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Title: Detection of an electron beam in a high density plasma via an electrostatic probe

Abstract

An electron beam is detected by a 1D floating potential probe array in a relatively high density (10e12 - 10e13 cm-3) and low temperature (~ 5 eV) plasma of the Magnetic Reconnection Experiment (MRX). Clear perturbations in the floating potential profile by the electron beam are observed. Based on the floating potential profile and a current balance equation to the probe array tips, the effective width of the electron beam is determined, from which we determine the radial and toroidal beam current density profiles. After the profile of the electron beam is specified from the measured beam current, we demonstrate the consistency of the current balance equation and the location of the perturbation is also in agreement with field line mapping. No significant broadening of the electron beam is observed after the beam propagates for tens of centimeters through the high density plasma. These results prove that the field line mapping is, in principle, possible in high density plasmas.

Creator(s)/Author(s):
; ; ;
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
U. S. Department of Energy
Keywords:
field line mapping
OSTI Identifier:
1562008
DOI:
10.11578/1562008

Citation Formats

Majeski, Stephen, Yoo, Jongsoo, Zweben, Stewart, and Yamada, Masaaki. Detection of an electron beam in a high density plasma via an electrostatic probe. United States: N. p., 2018. Web. doi:10.11578/1562008.
Majeski, Stephen, Yoo, Jongsoo, Zweben, Stewart, & Yamada, Masaaki. Detection of an electron beam in a high density plasma via an electrostatic probe. United States. doi:10.11578/1562008.
Majeski, Stephen, Yoo, Jongsoo, Zweben, Stewart, and Yamada, Masaaki. 2018. "Detection of an electron beam in a high density plasma via an electrostatic probe". United States. doi:10.11578/1562008. https://www.osti.gov/servlets/purl/1562008. Pub date:Mon Jan 01 00:00:00 EST 2018
@article{osti_1562008,
title = {Detection of an electron beam in a high density plasma via an electrostatic probe},
author = {Majeski, Stephen and Yoo, Jongsoo and Zweben, Stewart and Yamada, Masaaki},
abstractNote = {An electron beam is detected by a 1D floating potential probe array in a relatively high density (10e12 - 10e13 cm-3) and low temperature (~ 5 eV) plasma of the Magnetic Reconnection Experiment (MRX). Clear perturbations in the floating potential profile by the electron beam are observed. Based on the floating potential profile and a current balance equation to the probe array tips, the effective width of the electron beam is determined, from which we determine the radial and toroidal beam current density profiles. After the profile of the electron beam is specified from the measured beam current, we demonstrate the consistency of the current balance equation and the location of the perturbation is also in agreement with field line mapping. No significant broadening of the electron beam is observed after the beam propagates for tens of centimeters through the high density plasma. These results prove that the field line mapping is, in principle, possible in high density plasmas.},
doi = {10.11578/1562008},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}

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