Validating the Lower Hybrid Interdigital-line Antenna on MST

Journal Article · Fri Sep 28 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800500· OSTI ID:21032781

Kaufman, M C; Goetz, J A; Burke, D R; Almagri, A F; Oliva, S P; Kulpin, J G ^[1]

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1. Department of Physics, University of Wisconsin, Madison, WI 53706 (United States)

Lower hybrid current drive has been posited as a means to reduce tearing fluctuations and improve confinement in the reversed field pinch. The third generation interdigital-line antenna has been installed in MST and preliminary testing has been completed. Source power to the antenna has been increased to >220 kW in both feed directions. Under vacuum conditions the n{sub parallel} spectrum is peaked at {approx}7.5 as expected with excellent directionality. External tuning gives a VSWR <1.3 under most operating conditions; however, power diagnostics on the resonators show a standing wave on the antenna which could affect launch spectrum. Initial plasma parameter surveys show behavior similar to the previous generation antenna. Hard x-ray detectors show flux is toroidally peaked, but still indicative of rf-plasma interaction.

• OSTI ID: 21032781
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 933; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
FLUCTUATIONS
HARD X RADIATION
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
MST DEVICE
PLASMA
PLASMA CONFINEMENT
RESONATORS
REVERSE-FIELD PINCH
STANDING WAVES
TESTING