Privacy and Security Notice
Archived Messages for HALLA_MIN_1996@cebaf.gov: Minutes
Minutes
John LeRose (lerose@CEBAF.GOV)
Thu, 09 May 1996 12:24:15 -0400
Minutes of Hall A Group Meeting 7 May 1996
I. John Hogan got married on Saturday. Congratulations John!
II. Announcements:
A. Everyone having their way paid to PANIC can expect to be asked to
volunteer to help out with the conference (chairing sessions etc.)
B. Main purpose of today’s meeting is to evaluate readiness for the May run.
III. Engineering: (Bill Schneider)
A. Vacuum:
1. Upper box being worked on
2. Dipole-Q3 installed
3. Q1-Q2 ready to go in
4. Q2-Dipole in position. Spool piece must be installed.
a) Slight problem with installation of Hall probes in Q1/2,
probe wants to enter vacuum box from the outside when
there’s no access to the inside. Will have to remove cable
from connector and resolder. Not a big deal.
B. Rails are in place. Need to be shot into position and welded.
C. Hope to lift the detector by the end of the week.
IV. Magnet Monitoring and measuring: (John LeRose)
A. Working up QDQ optics for May run
B. Meeting Thursday and Friday (9-10 May) in the Residence Facility to
review QMM and ARC
C. Meeting Saturday (11 May) L104 re septum magnet.
V. Calibrations: (Eddy Offermann)
A. THE COLLIMATOR BOX HAS ARRIVED!!
1. Ready for mounting on Q1
2. Contact Eddy before any lifting. Not all the bolts are tightened.
3. 2nd Box needs 40-50 hours of work to complete.
B. Will make a checklist of things to do during the May run in consultation
with John LeRose and Bogdan Wojtsekhowski.
VI. Beamline: (Arun Saha)
A. Question re beam we need in May: CW vs. pulsed? CW is preferred but not
critical. Want 5-10 microamps average current.
B. Beamline is basically in order
C. Optics studies show that 2 BPM’s need repair. That’s being done.
D. Details of results of optics studies next week. Looks good.
E. Agreement reached with U.Va. re disposition of outstanding tasks related
to the Target Chamber.
F. Anyone who would like dosimetry measurements at some particular place
in the Hall should contact Arun.
VII. Cryotarget: (Jian-Ping Chen)
A. Held preliminary review of design last Friday (3 May). Minutes have been
distributed. Anyone else who wants a copy should contact Jian-Ping.
B. Manufactured more beer cans using the hydraulic punch. Quality is as good
or better than SLAC’s.
C. Expect genuine high power test of the Hall C Target in the next 2 weeks.
(4 pass greater than 100 microamps)
VIII. Documentation and Møller Dipole: (Sirish Nanda)
A. Working on TOSP for May run
B. Procurement is working on details of the contract for the removal of the
Møller Dipole at Los Alamos. Expect to get the work done in late May or
early June.
C. There is a need for experimenters to become certified experts in the
operation of various parts of the spectrometer systems in order to run
things both during data taking runs and during beam off activities (e.g.
magnet power supply and cryogenics service operations, various specific
aspects of the detector system, target systems operations, etc.) interested
people are urged to contact Sirish so they can get the appropriate training
and or certification.
IX. Controls: (Javier Gomez)
A. Can now communicate with Lakeshore power supplies.
B. Working on NMR’s and Dynapower Power Supply (Dipole)
C. Converter for Fug Power supplies (Q2/3) due in tomorrow.
D. Questions from L. Cardman:
1. Will we be able to run in a limited but satisfactory way for the May
run? Yes, in a limited way.
2. Do you need any extra help from Chip Watson’s group or
anywhere else? Not really.
a) Bill Schneider will try to get Javier some assistance from Ed
Stitts.
X. Detectors: (Bogdan Wojtsekhowski)
A. Estimates will require 14 hours to checkout detectors after installation of
AC power to detector frame in the hut.
B. Discussions underway with U.Md. re amplifiers for shower counters.
C. Observed problem with scalers. They don’t like hot weather. Fortunately
the hut will have AC.
D. Mark Jones has taken over the VDC high voltage remote controls.
E. Started pulling cables to the detector hut.
F. Rail extension design is underway.
G. Automatic logbook is functioning (Thanks to Mark Jones)
H. Problem with one PMT appears to be a bad cable. (Amplitude occasionally
drops by a factor of 2)
I. 2nd student from MIT will be here at the end of May.
J. Hadron arm S1S2: Maja Offermann shows various TDC and ADC spectra.
Preliminary results not fully understood.
K. Ed Brash review timing situation:
1. We seem to be getting what we wanted from our design choices.
2. Possibility to use beam microstructure raised and discussed briefly.
XI. New student arrival working for U. Regina, Andre Fleck.
-JJL