high magnetic field Roger Bengtson, Boris Breizman Institute for Fusion Studies, Fusion Research Center The University of Texas at Austin In collaboration with:
More informationMONTE CARLO SIMULATION OF RADIATION TRAPPING IN ELECTRODELESS LAMPS: A STUDY OF COLLISIONAL BROADENERS*
MONTE CARLO SIMULATION OF RADIATION TRAPPING IN ELECTRODELESS LAMPS: A STUDY OF COLLISIONAL BROADENERS* Kapil Rajaraman** and Mark J. Kushner*** **Department of Physics ***Department of Electrical and
More information4 Modeling of a capacitive RF discharge
4 Modeling of a capacitive discharge 4.1 PIC MCC model for capacitive discharge Capacitive radio frequency () discharges are very popular, both in laboratory research for the production of low-temperature
More informationHelicon Double Layer Thruster Performance Enhancement via Manipulation of Magnetic Topology
Helicon Double Layer Thruster Performance Enhancement via Manipulation of Magnetic Topology IEPC--97 Presented at the nd International Electric Propulsion Conference, Wiesbaden, Germany S. J. Pottinger,
More informationKINETIC DESCRIPTION OF MAGNETIZED TECHNOLOGICAL PLASMAS
KINETIC DESCRIPTION OF MAGNETIZED TECHNOLOGICAL PLASMAS Ralf Peter Brinkmann, Dennis Krüger Fakultät für Elektrotechnik und Informationstechnik Lehrstuhl für Theoretische Elektrotechnik Magnetized low
More informationLimits on the Efficiency of a Helicon Plasma Thruster
Limits on the Efficiency of a Helicon Plasma Thruster IEPC-05-84 Presented at Joint Conference of 0th International Symposium on Space Technology and Science 4th International Electric Propulsion Conference
More informationSpace Plasma Physics Thomas Wiegelmann, 2012
Space Plasma Physics Thomas Wiegelmann, 2012 1. Basic Plasma Physics concepts 2. Overview about solar system plasmas Plasma Models 3. Single particle motion, Test particle model 4. Statistic description
More informationNonlinear Diffusion in Magnetized Discharges. Francis F. Chen. Electrical Engineering Department
Nonlinear Diffusion in Magnetized Discharges Francis F. Chen Electrical Engineering Department PPG-1579 January, 1998 Revised April, 1998 Nonlinear Diffusion in Magnetized Discharges Francis F. Chen Electrical
More informationDevelopment of a Hall Thruster Fully Kinetic Simulation Model Using Artificial Electron Mass
Development of a Hall Thruster Fully Kinetic Simulation Model Using Artificial Electron Mass IEPC-013-178 Presented at the 33rd International Electric Propulsion Conference, The George Washington University
More informationTime-Synchronized Laser Induced Fluorescence Techniques for the Study of Quasi-Periodic Xenon Plasma Phenomena
Time-Synchronized Laser Induced Fluorescence Techniques for the Study of Quasi-Periodic Xenon Plasma Phenomena IEPC-2015-349/ISTS-2015-b-349 Presented at Joint Conference of 30th International Symposium
More informationCharacteristics and classification of plasmas
Characteristics and classification of plasmas PlasTEP trainings course and Summer school 2011 Warsaw/Szczecin Indrek Jõgi, University of Tartu Partfinanced by the European Union (European Regional Development
More informationFINAL REPORT. DOE Grant DE-FG03-87ER13727
FINAL REPORT DOE Grant DE-FG03-87ER13727 Dynamics of Electronegative Plasmas for Materials Processing Allan J. Lichtenberg and Michael A. Lieberman Department of Electrical Engineering and Computer Sciences
More informationLow Temperature Plasma Technology Laboratory
Low Temperature Plasma Technology Laboratory Instability Driven Radial Transport in a Helicon Plasma Max Light, Francis F. Chen, and Pat Colestock LTP-11 January, 21 Electrical Engineering Department Los
More informationGeneration and Acceleration of High-Density Helicon Plasma Using Permanent Magnets for the Completely Electrodeless Propulsion System )
Generation and Acceleration of High-Density Helicon Plasma Using Permanent Magnets for the Completely Electrodeless Propulsion System ) Shuhei OTSUKA, Toshiki NAKAGAWA, Hiroki ISHII, Naoto TESHIGAHARA,
More informationEquilibrium model for two low-pressure electronegative plasmas connected by a double layer
PHYSICS OF PLASMAS 13, 093504 2006 Equilibrium model for two low-pressure electronegative plasmas connected by a double layer P. Chabert, a N. Plihon, C. S. Corr, and J.-L. Raimbault Laboratoire de Physique
More informationA note on the plasma sheath and the Bohm Criterion
A note on the plasma sheath and the Bohm Criterion G.D. Severn Dept. of Physics, University of San Diego, San Diego CA 92110 (Dated: April 6, 2006) PACS numbers: 52.27.Aj, 52.27.Cm The word sheath in connection
More informationCharacterization of Ion Cyclotron Resonance Acceleration for Electric Propulsion with Interferometry
JOURNAL OF PROPULSION AND POWER Vol. 27, No. 2, March April 2011 Characterization of Ion Cyclotron Resonance Acceleration for Electric Propulsion with Interferometry Christopher Davis ElectroDynamic Applications,
More informationPlasma-neutrals transport modeling of the ORNL plasma-materials test stand target cell
Plasma-neutrals transport modeling of the ORNL plasma-materials test stand target cell J.M. Canik, L.W. Owen, Y.K.M. Peng, J. Rapp, R.H. Goulding Oak Ridge National Laboratory ORNL is developing a helicon-based
More informationPIC-MCC/Fluid Hybrid Model for Low Pressure Capacitively Coupled O 2 Plasma
PIC-MCC/Fluid Hybrid Model for Low Pressure Capacitively Coupled O 2 Plasma Kallol Bera a, Shahid Rauf a and Ken Collins a a Applied Materials, Inc. 974 E. Arques Ave., M/S 81517, Sunnyvale, CA 9485, USA
More informationEFFICIENT PLASMA PRODUCTION IN LOW BACKGROUND NEUTRAL PRESSURES WITH THE M2P2 PROTOTYPE
EFFICIENT PLASMA PRODUCTION IN LOW BACKGROUND NEUTRAL PRESSURES WITH THE M2P2 PROTOTYPE T. Ziemba *, P. Euripides, R. Winglee, J. Slough, L. Giersch ** University of Washington, Seattle, WA ABSTRACT Mini-Magnetospheric
More informationIon heating in the HELIX helicon plasma source
PHYSICS OF PLASMAS VOLUME 6, NUMBER 1 DECEMBER 1999 Ion heating in the HELIX helicon plasma source J. L. Kline, E. E. Scime, P. A. Keiter, M. M. Balkey, and R. F. Boivin Department of Physics, West Virginia
More informationDepartment of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, USA
1 MAGNETIZED DIRECT CURRENT MICRODISCHARGE, I: EFFECT OF THE GAS PRESSURE Dmitry Levko and Laxminarayan L. Raja Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at
More informationElectric Propulsion. An short introduction to plasma and ion spacecraft propulsion. S. Barral. Instytut Podstawowych Problemów Techniki - PAN
Electric Propulsion An short introduction to plasma and ion spacecraft propulsion S. Barral Instytut Podstawowych Problemów Techniki - PAN sbarral@ippt.gov.pl S. Barral (IPPT-PAN) Electric Propulsion 1
More informationCharacteristics of Positive Ions in the Sheath Region of Magnetized Collisional Electronegative Discharges
Plasma Science and Technology, Vol.6, No.6, Jun. 204 Characteristics of Positive Ions in the Sheath Region of Magnetized Collisional Electronegative Discharges M. M. HATAMI, A. R. NIKNAM 2 Physics Department
More informationBeta-dependent upper bound on ion temperature anisotropy in a laboratory plasma
PHYSICS OF PLASMAS VOLUME 7, NUMBER 3 MARCH 2000 LETTERS The purpose of this Letters section is to provide rapid dissemination of important new results in the fields regularly covered by Physics of Plasmas.
More informationObservation of Neo-Classical Ion Pinch in the Electric Tokamak*
1 EX/P6-29 Observation of Neo-Classical Ion Pinch in the Electric Tokamak* R. J. Taylor, T. A. Carter, J.-L. Gauvreau, P.-A. Gourdain, A. Grossman, D. J. LaFonteese, D. C. Pace, L. W. Schmitz, A. E. White,
More informationElectrostatic Interchange Instabilities of a Rotating, High-Temperature Plasma Confined by a Dipole Magnet: Experiment and Theory
Electrostatic Interchange Instabilities of a Rotating, High-Temperature Plasma Confined by a Dipole Magnet: Experiment and Theory Mike Mauel Columbia University, New York, NY mailto: mauel@columbia.edu
More informationA review of plasma thruster work at the Australian National University
A review of plasma thruster work at the Australian National University IEPC-2015-90850 Presented at Joint Conference of 30th International Symposium on Space Technology and Science 34th International Electric
More informationTwo-dimensional Particle-In-Cell model of the extraction region of the PEGASES ion-ion plasma source
Two-dimensional Particle-In-Cell model of the extraction region of the PEGASES ion-ion plasma source IEPC-2013-249 Presented at the 33rdInternational Electric Propulsion Conference, The George Washington
More information1D simulations of the Helicon Double Layer
1D simulations of the Helicon Double Layer IEPC-2007-106 Presented at the 30 th International Electric Propulsion Conference, Florence, Italy Marco Manente CISAS University of Padua, Padova Italy Johan
More informationConfinement of toroidal non-neutral plasma
10th International Workshop on Non-neutral Plasmas 28 August 2012, Greifswald, Germany 1/20 Confinement of toroidal non-neutral plasma in magnetic dipole RT-1: Magnetospheric plasma experiment Visualized
More informationLaser matter interaction
Laser matter interaction PH413 Lasers & Photonics Lecture 26 Why study laser matter interaction? Fundamental physics Chemical analysis Material processing Biomedical applications Deposition of novel structures
More informationMeasuring velocity of ion acoustic waves through plasma Hannah Saddler, Adam Egbert, and Warren Mardoum
Measuring velocity of ion acoustic waves through plasma Hannah Saddler, Adam Egbert, and Warren Mardoum (Dated: 11 December 2015) This experiment aimed to measure velocity of ion acoustic waves propagating
More informationHong Young Chang Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
Hong Young Chang Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea Index 1. Introduction 2. Some plasma sources 3. Related issues 4. Summary -2 Why is
More informationPIC-MCC/Fluid Hybrid Model for Low Pressure Capacitively Coupled O 2 Plasma
PIC-MCC/Fluid Hybrid Model for Low Pressure Capacitively Coupled O 2 Plasma Kallol Bera a, Shahid Rauf a and Ken Collins a a Applied Materials, Inc. 974 E. Arques Ave., M/S 81517, Sunnyvale, CA 9485, USA
More informationKinetic Simulations of Ion Beam Neutralization
Kinetic Simulations of Ion Beam Neutralization O. Chang and J. Wang Astronautical Engineering Department University of Southern California Los Angeles, CA 90089-1192, USA Abstract. Full particle PIC simulations
More informationPreparation of the concerned sectors for educational and R&D activities related to the Hungarian ELI project
Preparation of the concerned sectors for educational and R&D activities related to the Hungarian ELI project Ion acceleration in plasmas Lecture 10. Collisionless shock wave acceleration in plasmas pas
More informationKinetic Theory of Instability-Enhanced Collisions and Its Application to Langmuir s Paradox and the Multi-Species Bohm Criterion
Kinetic Theory of Instability-Enhanced Collisions and Its Application to Langmuir s Paradox and the Multi-Species Bohm Criterion Scott D. Baalrud in collaboration with Chris C. Hegna and James D. Callen
More informationFigure 1.1: Ionization and Recombination
Chapter 1 Introduction 1.1 What is a Plasma? 1.1.1 An ionized gas A plasma is a gas in which an important fraction of the atoms is ionized, so that the electrons and ions are separately free. When does
More informationActive and Fast Particle Driven Alfvén Eigenmodes in Alcator C-Mod
Active and Fast Particle Driven Alfvén Eigenmodes in Alcator C-Mod JUST DID IT. J A Snipes, N Basse, C Boswell, E Edlund, A Fasoli #, N N Gorelenkov, R S Granetz, L Lin, Y Lin, R Parker, M Porkolab, J
More informationPhysics and Modelling of a Negative Ion Source Prototype for the ITER Neutral Beam Injection
1 ITR/P1-37 Physics and Modelling of a Negative Ion Source Prototype for the ITER Neutral Beam Injection J.P. Boeuf a, G. Fubiani a, G. Hagelaar a, N. Kohen a, L. Pitchford a, P. Sarrailh a, and A. Simonin
More informationPlasma ionization through wave-particle interaction in a capacitively coupled radiofrequency
Plasma ionization through wave-particle interaction in a capacitively coupled radiofrequency discharge D. O Connell, T. Gans, D. Vender, U. Czarnetzki, and R. Boswell Citation: Physics of Plasmas (1994-present)
More informationAn advanced simulation code for Hall effect thrusters
An advanced simulation code for Hall effect thrusters P. Fajardo, M. Merino, E. Ahedo pablo.fajardo@uc3m.es EPIC Workshop October 2017, Madrid Contents Plasmas and Space propulsion Team (EP2-UC3M) CHEOPS
More informationLinear and Nonlinear Dust Acoustic Waves, Shocks and Stationary Structures in DC-Glow-Discharge Dusty Plasma Experiments.
53rd Annual Meeting of the APS Division of Plasma Physics BI2.00005 Monday November 14, 2011 Linear and Nonlinear Dust Acoustic Waves, Shocks and Stationary Structures in DC-Glow-Discharge Dusty Plasma
More informationAtmospheric escape. Volatile species on the terrestrial planets
Atmospheric escape MAVEN s Ultraviolet Views of Hydrogen s Escape from Mars Atomic hydrogen scattering sunlight in the upper atmosphere of Mars, as seen by the Imaging Ultraviolet Spectrograph on NASA's
More informationExperiments with a Supported Dipole
Experiments with a Supported Dipole Reporting Measurements of the Interchange Instability Excited by Electron Pressure and Centrifugal Force Introduction Ben Levitt and Dmitry Maslovsky Collisionless Terrella
More informationVolume Production of D - Negative Ions in Low-Pressure D 2 Plasmas - Negative Ion Densities versus Plasma Parameters -
Volume Production of D - Negative Ions in Low-Pressure D 2 Plasmas - Negative Ion Densities versus Plasma Parameters - Osamu Fukumasa and Shigefumi Mori Department of Electrical and Electronic Engineering,
More informationPlasma Energy Conversion in the Expanding Magnetic Nozzle
Plasma Energy Conversion in the Expanding Magnetic Nozzle IEPC-2015-355/ISTS-2015-b-355 Presented at Joint Conference of 30th International Symposium on Space Technology and Science 34th International
More information