Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441228
