Upgrades to the in-vessel calibration light source on JET

N. J. Conway, A. J. Cackett, C. F. Maggi, A. G. Meigs, K. D. Zastrow, T. M. Biewer, D. L. Hillis

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Since 2010, an in-vessel calibration light source (ICLS) has been used periodically on JET to calibrate a range of diagnostics at UV, visible, and IR wavelengths. During shutdowns, the ICLS (which is essentially an integrating sphere) is positioned within the vacuum vessel by the remote handling (RH) system. Following the 2013 calibration runs, several changes were made to improve the efficiency and quality of the calibrations. Among these was the replacement of a 20 m "umbilical" cable which carried power and other electrical signals through a vessel port to/from a control cubicle. A lightweight 2 m cable now plugs directly into a single connector on the RH manipulator system, greatly reducing the time required for deployment and improving operational flexibility; e.g., the vessel access "floor" no longer needs to be installed. This change also means the system would be compatible with calibrations after a high neutron-fluence period of operation. An on-board micro-spectrometer now allows for real-time verification of the emitted spectrum. Finally, new "baffles" were designed and installed within the integrating sphere itself, greatly improving the spectral radiance uniformity at non-normal viewing angles (necessary due to orientation uncertainties with the RH system).

Original languageEnglish
Article number10K107
JournalReview of Scientific Instruments
Volume89
Issue number10
DOIs
StatePublished - Oct 1 2018

Funding

This work has been carried out within the framework of the Contract for the Operation of the JET Facilities and has received funding from the European Union’s Horizon 2020 research and innovation programme. The work was also supported, in part, by the U.S. DOE under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. The views and opinions expressed herein do not necessarily reflect those of the European Commission or the U.S. DOE.

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