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Title: Dynamics of ion beam charge neutralization by ferroelectric plasma sources

Abstract

Ferroelectric Plasma Sources (FEPSs) can generate plasma that provides effective space-charge neutralization of intense high-perveance ion beams, as has been demonstrated on the Neutralized Drift Compression Experiment NDCX-I and NDCX-II. This article presents experimental results on charge neutralization of a high-perveance 38 keV Ar{sup +} beam by a plasma produced in a FEPS discharge. By comparing the measured beam radius with the envelope model for space-charge expansion, it is shown that a charge neutralization fraction of 98% is attainable with sufficiently dense FEPS plasma. The transverse electrostatic potential of the ion beam is reduced from 15 V before neutralization to 0.3 V, implying that the energy of the neutralizing electrons is below 0.3 eV. Measurements of the time-evolution of beam radius show that near-complete charge neutralization is established ∼5 μs after the driving pulse is applied to the FEPS and can last for 35 μs. It is argued that the duration of neutralization is much longer than a reasonable lifetime of the plasma produced in the sub-μs surface discharge. Measurements of current flow in the driving circuit of the FEPS show the existence of electron emission into vacuum, which lasts for tens of μs after the high voltage pulse is applied. It is argued thatmore » the beam is neutralized by the plasma produced by this process and not by a surface discharge plasma that is produced at the instant the high-voltage pulse is applied.« less

Authors:
; ; ; ;  [1]
  1. Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22599153
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON IONS; COMPARATIVE EVALUATIONS; COMPRESSION; ELECTRIC POTENTIAL; ELECTRON EMISSION; ELECTRONS; FERROELECTRIC MATERIALS; ION BEAMS; KEV RANGE 10-100; PLASMA; PULSES; SPACE CHARGE; SURFACES

Citation Formats

Stepanov, Anton D., Gilson, Erik P., Grisham, Larry R., Kaganovich, Igor D., and Davidson, Ronald C. Dynamics of ion beam charge neutralization by ferroelectric plasma sources. United States: N. p., 2016. Web. doi:10.1063/1.4947562.
Stepanov, Anton D., Gilson, Erik P., Grisham, Larry R., Kaganovich, Igor D., & Davidson, Ronald C. Dynamics of ion beam charge neutralization by ferroelectric plasma sources. United States. doi:10.1063/1.4947562.
Stepanov, Anton D., Gilson, Erik P., Grisham, Larry R., Kaganovich, Igor D., and Davidson, Ronald C. Fri . "Dynamics of ion beam charge neutralization by ferroelectric plasma sources". United States. doi:10.1063/1.4947562.
@article{osti_22599153,
title = {Dynamics of ion beam charge neutralization by ferroelectric plasma sources},
author = {Stepanov, Anton D. and Gilson, Erik P. and Grisham, Larry R. and Kaganovich, Igor D. and Davidson, Ronald C.},
abstractNote = {Ferroelectric Plasma Sources (FEPSs) can generate plasma that provides effective space-charge neutralization of intense high-perveance ion beams, as has been demonstrated on the Neutralized Drift Compression Experiment NDCX-I and NDCX-II. This article presents experimental results on charge neutralization of a high-perveance 38 keV Ar{sup +} beam by a plasma produced in a FEPS discharge. By comparing the measured beam radius with the envelope model for space-charge expansion, it is shown that a charge neutralization fraction of 98% is attainable with sufficiently dense FEPS plasma. The transverse electrostatic potential of the ion beam is reduced from 15 V before neutralization to 0.3 V, implying that the energy of the neutralizing electrons is below 0.3 eV. Measurements of the time-evolution of beam radius show that near-complete charge neutralization is established ∼5 μs after the driving pulse is applied to the FEPS and can last for 35 μs. It is argued that the duration of neutralization is much longer than a reasonable lifetime of the plasma produced in the sub-μs surface discharge. Measurements of current flow in the driving circuit of the FEPS show the existence of electron emission into vacuum, which lasts for tens of μs after the high voltage pulse is applied. It is argued that the beam is neutralized by the plasma produced by this process and not by a surface discharge plasma that is produced at the instant the high-voltage pulse is applied.},
doi = {10.1063/1.4947562},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 4,
volume = 23,
place = {United States},
year = {2016},
month = {4}
}

Works referenced in this record:

Long plasma source for heavy ion beam charge neutralization
journal, July 2009

  • Efthimion, Philip C.; Gilson, Erik P.; Grisham, Larry
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 606, Issue 1-2
  • DOI: 10.1016/j.nima.2009.03.096

Progress in beam focusing and compression for warm-dense matter experiments
journal, July 2009

  • Seidl, P. A.; Anders, A.; Bieniosek, F. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 606, Issue 1-2
  • DOI: 10.1016/j.nima.2009.03.254

The NDCX-II engineering design
journal, January 2014

  • Waldron, W. L.; Abraham, W. J.; Arbelaez, D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 733
  • DOI: 10.1016/j.nima.2013.05.063

Ferroelectric plasma sources for NDCX-II and heavy ion drivers
journal, January 2014

  • Gilson, E. P.; Davidson, R. C.; Efthimion, P. C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 733
  • DOI: 10.1016/j.nima.2013.05.091

Effect of emission aperture shape upon ion optics
journal, August 1977

  • Grisham, L. R.; Tsai, C. C.; Whealton, J. H.
  • Review of Scientific Instruments, Vol. 48, Issue 8
  • DOI: 10.1063/1.1135179

Low‐energy ion beam space‐charge neutralization
journal, April 1994

  • Dudin, S. V.; Zykov, A. V.; Farenik, V. I.
  • Review of Scientific Instruments, Vol. 65, Issue 4
  • DOI: 10.1063/1.1144941

Electron emission from ferroelectrics
journal, December 2000

  • Rosenman, G.; Shur, D.; Krasik, Ya. E.
  • Journal of Applied Physics, Vol. 88, Issue 11
  • DOI: 10.1063/1.1319378

Results from a scaled final focus experiment for heavy ion fusion
journal, May 2002

  • MacLaren, S. A.; Faltens, A.; Seidl, P. A.
  • Physics of Plasmas, Vol. 9, Issue 5
  • DOI: 10.1063/1.1464894

High-frequency electron beam modulation by a ferroelectric cathode with anomalous plasma resistance
journal, August 2004

  • Chirko, K.; Gurovich, V. Ts.; Krasik, Ya. E.
  • Physics of Plasmas, Vol. 11, Issue 8
  • DOI: 10.1063/1.1767542

Addressing the plasma formation on the surface of a ferroelectric sample
journal, September 2009

  • Gurovich, V. Tz.; Krasik, Ya. E.; Raichlin, V.
  • Journal of Applied Physics, Vol. 106, Issue 5
  • DOI: 10.1063/1.3211318

Physics of neutralization of intense high-energy ion beam pulses by electrons
journal, May 2010

  • Kaganovich, I. D.; Davidson, R. C.; Dorf, M. A.
  • Physics of Plasmas, Vol. 17, Issue 5
  • DOI: 10.1063/1.3335766

Two‐dimensional particle simulation of plasma expansion between plane parallel electrodes
journal, October 1995

  • Patel, Kartik; Mago, V. K.
  • Journal of Applied Physics, Vol. 78, Issue 7
  • DOI: 10.1063/1.359841