Enhancements to the JET poloidally scanning vacuum ultraviolet/visible spectrometers

Autor:	G. Cass, Jet-Efda Contributors, C. Hogben, C. F. Maggi, S. G. J. Tyrrell, M. Jennison, M. Buckley, M.F. Stamp, P. Heesterman, S. Griph, Robin Barnsley, Justin Williams, K-D. Zastrow, T. Elevant, M. Beldishevski, K. D. Lawson, J. Brzozowski
Rok vydání:	2012
Předmět:	Rotary encoder Physics Photomultiplier Jet (fluid) Spectrometer Physics::Instrumentation and Detectors business.industry X-ray optics Signal Optics Calibration Optoelectronics Plasma diagnostics business Instrumentation
Zdroj:	Review of Scientific Instruments. 83:10D536
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.4745213
Popis:	Enhancements to the JET poloidally scanning spectrometers are presented, which will aid the exploitation of the recently installed ITER-like wall in JET. They include the installation of visible filter∕photomultiplier tube assemblies and spectrometers and the replacement of large rotating mirrors in the JET vacuum with small oscillating mirrors outside. The upgrade has resulted in a more robust and reliable diagnostic than before, which is described. Drifts in the mirror angle reconstructed from quadrature encoder signals are found, a reference signal being required. The use of the small scanning mirrors necessitated the inclusion of focusing mirrors to maintain throughput into the vacuum ultraviolet spectrometers. The mirror design has taken account of the extreme sensitivity of the focusing to the grazing angle of incidence, an aspect of importance in the design of grazing incidence focusing components on future machines, such as ITER. The visible system has been absolutely calibrated using an in-vessel light source.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76a63ae8c8d023e93bbb2eccc8601b82 https://doi.org/10.1063/1.4745213 Zobrazit plný text záznamu