Characterisation of local ICRF heat loads on the JET ILW

When using Ion Cyclotron Range of Frequency (ICRF) heating, enhanced heat-fluxes are commonly observed on some plasma facing components close to the antennas. Experiments have recently been carried out on JET with the new ITER-Like-Wall (ILW) to characterize the heat flux to the JET ICRF antennas. U...

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Bibliographic Details
Published in:Journal of nuclear materials 2013-07, Vol.438 (S), p.S379-S383
Main Authors: Jacquet, P., Marcotte, F., Colas, L., Arnoux, G., Bobkov, V., Corre, Y., Devaux, S., Gardarein, J.-L., Gauthier, E., Graham, M., Lerche, E., Mayoral, M.-L., Monakhov, I., Rimini, F., Sirinelli, A., Van Eester, D.
Format: Article
Language:English
Subjects:
Antennas
Cyclotron frequency
Deposition
Dipoles
Ion cyclotron radiation
Nuclear power generation
Phasing
Physics
Straps
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Summary:When using Ion Cyclotron Range of Frequency (ICRF) heating, enhanced heat-fluxes are commonly observed on some plasma facing components close to the antennas. Experiments have recently been carried out on JET with the new ITER-Like-Wall (ILW) to characterize the heat flux to the JET ICRF antennas. Using Infra-Red thermography and thermal models of the tiles, heat-fluxes were evaluated from the surface temperature increase during the RF phase of L-mode plasmas. The maximum observed heat-flux intensity was ∼4.5MW/m2 when operating with −π/2 current drive strap phasing at power level of 2MW per antenna and with a 4cm distance between the plasma and the outer limiters. Heat-fluxes are reduced when using dipole strap phasing. The fraction of ICRF power deposited on the antenna limiters or septa was in the range 2–10% for dipole phasing and 10–20% with±π/2 phasing.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.01.075