Real Photon Collaboration Engineering Meeting

10/02/01

Minutes


Attendees: 

P. Bosted, T. Weber, M. Palrang, D. Waltz, R. Arnold, S. Kuhn, G. Oxoby, J. Weisend

Items Discussed: 

1. There is a potential change being studied for the configuration of the RPC experiments. In this scenario, the LASS magnet would be installed in E160 at roughly the current position of Q1. The aperture of the LASS magnet would be filled with a large wedge of iron and will run at a lower power of a few 100 kW. D3 will be centered with respect to the beam line and the target without any alumina will be inserted in D3. During E161 and E159, the LASS magnet will stay where it is and the target will be installed in the place of D3. This will increase the cost of E160 but may well reduce the overall costs of the PRC experiments. For example, it may be possible to use the same hodoscopes for all 3 experiments. This scenario is still under study and much work remains to be done. ( See action items below)

2. The LASS magnet test has been completed. No shorts were found and the observed temperatures are reasonable at an operating current of 2700 A. A more detailed analysis of the results is underway.

3. Another issue is the shipping of the hodoscopes to William and Mary University. There is no real urgency for the shipment but K. Baird will try to get a partial shipment out ASAP and will keep in touch to make sure the shipping does not become a bottleneck.

4. Now that the lead has been removed, T. Weber and M. Palrang have made measurements of the front of D3 to allow the designing of the final E160 target/D3 system.

5. T. Weber has heard back from Coors and been told that the error in dimensions that he sees in the alumina blocks currently on hand is indeed typical.

Decisions Reached


New Action Items

1. P. Bosted will continue the physics simulations of the proposed change to the RPC design.
2. L. Keller will look at the muon backgrounds in the detector with the new RPC  experiment design.
3. The interaction of the LASS magnet and all its iron with the E161/ E159 7 T target magnet needs to be carefully modeled using a 3-D field simulation.
4. Serious engineering of the shielding and earthquake supports associated with the LASS magnet must be started.
5. G. Oxoby and R. Arnold will examine possible cable runs during the ROD scheduled for October 10th.

Ongoing Action Items
.
1. Number of cables required from the counting house to ESA. G. Oxoby will start tabulating these numbers based on the data acquisition memo and additional information from the collaboration.

J. G. Weisend II


2