Real Photon Collaboration Engineering Meeting

9/18/01

Minutes


Attendees: 

P. Bosted, T. Weber, M. Palrang, K. Baird, M. Racine, S. Kuhn, Z. Vassilian, B. Brugnoletti, G. Oxoby, J. Weisend

Items Discussed: 

1. The LASS magnet test. The plan is to test the magnet at up to 1 MW in power. This power level should allow the use of the existing 1-inch hose and will thus solve the problem of providing cooling water for the magnet. The current in the coils will be brought up slowly and the coil temperature will be monitored via an optical pyrometer. Measurements of B vs. I will be made during the test at various parts of the magnet. It is desirable that the magnet iron reach its steady state temperature, which may take a day or so. T. Tuck believes he can replace all of the magnet Klixons though this is not strictly needed for the test. T. Tuck is also working on the power supply interlock boxes. It was noted that there were two different types iron of differing qualities in the LASS magnet. Z. Vassilian  also mentioned that in the original tests of the magnet in the 70's, one of the coils was shorted but that the short went  away over time. 
2. M. Palrang and T. Weber presented the most recent designs of the E160 target and D3 collimator. The effort is slightly hampered by not being able to measure the actual front of the D3 magnet. However, it is expected that the lead walls at the front of D3 will be removed before the end of this year permitting the measurements to be made. However, even at this stage it appears that the target system will fit where desired. The downstream beam pipe will be made from aluminum roughly 0.75 " ID with a 35 mill wall. It is expected that aluminum cradles will be placed below and above this beam pipe to provide the transition from the circular geometry of the pipe to a rectangular geometry suitable for stacking the alumina bricks. In the area where the beam pipe passes through tungsten, either air gaps will be allowed between the pipe and the tungsten pieces or the tungsten will be machined to match up with the pipe.

3. D. Waltz and T. Fieguth have started to think about needed changes for the goniometer  chamber. B. Brugnoletti will start making measurements on the existing chamber so that he may start on the detailed design changes.



Decisions Reached

1. It is desirable that the LASS magnet test be conducted before Oct.6.
2. It is now expected that the target and D3 system will be assembled by sliding the system in from one end of the magnet. However, the magnet will still have to be removed from the beam line for this purpose.


New Action Items

1. Concerning the LASS magnet test, P. Bosted will talk to P. Anthony regarding safety issues and to R. Erickson regarding scheduling.
2. K. Baird and R. Boyce will investigate the suitability of using the existing 1-inch hose to cool the LASS magnet during the upcoming test.
3. Once the lead is removed from the front of D3 T. Weber and M. Palrang will make measurements to allow the designing of the final E160 target/D3 system.
Ongoing Action Items

1. P. Bosted will create a test plan for the LASS magnet checkout 
2. This summer's LASS magnet tests.
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.

J. G. Weisend II


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