Real Photon Collaboration Engineering Meeting

8/20/02 Minutes

Attendees: 

P Bosted, K Griffioen, M Olson, W Olson, S Rock, J Weisend, C Wilder, D Walz, T Weber, R Arnold, L Keller

Items Discussed: 
1. C Wilder has modeled R Arnold's dump line wire array and ion chambers.  Reggie is using the models to make parts and proof the model.  When satisfied all is well, detail drawings will be made.
2. Per P Bosted's simulations, C37 will need pitch and yaw remote adjustment to achieve an eight-mil (0.2mm) alignment tolerance from front to back of the collimator.
3. T Weber is looking into using piezoelectric actuators to move the target system in "Z" and rotate the target wheel for target selection.
4. T Weber will check on the price of copper and tin.  There was discussion about the possibility of there being copper in house that could be melted down and cast roughly to the size we need.  Tom will also investigate using water tanks versus poly sheets as absorbers in front of the spectrometer front and middle detectors.
5. Shielding in area of LASS --- do we or don't we?  M Olson will look into this question.  MO will check out the 280 shielding blocks on the University campus that are available for use on E160.  MO has put together a scale model of the shielding around the LASS in 104C.
6. L Keller and M Olson will study the LASS/wedge arrangement to see if the wedge position can be moved to where there is zero axial force on it.
7. K Griffioen had copies of the hodoscope cost information for project documentation.
8. Existing Cerenkov vacuum chambers might be useable for the Compton Polarimeter.  P Bosted will investigate it.
9. T Thurston should have the CDR report finished by the end of the week.
10. The Compton collimator is located at pump station 7. (Answer to 7-23-02 new action item 1)
Decisions Reached
1. C37 to have remote pitch and yaw adjustability.
New Action Items
1. P Bosted and M Olson to locate the Compton collimator. (Complete)
2. T Weber to investigate using water tanks versus poly sheets as absorbers in front of the spectrometer front and middle detectors.  This is tied to action item 2 below.
Ongoing Action Items
1. T. Weber will get prices for cast copper and tin.
2. P. Bosted to determine material to be in front of the middle spectrometer detector panel. (In progress)
3. J. Weisend will work with D. Crabb and R. Principe to develop a detailed drawing showing the dilution refrigerator and the proposed superconducting magnet. 
4. P. Bosted will continue the physics simulations of the proposed change to the RPC design. (In progress)
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. (Complete)
6. Shielding and earthquake supports associated with the LASS magnet must be evaluated and designed.  This action item was re-written and M Olson is working on it. (In progress)
7. T. Weber will investigate other E160 target materials to replace the Pb and Au for example Tantalum or Platinum. (In progress)
8. L Keller will identify all forces on the magnet system, and confirm the magnet configuration.  Adding whether re-positioning the wedge can zero the force on the wedge.
W. Olson