CERN Accelerating science

Article
Title	Development of C-band Accelerating Section for SuperKEKB
Author(s)	Kamitani, T ; Delerue, N ; Ikeda, M ; Kakihara, K ; Ohsawa, S ; Oogoe, T ; Sugimura, T ; Takatomi, T ; Yamaguchi, S ; Yokoyama, K
Affiliation	(KEK, Ibaraki GUAS/AS, Ibaraki)
Publication	2004
In:	22nd International Linear Accelerator Conference, Lubeck, Germany, 16 - 20 Aug 2004, pp.663
Subject category	Accelerators and Storage Rings
Abstract	For the luminosity upgrade of the present KEK B-factory to SuperKEKB, the injector linac has to increase the positron acceleration energy from 3.5 to 8.0 GeV. In order to double the acceleration field gradient from 21 to 42 MV/m, design studies on C-band accelerator module has started in 2002. First prototype 1-m long accelerating section has been fabricated based upon a design which is half scale of the present S-band section. High power test of the C-band section has been performed at a test stand and later at an accelerator module in the KEKB injector linac. In a beam acceleration test, a field gradient of 41 MV/m is achieved with 43 MW RF power from a klystron. This paper report on the recent status of the high-power test and also the development of a second prototype section.