Petersen B.

Paper	Title	Page
TUP30	Update on Cavity Preparation for High Gradient Superconducting Multicell Cavities at DESY	196
	B. vanderHorst, A. Matheisen, B. Petersen, S. Saegebarth, P. Schilling DESY Hamburg
	For the proposed XFEL Project at DESY about 850 Cavities will accelerate the electron beam. The resonators have to provide average acceleration gradient of 23, 6 MV/m [Ref.:1]. In order to reach that gradient reproducibly in a medium scale production, several preparations methods and surface treatments are under study at DESY. Beside the standard fine grain niobium material in use up to now, nine cell resonators made from large grain niobium are under investigation since 2006. We present the different approaches in surface preparation procedures for fine and large grain niobium and the related cavity results.
TUP31	Update on EP Experiences at DESY with the Electro Polishing Process at DESY 1.3 GHZ	200
	M. Schmoekel, A. Matheisen, B. Petersen, N. Steinhau-Kuehl, H. Weitkamper DESY Hamburg
	Since several years electro-polishing (EP) of superconducting resonators is one of the major preparation techniques in use for high gradient superconducting resonators. At DESY the EP facility is operational since mid of 2003. About 150 resonators have been polished in this infrastructure since. Typical process data, a maintenance plan and reliability of components installed in the DESY apparatus as well as actual RF test results of resonators will be presented. For the XFEL project the industrialization of the electro polishing processes is started. A status report of the industrialization will be given.
TH201	Industrial Study of FLASH Module Production
	B. Petersen DESY
	The cryomodules of the FLASH linac at DESY represent the development of the cryomodule design of the TESLA Technology Collaboration. Beside of the use in the FLASH linac, the cryomodule design and construction serve as a generic approach for other projects. In particular, the industrial production of the cryomodules of the European XFEL-project will be based on the FLASH cryomodule development. To prepare for the construction of the European XFEL and other superconducting linac based light sources like the BESSY-FEL, the existing FLASH cryomodule design and assembly procedures are reviewed by means of industrial studies. The aim is to prepare for series production, as well as to reduce the effort and costs and to increase the performance and the reliability. As a result of a European negotiated procurement procedure, two European companies were qualified to take part in the studies. The ACCEL Instruments GmbH and the Babcock Noell Nuclear GmbH (BNN) took part in the complete assembly the cryomodule production No.6 at DESY in May/June 2006. Both companies will also be involved in the assembly of cryomodule No.8 in fall 2007. The present status of the studies and first results are reported. The industrial studies are supported by the EUROFEL Design Study contract No.011935.
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