I. Future meetings will be held on Tuesdays at 13:30
II. New students and post-doc’s on site:
A. Nilanga Liyanage: from MIT, working on VDC hardware, trigger software (investigating unexplained
background in TOF spectra.
B. Christoph Jutier: from ODU, working on the cryotarget.
III. Larry repeats need for MOU status reports. Some have turned theirs in others have not.
A. Bogdan’s format is OK.
B. Question re MOU for waterfall target.
1. MOU exists. Can get copy from Mike Syptak
2. Eddy Offermann will make status report and is to be Hall A contact for this project.
IV. Larry reports on negotiations to get human resources help from Accelerator Division with Hadron arm installation.
A. Looks highly promising that we’ll get significant incremental help
B. We’ll believe it when we see it
V. Dialog underway with Saclay to send a representative to CEBAF to oversee power supply controls changes for Q1
VI. Engineering: (Bill Schneider)
A. GOOD NEWS: The weather is nice today!
B. BAD NEWS: Cryogenics control problems persist
1. Meeting yesterday (4 March) with Accelerator Division: six action items named
2. System failed again this morning. Details of problem discussed.
C. Tried to put the doors on the spectrometer today (5 March)
1. Inserted halfway then got stuck. Maybe an alignment problem.
2. Problem now is getting it unstuck
D. Making progress on target chamber. O-ring grooves polished by U.Va. (Thanks for help!).
E. Due to Cryo control problems Age Visser visit delayed until 1 April
F. LCW should be completed this week. Will begin tests of power supplies without inductive load.
VII. Calibrations: (Eddy Offermann)
A. Short Range correlations workshop 15-16 March. Final list of speakers will be sent around.
B. Reported on latest modifications to ESPACE
1. Assorted algorithms being developed
a) Paul Ulmer has agreed to supply software for automating the TDC offset calibrations
and time to distance calibrations
2. Can be downloaded from WWW
C. Question from Mike Finn. What is histogram storage space available? 128 MB without swapping.
VIII. ATM’s: John Domingo reports that ATM’s acquired from SSC are useless. Old model no longer supported by
manufacturer.
IX. Controls: (Javier Gomez)
A. met with Dale Ouimette and he has agreed to build 2 SEE BPM trigger boards for us. We won’t need
them before September
B. met with Chip Watson. Accelerator wants to use our BPM codes. In return they will supply 1-2 people to
write code for us starting now. Tasks include:
1. solid target
2. install SEE BPM’s software
C. Fug (Q2/3) power supply problems:
1. have no documentation on software control protocols
2. Excel (Siemens) is asking $7200 to supply documentation
3. Have compiled Pascal code can run power supply from standalone PC. This will work for April.
X. Beamline: (Arun Saha)
A. Question to Bill Schneider: When will bench for 2 BPM’s, 1 or 2 beam deflectors, and current monitors
be installed? Bill Says everything is ready to be handed over to Accelerator for installation.
B. Dick Lindgren was here last week working on scattering chamber
1. will return later this week with more parts
2. When he arrives will need to review and make sure all parts are accounted for and nothing has
been left out.
C. Beamline completed up to the shield wall.
D. After the shield wall awaits installation of bench (see above)
E. Dump will have water for April
F. Question for Bill Schneider: Do we need to pressure test fixed ports on the target chamber? Yes, and we
have all the necessary equipment and will perform the tests before April.
G. Summary: Beamline installation is progressing at or ahead of schedule.
XI. Chamber Gas System: (Howard Fenker)
A. Question: Is Cerenkov gas part of Howard’s charge? No.
B. Spawned discussion of CO2 system for Cerenkov’s
1. Bottle for refill after purging will be inside.
2. Bottle for slow flow (normal operation) will be outside
C. Concern expressed re slope of concrete pad which could cause a tipping problem with bottles. Bill
Schneider says that if it becomes a problem he will fix it.
D. Question: When does Bogdan want gas flow? 1 June, will use temporary system with pre-mixed gasses in
the Hall for April.
XII. Detectors: (Bogdan Wojtsekhowski)
A. Discussed need for temperature monitoring to protect sensitive electronics.
B. Detector Frame Lift is critical item:
1. Detectors are ready
2. need rails installed
3. Expect draft plan on critical lift will be ready next Monday (11 March)
C. Arun Saha requests detailed layout of detector package as it now exists (correct dimensions etc.).
1. This is already on the list of jobs for the users. We need help!
XIII. Polarimeters and Cryotarget: (Jian-Ping Chen)
A. Møller:
1. Quadrupoles: All four mapped and ready for shipment to Ky.
2. Dipole progressing more slowly.
a) making tools and fixtures for extraction
b) will ship quads and dipole together to Ky.
B. Compton: 3 people from French Collaboration will be at CEBAF the week of 18 March.
C. Cryotargets
1. Report on developments with Hall C target. During cooldown of the top H2 loop a rupture disk
ruptured. Observing cooldown processes are a good learning experience for us.
2. N heat exchanger is here
3. Design issues:
a) Have been meeting with Paul Brindza
b) Setting up a meeting next Friday (8 March) with Jian-Ping, Joe Mitchel, Bill Schneider,
Larry Cardman, and Paul Brindza to review modification options and begin to develop
priorities.
4. Sub-account for the cryotarget has been established.
XIV. Magnet mapping and monitoring: (John LeRose)
A. Still working toward resolution of UPS problem
B. Preliminary studies indicate that rotation of any single quadrupole about its axis by 10 mr or less
generates acceptably small software corrections
C. Review of colloidal suspension technique as a means to establish the magnet midplane come to same
conclusion as Jeff Martoff. Very hard to quantify without in the field tests. Depends on ability to
accurately orient the polarizing filters and the quality of the image produced by the colloids and
polarizers, which in turn depends on details of the suspension and magnetic field.
XV. DAQ: (Bob Michaels)
A. Calvin Howell (Duke) is here putting final touches on the scaler display.
B. Bob is working GEANT with CODA output. (Ed Brash’s geometry data base should be ready in a few
days)
XVI. Philosophical discussion initiated by Bill Schneider on objectives and schedule given present problems.
A. Likelihood of beam in the spectrometer diminishing rapidly as cryo-control problems persist
B. Door problems prohibit movement of the spectrometer
C. Exit beam pipe and target chamber installation held up by inability to complete door installation and
target chamber problems.
1. Could take beam in hall without these.
2. Can transport low current beam to the dump in air.
3. Would need some sort of makeshift target holder.
D. Conclusion: See how things develop this week and consider changes in plans before next Tuesday’s
meeting
-JJL