First neutral beam experiments on Wendelstein 7-X
نویسندگان
چکیده
Abstract In the previous divertor campaign, Wendelstein 7-X (W7-X) device injected 3.6 MW of neutral beam heating power allowing for achievement densities approaching 2 × 10 20 m −3 , and providing first initial assessment fast ion confinement in a drift optimized stellarator. The injection (NBI) system on W7-X is comprised two boxes with space four radio frequency sources each. reported this work was achieved NI21 box. effect combined electron-cyclotron resonance (ECRH) NBI explored through series discharges varying both ECRH power. Discharges without saw linear increase line-integrated plasma density, strong peaking core over discharge duration. presence 1 found to be sufficient control continuous density rise during operation. Simulations wall loads were consistent experimental infrared camera images general, free from induced Alfvénic activity, low betas. These experiments provide data future scenario development fast-ion W7-X, key topic project.
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2021
ISSN: ['0029-5515', '1741-4326']
DOI: https://doi.org/10.1088/1741-4326/ac121c