ASDEX JOHANN SPECTROMETER, STATUS REPORT
Initial results of test and evaluation of the crystal holders have shown that the micromachined aluminium holders are far superior to the handpolished stainless steel holders. The best focus is 70 mum FWHM in the visible with central 65% of the crystal in proper focus. We would like to improve the collection efficiency to > 80% in the near future. Recent plasma operation has shown that ion temperature measurements will produce acceptable results. We are currently limited by the count rate of the detector. A high count rate position sensitive proportional counter (similar to the Princeton crystal X-ray detectors) should be deployed at the earliest possible opportunity.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP III/127, 1987
Record Number: 1989126109100 / Last updated on: 1989-06-01
Available languages: en