[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
**March 2, 2012
CEBAF Center Auditorium
11:00AM
Cookies and Coffee 10:45AM*


*"Delivering Full Longitudinal Polarized Beam to Multiple Halls" **

Jay Benesch
Jefferson Lab *

Polarization in the three halls is often compromised as there is only 
one Wien filter to set the initial horizontal precession angle. 
Following a suggestion of R. Kazimi I have been exploring the 
possibility of placing three Wien filters, one per hall. This would ease 
experiment scheduling substantially and reduce the time needed to 
complete each experiment since 100% longitudinal spin alignment would be 
possible for any energy/pass configuration to three halls. I will 
present an overview of the current injector area and then a model of a 
Wien filter small enough to fit three on the chopping circle, discuss 
parameter studies done to date, and show a model of three Wien filters 
with three chopped beams from the master slit openings. Resources needed 
to move the work forward in FY12 and FY13 will be suggested. 
Installation of the 200keV gun and new quarter cryounit are planned for 
2015 so a decision on this idea is needed by the end of FY13 if it is to 
be incorporated in the (less disruptive) existing project.

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