Stellatron experiment at UC Irvine

Hiroshi Ishizuka

doi:10.1117/12.18575

1 April 1990 Stellatron experiment at UC Irvine

Hiroshi Ishizuka

Proceedings Volume 1226, Intense Microwave and Particle Beams; (1990) https://doi.org/10.1117/12.18575
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

The UCI (University of California Irvine) stellatron project started in 1984 as an extension of researches on a modified betatron. In addition to the purpose of proof ofprinciple a goal was set at accelerating a 1 kA heair to 10 NeV in a 41 cm najor radius and 4 cm n[nor radius torus. Formation of a 200 A beam and acceleration up to 4 MeV were dezionstrated using an electron injector. The current was increased by u''eans of plas startup. In this scherre plasniolds injected into the torus were confined in a rising stellarator field and a nultikA runaway current was induced by applying the hetatron field. As predicted theoretically two distinct types of instabilities created loss of electrons. One of their was the highnode orbital resonance that caused gradual decay and terwination of the current. The other was the negative ness instability which disrupted the beair at the early phase of accel eration. The loss due to the orbital ''Instability was suppressed by reducing the aziiruthal ripple of the toroidal ivagnetic field to less than 1 within the whole voluire of the torus. The abrupt loss due to the negative nss instability was replaced by a gradual one when the beam orbit was inintained close to the torus wall. TTder these conditions beams of over 1 kA and with a density of approximately 1 kA/cm'' were accelerated to several MeV

Citation Download Citation

Hiroshi Ishizuka "Stellatron experiment at UC Irvine", Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990); https://doi.org/10.1117/12.18575

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