Advances in thermal imaging
Tore Supra�s (TS) present mission is to study high energy long duration discharges. The last step in this direction has been to upgrade its power exhaust capability to run 1000 sec discharges with power densities in the 10 MW/m(2) range on actively cooled target plates. High performance water cooling very closely beneath the carbon surface of the targets allows to keep the surface temperature at an acceptable level of 1000 degrees Celsius. This condition needs to becarefully monitored since even only localised overheating can rapidly leap to a water-leak. Responding to this challenge, a new approach to the use of thermal imaging in tokamaks has been taken to ensure safe operation. Endoscopes and detectors needed to be adapted to the environmental conditions while fulfilling the spatial and temporal resolution requirements. Part of the heavy flux area is inaccessible to direct view, requiring the use of optical fibres, which prompted a detour from the standard infrared (IR) range into the near infrared (NIR) region where unexpected spectral features were encountered. The 100% coverage of the target areas and the long duration of the discharges led to an unusually large amount of data to handle both by the security system and the human supervisor.
Bibliographic Reference: An article, published in: Advanced Diagnostics for Magnetic and Inertial Fusion, (2002) p.383-390, Kluwer Academic/Plenum Publishers
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: email@example.com
Record Number: 200417807 / Last updated on: 2004-12-01
Original language: en
Available languages: en