Beam emission spectroscopy for density turbulence measurements on MAST

D. Dunai, A. R. Field, N. J. Conway, A. Thyagaraja, S. Zoletnik, J. Sárközi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

With the trial BES system currently installed on MAST it is possible to characterise relatively high-amplitude density turbulence at the periphery of L-mode plasmas and also to localise coherent MHD at the edge of H-mode plasmas. It is not possible, however, to characterise the core turbulence with confidence due to the limited signal level. Using these results, simulations of the BBS system have also been benchmarked against experiment. This gives confidence in the predicted performance of a BES 2D imaging system, which is planned to be built for MAST in 2008. This system is to utilise in-vessel optics with much increased étendu (x40) and should be able to detect fluctuations at the 0.3% level at 1 MHz bandwidth. It is planned to use a custom camera based on an 8x4 channel APD array sensor (Hamamatsu S8550) imaged with direct coupled optics to a l6×8 cm2 region in the plasma. With such a 2D imaging system it should be possible to observe turbulence flow patterns and features such as CAMs and zonal flows, as have been observed using the system installed on the DIII-D tokamak [2].

Original languageEnglish
Title of host publication34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
Pages1970-1973
Number of pages4
Edition3
Publication statusPublished - Dec 1 2007
Event34th European Physical Society Conference on Plasma Physics 2007, EPS 2007 - Warsaw, Poland
Duration: Jul 2 2007Jul 6 2007

Publication series

Name34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
Number3
Volume31

Other

Other34th European Physical Society Conference on Plasma Physics 2007, EPS 2007
CountryPoland
CityWarsaw
Period7/2/077/6/07

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Dunai, D., Field, A. R., Conway, N. J., Thyagaraja, A., Zoletnik, S., & Sárközi, J. (2007). Beam emission spectroscopy for density turbulence measurements on MAST. In 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts (3 ed., pp. 1970-1973). (34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts; Vol. 31, No. 3).