Real Photon Collaboration Engineering Meeting

5/14/02 Minutes

Attendees: 

R. Arnold, P. Bosted, W. Olson, S. St. Lorant, D. Walz, T. Weber. J. Weisend, C. Wilder, 

Items Discussed: 
1. The spectrometer is getting close to concept final definition.  Final materials and iron wedge size evaluations are being made.  C. Wilder will estimate material volumes and T. Weber will get prices for copper and graphite.  P. Bosted will look at water or aluminum in front of the middle detector panel.
2. W. Olson will put together a strawman agenda for the conceptual design review to be held around June 20, 2002.
3. The Compton Polarimeter was discussed briefly.  It will consist of 100 lead glass blocks.  The design is still in the conceptual stage.  Schedule and accounting wise, it has been moved from E-159 to E-160.
4. The existing 3DC2 collimator will be replace it with a simpler design. It will have a fixed bore with the collimator itself being the vacuum chamber.  D. Walz will coordinate the design.
5. Moving the SEQ, ION chamber, and Cerenkov from the BDE area to the E-158 detector cart, which puts them in the ESA and provides much easier installation and access, was adopted pending adequate shielding could be provided.  W. Olson will contact Alyssa Prinz for a shielding evaluation and requirements.
Decisions Reached
1.  Move the SEQ, Cerenkov, and ION from the BDE to the E-158 detector cart.
New Action Items
1. C. Wilder will estimate material volumes and T. Weber will get prices for copper and graphite.
2. W. Olson will contact Alyssa Prinz for a shielding evaluation and requirements.
Ongoing Action Items
1. J. Weisend will work with D. Crabb and R. Principe to develop a detailed drawing showing the dilution refrigerator and the proposed superconducting magnet. 
2. Number of cables required from the counting house to ESA. P. Stiles and A. Angelov will start tabulating these numbers based on the data acquisition memo and additional information from the collaboration.
3. P. Bosted will continue the physics simulations of the proposed change to the RPC design. (In progress)
4. 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. (In progress)
5. Serious engineering of the shielding and earthquake supports associated with the LASS magnet must be started. 
6. T. Weber will investigate other E160 target materials to replace the Pb and Au for example Tantalum or Platinum.
W. Olson