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

Title: Ion energy and plasma measurements in the near field of an ICRF antenna

Abstract

Plasma properties and ion energies have been measured in the near field of an ICRF antenna to determine the effects of rf fields in a magnetized plasma sheath on the energy of ions incident on the surface of the Faraday shield. A resonant loop antenna with a two-tier Faraday shield was used on the RF Test Facility at Oak Ridge National Laboratory (ORNL). The magnetic field near the antenna is {similar to}2 kG, and the plasma density is {similar to}10{sup 11} cm{sup {minus}3} with an electron temperature of 6--10 eV. The time-varying floating potential was measured with a capacitively coupled probe, and the time-averaged electron temperature electron density, and floating potential were measured with a Langmuir probe. Both probes were canned poloidally in front of the antenna, parallel to the current strap. Diagnostic for measuring ion energies included a gridded energy analyzer located directly below the antenna. Measured ion energies are compared with predictions from a computational model for determining the energy and angular distibution of ions incident on a surface in a magnetized plasma sheath with a time-varying plasma potential.

Authors:
 [1];  [2]
  1. University of Illinois, Urbana, IL (USA)
  2. Oak Ridge National Laboratory, Oak Ridge, TN (USA)
Publication Date:
OSTI Identifier:
6508752
Report Number(s):
CONF-8905120-
Journal ID: ISSN 0094-243X; CODEN: APCPC; TRN: 90-032525
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Journal Name:
AIP Conference Proceedings (American Institute of Physics); (USA)
Additional Journal Information:
Journal Volume: 190:1; Conference: 8. topical conference on radio frequency power in plasmas, Irvine, CA (USA), 1-3 May 1989; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; ANTENNAS; ELECTRON TEMPERATURE; ICR HEATING; LANGMUIR PROBE; PLASMA DENSITY; PLASMA DIAGNOSTICS; CLOSED PLASMA DEVICES; ELECTRIC PROBES; ELECTRICAL EQUIPMENT; EQUIPMENT; HEATING; HIGH-FREQUENCY HEATING; PLASMA HEATING; PROBES; THERMONUCLEAR DEVICES; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production

Citation Formats

Caughman, J.B.O. II, Ruzic, D N, and Hoffman, D J. Ion energy and plasma measurements in the near field of an ICRF antenna. United States: N. p., 1989. Web.
Caughman, J.B.O. II, Ruzic, D N, & Hoffman, D J. Ion energy and plasma measurements in the near field of an ICRF antenna. United States.
Caughman, J.B.O. II, Ruzic, D N, and Hoffman, D J. 1989. "Ion energy and plasma measurements in the near field of an ICRF antenna". United States.
@article{osti_6508752,
title = {Ion energy and plasma measurements in the near field of an ICRF antenna},
author = {Caughman, J.B.O. II and Ruzic, D N and Hoffman, D J},
abstractNote = {Plasma properties and ion energies have been measured in the near field of an ICRF antenna to determine the effects of rf fields in a magnetized plasma sheath on the energy of ions incident on the surface of the Faraday shield. A resonant loop antenna with a two-tier Faraday shield was used on the RF Test Facility at Oak Ridge National Laboratory (ORNL). The magnetic field near the antenna is {similar to}2 kG, and the plasma density is {similar to}10{sup 11} cm{sup {minus}3} with an electron temperature of 6--10 eV. The time-varying floating potential was measured with a capacitively coupled probe, and the time-averaged electron temperature electron density, and floating potential were measured with a Langmuir probe. Both probes were canned poloidally in front of the antenna, parallel to the current strap. Diagnostic for measuring ion energies included a gridded energy analyzer located directly below the antenna. Measured ion energies are compared with predictions from a computational model for determining the energy and angular distibution of ions incident on a surface in a magnetized plasma sheath with a time-varying plasma potential.},
doi = {},
url = {https://www.osti.gov/biblio/6508752}, journal = {AIP Conference Proceedings (American Institute of Physics); (USA)},
issn = {0094-243X},
number = ,
volume = 190:1,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1989},
month = {Sat Jul 01 00:00:00 EDT 1989}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: