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ICRF Heating for the Non-Activated Phase of ITER: From Inverted Minority to Mode Conversion Regime

Authors :
D. Van Eester
R. C. Felton
J. Harling
E. Lerche
Jet Efda contributors
E. de la Luna
K. D. Lawson
C. Gowers
M.-L. Mayoral
Fernando Meo
G. Piazza
P. de Vries
P. Beaumont
Isabel L. Nunes
P. U. Lamalle
Martin Laxåback
M. J. Mantsinen
M. Santala
J.-M. Noterdaeme
V. G. Kiptily
P. J. Lomas
Source :
AIP Conference Proceedings.
Publication Year :
2005
Publisher :
AIP, 2005.

Abstract

In the initial phase of ITER H plasmas will be used in order to avoid activating the machine. The reference ICRF healing scenarios rely on minority species such as Helium (3He) or deuterium (D). These schemes’ distinctive feature comes from the presence of the fast magnetosonic wave ion‐ion hybrid resonance/cut‐off pair, between the antennas and the minority cyclotron layer. In order to document these unusual heating schemes, ICRF experiments were carried out recently on JET. First, the use of 3He ions in H plasmas was investigated with a sequence of discharges in which 5 MW of ICRF power was coupled to the plasma and the 3He concentration was varied from below 1% up to 10%. The inverted minority heating regime was observed at low concentrations (up to ∼2%). Energetic tails in the 3He distribution were observed with effective temperatures up to 300 keV and central electron temperatures up to 6 keV. At around 2%, a sudden transition was reproducibly observed to the mode conversion regime, in which the ICRF...

Details

ISSN :
0094243X
Database :
OpenAIRE
Journal :
AIP Conference Proceedings
Accession number :
edsair.doi...........9d9e9c65d760edf21b4e8bd494dc847b
Full Text :
https://doi.org/10.1063/1.2098208