RF discharge-based plasma emitter |
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Authors: | A A Ivanov I V Shikhovtsev A A Podyminogin I I Averboukh T D Akhmetov V I Davydenko P P Deichuli |
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Institution: | (1) Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent'eva 11, Novosibirsk, 630090, Russia |
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Abstract: | An injector of hydrogen atoms for plasma diagnostics in modern tokamaks has been developed at the Budker Institute of Nuclear Physics (Novosibirsk). The ion source of the injector produces a proton (helium ion) beam with a current of up to 2 A (1 A), an ion energy of up to 55 keV, a beam divergence of ~0.6\deg, and a pulse duration of up to 10 s. An RF discharge-based plasma emitter, which is one of the main parts of the ion source, is described. The emitter diameter is 72 mm, the ion current density is 120 mA/cm2, and the inhomogeneity of the current density is ±6%. The beam is formed by a four-electrode ionoptical system with 163 round apertures. At a current of 2 A, the ion beam consists of 67% protons, 18% H 2 + ions, and 15% H 3 + ions, the total content of heavier ions in the beam being no higher than 2–3%. |
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