Reducing field emission in superconducting RF cavities for the next generation of particle accelerators

Author

Shu, Q.S. ; Hartung, W. ; Leibovich, A. ; Kirchgessner, J. ; Moffat, D. ; Noer, R. ; Padamsee, H. ; Rubin, D. ; Sears, J.

Author_Institution

Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1935

Lastpage

1939

Abstract

Heat treatment up to 1500°C in an ultrahigh-vacuum furnace, along with processing of cavities and temperature mapping was used to suppress field emission and analyze emitter properties. In 27 tests of one-cell 1500-MHz fired accelerating cavities, on the average the accelerating field, E_acc, increased to 24 MV/m (H_pk=1250 Oe) from 13 MV/m with chemical treatment alone; the highest E_acc reached was 30.5 MV/m. Emitter properties, efficiency of He processing, and results of the exposure of well-processed RF surfaces to various media are also discussed

Keywords

beam handling equipment; cavity resonators; electron field emission; heat treatment; linear accelerators; particle accelerator accessories; superconducting devices; 1500 C; 1500 MHz; accelerating cavities; chemical treatment; field emission reduction; heat treatment; particle accelerators; superconducting RF cavities; temperature mapping; ultrahigh-vacuum furnace; Acceleration; Chemicals; Electric breakdown; History; Iron; Life estimation; Linear particle accelerator; Niobium; Radio frequency; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133581

Filename

133581