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

Majeski, Stephen; Yoo, Jongsoo ; Zweben, Stewart ; Yamada, Masaaki
Issue date: 2018
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Majeski, Stephen, Yoo, Jongsoo, Zweben, Stewart, & Yamada, Masaaki. (2018). Detection of an electron beam in a high density plasma via an electrostatic probe [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Majeski, Stephen and
                Yoo, Jongsoo and
                Zweben, Stewart and
                Yamada, Masaaki},
  title       = {{Detection of an electron beam in a high
                density plasma via an electrostatic prob
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2018,
  url         = {}

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.

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