ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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 ι(Slashthrough accent mark)(similar, equals)0.1– 0.15. Electrons were injected from a thermionic emitter typically operated by applying 20 kV, 2– 4 μsec 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.866775
