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7295705 
Journal Article 
First High power test results for 2.1 GHz superconducting photonic band gap accelerator cavities 
Simakov, EI; Haynes, WB; Madrid, MA; Romero, FP; Tajima, T; Tuzel, WM; Boulware, CH; Grimm, TL 
2012 
1 
Physical Review Letters
ISSN: 0031-9007
EISSN: 1079-7114 
109 
16 
164801 
English 
23215084 
WOS:000309905400005 
We report the results of the recent high power testing of superconducting radio frequency photonic band gap (PBG) accelerator cells. Tests of the two single-cell 2.1 GHz cavities were performed at both 4 and 2 K. An accelerating gradient of 15 MV/m and an unloaded quality factor Q(0) of 4×10(9) were achieved. It has been long realized that PBG structures have great potential in reducing long-range wakefields in accelerators. A PBG structure confines the fundamental TM(01)-like accelerating mode, but does not support higher order modes. Employing PBG cavities to filter out higher order modes in superconducting particle accelerators will allow suppression of dangerous beam instabilities caused by wakefields and thus operation at higher frequencies and significantly higher beam luminosities. This may lead towards a completely new generation of colliders for high energy physics and energy recovery linacs for the free-electron lasers.