Real Photon Collaboration Engineering Meeting

3/5/02 Minutes

Attendees: 

W. Olson, M. Palrang, S. St Lorant, K. Baird, M. Racine

Items Discussed: 

1. S. St Lorant, L. Keller and W. Olson delivered a draft Statement of Work for the LBNL Magnetic field analysis for E160 to LBNL on February 20th.  Since then, the original 3-D magnet model, and a revised model with a segmented wedge, have been given to LBL by M. Palrang.  The final SOW is almost ready.
2. Alignment of the LASS magnet was discussed.  Tolerances for the positions of the magnet, the wedge, and beam-pipe, relative to the beamline, need to be determined before an alignment concept can be specified.
3. The E158 layout drawing lacks a few support structures of being complete.  K. Baird will get with C. Wilder to help him gather support structure information.  Once completed and checked, this will be the template for the E160 layout drawing.
4. The GLAST run schedule was corrected to February and March 2004.  This means that the photon beam line must be installed and commissioned by the end of January 2004, and all installation work, both in the switchyard and ESA must be completed by the end of November 2003.  Scheduling switchyard installation time is still up in the air, but being worked on.
5. Discussion about DC3 being hot and whether it should be removed, as the pincushion is to be installed in front of it.  AI

Decisions Reached

1.  The LASS copper between the wedges should be 25.4 mm thick

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. G. Oxoby 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.
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.
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