Limiter heat load and consequences on impurity source and transport
Power deposition and consequences during short pulse operation t<2s, on non-actively cooled limiter (low field side) and large actively cooled inner-wall limiter of Tore Supra as well as long pulse operation t>20s are reported. Infrared surface temperature measurements, thermocouples and Langmuir probes are used to diagnose the inner wall front face. They are presented for the first time and are complemented by measurements of a reciprocating Langmuir probe located at the top of the machine. A diagram of injected energy versus power shows how difficult it is to run high power long pulses in steady state conditions, which is one of the main goals for the next step fusion machine. An uncontrolled density rise is observed during long pulse operation. It is believed that it is due to recessed elements heated by plasma or due to fast particle losses due to the ripple. The CIEL project will implement in Tore-Supra a set of actively cooled plasma facing components so that the performance of long pulse, high power shots should be improved.
Bibliographic Reference: Article: Journal of Nuclear Materials, 266-269 (1999), 272-279
Record Number: 199910753 / Last updated on: 1999-05-21
Original language: en
Available languages: en