Measurements of the electron temperature by the Thomson scattering system on the Hanbit magnetic mirror device

A Thomson scattering system on the Hanbit magnetic mirror device has been i nstalled to measure the electron temperature and density of the plasma in t he central cell. The configuration is based on a standard 90 degrees scatte ring scheme. The optical system consists of a Q-switched Nd:YAG laser, inpu t optics, collection optics, spectrograph optics, detectors, and a data acq uisition system. Although the laser beam path is about 50 m long and the ba ckground emissions are not low, the electron temperature measurements have been made at a single point on a shot-by-shot basis, in which the stray lig ht was considerably suppressed by using a beam dump, a viewing dump, and ba ffles. The measured electron temperature is about 50-70 eV in experiments f or plasma production and heating by ICRF of 200-kW-rf power using a slot an tenna. A description of the installed system and the experimental results a re presented. (C) 2001 American Institute of Physics.