Investigation on the electron flux to the wall in the VENUS ion source

Thuillier, T.; Angot, J.; Benitez, J. Y.; Hodgkinson, A.; Lyneis, C. M.; Todd, D. S.; Xie, D. Z.

doi:10.1063/1.4935989

Title: Investigation on the electron flux to the wall in the VENUS ion source

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4935989· OSTI ID:1456932

Thuillier, T. ^[1]; Angot, J. ^[1]; Benitez, J. Y. ^[2]; Hodgkinson, A. ^[2]; Lyneis, C. M. ^[2]; Todd, D. S. ^[2]; Xie, D. Z. ^[2]

Univ. of Grenoble-Alpes, CNRS/IN2P3 (France). Lab. of Subatomic Physics and Cosmology (LPSC)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division

The long-term operation of high charge state electron cyclotron resonance ion sources fed with high microwave power has caused damage to the plasma chamber wall in several laboratories. Porosity, or a small hole, can be progressively created in the chamber wall which can destroy the plasma chamber over a few year time scale. Here, a burnout of the VENUS plasma chamber is investigated in which the hole formation in relation to the local hot electron power density is studied. First, the results of a simple model assuming that hot electrons are fully magnetized and strictly following magnetic field lines are presented. The model qualitatively reproduces the experimental traces left by the plasma on the wall. However, it is too crude to reproduce the localized electron power density for creating a hole in the chamber wall. Second, the results of a Monte Carlo simulation, following a population of scattering hot electrons, indicate a localized high power deposited to the chamber wall consistent with the hole formation process. Finally, a hypervapotron cooling scheme is proposed to mitigate the hole formation in electron cyclotron resonance plasma chamber wall.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1456932

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 2; Related Information: © 2015 AIP Publishing LLC.; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 7 works

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References (10)

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Cited By (1)

Experimental evidence on microwave induced electron losses from ECRIS plasma Sakildien, M.; Tarvainen, O.; Kronholm, R. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5029443	journal	June 2018

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Related Subjects

47 OTHER INSTRUMENTATION
42 ENGINEERING
Monte Carlo methods
electrodes
hot carriers
ion sources
plasma collisions
Venus
plasma temperature
electron scattering
magnetic fields
particle scattering