Dynamics of ion beam charge neutralization by ferroelectric plasma sources

Stepanov, Anton D.; Gilson, Erik P.; Grisham, Larry R.; Kaganovich, Igor D.; Davidson, Ronald C.

doi:10.1063/1.4947562

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

Journal Article · Wed Apr 27 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4947562· OSTI ID:1259598

Stepanov, Anton D. ^[1]; Gilson, Erik P. ^[1]; Grisham, Larry R. ^[1]; Kaganovich, Igor D. ^[1];

^[1]

Princeton Univ., Princeton, NJ (United States)

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⁺ 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 15V 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 similar to –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-mu s 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 mu s after the high voltage pulse is applied. Lastly, 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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC0209CH11466

OSTI ID:: 1259598

Alternate ID(s):: OSTI ID: 1249621

Journal Information:: Physics of Plasmas, Vol. 23, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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References (21)

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Cited By (3)

Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma Tokluoglu, Erinc K.; Kaganovich, Igor D.; Carlsson, Johan A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5038878	journal	May 2018
Electrostatic solitary waves in ion beam neutralization Lan, C.; Kaganovich, I. D. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5093760	journal	May 2019
Amplification due to Two-Stream Instability of Self-Electric and Magnetic Fields of an Ion Beam Propagating in Background Plasma Tokluoglu, Erinc K.; Kaganovich, Igor D.; Carlsson, Johan A. arXiv https://doi.org/10.48550/arxiv.1711.09951	text	January 2017

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