Initial Operation of the Alcator C-Mod ICRF Antennas with High-Z Metal Antenna Guards

Journal Article · Mon Sep 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2098225· OSTI ID:20726310

Schilling, G ^[1]; Wukitch, S J; Lin, Y; Parisot, A; Porkolab, M ^[2]

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1. Princeton University Plasma Physics Laboratory, Princeton NJ 08543 (United States)
2. MIT Plasma Science and Fusion Center, Cambridge, MA 02139 (United States)

The Alcator C-Mod ICRF antennas have been operated with BN antenna guards since 2000. This modification had followed the observation that metallic impurities in the plasma increased with increasing ICRF power. Systematic improvements to the antenna structure have allowed the launched power to be raised to the 6 MW level, with good heating efficiency and few deleterious effects on the plasma. BN is inherently fragile, and disruption mechanical shocks have resulted in fracturing of the antenna tiles, exposing the supporting metal structure. Since the antennas are now electrically in reasonable shape, and one of C-Mod's goals is to study the behavior of plasmas with all-metal plasma facing components, it was decided to replace the BN tiles with molybdenum. High power operation was resumed in March, 2005, and the behavior of the antennas during the present run campaign will be reported.

• OSTI ID: 20726310
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 787; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ANTENNAS
BORON NITRIDES
EFFICIENCY
FIRST WALL
FRACTURING
ICR HEATING
ION CYCLOTRON-RESONANCE
MOLYBDENUM
OPERATION
PLASMA
PLASMA IMPURITIES
RF SYSTEMS