[g2p_ana] g2p/GEp Status update

K Slifer slifer at jlab.org
Fri Oct 28 13:55:36 EDT 2011


Dear Colleague,

As you know, the polarized target magnet was damaged during a recent quench.
 The target group has advised to replace the coil package with the similar
helmholtz set from Hall B, and we are very pleased to report that this
request has been approved.

Given the target group's estimates, we anticipate that E08-027 can reach all
physics goals at four of the (originally planned) five Q2 bins.  E08-007 can
complete the low Q2 measurement of GE/GM but loses the planned overlap with
previous measurements at large Q2.  We are somewhat fortunate that the
jeopardized kinematics required a disproportionately large number of
 calendar days due to the drop in scattering rate at larger angle, and the
time required to remove the septa magnets and reposition the target.

The schedule is naturally still in flux, but we expect it's likely that the
beamline and detector commissioning will commence in *December* in order to
reduce conflicting with the target installation.   This leaves little time
to finalize and checkout all subsystems,  so we want to encourage you to
please keep your preparations on schedule.

thanks for your continued interest and support of these two experiments!

-Karl, for the spokesmen of g2p/GEp



---------------------------------------
Karl Slifer,  UNH
Assistant Professor
Tel: 603-722-0695

2011 Fall Semester Address
Jefferson Lab,  MS12H4
12000 Jefferson Avenue
Newport News VA,  23606
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