Résumé du preprint DAPNIA-04-12

Improved surface treament of the superconducting Tesla cavities (TESLA 2004-04)
L. Lilje, A. Matheisen, D. Proch, D. Reschke, D. Trines, C. Antoine, J.P. Charrier, H. Safa, B. Visentin, C. Benvenuti, D. Bloess? E. Chiaveri, L. Feirreira, R. Losito, H. Preis, H. Wenninger, P. Schmüser.
The proposed linear electronpositron collider TESLA is based on 1:3 GHz superconducting niobium cavities for
particle acceleration. For a centre-of-mass energy of 500 GeV; an accelerating field of 23:4 MV=m is required which is
reliably achieved with a niobium surface preparation by chemical etching. An upgrade of the collider to 800 GeV
requires an improved cavity preparation technique. In this paper, results are presented on single-cell cavities which
demonstrate that fields of up to 40 MV=m are accessible by electrolytic polishing of the inner surface of the cavity.
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