Title :
Alignment of CEBAF cryomodules
Author :
Schneider, W.J. ; Bisognano, J.J. ; Fischer, J. ; Douglas, D.R. ; Macha, K. ; Mammosser, J. ; Oren, W. ; Preble, J. ; Robb, J. ; Wiseman, M.
Author_Institution :
Continuous Electron Beam Accel. Facility, Newport News, VA, USA
Abstract :
CEBAF, the Continuous Electron Beam Accelerator Facility, when completed, will house a 4 GeV recirculating accelerator. Each of the accelerator´s two linacs contains 160 superconducting radio frequency (SRF) 1497 MHz niobium cavities in 20 cryomodules. Alignment of the cavities within the cryomodule with respect to beam axis is critical to achieving the optimum accelerator performance. This paper discusses the rationale for the current specification on cavity mechanical alignment: 2 mrad (RMS) applied to the 0.5 m active length cavities. We describe the tooling that was developed to achieve the tolerance at the time of cavity pair assembly, to preserve and integrate alignment during cryomodule assembly, and to translate the alignment to appropriate installation in the beam line
Keywords :
beam handling equipment; cavity resonators; electron accelerators; linear accelerators; low-temperature techniques; 0.5 m; 1497 MHz; 4 GeV; 4 GeV recirculating accelerator; CEBAF cryomodule alignment; Continuous Electron Beam Accelerator Facility; Nb; active length cavities; beam axis; beam line; cavity mechanical alignment; cavity pair assembly; current specification; linacs; optimum accelerator performance; superconducting radio frequency 1497 MHz niobium cavities; tolerance; Acceleration; Assembly; Beam steering; Electron accelerators; Electron beams; Extraterrestrial measurements; Linear accelerators; Niobium; Particle beams; Radio frequency;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309509
