rf measurements and tuning of the 750 MHz radio frequency quadrupole
Abstract
In the framework of the program on medical applications a compact 750 MHz RFQ has been designed and built to be used as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. It is divided into four segments and equipped with 32 tuners in total. The length of the RFQ corresponds to 5 λ which is considered to be close to the limit for field adjustment using only piston tuners. Moreover the high frequency, which is about double the frequency of existing RFQs, results in a sensitive structure and requires careful tuning. In this paper we present the tuning algorithm, the tuning procedure and rf measurements of the RFQ.
- Publication:
-
Physical Review Accelerators and Beams
- Pub Date:
- August 2017
- DOI:
- 10.1103/PhysRevAccelBeams.20.080102
- Bibcode:
- 2017PhRvS..20h0102K