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US 4,286,192 AGranted
Variable energy standing wave linear accelerator structure
AssigneeVarian Associates, Inc.
InventorsEiji Tanabe, Victor A. Vaguine
Life of this patent
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AssigneeVarian Associates, Inc.
InventorsEiji Tanabe, Victor A. Vaguine
Estimating the term…
Variable energy selection is accomplished in a side cavity coupled standing wave linear accelerator by shifting the phase of the field in a selected side coupling cavity by .pi. radians where such side coupling cavity is disposed intermediate groups of accelerating cavities. For an average acceleration energy of E.sub.1 (MeV) per interaction cavity, and a total number of N interaction cavities, the total energy gain is E.sub.1 (N-2N.sub.1) where N.sub.1 is the number of interaction cavities traversed beyond the incidence of the phase shift. The phase shift is most simply accomplished by changing the selected side cavity configuration mechanically in repeatable manner so that its resonant excitation is switched from TM.sub.010 mode to either TM.sub.011 or TEM modes. Thus, the total energy gain can be varied without changing the RF input power. In addition, the beam energy spread is unaffected.
In a particle accelerator, a resonant acceleration circuit comprising at least three cavities having substantially the same resonant frequencies and electromagnetically coupled in sequence, a first and third of said cavities comprising holes through their walls for passage of a beam of particles and for coupling electromagnetic energy to said beam, a second cavity coupled to each of said first and third cavities, but uncoupled from said beam, the improvement comprising:
A particle accelerator comprising at least three interaction cavities having holes through their walls for passage of a beam of particles and for coupling electromagnetic energy to said beam, at least two coupling cavities each coupled to two of said interaction cavities, and means for selectively changing the resonant mode pattern in two of said coupling cavities to provide a change in phase of the wave energy in the coupled interaction cavities.
Dependencies are inferred from the claim text.