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The lower hybrid system of Tore Supra (LHCD) is mainly devoted to current drive experiments allowing long pulse (greater than 30 s) discharges in the range of 1 - 2 MA and for line-averaged density around 3 x 1.0 E-19/m3. Up to now about 30 plasma shots have been performed with pulse duration larger than 30 s. Application of high power (6 MW) and long pulse (greater than 30 s) operation at a routine incident power density of 20 MW/m2 and constant outgassing in the range of 1 to 2 x 1.0 E-2 mPa.m3/s for 3 MW is outlined. Moreover the weak sensitivity of the reflection coefficient on a wide range of electronic density at the grill mouth allows the two launchers of the LHCD system to operate with a thermal load on the carbon guard limiter below 1% of the total power. The technical options of such long pulse capability are relevant for ITER devices requiring reliable and very long pulse operation (RF less than 20 - 30 MW/m2).

Additional information

Authors: REY G, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37066 ORA
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