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

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6244269

Ruzic, D N; Hoffman, D J

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 /approximately/2 kG, and the plasma density is /approximately/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 scanned poloidally in front of the antenna, parallel to the current strap. Diagnostics 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 distribution of ions incident on a surface in a magnetized plasma sheath with a time-varying plasma potential. 7 refs., 3 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6244269
• Report Number(s): CONF-8905120-6; ON: DE89011611
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Heating
& Injection Systems
ANGULAR DISTRIBUTION
ANTENNAS
DISTRIBUTION
ELECTRIC PROBES
ELECTRICAL EQUIPMENT
ELECTRON TEMPERATURE
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
IMPURITIES
LANGMUIR PROBE
MAGNETIC FIELDS
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA SHEATH
PROBES
RF SYSTEMS