Real Photon Collaboration Engineering Meeting 10/30/01 Minutes Attendees: P. Bosted, W. Olson, R. Arnold, J. Weisend, M. Racine, F. O'Neill, M. Palrang Items Discussed: 1. R. Arnold is almost done with the design for the dump line wire array. It was agreed that we should have some formal drawings made up of this device for proper documentation. This work may be assigned to G. Kraft after he finishes the update of the E158 beam line components drawing. The E158 beam line drawing will then be used as a starting point for a similar E160 drawing. 2. It is desirable that the polarization in the new photon beam be measured as soon as feasible with the Compton polarimeter. Could such a test be interleaved between the next two E158 runs? There is still uncertainty about the start and length of next year's down time as well as the schedule for completion of the photon beam line. It is difficult to plan for a polarimetry test until these schedules are firmed up. 3. P. Bosted and others are beginning to think about how to best use the existing iron plates with the LASS magnet. Decisions Reached 1. P. Bosted has determined that it would be best to have 2 or possibly 3 different target positions between the front and middle of D3 in E160. This is best accomplished by having a movable target system inside the D3 chamber. P. Bosted will start carrying out detailed simulations of this scenario. 2. Due to uncertainty in the design of experimental components, it was felt best to delay any preliminary safety committee reviews until January of 2002. New Action Items 1. M. Palrang will start to lay out the LASS (with iron wedge) and D3 to see how close they can be placed in the E160 experiment. 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. L. Keller will look at the muon backgrounds in the detector with the new RPC experiment design. 5. 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. 6. Serious engineering of the shielding and earthquake supports associated with the LASS magnet must be started. J. G. Weisend II 2