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Injection and Capture of Electrons in the UCI Stellatron

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5 Author(s)
Ishizuka, H. ; Department of Physics University of California Irvine, California 92717 ; Leslie, G. ; Mandelbaum, B. ; Fisher, A.
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An l=2 stellatron accelerator is under experimental study. The stellarator field has a strength of up to 10 kG and a rotational transform angle ¿ ~ 0.1. Electrons are injected from either a thermionic emitter or a field-emission cathode placed inside the torus. Typically, a 20 kV, 2-4 ¿s pulse is applied to the hot cathode which emits ~ 3 A. A 2 MeV, 200 A beam is formed due to betatron acceleration which immediately follows the injection. The injection voltage is raised to 60 kV with the cold cathode emitting ~ 30 A for ~ 0.4 ¿s. A significant increase in beam current is not observed. A beam in excess of 500 A is generated by injecting plasma and electrons simultaneously at the beginning of the stellarator field and starting the betatron acceleration after the plasma has diffused throughout the torus.

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Nuclear Science, IEEE Transactions on  (Volume:32 ,  Issue: 5 )