skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

Here, an electron beam is detected by a 1D floating potential probe array in a relatively high density (10 12–10 13 cm -3) and low temperature (~5 eV) plasma of the Magnetic Reconnection Experiment. 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.

Authors:
 [1]; ORCiD logo [2];  [2];  [2]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1440880
Grant/Contract Number:  
AC0209CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 7; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Electron beam detection; floating potential; fi eld line mapping

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:10.1088/1361-6587/aabd0e.
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:10.1088/1361-6587/aabd0e.
Majeski, Stephen, Yoo, Jongsoo, Zweben, Stewart, and Yamada, Masaaki. Tue . "Detection of an electron beam in a high density plasma via an electrostatic probe". United States. doi:10.1088/1361-6587/aabd0e. https://www.osti.gov/servlets/purl/1440880.
@article{osti_1440880,
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 = {Here, an electron beam is detected by a 1D floating potential probe array in a relatively high density (1012–1013 cm-3) and low temperature (~5 eV) plasma of the Magnetic Reconnection Experiment. 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 = {10.1088/1361-6587/aabd0e},
journal = {Plasma Physics and Controlled Fusion},
number = 7,
volume = 60,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Schematic for the experimental setup. An electron beam generated by a tungsten filament travels about 20 cm along the magnetic field and reaches a floating potential (Vf) probe array. The filament is radially located at the center of the floating potential probe, 62 cm from the center ofmore » MRX. The 1D profile of Vf is measured to determine the location of the electron beam as well as the profile of the electron beam density. The magnitude of the Vf perturbation is compared with theoretical values. The magnetic field is generated by external coils, which produces straight field lines.« less

Save / Share:

Works referenced in this record:

Detection of an electron beam in a high density plasma via an electrostatic probe
dataset, January 2018

  • Majeski, Stephen; Yoo, Jongsoo; Zweben, Stewart
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562008

Electron beam and magnetic field mapping techniques used to determine field errors in the ATF torsatron
journal, August 1989

  • Colchin, R. J.; Anderson, F. S. B.; England, A. C.
  • Review of Scientific Instruments, Vol. 60, Issue 8
  • DOI: 10.1063/1.1141082

Three-dimensional photogrammetric measurement of magnetic field lines in the WEGA stellarator
journal, December 2009

  • Drewelow, Peter; Bräuer, Torsten; Otte, Matthias
  • Review of Scientific Instruments, Vol. 80, Issue 12
  • DOI: 10.1063/1.3263820

First measurements of error fields on W7-X using flux surface mapping
journal, August 2016


Magnetic reconnection
journal, March 2010


Study of driven magnetic reconnection in a laboratory plasma
journal, May 1997

  • Yamada, Masaaki; Ji, Hantao; Hsu, Scott
  • Physics of Plasmas, Vol. 4, Issue 5
  • DOI: 10.1063/1.872336

Bulk ion acceleration and particle heating during magnetic reconnection in a laboratory plasma
journal, May 2014

  • Yoo, Jongsoo; Yamada, Masaaki; Ji, Hantao
  • Physics of Plasmas, Vol. 21, Issue 5
  • DOI: 10.1063/1.4874331

Instantaneous Direct‐Display System of Plasma Parameters by Means of Triple Probe
journal, August 1965

  • Chen, Sin‐Li; Sekiguchi, T.
  • Journal of Applied Physics, Vol. 36, Issue 8
  • DOI: 10.1063/1.1714492

Beam scattering and heating at the front of an electron beam injected into a plasma
journal, June 1994

  • Chan, L. Y.; Stenzel, R. L.
  • Physics of Plasmas, Vol. 1, Issue 6
  • DOI: 10.1063/1.870601

Laboratory Study of Magnetic Reconnection with a Density Asymmetry across the Current Sheet
journal, August 2014


Avalanches driven by pressure gradients in a magnetized plasma
journal, November 2017

  • Van Compernolle, B.; Morales, G. J.
  • Physics of Plasmas, Vol. 24, Issue 11
  • DOI: 10.1063/1.5001321

A New Type of High-Frequency Amplifier
journal, January 1949


Influence of electron beam on profile of sheath potentials in electron-beam-excited plasma apparatus
journal, November 1997

  • Miyano, Ryuichi; Izumi, Shinya; Kitada, Ryoji
  • Plasma Sources Science and Technology, Vol. 6, Issue 4
  • DOI: 10.1088/0963-0252/6/4/013

    Works referencing / citing this record:

    Laboratory Measurements of Electrostatic Solitary Structures Generated by Beam Injection
    journal, September 2010


    Three-dimensional photogrammetric measurement of magnetic field lines in the WEGA stellarator
    journal, December 2009

    • Drewelow, Peter; Bräuer, Torsten; Otte, Matthias
    • Review of Scientific Instruments, Vol. 80, Issue 12
    • DOI: 10.1063/1.3263820

    The Electron-Wave Tube-A Novel Method of Generation and Amplification of Microwave Energy
    journal, January 1949


    Electron beam and magnetic field mapping techniques used to determine field errors in the ATF torsatron
    journal, August 1989

    • Colchin, R. J.; Anderson, F. S. B.; England, A. C.
    • Review of Scientific Instruments, Vol. 60, Issue 8
    • DOI: 10.1063/1.1141082

    Influence of electron beam on profile of sheath potentials in electron-beam-excited plasma apparatus
    journal, November 1997

    • Miyano, Ryuichi; Izumi, Shinya; Kitada, Ryoji
    • Plasma Sources Science and Technology, Vol. 6, Issue 4
    • DOI: 10.1088/0963-0252/6/4/013

    Cross-Field-Current Driven Lower-Hybrid Instability and Stochastic Ion Heating
    journal, June 1977


    Avalanches driven by pressure gradients in a magnetized plasma
    journal, November 2017

    • Van Compernolle, B.; Morales, G. J.
    • Physics of Plasmas, Vol. 24, Issue 11
    • DOI: 10.1063/1.5001321

    Study of driven magnetic reconnection in a laboratory plasma
    journal, May 1997

    • Yamada, Masaaki; Ji, Hantao; Hsu, Scott
    • Physics of Plasmas, Vol. 4, Issue 5
    • DOI: 10.1063/1.872336

    Beam scattering and heating at the front of an electron beam injected into a plasma
    journal, June 1994

    • Chan, L. Y.; Stenzel, R. L.
    • Physics of Plasmas, Vol. 1, Issue 6
    • DOI: 10.1063/1.870601

    Verification of Sheath Potential of Processing Plasma in an Electron-Beam-Excited Plasma Apparatus Using a Current Balance Equation
    journal, April 1996

    • Miyano, Ryuichi; Izumi, Shinya; Kitada, Ryouji
    • Japanese Journal of Applied Physics, Vol. 35, Issue Part 1, No. 4B
    • DOI: 10.1143/jjap.35.2427

    Instantaneous Direct‐Display System of Plasma Parameters by Means of Triple Probe
    journal, August 1965

    • Chen, Sin‐Li; Sekiguchi, T.
    • Journal of Applied Physics, Vol. 36, Issue 8
    • DOI: 10.1063/1.1714492

    Bulk ion acceleration and particle heating during magnetic reconnection in a laboratory plasma
    journal, May 2014

    • Yoo, Jongsoo; Yamada, Masaaki; Ji, Hantao
    • Physics of Plasmas, Vol. 21, Issue 5
    • DOI: 10.1063/1.4874331

    Plane Waves in an Ionized Gas with Static Electric and Magnetic Fields Present
    journal, January 1948


    First measurements of error fields on W7-X using flux surface mapping
    journal, August 2016


    A New Type of High-Frequency Amplifier
    journal, January 1949


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.