Tuning of the RF field of the DTL for the J-PARC

Author

Naito, F. ; Tanaka, H. ; Ikegami, M. ; Kato, T. ; Takasaki, E. ; Ito, T.

Author_Institution

KEK, Tsukuba, Japan

Volume

5

fYear

2003

fDate

12-16 May 2003

Firstpage

2835

Abstract

Tuning of the accelerating field of the DTL first tank for the Japan Proton Accelerator Research Complex (J-PARC) has been done. The first DTL tank consists of 75 full drift tubes, 37 post-couplers and 10 fixed tuners. The resonant frequency of the tank is 324 MHz. An uniform accelerating field has been achieved by the fine adjustment of the post-couplers and the fixed tuners. The field stabilization by the post-couplers against perturbations has been confirmed also. In order to achieve the stabilized-uniform distribution of the average field for each accelerating gap, the following techniques have been applied for the post-coupler tuning: (1) non-uniform insertion length of the post-coupler from the tank wall; (2) increment of the diameter of several post-couplers. The recipe of the fine post-coupler tuning is described.

Keywords

accelerator RF systems; beam handling equipment; linear accelerators; particle beam stability; proton accelerators; 324 MHz; DTL tank; J-PARC; Japan Proton Accelerator Research Complex; RF field tuning; drift tubes; drift-tube linac; field stabilization; fine post-coupler tuning; fixed tuners; nonuniform insertion length; post-couplers; uniform accelerating field; Acceleration; Couplers; Indium tin oxide; Linear particle accelerator; Particle beams; Proton accelerators; Radio frequency; Structural beams; Synchrotrons; Tuners;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289737

Filename

1289737