Real Photon Collaboration Engineering Meeting

6/26/01

Minutes


Attendees: 

T. Weber, R. Rogers, G. Oxoby, M. Racine, A. Candia, S. Mao, W. Olsen, 
P. Bosted, K. Baird, R. Arnold, T.Fieguth, D. Waltz, J. Weisend

Items Discussed:

1. Additional shielding may be required in the beam dump east area. 
This might be achieved with additional sandbags but we have previously 
agreed with B. Youngman that those sandbags would come down at the end 
of E158.

2. It may be preferable to move the SEQ inside the end station and place 
shielding as required between it and the E160 detectors.

3. The basic design of the E160 spectrometer is complete. However, 
significant fine-tuning is required.

4. The ion chamber and the Cerenkov counter are projects that are
 appropriately sized for university work. The rough cost estimate 
for each of these items is no more than 10 K$.

5. The design of the lead aluminum collimator for use in D3 was discussed.

Decisions Reached:

1. There should not be any reason to remove the E158 shielding walls 
for E160, though parts of the roof will have to be moved to remove and 
insert beam line components. Parts of the shielding walls will have to 
be removed to provide room for the LASS magnet in the E161 experiment.

2. S. Mao will calculate the shielding requirements for E160 assuming 
an average beam power of 300 W and a run time of 2 months a year.

3. For the upcoming design review, the current basic design of the 
spectrometer will be used to estimate cost and schedule.

4. The SEQ requires a separate vacuum of 10-7 torr. This was previously 
done with a diffusion pump. It most likely will be accomplished this time 
with a Turbo pump cart system. The vacuum space of the SEQ can be baked out.

5. The default design of the wire array is to use the existing E158 wire 
array with the addition of a removable tungsten target. For E160 the wire 
array must work with both electron and photon beams. Further calculations 
are needed to see if this design will work.

6. It is clear a new vacuum bellows will be required at the upstream end 
of the D3 vacuum chamber.

Action Items:

1. K. Baird will discuss with B. Youngman the possibility of leaving the 
shielding sandbags in place after E158 for use in E160.

2. S. Mao will calculate the neutron background caused by moving the SEQ 
inside the end station.

3. T. Tuck will work on refurbishing and testing the LASS magnet this summer.

4. P. Bosted will review the physics implications of centering D3 onto the 
beam line.

5. R. Arnold will perform calculations to check if the existing wire array 
may be used in E160 with the addition of a tungsten target.