The conceptual design of an electron cyclotron emission imaging system for studying ITER-like high temperature plasmas
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- The conceptual design of an electron cyclotron emission imaging system for studying ITER-like high temperature plasmas
- Lee, Woochang; Yun, Gunsu; Park, Hyeon Keo; Nam, Yoonbum; Seon, C. R.
- Issue Date
- IOP PUBLISHING LTD
- PLASMA PHYSICS AND CONTROLLED FUSION, v.56, no.9, pp.1 - 11
- he design of an electron cyclotron emission imaging (ECEI) system for two-dimensional (2D) observation of the magnetohydrodynamical modes in high temperature ITER (from 'International Thermonuclear Experimental Reactor') H-mode-like plasmas (5.3T and 25keV) based on fundamental ordinary mode (O1-mode) and second-harmonic extraordinary mode (X2-mode) measurements is explored conceptually. For studying the spatial resolution in high temperature plasmas, the relativistic broadening and inward shift of the emission layer in the mid-plane are calculated. The radial spatial resolution is significantly degraded in the range R< 5.1m for the O1-mode and in the range R<6.9m for the X2-mode. The region with R<6.5m is inaccessible for X2-mode study. The emission layer width is enlarged in a narrow region of the pedestal due to the magnetic field being modified by the large pressure gradient. The broadening and shift in the poloidal plane are also calculated, to investigate their effects on 2D measurements. The frequency range of electron cyclotron emission measurements is selected to protect the system from stray radiations of the 170GHz electron cyclotron resonance heating source and to avoid harmonic overlap. The frequency ranges of 115-160GHz for the O1-mode and 230-320GHz for the X2-mode provide radial coverage of 5.9
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