Present: Chris Allgower, Andy Bacher, Jack Doskow, Anders Gardestig Hermann Nann, Tom Rinckel, Paul Pancella, Ed Stephenson
Meeting came to order at 1:20 pm.
Stephenson reported that Jack Rapaport has some end-of-year money he would be willing to spend on the Cooler-CSB project. Ideally, he could buy some necessary piece of hardware, perhaps part(s) of the luminosity monitor system. We should also check on our electronics inventory, in considering how to use this money.
SEPTUM MAGNET
The new upper coil has been wound and baked. Water fittings are now being soldered, and temperature switches are yet to be attached. It should be possible to reassemble and resume mapping this magnet by about March 19. That is the start of at least a week of Cooler access, but the schedule beyond that remains soft.
TARGET BOX
Rinckel and Doskow have now gone over the design thoroughly, and parts drawings are nearly complete. Jack plans to complete the 2-dimensional assembly drawing in the next day or two, at which time the design can be turned over to Walt Fox in order to prepare a bid package for the main welded assembly. New calculations of the weights of both the existing box and the new one indicate that handling them with the existing half-ton crane should not be a problem.
POLARIMETRY TEST RUN SUMMARY
Pancella gave a summary of the recent run with deuteron beam and the PINTEX detector system. We were successful in achieving our goals and then some. The detector system worked well and promptly, and hundreds of micro-amps of deuteron beam was stored without too much problem. Accelerator and source performance was very stable over five days, and there was apparently no beam depolarization in any of the accelerators.
It was possible to have online cuts and conditions which gave a clean sample of dp events to analyze. The expected distributions in azimuthal angle were appaarent in less than an hour of data taking. The analysis of the Cooler beam gave polarizations which agreed pretty well with measurements made by the lower energy polarimeter before CIS, within the uncertainties of calibrating analyzing powers at both energies. We probably have enough data to measure the scattering angle dependence of the analyzing powers, as a further check of the apparatus.
There were varying amounts of background from beam halo hitting the aluminum storage cell. It appeared that the beam was either skewed wrt the cell axis, or much larger than a well-cooled beam should have been. There seemed to be some instabilities in the beam related to cooling which showed up as large variations in trigger rate with frequency like a Hertz. It will probably be necessary to use a cell with larger diameter when we do this for real. Assembling such a cell should be straightforward, as we do not require its walls to be especially thin, nor any special coating.
There is every indication at this time that the PINTEX system can be run in parallel with the dd -> alpha pi experiment to provide accurate calibration of the beam polarization, as desired.
ELECTRONICS AND LEAD GLASS
Allgower notified us that his report on the lead glass detector setup is complete and available on the web site, if anyone wants to have a look. He also showed a recently completed electronics diagram (xfig), most of which is already cabled up.
NEAR FUTURE
We will not meet this Thursday, as both Ed and Chris will be out of town. Our next meeting will be Thursday, March 1, at the regular time. We should take that opportunity to revisit the job list, update where necessary and make sure the critical jobs have names attached and progress occurring.
We were reminded that Anders will give a theory talk here at noon this Thursday which should have application to this experiment.
The meeting adjourned at about 2:25 pm.