A collective Thomson scattering (CTS) system based on CO 2 laser is being developed in JT-60U to demonstrate the feasibility of ion temperature and alpha particle measurement in international thermonuclear experimental reactor (ITER). A new and effective method of measuring the spatial profile of absolute detection efficiency of an infrared heterodyne receiver has been developed for the CTS system. The viewing area and divergence of the field of view were first investigated with this method. Consequently, the spot size of the field of view could be narrowed to 0.74 mrad by adjusting the focal length of the local oscillator. The effective sample volume length determined by the injection beam waist and divergence of the field of view was also investigated.
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Lee et al. (2002) studied this question.
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