Variable energy radio frequency quadrupole linac

Details Variable energy radio frequency quadrupole linac Variable energy radio frequency quadrupole linac

1994-02-08

1995-09-19

O'Shea, Sandra L.

Electric lamp and discharge devices: systems

High energy particle accelerator tube

Magnetic field acceleration means

315506, 315507, 315 542, 331 3, H01J 2300

Patent

active

054518474

ABSTRACT:
A variable energy radio frequency quadrupole linac for emitting focused and accelerated beams by changing radio frequency energy levels, wherein the accelerating cavity is divided by a plane perpendicular to the beam direction and in a radio frequency sense, and the radio frequency power level in the downstream accelerating cavity is made to be lower than that in the upstream accelerating cavity, one of the divided cavities being self oscillated, and the other being separately oscillated, a separating plate being provided between separated electrodes, the radio frequency phases in the upstream cavity and the downstream cavity being relatively changeable, and a thin plate region being provided in the periphery of a beam passing window on the separating plate, thereby the power in the cavity can be lowered without expanding the energy spread of the emitted beams so much.

REFERENCES:
patent: 4992744 (1991-02-01), Fujita et al.
patent: 5334943 (1994-08-01), Sawada
A. Schempp, "RFQ Accelerators For Ion Implantation," Nuclear Instruments and Methods in Physics Research B50 (1990) pp. 460-464, North-Holland.
N. Tokuda, S. Arai, A. Imanishi, T. Morimoto and E. Tojyo, "Progress Report On The INS 25.5-MHZ Split Coaxial RFQ," Particle Accelerators, 1992, Vols. 37-38, pp. 75-80.
Donald A. Swenson, "Extensions To The RFQ Domain," Particle Accelerators, 1990, vol. 32, pp. 21-26.
R. W. Thomae, "Recent Developments In Ion Implantation Accelerators," Nuclear Instruments and Methods in Physics Research B50 (1990) pp. 444-454, North-Holland.
Proceedings of the 7th Symposium on Accelerator Science and Technology, Dec. 1989, Osaka, Japan.

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