Electron Bernstein Wave Studies in MAST

Electron Bernstein Wave Studies in MAST

Electron Bernstein Wave Studies in MAST 150 150 Mathew

There is a comprehensive, closely-interlinked electron Bernstein wave (EBW) programme on MAST covering heating experiments, plasma start-up studies, plasma emission measurements, theory and modelling. In this paper we report on proof-of-principle EBW heating experiments conducted on MAST with a 60 GHz, 1 MW gyrotron complex. A 28 GHz (200 kW) EBW start-up system has been commissioned on MAST. The system is capable of launching both the X-mode and O-mode. The launched O-mode is mode converted into the X-mode by a mirror-polariser incorporated in a graphite tile on the centre column. As a result the X-mode is incident on the plasma from the high field side allowing efficient EBW excitation during the plasma start-up phase. First experimental results on non-inductive plasma current generation are presented. A frequency scanning EBW radiometer has been upgraded with a fast spinning mirror and 12 parallel receiving channels covering the range of 6-18 GHz. This system allows real time measurements of mode conversion dynamics during plasma evolution. First test results are presented.

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01/01/2007