CERN Accelerating science

Article
Title	Beam Physics for the 12 GeV CEBAF Upgrade Project
Author(s)	Merminga, Lia ; Benesch, Jay ; Bogacz, S A ; Chao Yu Chiu ; Freyberger, Arne ; Grames, Joseph M ; Harwood, Leigh ; Kazimi, Reza ; Krafft, Geoffrey A ; Spata, Michael ; Tiefenback, Michael ; Wiseman, Mark ; Yunn, Byung C ; Zhang, Yuhong
Affiliation	(Jefferson Lab, Newport News, Virginia)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1482
Subject category	Accelerators and Storage Rings
Abstract	Beam physics aspects of the 12 GeV Upgrade of CEBAF are presented. The CEBAF Upgrade to 12 GeV is achieved via 5.5 recirculations through the linacs, and the installation of 10 new high-gradient cryomodules. A new experimental hall, Hall D, is envisioned at the end of North Linac. Simulation results for straight-through and recirculated injectors are summarized and compared. Beam transport designs are discussed and evaluated with respect to matching and beam breakup (BBU) optimization. Effects of synchrotron radiation excitation on the beam properties are calculated. BBU simulations and derived specifications for the damping of higher order modes of the new 7-cell cavities are presented. The energies that provide longitudinal polarization in multiple experimental halls simultaneously are calculated. Finally, a detailed optics design for the Hall D transport line has been obtained.