Inductively driven surface-plasma negative ion source for N-NBI use (invited)

The long-pulse surface-plasma source prototype is developed at Budker Institute of Nuclear Physics for negative-ion based neutral beam injector use. The essential source features are (1) an active temperature control of the ion-optical system electrodes by circulation of hot thermal fluid through th...

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Bibliographic Details
Published in:Review of scientific instruments 2016-02, Vol.87 (2), p.02B316-02B316
Main Authors: Belchenko, Yu, Abdrashitov, G, Deichuli, P, Ivanov, A, Gorbovsky, A, Kondakov, A, Sanin, A, Sotnikov, O, Shikhovtsev, I
Format: Article
Language:English
Subjects:
Active control
ANIONS
CESIUM
DEPOSITION
ELECTRIC POTENTIAL
Electrodes
GRIDS
High voltages
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KEV RANGE 10-100
Negative ions
Neutral beams
Nuclear physics
OPTICAL SYSTEMS
PLASMA
Plasmas (physics)
Scientific apparatus & instruments
SURFACES
TEMPERATURE CONTROL
Tubes
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Description
Summary:The long-pulse surface-plasma source prototype is developed at Budker Institute of Nuclear Physics for negative-ion based neutral beam injector use. The essential source features are (1) an active temperature control of the ion-optical system electrodes by circulation of hot thermal fluid through the channels, drilled in the electrode bodies, (2) the concaved transverse magnetic field in the extraction and acceleration gaps, preventing the electrons trapping and avalanching, and (3) the directed cesium deposition via distribution tubes adjacent to the plasma grid periphery. The long term effect of cesium was obtained just with the single cesium deposition. The high voltage strength of ion-optical system electrodes was improved with actively heated electrodes. A stable H(-) beam with a current ∼1 A and energy 90 keV was routinely extracted and accelerated.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4932583