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Abstract

A diagnostic system is used to investigate energy deposition on the first wall elements of the tokamak during a plasma discharge, with the aim of gaining better understanding and control of the plasma-wall interaction. The components of the system are described, and the effect of each of these on the accuracy of the system as a whole is discussed. Initial results demonstrate the efficacy of the system. As expected, energy deposition on the first wall elements is toroidally asymmetrical. During discharges with ICHR this asymmetry is probably influenced by the position of the active ICHR antennae. There is also a marked poloidal asymmetry: on the low field side the divertor plates are subject to a greater energy load than are the targets on the high field side. On ASDEX-Upgrade the system is employed as a standard diagnostic and is currently being used to study the relationship between toroidal and poloidal asymmetry of energy deposition and different discharge parameters , and in projects contributing towards the achievement of energy balance in the tokamak.

Additional information

Authors: RICHTER T H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);VERNICKEL H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 5/46 EN (1992) 32 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199211535 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: de
Available languages: de