3.9 GHZ superconducting accelerating 9-cell cavity vertical test results

Author

Khabiboulline, Timergali ; Cooper, Charles ; Dhanaraj, Nandhini ; Edwards, Helen ; Foley, Mike ; Harms, Elvin ; Mitchell, Donald ; Rowe, Allan ; Solyak, Nikolay ; Moeller, Wolf-Dietrich

Author_Institution

FNAL, Batavia

fYear

2007

fDate

25-29 June 2007

Firstpage

2295

Lastpage

2297

Abstract

The 3rd harmonic 3.9 GHz accelerating cavity was proposed to improve the beam performance of the FLASH (TTF/DESY) facility [1]. In the frame of a collaborative agreement, Fermilab will provide DESY with a cryomodule containing a string of four cavities. In addition, a second cryomodule with one cavity will be fabricated for installation in the Fermilab photo-injector, which will be upgraded for the ILC accelerator test facility. The first 9-cell Nb cavities were tested in a vertical setup and they didn´t reach the designed accelerating gradient [2]. The main problem was a multipactor in the HOM couplers, which lead to overheating and quenching of the HOM couplers. New HOM couplers with improved design are integrated in the next 9-cell cavities. In this paper we present all results of the vertical tests.

Keywords

accelerator cavities; beam handling techniques; cryogenics; 9-cell Nb cavities; FLASH facility; Fermilab photo-injector; HOM couplers; cryomodule; frequency 3.9 GHz; superconducting accelerating 9-cell cavity; vertical test results; Acceleration; Collaboration; Couplers; Electric breakdown; Electromagnetic fields; Life estimation; Particle beams; Radio frequency; Test facilities; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4441228

Filename

4441228