Collective Thomson scattering of a high power electron cyclotron resonance heating beam in LHD (invited)
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292 Gifu (Japan)
- Department of Energy Science and Technology, Nagoya University, Nagoya 464-8463 (Japan)
- Research Center for Development of FIR Region, University of Fukui, Fukui 910-8507 (Japan)
- Tera-Photonics Lab., RIKEN, Sendai 980-0845 (Japan)
- Association EURATOM-Risoe DTU, P.O. Box 49, DK-4000 Roskilde (Denmark)
Collective Thomson scattering (CTS) system has been constructed at LHD making use of the high power electron cyclotron resonance heating (ECRH) system in Large Helical Device (LHD). The necessary features for CTS, high power probing beams and receiving beams, both with well defined Gaussian profile and with the fine controllability, are endowed in the ECRH system. The 32 channel radiometer with sharp notch filter at the front end is attached to the ECRH system transmission line as a CTS receiver. The validation of the CTS signal is performed by scanning the scattering volume. A new method to separate the CTS signal from background electron cyclotron emission is developed and applied to derive the bulk and high energy ion components for several combinations of neutral beam heated plasmas.
- OSTI ID:
- 22055791
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
Suppression of spurious mode oscillation in mega-watt 77-GHz gyrotron as a high quality probe beam source for the collective Thomson scattering in LHD
Design of collective Thomson scattering system using 77 GHz gyrotron for bulk and tail ion diagnostics in the large helical device