I. Collaboration Meeting 16-17 February:
A. Tentative Agenda reviewed by S. Nanda
B. long discussion about agenda
II. CC meeting 15 February:
A. L. Cardman reviewed general function of CC
B. various potential agenda items discussed
1. TC: Do we need it? What’s its future?
III. Accelerator Commissioning Schedule presented by L. Cardman
A. implications for Hall A discussed (first real shot at spectrometer operation
25 April)
B. P. Bertin requests time for ep energy measurement studies
IV. Post-Doc candidates: all physics staff should forward their short list from
the available candidate list to L. Cardman ASAP
V. Physics staff are reminded to forward their lists of jobs for Post-Docs and
students to L. Cardman
VI. Hall C Cryotarget: Hall C staff is planning to work up detailed
documentation. J-P Chen will follow developments there and
report
VII. Engineering: (B. Schneider reporting)
A. electron arm mechanically complete
1. controls finished tomorrow (7 Feb)
2. power done
3. setting up communications with CHL (J. Proffitt to meet withCHL people on
Thursday 8 Feb)
B. Have choice to make
1. The present plan is to complete the cryogenic system for the electron arm,
check it for leaks, purge it, and
then cool the magnets for electrical testing and potential operation. Then we
complete the cryo hookups
for the hadron arm, and at some point break into the main system to hookup the
hadron arm, purge it, and
then cool all magnets in parallel. The advantage was that this would get the
electron arm up as quickly as
possible.
2. The alternate approach, that will be investegated, is to complete the
plumbing of the electron arm AND
the hadron arm, purge both at the same time, and then cool ALL magnets. This
has the advantage that it
moves forward the date when we could begin to map the hadron arm and it also
moves forward the date at
which we will find out if the hadron dipole is OK.
3. Bill will review the schedule in detail and report soon.
C. Biggest struggle will be to get all instrumentation operational & checked out
D. Shield houses are essentially complete. Outstanding items include:
1. labrynths
2. doors (end of next week)
3. concrete
VIII. Controls: (J. Gomez reporting)
A. Problems with protection circuitry
1. Things that should be isolated aren’t. Need to order isolation amplifiers as
soon as we know what we
want. (Choice between optical and transformer, question re radiation hardness of
optical)
2. Things that should be protected aren’t
3. Bringing in outside help discussed
4. Interlock box for hadron dipole not yet provided by Wang NMR
IX. Detectors: (B. Wojtsekhowski reporting)
A. Scintillators ready for cosmic ray tests
B. Complete and final delivery of all systems from MIT today (6 Feb). (INCLUDING
THE OSCILLOSCOPE!)
C. FPP alignment: studies indicate that 0.25deg relative alignment between the
chambers is needed and achievable
with what we have in place.
D. Working on access problem with pre-shower counters. (can’t connect cables)
Will try to perform mechancal repair
after frame is mounted in spectrometer.
X. Polarimeters and cryotarget: (J-P. Chen reporting)
A. Møller: Work has begun at Los Alamos on clearing magnets. Target date for
completion is 20 February.
B. Cryotarget
1. getting more parts
2. re Hall C problem with support structure for lifting mechanism.
a) Redesigned/repaired but not yet tested.
b) We are making further improvements on the Hall C design
XI. Beamline: (A. Saha reporting)
A. Working on scattering chamber windows
B. Fixed port aperture will cover out to 20deg. Will work for 16deg.
C. Schedule for beamline installation is being prepared
D. Will report next time on performance parameters of the solid target actuator.
E. Not clear if controls can be integrated into slow controls by April, will
try. Will work independently anyway.
1. J. Gomez points out need for a brake and limit switches
2. Everything will be tested by the end of this week
F. Question from E. Offermann: Do we have camera(s) to look at the target?
1. We don’t have in hand but Arun will get something
2. L. Cardman says there may be some surplus from Illinois available on site (B.
Schneider will check)
XII. Spectrometer simulations: (E. Offermann reporting)
A. Did angle reconstruction simulation for VCS. No discernable difference
between CDR and spectrometer without
multipoles.
B. If all simulations are true, then, for a broad variety of approved
experiments, spectrometer performance without
multipoles is comparable to CDR specifications.
XIII. Magnetic measuremnts and alignments: (J. LeRose reporting)
A. magnetic axes of quadrupoles:
1. Colloidal suspension should give the axis to +-200 microns (Want to get
within +-1 mm.)
2. Jeff Martoff of Temple University has been contacted and will supply
colloidal suspension target.
3. J. LeRose and B. Schneider must work out with Will Oren the details of when
and how the measurements
will be made
B. magnetic midplane of Quadrupoles:
1. Hard numbers are not available for how well this can be done with colloidal
suspension
2. +-1 mr on roll angle will guarantee no measurable effect on optical
performance. The limits of software
correctability are less clear.
3. For Q2/3 can rotate the midplane by +-12 mr with the skew quadrupole coil
a) This feature is not available on Q1’s
b) Q1 Hadron has already been field mapped and fiducialized at Saclay, but not
Q1 Electron
XIV. Collimator Box: (E. Brash reporting)
A. Rutgers machine shop is running 2 shifts/day to get the box done on time.
B. Ed will be sure that they understand that 15 March is the drop dead delivery
date.
XV. FPP: (E. Brash reporting)
A. parts should be beginning to arrive from various institutions soon
B. setting up a weekly meeting just prior to the Hall A meeting. Contact E.
Brash if you want to be included on the
distribution list.
-JJL