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An ECH beam monitor for the Texas Experimental Tokamak

 

作者: D. R. Roberts,  

 

期刊: Review of Scientific Instruments  (AIP Available online 1992)
卷期: Volume 63, issue 11  

页码: 5237-5244

 

ISSN:0034-6748

 

年代: 1992

 

DOI:10.1063/1.1143434

 

出版商: AIP

 

数据来源: AIP

 

摘要:

A compact poloidal array of ten receiving antennae has been installed on the high‐field wall (x=+30 cm) of the Texas Experimental Tokamak (TEXT) opposite the electron cyclotron heating (ECH) microwave launch port (x=−45 cm, 60 GHz, 200 kW). Both these antennae and the launching structure are oriented to couple to the ordinary mode in plasma. The array serves as a diagnostic of the unabsorbed, first‐pass ECH microwave power, which includes both power refracted by the equilibrium plasma density gradients and power scattered by density fluctuations. Each antenna has a &Dgr;&thgr;y=13° poloidal and &Dgr;&thgr;z=32° toroidal half‐power beam width, corresponding to 12‐dB gain. For refraction studies, interchannel and intrachannel poloidal resolutions are &Dgr;y=3.5 and 2.5 cm, respectively, at the array aperture surface. For scattering studies, the wave number selectivity extends fromk⊥=0±2.5 cm−1tok⊥=7±2.5 cm−1.

 

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