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Development of superconducting niobium accelerating structures for heavy ions

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3 Author(s)
Shepard, K.W. ; Argonne National Laboratory ; Takeuchi, S. ; Zinkann, G.P.

Results of tests of two new designs for superconducting niobium resonant cavities are presented. Both types resonate at 145.5 MHz and accelerate most efficiently for particle velocities β= v/c = 0.16. One resonator is of the split-ring type, but of a simpler design than a previously reported β=.16 unit. Although the surface fields are higher, the performance is somewhat better than for the earlier design: an accelerating field Ea= 4.3 MV/m has been obtained at 4.2K with 4w of rf input, where Eais defined as the energy gain per unit charge for a synchronous particle averaged over the interior resonator length. The other resonator is an 8-inch OD tapered coaxial quarter-wave line terminated with a drift tube of 1.50 inch aperture. At 4.2K, this resonator exhibits a low-level Q of 2×109, and has achieved Ea= 4.7 MV/m with 2.8w of rf input.

Published in:

Magnetics, IEEE Transactions on  (Volume:21 ,  Issue: 2 )