Coupled-cavity drift-tube linac
AssigneeThe Regents of the Univ. of California
InventorJames H. Billen
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Abstract
A coupled-cavity drift-tube linac (CCDTL) combines features of the Alvarez drift-tube linac (DTL) and the .pi.-mode coupled-cavity linac (CCL). In one embodiment, each accelerating cavity is a two-cell, 0-mode DTL. The center-to-center distance between accelerating gaps is .beta..lambda., where .lambda. is the free-space wavelength of the resonant mode. Adjacent accelerating cavities have oppositely directed electric fields, alternating in phase by 180 degrees. The chain of cavities operates in a .pi./2 structure mode so the coupling cavities are nominally unexcited. The CCDTL configuration provides an rf structure with high shunt impedance for intermediate velocity charged particles, i.e., particles with energies in the 20-200 MeV range.
Claims11
A linear accelerator (linac) for accelerating charged particles with radio frequency (rf) energy through an intermediate velocity range, said accelerator comprising:
- a plurality of accelerating cavities, each one of said accelerating cavities defining input and output coaxial bore tubes connecting adjacent ones of said accelerating cavities;
- and
- a number of drift tubes, n, within each of said accelerating cavities located intermediate and coaxial with said input and output bore tubes, said n drift tubes defining n+1 accelerating gaps between said input and output bore tubes, wherein the center-to-center spacing between successive ones of said accelerating gaps in said accelerating cavity is the distance a particle travels in one period of said rf.
A linear accelerator (linac) for accelerating charged particles through an intermediate velocity range, said accelerator comprising:
- a plurality of resonantly coupled accelerating cavities coupled with nominally unexcited coupling cavities to form a .pi./2 mode linac accelerating structure, each one of said accelerating cavities defining input and output coaxial bore tubes connecting adjacent ones of said accelerating cavities;
- and
- a number of drift tubes n within each of said accelerating cavities located intermediate and coaxial with said input and output bore tubes, said n drift tubes defining n+1 accelerating gaps between said input and output bore tubes.
A linear accelerator (linac) for accelerating charged particles through an intermediate velocity range, said accelerator comprising:
- a plurality of accelerating cavities, each one of said accelerating cavities defining input and output coaxial bore tubes connecting adjacent ones of said accelerating cavities;
- and
- a number of drift tubes n within each of said accelerating cavities located intermediate and coaxial with said input and output bore tubes, said n drift tubes defining n+1 accelerating gaps between said input and output bore tubes;
- wherein each said accelerating cavity has a length of (2n+1)/2 times the distance a particle travels in one period of said rf.
Dependencies are inferred from the claim text.