Résumé du preprint Irfu-09-175

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Irfu-09-175
Low-voltage electro-polishing of SRF cavities
F. Eozénou, Y. Gasser, J.P. Charrier, S. Berry, C. Antoine
First promising results concerning Electro-Polishing at lower voltage of 5 V (abbreviated as LV-EP) has previously been reported [1, 2]. This effort is being pursued and a 1-cell Tesla shape 1.3 GHz cavity has been dedicated to LV-EP and has reached improved gradient exceeding 39 MV/m. Furthermore, a second cavity has been alternately treated with standard Electro-Polishing (abbreviated as EP) and low-voltage EP. It did not encounter any decrease in performance after LV-EP. This process is then promising for the treatment of large cavities for proton applications. Moreover, long-time EP experiments on niobium samples show that high-voltage EP is more likely to generate impurities in the EP mixture that might contaminate niobium surface. Some results will also be presented concerning efficient field emission removal by chloroform rinsing of 1-cell cavities.