Development of HOM damper for B-factory (KEKB) superconducting cavities

Author

Tajima, T. ; Asano, K. ; Furuya, T. ; Izawa, M. ; Mitsunobu, S. ; Takahashi, T. ; Gamo, N. ; Iida, S. ; Ishi, Y. ; Kijima, Y. ; Kokura, S. ; Kudo, M. ; Sennyu, K. ; Tachibana, S. ; Takashina, H. ; Taniyama, N.

Author_Institution

Nat. Lab. for High Energy Phys., Ibaraki, Japan

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1620

Abstract

Higher order mode (HOM) power excited in superconducting cavities can be on the order of kW in the B-factory due to high current. To extract this power, cavities are designed so that HOM can travel out through beam pipes and be absorbed in a lossy material. Ferrite has been investigated as a candidate material for the absorber. Due to its low tensile strength, bonding of tiles has been a problem. To solve this problem, we started R and D on the sinter-bonding of ferrite powder directly on the inner surface of a copper pipe using hot isostatic pressing. In this paper, we describe the manufacturing process, low power test, high power test and outgassing rate measurement of the manufactured dampers

Keywords

accelerator cavities; adhesion; copper; electron accelerators; powder technology; sintering; storage rings; superconducting cavity resonators; Cu; Cu pipe; Fe-O; HOM damper; KEKB; ferrite powder; high power test; higher order mode damper; hot isostatic pressing; low power test; outgassing rate; sinter-bonding; superconducting cavities; tiles; Bonding; Copper; Ferrites; Manufacturing processes; Powders; Pressing; Research and development; Superconducting materials; Testing; Tiles;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505306

Filename

505306