Title :
Improvement of cavity performance by electropolishing in the 1.3 GHz Nb superconducting cavities
Author :
Kako, E. ; Noguchi, S. ; Ono, M. ; Saito, K. ; Shishido, T. ; Aune, B. ; Charrier, J.-P. ; Juillard, M. ; Safa, H.
Author_Institution :
KEK, Tsukuba, Japan
Abstract :
A steep drop of the cavity quality factor (Q0) at high electric field has been observed frequently in chemically-polished and high-pressure-rinsed Saclay cavities, even in the absence of field emission. Three single-cell cavities from Saclay were tested at KEK following electropolishing and high pressure rinsing. This treatment eliminated the steep Q0 drop, the quench field increased to an accelerating gradient of more than 30 MV/m with a quality factor above 2×1010. No dependence of the quench field on the niobium RRR was observed between RRR=200 and 320 in electropolished cavities
Keywords :
Q-factor; accelerator cavities; electrolytic polishing; superconducting cavity resonators; 1.3 GHz; Nb superconducting cavities; cavity quality factor; electropolishing; quench field; single-cell cavities; Acceleration; Assembly; Chemicals; Niobium; Q factor; Surface cleaning; Surface finishing; System testing; Temperature; Thermal conductivity;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795725
