Author: Saito, K.
Paper Title Page
WEPFI019 High Power Test of Kanthal-coated L-band Lossy Cavity 2744
  • F. Miyahara, Y. Arakida, Y. Higashi, T. Higo, K. Kakihara, S. Matsumoto
    KEK, Ibaraki, Japan
  • K. Saito
    Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan
  • H. Sakurabata
    Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken, Japan
  We have been developing a Kanthal (Al-Cr-Fe)-coated collinear load as a possible candidate of the L-band acc. structure of SuperKEKB positron capture system. In order to achieve the higher capture efficiency comparing to that of KEKB, the upgrade of the e+ production and capture section is required. The system consists of a W target with a flux concentrator followed by acc. structures surrounded by solenoids. The increase of the e+ bunch charge and the reduction of satellite bunches are the main issues for this system. The frequency choice of L-band is based on the larger transverse and longitudinal acceptances than those of the S-band one. The load is preferable to compose the system with compact magnets and to minimize the dip in the solenoid field. The design of the load was reported in previous work*. We understand that the Kanthal-coated cell should be confirmed in high power to confirm the feasibility at our design field of 10 MV/m level. We are making a test cavity which consists of 3 cells and one of them is composed of Kanthal-coated disks to lower the intrinsic Q value from 20000 to the order of 1000. The cavity production and the experimental result will be reported.
*Development of L-band accelerating structure with Kanthal-coated collinear load for SuperKEKB, IPAC12, THLR04.