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Abstract

A Thompson scattering system for simultaneous measurements of the electron temperature and density at three different positions at two different times during a single plasma shot has been developed for the EXTRAP-L1. It is characterized by densities in the range from 10**21 to 10**22 to 10**-3, temperatures up to 50 eV and a pinch radius of the order of 1 cm. A spatial resolution down to 3 mm between positions is obtained by imaging the plasma onto an array of quartz optical fibres at the output slit of the spectrometer. Fifteen PM tubes are used to detect the scattered radiation as well as the background radiation. Due to the relatively dense plasma prevailing in the present version of EXTRAP-L1 the number of scattered photons is large and the photon to electron conversion noise is small. The background radiation is the most important factor limiting the accuracy of the measurements.

Additional information

Authors: KARLSSON P ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN), ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN)
Bibliographic Reference: WRITE TO THE DEPARTMENT OF PLASMA PHYSICS AND FUSION RESEARCH, ROYAL INSTITUTE OF TECHNOLOGY, S-100 44 STOCKHOLM (SWEDEN), MENTIONING REPORT TRITA-PFU-86-01, 1986
Record Number: 1989124092600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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