3.9 GHZ Superconducting Accelerating 9-Cell Cavity Vertical Test Results.

Khabiboulline, T. ; Cooper, C. ; Dhanaraj, N. ; Edwards, H. ; Foley, M.

Technical Information Center Oak Ridge Tennessee

关键词: Superconducting cavity resonators;    Accelerators;    Beam dynamics;    Fermilab tevatron;    Fabrication;   

RP-ID  :  DE2007917871

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The 3rd harmonic 3.9 GHz accelerating cavity was proposed to improve the beam performance of the FLASH (TTF/DESY) facility. In the frame of a collaborative agreement, Fermilab will provid e 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. 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.