Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery

Presented at the Tenth European Particle Accelerator Conference (EPAC06), Edinburgh, UK, 26-30 June, 2006 Energy Recovery LINAC (ERL) and LINAC-driven FEL proposals and developments are now widespread around the world. Superconducting RF (SRF) cavity advances made over the last 10 years for TESLA/TTF at 1.3 GHz, in reliably achieving accelerating gradients >20 MV/m, suggest their suitability for these ERL and FEL accelerators. Typically however, photon fluxes are maximised from the associated insertion devices when the electron bunch repetition rate is as high as possible, making CW-mode operation at high average current a fundamental requirement for these light sources. Challenges arise in controlling the substantial HOM power and in minimizing the power dissipated at cryogenic temperatures during acceleration and energy recovery, requiring novel techniques to be employed. This paper details a collaborative development for an advanced high-Q0 cavity and cryomodule system, based on a modified TESLA cavity, housed in a Stanford/Rossendorf cryomodule. The cavity incorporates a Cornell developed resistive-wall HOM damping scheme, capable of providing the improved level of HOM damping and reduced thermal load required.

[1]  S. Belomestnykh,et al.  Pushing the Limits: RF Field Control at High Loaded Q , 2005, Proceedings of the 2005 Particle Accelerator Conference.

[2]  S. Belomestnykh,et al.  CW Operation of the TTF-III Input Coupler , 2005, Proceedings of the 2005 Particle Accelerator Conference.

[3]  M.W. Poole,et al.  4GLS and the Energy Recovery Linac Prototype Project at Daresbury Laboratory , 2005, Proceedings of the 2005 Particle Accelerator Conference.

[4]  S. Belomestnykh,et al.  Design of the CW Cornell ERL Injector Cryomodule , 2005, Proceedings of the 2005 Particle Accelerator Conference.

[5]  M. Ferrario,et al.  Superconducting superstructure for the TESLA collider: A concept , 1999 .

[6]  Hasan Padamsee,et al.  STATUS OF HOM LOAD FOR THE CORNELL ERL INJECTOR , 2006 .

[7]  Maury Tigner,et al.  Phase I Energy Recovery Linac at Cornell University , 2002 .

[8]  D. Barni,et al.  A NEW TUNER FOR TESLA , 2002 .