February 4, 1997
(http://www.cebaf.gov/halla/minutes/minref.html)
· General Issues (Kees DeJager)
· PAC 11 Results for Hall A:
· PR-96-001 Recoil Polarization in eta
production: approved for 26 days
· PR-94-021 The Electric Form factor of the
neutron: approved for 14 days
· Bad news, cryogenic supply failure for Hall A
magnets. According to Folts, it will take 2 weeks
to fix and cool down the magnets. Just in time for
the commissioning run.
· Field measurement in the Cherenkov detector
area
cannot be done before the run.
· Kees will be absent from the lab from Feb 5 to
Feb
9th; Larry Cardman will be in charge in his
absence.
· Eddy Offermann is leaving Hall A. Until a
replacement is found W. Boeglin, B. Michaels, P. Ulmer
will share Eddy's data analysis and commissioning
responsibilities.
· Bill Schneider has moved on to take on his new
responsibilities in the polarized source group.
Hall A and C mechanical/design engineering have
been merged into one group with Paul Brindza
leading the effort. Paul's activities will be
jointly coordinated by Kees and Roger. Javier will
supervise Jack Segal and James Proffitt. Ed folts
will be the coordinator for Hall A
installation/operations activities reporting to
Kees.
· Commissioning: (Eddy Offermann)
· Multiple foil target setup is being installed
in
ESPACE for the next run.
· Detectors: (Bogdan Wojtsekhowski)
· Delay lines for the Hadron arm will be
installed by
next week. The electron arm will follow 2 weeks
later. · Gas leak in the cherenkov det. is
fixed now.
· Rutt: FPP Straw chambers making good
progress. Most bad wires and mis-connections
have been fixed. The scaffolding is coming
out next week.
· Maya: Aerogel detector cabled up. Will be
installed in the hadron arm in two weeks.
·
· Moeller Polarimeter: (Sirish Nanda)
· The moller quadrupoles have been tested for
water
flow and insulation successfully.
· Quads are being moved to the machine shop for
further work in preparation for installation.
· Victor and Roman from Kharkov on site. They
will be
working on installation and commissioning of the
Moller target during their stay.
· U. Ky. reports that re-fabrication of the shielding
insertion with AISI 1006 steel has begun at the
Cincinnati shop. should be done in a week or so.
· Installation planning meeting in Cebaf Center L207
at 9:30 this Friday
· Beamline: (Arun Saha)
· Be and Kapton window material for the new
waterfall
target can has been ordered. Should be on site end
of the week.
· Pascal is preparing a cost update for the ARC
scanners.
· Radiation monitoring is being planned for the coming
run.
· Lindgren: Presented a proposed design for a
general
purpose stand for non-magnetic detectors. The
stand will be a refurbished Hall B surplus stand
and can carry 10 Tons. UVa would do the shop work
for the refurbishing.
· Cryotarget: (Jiang-Ping Chen)
· Gas platforms installed in the Hall, thanks to
Gavalya's coordination.
· Gas tanks are installed. Gas panel work in
progress
· Riad has checked out the temperature readout
controls and prepared sensors for cold test.
· Software knowledge-transfer from Fraser Duncan is in
the process.
· Power cable pull for the Moller/compton power
supplies completed. cable trays will be added
later.
· Data Acquisition: (Bob Michaels)
· Trigger and Data Acq. Meeting held last
Saturday:
· Dave Abbott gave update on CODA 2.
· John Calarco reviewed the coincidence trigger
scheme
A pulser test of the coinc. trigger flanned for
late Feb. · Tim Smith (UNH) will be helping out with the
ongoing
upgrade of DAQ Computers to CUE.
· Hadron Trigger: (Meme Liang)
· Working on ESPACE data base optimization
· MLU tests for hadron trigger planned for next
week.
· Control System: (Javier Gomez)
· James Proffit Reporting...
· The hadron dipole was successfully operated
at 1100 A.
· Slowing down the discharge ramp-rate to 0.1
A/s initially was the key to a controlled
discharge.
· The magnet was stable at about 10-5 level
after two hours
· Field regulation via NMR read-out and software loop
will help cut down the wait time.
· 1100 A should correspond to 3 GeV/c, Sirish
adds.
· Sieve slit controls are in progress with lower
priority. May still have to be run manually for
the coming run.
· Annuncements:
· Richard Lindgren: UVa has a NSF grant for HS
teachers working at Jefferson lab. Interested
parties should contact him
· Pierre Bertin: There will a meeting on Photon
Calorimeter for real and virtual compton
scattering experimets, tomorrow at 9:30 in VARC
47.
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