Improved prototype cryomodule for the CEBAF 12 GeV upgrade

Author

Daly, E.F. ; Campisi, I.E. ; Henry, J. ; Hicks, W.R. ; Hogan, J. ; Kneisel, P. ; Machie, D. ; Reece, C.E. ; Rothgeb, T. ; Sekutowicz, J. ; Smith, K. ; Whitlatch, T. ; Wilson, K.M. ; Wiseman, M.

Author_Institution

Thomas Jefferson Nat. Accel. Facility, Newport News, VA, USA

Volume

2

fYear

2003

fDate

12-16 May 2003

Firstpage

1377

Abstract

In order to provide a higher performance building block cryomodule for the CEBAF 12 GeV upgrade, modifications have been made to the design of the Upgrade Cryomodule. The prototype cryomodule will be completed in 2004 and be installed for operation in CEBAF. Design changes enable the use of higher gradient cavities to achieve greater than 100 MV per cryomodule while not exceeding the budgeted cryogenic load of 300 W during steady-state operation. They also include refinements based on experience gained during the construction of the first generation upgraded cryomodules as well as the prototype cryomodule for the Spallation Neutron Source. Two cavity designs will be used in the prototype, one optimized for E_peak/E_acc ratio, and the other optimized for minimum cryogenic load. The input waveguides, thermal shield and piping have been redesigned to accommodate the higher expected heat loads. The vacuum connections consist of niobium-titanium flanges, aluminum-magnesium seals and stainless steel clamps to provide reliable UHV sealing. The cavity tuner features one cold motor and two piezoelectric actuators to provide coarse and fine tuning respectively.

Keywords

accelerator cavities; beam handling techniques; cryogenics; electron accelerators; linear accelerators; particle beam dynamics; piezoelectric actuators; waveguides; 12 GeV; 300 W; CEBAF; UHV sealing; Upgrade Cryomodule; aluminum-magnesium seals; cavity designs; cavity tuner; cold motor; cryogenic load; fine tuning; heat loads; higher gradient cavities; improved prototype cryomodule; niobium-titanium flanges; piezoelectric actuators; piping; refinements; stainless steel clamps; steady-state operation; thermal shield; vacuum; waveguides; Cryogenics; Design optimization; Flanges; Loaded waveguides; Neutrons; Niobium compounds; Prototypes; Steady-state; Thermal loading; Titanium compounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289711

Filename

1289711