Present: Chris Allgower, Andy Bacher, Anders Gardestig, Chris Lavelle, John Olmsted, Hermann Nann, Tom Rinckel, and Ed Stephenson
The normal meeting time has been shifted to Mondays at 3:00 p.m. in the south large conference room.
HD Gas
Jack Rapaport from Ohio University has agreed to purchase HD gas using about $1.5K that he has remaining in his budget. The lower bid was from Cambridge Isotopes ($52/liter). Shipment will be in two bottles to keep the pressure below 1000 psi (where HD starts to decompose). Shelf life is expected to be long. The sample should be over 96% HD. We can make an analysis at the geology department against a known sample.
PST2001 Poster
Andy Bacher and Hermann Nann will work out who will put up the poster at the Polarized Sources and Targets workshop next week in Nashville, IN. Ed Stephenson will prepare the poster.
Target Box
There was a discussion of the construction of the vaccuum shields that are going into the target box. The present material is 50-mil stainless steel. For all of the region where gammas emerge, the gammas must pass through either two or three layers of this material. Numbers obtained by the Russians some time ago indicated that the total attenuation of the gammas would be about 10%. Tom Rinckel proposed a plan to convert critical parts of this baffle to aluminum. That plan was adopted.
Running Schedule
Because of the extension of the tagger run this month, the Michigan group's run had to be postponed. Their next opportunity to run will come the week after Thanksgiving. This means that the Cooler will start with proton beam rather than deuteron. Other requests for proton running will include the p+d -> t+(pi+) experiment for PINTEX and the p+d -> 3He+pi0 test run for CSB. Between the end of the shutdown and the start of running, we will need to spend time using cosmic rays to gain match the Pb-glass detectors. This can proceed during other Cooler running. We should be ready to do our commissioning during December.
In conjunction with this, we need to decide how we will do the calibration of the luminosity detectors. In any case, the HD gas will be used to simultaneously measure d+d (the luminosity process) against d+p elastic scattering. The two options are to use the luminosity detectors in place in the T-region, or to measure the cross section ratio in finer steps using the PINTEX detectors in small angle mode (what they would use for the p+d -> t+(pi+) reaction). In either case, one would have to know the acceptance of the luminosity system well. In order to decide among these possibilities, we need more information. This includes the sensitivity of the luminosity system to angle shifts induced by beam changes and the range of angles most useful in d+d elastic scattering by those theorists looking into the entrance channel wavefunctions for the d+d -> 4He+pi0 calculation.
The tagger experiment is expected to finish Tuesday morning, and work in the Cooler ring will get underway as soon as they have completed taking calibration data with alpha sources and cosmic rays.
Shutdown Tasks
Tom Rinckel presented his plans for work on the Cooler floor. He has asked for one additional person starting this week, with another person the following week. In broad outline, Tom's plans include:
We discussed other projects in an effort to prioritize the list and assign persons who will take first responsibility. These items include initials of those persons.
Next Meeting
Several people will be away next week, so the next meeting will be on October 8.