Present: Chris Allgower, Andy Bacher, Hermann Nann, Tom Rinckel, Paul Pancella, Ed Stephenson
Meeting came to order at 3:08 pm.
STATUS REPORTS
Magnet coil wrapper returns to the lab tomorrow, so we can probably start winding a new upper coil for the septum on Monday.
There is progress on the request to borrow FERA from Fermilab. Unfortunately, the paperwork will not be done in time for Hal Spinka to bring it on his trip to IUCF next week.
The wire chamber we plan to use as WC3 has actually been moved to Doug Bilodeau's lab. Due to the wire spacing and PCOS configura- tion, its sensitive size can be varied in units of about 5". We envisioned 10" vertical by 15" horizontal, but we have enough electronics to also use 15" vertical, if necessary. High voltage testing can be done in Doug's lab, but probably not immediately.
MAGNETIC CHANNEL
PVP showed the effect on the alpha envelope of varying the magnetic fields in the channel, as predicted by Transport. Varying any of the fields by +/- 2% has no drastic effect on the size of the envelope at channel end, and this includes varying the septum field. Interestingly, varying the septum by 2% has almost no effect on the size of the ellipse at channel end, but mainly affects the size in Q2 and Q3. The effect of varying the quads at this level is predicted to be only about a centimeter in the full width or height at channel end.
Stephenson presented another way of looking at multiple scattering effects that combines information from the latest Transport model with work done earlier by Pickar in GEANT. The conclusion seems to be that a 12-inch diameter pipe will be sufficient for the vacuum chamber between Q3 and the channel end detectors.
POLARIMETRY RUN
Next was a discussion of the upcoming run to commission Pintex as a Cooler beam polarimeter for deuterons at the nominal CE78 energy. The published schedule has the Cooler closing on Monday, 2/12 to start trying to get polarized deuterons out of CIS at 100 MeV, stored in the Cooler and ramped to 231.4 MeV. It is likely that suitable stored beam in the Cooler will not be available before very late Wednesday night (2/14) or early Thursday. There is also a good possibility of a delay due to vacuum. Some essential cryo pumps are presently out of commission, and needed replacement parts may not be in house until Friday 2/9 or later. We'll have to wait and see.
Chris, Paul, and Ed got together last Monday and parcelled out the necessary tasks, and preparations are proceeding on schedule from our side. Ed has started a binder for documentation and reference material, and hopes to have Riken polarization data bracketing our energy in time to use for analyzing power calibration. Paul and Ed will also draft a personnel shift schedule and begin working on a run plan.
TARGET BOX
Pancella gave a brief report on the status of the target box design, being done mostly by Jack Doskow. The design is approaching the point where a bid package can be prepared for the main welded assembly. Several issues were discussed, but none of them should prevent Jack from beginning to prepare the parts drawings for this assembly very soon. After further scrutiny by Rinckel and Pancella, it will then be turned over to Walt Fox to assemble the complete specifications.
ELECTRONICS SETUP
Still no power to the racks, but Allgower continues to make progress with cables and modules. He has determined that the timing should be okay with the lemo cable he mostly has in hand.
The meeting adjourned at about 4:50 pm.