Real Photon Collaboration Engineering Meeting

11/20/01

Minutes

Attendees: 

P. Bosted, W. Olson, R. Arnold, M. Palrang, D. Waltz,

Items Discussed: 

1. W. Olson said that the schedule is getting tight for the Toroid and Energy Monitor to be installed by September 30, 2002.  
2. D. Walz said; a) a new collimator is being designed to go in front of the goniometer, b) the e-beam dump was taken apart several months ago and needs work, and c) if the existing toroid and collimator are to be used, they will need to be refurbished.  R. Arnold would like a smaller aperture collimator in front of the wire array than the existing 4" one.
3. R. Arnold reported the energy monitor design is waiting for drawings of the dump magnets and chambers, etc.  It was suggested that the design proceed on the basis of best estimate of what is required, and finalized when more complete information is available. 
4. P. Bosted reported on his studies of the E160 layout. More studies on tradeoffs of materials and designs are required. Collimation will be required between the LASS dipole and the detector. Any target hardware that is permanent in the up-beam side of D3 must be located in the bottom 2" of the chamber.
5. The E159/161 Target system was briefly discussed.  M. Palrang provided layouts of the E159/161 and E160 configurations. The target magnet may be an existing product from Oxford in the $250,000 range.  Delivery would be approximately 1 year, ARO.

New Action Items

1. P. Bosted will calculate the power for a 0.060" thick diamond target.
2. D. Walz will look for a toroid that should be in storage.
3. R. Arnold will define the size of collimation required in front of the wire array.

Ongoing Action Items
.
1. Steve St Lorant will work on the steel for the LASS configuration.
2. J. Weisend will work with D. Crabb and R. Principe to develop a detailed drawing showing the dilution refrigerator and the proposed superconducting magnet 
3. 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.
4. P. Bosted will continue the physics simulations of the proposed change to the RPC design.
5. L. Keller will look at the muon backgrounds in the detector with the new RPC experiment design.
6. 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.
7. Serious engineering of the shielding and earthquake supports associated with the LASS magnet must be started.
8. P. Bosted will consider what the ideal magnet to use in place of 29D36 might look like. Such a magnet might not be too hard to construct.

W. Olson
2