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Injection, trapping, and acceleration of an electron beam in a stellatron accelerator
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Injection, trapping, and acceleration of an electron beam in a stellatron accelerator
作者:
B. Mandelbaum,
H. Ishizuka,
A. Fisher,
N. Rostoker,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1988)
卷期:
Volume 31,
issue 4
页码: 916-923
ISSN:0031-9171
年代: 1988
DOI:10.1063/1.866775
出版商: AIP
数据来源: AIP
摘要:
The UCI modified betatron [Phys. Rev. Lett.53, 266 (1984)] was converted into a stellatron accelerator by the addition of helical quadrupole coils to the betatron configuration. An experimental study of the injection, trapping, acceleration, and disruption of a beam in this apparatus has been conducted. The stellarator field applied was of up to 10 kG and with a rotational transform of &igr;&slash;≃0.1– 0.15. Electrons were injected from a thermionic emitter typically operated by applying 20 kV, 2– 4 &mgr;sec pulses to the hot cathode, which emitted ∼3 A. A beam of ∼200 A was trapped in the torus and accelerated by the betatron field applied immediately after the injection. The beam life was extended by increasing the toroidal field. The beam current suffered a partial disruption after it reached its peak value. After that the beam lost electrons gradually, accompanied by generation of x rays, until the entire beam was lost close to the peak of the accelerating betatron field. Electron energies of up to ∼4 MeV were reached. The dependence of the beam current and its lifetime, upon the applied fields and injection conditions, was explored.
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