First results of neutral beam heating on JET

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Abstract
A long pulse ( approximately 10 s) neutral beam injector with eight beam sources and one integrated beam-line system has been taken into operation on JET. The sources are arranged in two vertical groups. H0 beams were injected into D+ plasmas with particle energies (in the full energy fraction) of 0 beam heating experiments were started with D+ plasmas. The beam particle energy was 75 keV, the injected power fractions 76%, 17% and 7% and the total power and energy into the torus 7.7 MW and 35 MJ, respectively. The data presented are mainly from the 65 keV H0 beam experiments. Experiments were performed over a wide range of plasma parameters, i.e. plasma current Ip=1-4 MA, toroidal fields Bt=1.7-3.4 T and safety factors qcyl=1.7-10.5. Beam power scans were performed by firing various numbers of beams. When possible, the density time evolution n(t) was maintained during power scans by adding gas fuelling to compensate the reduced beam fuelling at lower powers.
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