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<font color="#000099"><b><font color="#3333ff">Physics &
Accelerator Seminar<br>
Friday, Nov. </font></b></font><font color="#3333ff"><b>30,
2012<br>
11:00 AM<br>
CEBAF Center AUD.<br>
Cookies and Coffee 10:30AM<br>
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<pre><font color="#cc0000" face="Times New Roman, Times, serif"><big><b>Reza Kazimi
Jefferson Lab</b></big>
<b><font color="#3333ff">
</font></b></font><font face="Times New Roman, Times, serif"><big><b><font color="#3333ff">"Simultaneous Four-Hall Operation for 12 GeV CEBAF"</font></b>
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.</big>
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