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Improved surface treatment of the superconducting TESLA cavities

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arxiv physics/0401134 v1 pith:ZBRMVUI2 submitted 2004-01-27 physics.acc-ph

Improved surface treatment of the superconducting TESLA cavities

L. Lilje , C. Antoine , C. Benvenuti , D. Bloess , J. -P. Charrier , E. Chiaveri , L. Ferreira , R. Losito
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A. Matheisen H. Preis D. Proch D. Reschke H. Safa P. Schmueser D. Trines B. Visentin H. Wenninger
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classification physics.acc-ph
keywords cavitiessurfacecavitycolliderimprovedniobiumpreparationsuperconducting
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The proposed linear electron-positron 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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