Abstract

The ECE diagnostic is one of the two primary systems for the measurement of electron temperature in ITER. It is capable of viewing the plasma for the whole pulse, including the startup and termination phases. In addition to the measurement of electron temperature profiles and related quantities, 1 it will also be used to provide measurements from which the total ECE power loss can be deduced. In this paper we present the outline design of the front end of the ECE diagnostic, which has been shaped by the following considerations: (i) The choice of an appropriate front end, (ii) the selection of an adequate sightline distribution, (iii) the optimisation of the front end to minimise the perturbation to the first wall and shield, and (iv) the incorporation of a suitable calibration mechanism.

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