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Results of R&D Programmes and LP&CW EXFEL Cryomodule Tests in the Period from 2005 to 2023
J. Sekutowicz, D. Proch, J. Eschke +14
In 2005 and 2006, we began to consider the feasibility of long-pulse (LP) and continuous-wave (CW) operation for the E-XFEL. The operation modes considered were assumed to be compl…
Cathodes and Shape Modification of Cavity for DESY Superconducting Photoinjector
J. Sekutowicz, D. Bazyl, E. Vogel +8
Four DESY prototypes of the L-band superconducting RF photoinjector cavity demonstrated on-axis peak gradients above 55MV/m during multiple vertical cryogenic tests. Two of these p…
Further improvement of medium temperature heat treated SRF cavities for high gradients
L. Steder, C. Bate, K. Kasprzak +4
The application of heat treatments on 1.3 GHz TESLA type cavities in ultra-high vacuum at 250°C to 350°C is called medium temperature or mid-T heat treatment. In various laboratori…
Correlation of srf performance to oxygen diffusion length of medium temperature heat treated cavities
C. Bate, K. Kasprzak, D. Reschke +5
This comprehensive study, being part of the European XFEL R\&D effort, elucidates the influence of medium temperature (mid-T) heat treatments between 250°C and 350°C on the perform…
High gradients at SRF photoinjector cavities with low RRR copper cathode plug screwed to the cavity back wall
E. Vogel, J. Sekutowicz, D. Bazyl +13
In recent years we increased the typical maximum peak field on axis gradients obtained in L-band superconducting RF (SRF) photoinjector cavities at vertical tests to around 55 MV/m…