Superconducting CH structure

Abstract

The superconducting CH structure is a novel multicell cavity for the acceleration of protons and ions in the low and intermediate energy regime. The CH structure is a cross-bar-type cavity; it is the first superconducting low energy multicell cavity operated in an H mode. A superconducting CH-prototype cavity with 19 gaps at 0:1 has been built and tested successfully. Maximum surface fields of 25 MV=m and a corresponding effective cavity voltage gain of 3.7 MV have been achieved. In this paper the development and the tests of this new cavity are presented. This includes also tuning and coupling methods as well as a comparison with other low energy cavities.

Recent EU activities for IFMIF EVEDA in the framework of the broader approach

“…Different cold tests have been made and Q values as high as 5 × 10 8 were measured, the highest effective voltage recorded in a low β sc cavity. These important results support the possible use of sc DTL in IFMIF [5].…”

Efficient solution for accelerating very high intensity beams in the low and medium energy regime

“…For very high intensities, a high accelerating gradient is favorable to relax serious space charge effects, and it can be achieved with SC accelerating structures much more easily. Taking advantage of the feature of the long lens-free sections allowed by KONUS, the superconducting CH (Crossbar H-Type) structure overcomes the lack of multi-cell, SC accelerating structures in the low and medium β region [10].…”

Matching the laser generatedpbunch into a crossbar-Hdrift tube linac

“…The CH-DTL structure is a multicell drift tube cavity ( Fig. 18) developed at IAP-Frankfurt [14,26,27], operating in the TE 210 mode (H 210 ). The structure has features like high shunt impedance, high acceleration gradients, and robustness in design.…”