Neutral beam injector oxygen impurity measurements and concentration reduction via gettering processes
نویسندگان
چکیده
منابع مشابه
Demonstration of 500 keV beam acceleration on JT-60 negative-ion-based neutral beam injector
Hydrogen negative ion beams of 486 keV, 2.8A and 507 keV, 1A have been successfully produced in the JT-60U negative ion source with multi aperture, multi grid accelerator of three stages. This is the first accomplishment of the H beam acceleration up to 500 keV at high-current of > 1 A. These successful productions of the high-energy beams at high current have been achieved by overcoming a poor...
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The cathodic reduction of SiO2 in KCl-CaCl2-NaCl-MgCl2 melt was studied using tungsten wires as working electrodes. The results of cyclic voltammetry square wave voltammetry and chronopotentiometry showed that the cathodic deposition of silicon is a quasi-reversible diffusion-controlled reaction, followed by a four electrons transfer step. The results of current reversal chronopotentiometry and...
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Large-area RF-driven ion source is being developed at Germany for the heating and current drive of ITER device [1, 2]. Negative hydrogen ion sources are major components of neutral beam injection systems in future large-scale fusion experiments such as ITER and DEMO. RF sources for the production of positive hydrogen ions have been successfully developed at IPP (Max-Planck-Institute for Plasma ...
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This paper reports recent R&D results on negative ion-based NBI for JT-60SA where 10 MW neutral beam is designed to inject for 100 seconds. There are major two issues such as improvement of voltage holding capability and reduction of the grid power loading of the JT-60U negative ion source with three acceleration stages. To improve the voltage holding capability, the breakdown location with the...
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A joint Japan-EU R&D activity is in progress to optimize the accelerator for the ITER NBI. The accelerator baseline design is based on a five grids system which can be adapted to operate with three grids for initial operations at low voltage (500 kV). Moreover, in order to speed up the test of the NBI system at the Test Facility, a negative ion source with extraction voltage up to 100kV will be...
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ژورنال
عنوان ژورنال: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
سال: 1985
ISSN: 0734-2101,1520-8559
DOI: 10.1116/1.573122