Community Research and Development Information Service - CORDIS

Abstract

We analyze various effects that can influence ion temperature measurements based on Doppler broadening of impurity lines. Macroscopic effects such as inhomogeneities, plasma rotation and temporal modulations are distinguished from microscopic ones leading to species-dependent temperatures and anisotropy in the impurity distribution functions. There are turbulent effects related to the latter that can also cause deviations from thermodynamic equilibrium among light and heavy impurities. It is found that under neutral-beam-heated JET conditions (= n-"rm e" geq 1.5 cdot 10"13" cm"-3", PNI leq 5 MW) all effects should be small and influence the measured ion temperature by less than approx 10%. Larger influences could be expected from strongly peaked rotation profiles--for which, however, no indication are found--and high-level turbulence, which appears rather unrealistic, too.

Additional information

Authors: FUSSMANN G MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: AVAILABILITY: PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-R(87)12, 1987
Record Number: 1989126109300 / Last updated on: 1989-06-01
Category: PUBLICATION
Available languages: en