Improvements in the CHERS system for DT experiments on TFTR (abstract)a)
- 1 January 1995
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 66 (1) , 642
- https://doi.org/10.1063/1.1146313
Abstract
Improvements in the charge exchange recombination spectroscopy (CHERS) system have resulted in accurate measurements of Ti and Vφ profiles during DT experiments. These include moving the spectrometer detector array and electronics farther away from the tokamak to a low neutron flux location. This relocation has also improved access to all components of the system. Also, a nonplasma‐viewing calibration fiber system was added to monitor the change in fiber transmission due to the high flux DT neutrons. Narrow band filtered light transmitted through the calibration fiber is now used as a reference for the Vφ measurement. At a high neutron flux of ∼2.5×1018 neutrons/s (peak fusion power∼6.2 MW) with total yield of 1.3×1018 neutrons a modest 5% decrease in fiber transmission was observed. Corrections for transmission loss are made and Ti(r,t) and Vφ(r,t) profiles are automatically calculated within four minutes of every shot.Keywords
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