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Archived Messages for HALLA_MIN_1996@cebaf.gov: Minutes
Minutes
John LeRose (lerose@CEBAF.GOV)
Fri, 29 Mar 1996 10:56:29 -0500
Minutes of Hall A Group Meeting 26 March 1996
I. Accelerator Schedule (not quite crystallized)
A. First Beam in Hall A 15-21 April
B. First Spectrometer test 14-23 May
II. PSS testing moved back from April 1-3 to April 3-5
III. X-terminals: Requests are in. Order will be placed this week. Expect to satisfy most requests
(depends on how much money is available and what kind of deal we can get)
IV. Space:
A. Computer Center are going to take over the old engineering trailer
B. Suite of offices is available in Trailer City (those interested should contact Mike Syptak)
V. Engineering: (Bill Schneider)
A. Presented and discussed new schedule (revision 53)
B. Hope to finish mounting doors this week. Doors are up but need some adjustment.
(Holding up concrete installation)
C. Beamline installation going OK.
1. Mentioned problem with solid target actuator (0.25mm non-reproducibility)
D. Electron Arm Quads are geometrically aligned to less than 1mm
E. Still no response from Siemens or Wang
F. Saclay doesn’'t want us to run the Q1 quads with the changes we have proposed. They
have provided a cost estimate of $165K to fix things. This will be discussed over the next
few days.
VI. Calibrations and Commissioning: (Eddy Offermann)
A. Collimator Box was held up at Rutgers due to a vacuum problem. Now expect it the end
of this week.
B. Have successfully analyzed GEANT simulated data (in CODA format)
C. ESPACE:
1. Encouraging people running detector tests to start using ESPACE to look at their
data
a) Will all need to get familiar with the code
b) Feedback now could avoid problems later
c) Tentative organizational meeting tomorrow (27 March)
2. Discussed if this was the code we will be using to take real data. YES! at least for
the early runs.
VII. Chamber Gas System: (Howard Fenker)
A. No real problems to report. Manpower limited.
B. ODU student has been very helpful.
C. Paul Ulmer agreed to have his student work with Howard some more.
D. Bill Schneider points out that, while there is heat and ventilation, there is no air
conditioning in the gas shed.
1. Howard will check specs to see if this could be a problem.
2. Can put in a window air conditioner if necessary.
VIII. Magnet Measuring and Monitoring: (John LeRose)
A. Parts for mounting fixed NMR probes in the dipole gaps have been completed by the
machine shop. We are in the process of assembling and installing probes in their brackets.
Should be ready to install in electron dipole by the end of this week.
B. Colloidal Suspension measurements to determine quadrupole axes scheduled for 10 April.
C. Quadrupole Midplane determination: Studies indicate that IF everything else is good
(magnetic axes aligned and target y0=0.) rotations of quadrupole midplanes relative to the
dipole midplane will produce non-midplane symmetric first order transfer matrix elements
that can be measured directly using the sieve slits and can be used to determine which
quads are rotated and by how much at the 1 mr level.
IX. Post-Doc Search: (John LeRose) Scheduling two more candidates for seminars and interviews
next week.
X. Controls: (Javier Gomez)
A. Have finished basic software for device drivers
B. Waiting for Power Supply turn-on for debugging
XI. DAQ: (Bob Michaels)
A. Working on small trigger problems
1. TDC’'s sometimes freeze up and can’'t be cleared except by turning the fastbus
crate off and on again. Hall C experience (hearsay from Dave Abbott) is that when
the units are cooled with AC as they will be in the hut this problem goes away.
2. ECL cables are getting old and pins have worn out causing connection problems.
Replacing with new cables.
B. Possible need for a spare CPU discussed.
XII. Detectors: (Bogdan Wojtsekhowski)
A. Herbert Breuer from U.Md. visiting. Working on the shower counter multiplexer.
B. Jian-Guo Zhao from MIT has come to repair the VDC for the Hadron Arm. He is working
with Nilanga
C. Electron Arm:
1. VDC’'s :
a) Alignment completed (4mils)
b) ready for lifting
c) Stationary rails on spectrometer aligned
D. Hadron Arm:
1. VDC’'s: repairing loose wire inside
2. HV and trigger installed and operational for S1 and S2
E. Need design work on connection between gas Cerenkov and detector frame.
1. Bill Schneider says Susan Esp is about to be available to work on it.
2. Suggested to make sure Al Gavalya is getting overly sidetracked by the detector
lift paper work.
F. Re ESPACE and Detector tests: Bogdan suggests daily meeting at 10 in the counting
house to review progress and problems.
XIII. Polarimeters and Cryotarget: (Jian-Ping Chen)
A. Compton: French group was here last week had several useful meetings and got a lot of
useful information.
B. Cryotarget:
1. Technician is back from SLAC. Acquired a lot of useful tools, parts, and supplies
from the NE11 target.
2. Joyce Miller has just started working on design
3. Christoph Jutier working on Temperature readout
4. Larry Cardman points out need to develop detailed schedule for the design.
5. Hall C:
a) Have installed a D recovery system
b) Third loop has developed a leak. Speculative discussion of how and why it
leaks.
C. Møller: Dipole (still inside Hall at Los Alamos) encountering cost and schedule overruns.
XIV. Beamline: (Arun Saha)
A. Beamline in general coming along OK.
B. Scattering Chamber:
1. Pressure tests on window ports completed. Creep test being planned.
2. Limit switches placed
3. Dick Lindgren (U.Va.) will be here tomorrow (27 March) to program everything
into the computer.
4. Problem of solid target wobble on rotation being checked out
C. Exit beam pipe should go in this week.
XV. Spectrometer Exit Window: Eddy Offermann reports that Bill Bertozzi has been contacted by a
Professor at a small University in Maine who is willing to work on the development of the second
generation extra thin exit window. Feeling is that this is worth pursuing but need to get clearer
picture of particulars before we commit to anything.
XVI. Parity Collaboration Meeting in late June announced by Mike Finn.
-JJL