Bulletin of the American Physical Society
49th Annual Meeting of the Division of Plasma Physics
Volume 52, Number 11
Monday–Friday, November 12–16, 2007; Orlando, Florida
Session CO3: NSTX and General Spherical Tokamak
2:00 PM–4:48 PM,
Monday, November 12, 2007
Rosen Centre Hotel Room: Salon 9/10
Chair: Mickey Wade, General Atomics
Abstract ID: BAPS.2007.DPP.CO3.11
Abstract: CO3.00011 : Recent EBW Emission Results on NSTX*
4:00 PM–4:12 PM
Preview Abstract Abstract
(Czech Inst. of Plasma Phys.)
NSTX high beta plasmas operate in the overdense regime, allowing the electrostatic electron Bernstein wave (EBW) to propagate and be strongly absorbed and emitted at the electron cyclotron resonances. As such, EBWs may enable local electron temperature measurements and provide local electron heating and current drive. For these applications, efficient coupling between EBWs and electromagnetic waves outside the plasma is needed. Thermal EBW emission, measured on NSTX with two remotely steered, quad-ridged antennas, has been used to determine the EBW transmission efficiency for a wide range of plasma conditions. The antennas collect fundamental (8-18GHz), second and third (18-40 GHz) EBW emission via the oblique B-X-O mode conversion process. Recent H-mode results show that fundamental and second harmonic EBW transmission efficiencies $>$30\% are observed for certain edge conditions. Experimental results from this diagnostic and comparisons to modeling will be presented.
*This work is supported by USDOE DE-AC02-76CH03073 and a grant to encourage innovations in fusion diagnostic systems.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.CO3.11
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