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Design and commissioning of a novel LHCD launcher on Alcator C-Mod
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shiraiwa, Syun'ichi Meneghini, Orso Beck, W. Doody, Jeffrey Gibbon, Peter Mac Irby, Joel Johnson, D. Koert, Peter Lau, Cornwall Parker, Ronald R. Terry, D. Viera, R. Wallace, G. Wilson, J. Wukitch |
| Copyright Year | 2010 |
| Abstract | Abstract. The design, construction, and initial results of a new LH launcher (LH2) on Alcator C-Mod is presented. LH2 is based on a novel four way splitter concept which evenly splits the microwave power in four ways in the poloidal direction. This design allows the simplification of feeding structure, while keeping the flexibility to vary the peak launched toroidal spectrum from -3.8 to 3.8. Good plasma coupling over a wide range of edge densities and a clean spectrum were predicted by an integrated model using TOPLHA and CST microwave studio, in which the antenna plasma coupling problem and the vacuum side EM problem were solved self-consistently. Poloidal variations of the edge density were found to affect mainly the evenness of power splitting in the poloidal direction. In order to characterize the coupling performance, LH2 is equipped with a variety of dedicated diagnostics such as 16 sets of RF probes, six Langmuir probes, and three X-mode reflectometer horns. LH2 was successfully commissioned in July 2010 including these dedicated diagnostics. The measured transmission loss is about 30 % lower than the previous launcher and the clean spectrum has been confirmed. The power handling capability exceeding an empirical weak conditioning limit was demonstrated, and so far, the reliable operation upto 0.8 MW net LHCD power has been achieved. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www-pub.iaea.org/mtcd/meetings/PDFplus/2010/cn180/cn180_papers/ftp_p6-14.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
