ANSAT, an antenna sheath analysis tool

Journal Article · Thu Feb 01 04:00:00 EST 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.49558· OSTI ID:285389

Myra, J R; DIppolito, D A ^[1]; Ho, Y L ^[2]

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1. Lodestar Research Corp., Boulder, Colorado 80301 (United States)
2. Science Applications International Corp., McLean, Virginia 22102 (United States)

A computer code, ANSAT (Antenna Sheath Analysis Tool) has been developed which allows an analysis of rf sheaths on the plasma facing regions of ICRF antennas. ANSAT, a post-processor for the ARGUS code, calculates the contact points of the tokamak magnetic field lines on the surface of the antenna Faraday screen and nearby limiters for realistic three dimensional magnetic flux surface and antenna geometries, and determines the rf voltage that can drive sheaths at the contact points. The code then assesses the resulting rf-induced convective cells, rf-driven sputtering, and sheath power dissipation. Diagnostics for {open_quote}{open_quote}hot spots{close_quote}{close_quote} on the Faraday screen, convective cell flow patterns, locations of sheaths, and classes of sheaths are available. The effect on the sheath voltages of bumper tiles, antenna skew and misalignment, error and ripple fields and plasma are addressed. It is shown by some examples that ANSAT is a useful tool for antenna design and for interpretation of ICRF experiments. {copyright} {ital 1996 American Institute of Physics.}

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-88ER53263; FG05-94ER81799
• OSTI ID: 285389
• Report Number(s): CONF-9505105--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 355; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
A CODES
ANTENNAS
COMPUTER CODES
DESIGN
FARADAY EFFECT
ICR HEATING
MAGNETIC SURFACES
PLASMA SHEATH
SHIELDS
TOKAMAK DEVICES