[Jlab-seminars] Physics Seminar: Friday Nov. 30th 11am CC Auditorium

[Douglas Higinbotham]

CEBAF Center Auditorium 11am Friday Nov. 30th

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Simultaneous Four-Hall Operation for 12 GeV CEBAF

Reza Kazimi
Jefferson Lab

Under the present CEBAF design, there is no option for sending beam to all four halls simultaneously. With addition of the new Hall-D to the existing three halls, at least one hall has to stay down during the machine operation. In this seminar, a design that can give the option of running beam to all four CEBAF halls simultaneously will be introduced. The new design presents only a minimal change to the existing CEBAF extraction system. In fact all the lower pass extractions will stay as they are and only the 5th pass horizontal RF separator will change frequency. However, in order to make room for the new hall D beam among the existing three beams the beam frequency will be 250MHz, for any of the original CEBAF halls receiving 5th pass beam (and Hall-D as well) while Hall-D is receiving beam. This and other details will be presented and discussed.