Emission properties of inductively driven negative ion source for NBI

H− beam with current ∽1A and energy up to 90 kV was routinely produced by the negative ion source, developed at Budker Institute of Nuclear Physics for N-NBI use. The essential source features are: the surface-plasma negative ion production on the plasma grid surface, the active temperature control...

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Bibliographic Details
Main Authors: Abdrashitov, G., Belchenko, Yu, Ivanov, A., Konstantinov, S., Sanin, A., Shikhovtsev, I., Sotnikov, O., Stupishin, N.
Format: Conference Proceeding
Language:English
Subjects:
Active control
Cesium
Dynamic stability
Electrodes
Emission analysis
High voltages
Ion beams
Ion optics
Ions
Negative ions
Nuclear physics
Plasma
Plasma (physics)
Temperature control
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Summary:H− beam with current ∽1A and energy up to 90 kV was routinely produced by the negative ion source, developed at Budker Institute of Nuclear Physics for N-NBI use. The essential source features are: the surface-plasma negative ion production on the plasma grid surface, the active temperature control of the ion-optical system electrodes, the convex magnetic field in the ion optics for the high-voltage holding enhancement, and the directed cesium deposition to the plasma grid electrode. The emission properties of the source have been studied for two RF driver configurations: with and without Faraday screen. Negative ion beam with current of 1.1 A, energy 93 keV and duration 1.6 s was produced in the cases of driver without Faraday screen. Beams with current of 0.6 A, energy 74 keV were obtained in pulses with duration of 25 s for driver with Faraday screen. Long-term stability of the beam current during 25 s pulse confirms the dynamic stability of cesium coverage on emission area of plasma grid electrode.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4964169