High power integral rf linac cavities

Conference · Mon Aug 01 04:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:5580029

Mitrovich, D; Cooper, R; Felber, F; Wilson, P

Accelerating a long train of high current pulses requires a very large power flow from cavity to beam. Several advantages exist when this large rf power is supplied to the accelerating cavities at the same high rate at which the beam is extracting it. A particular approach to accomplishing this, the wake field transformer concept of Voss and Weiland, as applied to the parameter regime of interest is examined here. Several high current, low energy (few MeV) beams injected offaxis into the cavity are decelerated by their own and preceding fields. The resulting rf energy in the proper mode accelerates a lower current, high energy beam on-axis. Mode generation by an idealized annular beam is calculated as a function of driving current pulse width, cavity length, and radius of the annulus. Optimal pulse width is about half the wavelength of the TM/sub 010/ accelerating mode, and the efficiency (the fraction of the energy going into the TM/sub 010/ mode) is maximized for annulus radius equal to about two-thirds the cavity radius. The modest transformer ratio of about three (ratio of accelerating potential on-axis to decelerating potential on the driving beam) can be increased by making the annulus larger and sacrificing efficiency. Analysis of the beam dynamics shows that an axial magnetic field of the order of 1 kG is adequate to guide the annular power beam.

• Research Organization: Western Research Corp., 8616 Commerce Ave., San Diego, CA 92121
• OSTI ID: 5580029
• Report Number(s): CONF-830311-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-30:4
• Country of Publication: United States
• Language: English

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