Alexandre
Deur gave an update on the status for E97-110:
The experiment
will now run in April and May of 2003. Alexandre went
through a list of possible reasons
for the Ice cone cell production problem.
The production techniques were copied
that were used for the production of
cells for A1n
and g2n. The result was a 46 hour lifetime
cell called Phubar.
See the slides from Alexandre's talk
for more detailed information.
There are three
good unused standard cells for two experiments, and 2 good
Ice cone cells. C1720 cells
will be reserved for SAGDH, and the best GE180
cells will be used for Duality.
Al Tobias brought two GE180 Ice cone reference
cells. But two GE180 standard
reference cells need to be made, as well as
C1720 Ice cone and standard reference
cells.
Al Tobias
gave an update of the UVa target system:
Three Ice cone cells have been filled
since the last meeting, but the first
one failed when
the pumping chamber cracked during the pull-off. A new
holder was made
to improve the pull-off. Al discussed the changes made that
are believed
to have improved the cell production status.
Al
Gavalya discussed the design status:
Joyce Miller is making modifications to the collimators and sieve slits.
Modifications
need to be made for the gradient coil supports to eliminate
interferences.
Patricia Solvignon
reported on target tests:
Patricia gave
a summary of the standard and ice cone cell performance
characteristics. Duke will be
the first cell used during the Duality running
period. Duke has a lifetime
of 53 hours and a max. polarization close to 47%.
A new ice cone cell made at W&M,
Veronica, had a max. polarization of ~ 24%
without optimization.
Vincent Sulkosky
discussed the target lab status:
From the lifetime
and AFP loss tests from different parts of the cell, there was no
significant difference in the cell
lifetimes or AFP losses.
Vince presented
the results from the wall thickness measurements on Exodus and
Veronica. Exodus was sent to
UVa to be characterized.
Results from
a crude field map in the target lab were presented. No significant
gradients
were found.
Todd Averett
gave an update of the W&M target system:
The most recent
cell made was Veronica with a lifetime of 23 hours. The next cell
will
be a GE180 40 cm cell with a small
sphere attached to the string. For the most recent cell,
Todd used a cooler torch to chase
the Rb.
Todd showed
the images from the glass samples that were taken with the Atomic
Force Microscope. The images
need to be gone through, and conclusions need to be
drawn about what is being seen on
the glass surface.
Other issues
and Manpower were discussed:
The beam quality
is a major issue for the experiment. New harps have been installed
in the Hall A line, but they have
not been connected. It is hoped that a few days will be
available to test Hall A and C beam
together before the Christmas break. Aluminum
covers maybe added to the ladder to
prevent it from melting if the beam position is off.
Todd Averett
will also provide Nilanga with a Helium-4 lecture bottle to test the
reference cell system for leaks.
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