September 14, 2011

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summary what was been done

Run # Beam Dump magnet Collimator Hardener Radiator 10 um Al Target Comments
2385 Up 2 mm In Open No Out DU plate Beam check-in run. Beam hardener off. DU plate 45/45 degree orientation and gammas hit the bottom right corner of plate from upstream view.

R(beam 45 left) = 6/173553 = 0.0000346 n/pulse
R(beam 45 right) = 0/583758 = 0.0 n/pulse
R(beam down) = 15/173553 = 0.0000864 n/pulse
R(upstream) = 1374/173553 = 0.00792 e+/pulse
Lost beam

2386 Up 2 mm In Open 1" Al Up 2 mm DU plate Beam check-in run. 1" of Al hardener in front of upstream radiator.

R(beam 45 left) = n/pulse
R(beam 45 right) = n/pulse
R(beam down) = 90/79367 = 0.0011340 n/pulse
R(upstream) = 1058/57841 = 0.01829 e+/pulse
About 57% of photons are coming from the radiator according to PS. Bad
About 92% of neutrons are coming from the radiator according to n detector down. Good

2387 Up 2 mm In Open 1" Al Up 2 mm DU plate Lost beam
2388 Up 2 mm In Open 1" Al Up 2 mm DU plate Beam check-in run. Target realignment, now the gammas hit the center of DU plate, which is as before 45/45 degree orientation

R(beam 45 left) = n/pulse
R(beam 45 right) = n/pulse
R(beam down) = n/pulse
R(upstream) = e+/pulse
About % of photons are coming from the radiator according to PS. Bad

2389-2395 Up 2 mm In Open 1" Al Up 2 mm DU plate Detectors set-up. Two of them are non-working.
2396 Up 2 mm In Open 1" Al Up 2 mm DU plate HV on A22 and A24 are -1700V. Detector check run. All setup as before. Radiator in/out test

R(beam 45 left) = 104/216929 = 0.000479 n/pulse
R(beam 45 right) = 62/216929 = 0.000286 n/pulse
R(beam down) = 300/216929 = 0.001383 n/pulse
R(upstream) = 4787/216929 = 0.02207 e+/pulse

2397 Up 2 mm In Open 1" Al Out DU plate Radiator in/out test

R(beam 45 left) = 9/200289 = 0.0000449 n/pulse
R(beam 45 right) = 8/200289 = 0.0000399 n/pulse
R(beam down) = 19/200289 = 0.0000949 n/pulse
R(upstream) = 1113/200289 = 0.00556 e+/pulse
About 75% of photons are coming from the radiator according to PS

2398 Down 2 mm In Open 1" Al Down 2 mm DU plate Radiator in/out test

R(beam 45 left) = n/pulse
R(beam 45 right) = n/pulse
R(beam down) = n/pulse
R(upstream) = e+/pulse

2399 Down 2 mm In Open 1" Al Out DU plate Radiator in/out test

R(beam 45 left) = n/pulse
R(beam 45 right) = n/pulse
R(beam down) = n/pulse
R(upstream) = e+/pulse
About % of photons are coming from the radiator according to PS.

2400 Up 2 mm In Open 1" Al Out No
2401 Up 2 mm In Open 1" Al Out DU plate
2402 Up 2 mm In Open 1" Al Up 2 mm DU plate Oleksiy moved radiator in
2403 Up 2 mm In Open 1" Al Up 2 mm DU plate Jason moved radiator in. Same results.
2404 Center In Open 1" Al In DU plate
2405 Center In Open 1" Al In DU plate DU plate was repositioned. Now beam should hit small part of the target corner.
2406 Center In Open 1" Al In DU plate Same as 2405
2407 Up 2 mm In Open 1" Al Out DU plate Additional shielding added around the core part of the beam pipe (downstream the radiator)
2408 Up 2 mm In Open 1" Al Out DU plate Same as 2407 but additional shielding removed to improve background countime rate
2409 Up 2 mm In Open 1" Al Up 2 mm DU plate
2410 Up 2 mm In Open 1" Al Up 2 mm DU plate Beam tuned up a bit, new camera was installed
2411 Up 2 mm In Open 1" Al Out DU plate
2412 Up 2 mm In Open 1" Al Out DU plate Put additional shielding around conical part of the beam pipe.
2413 Up 2 mm In Open 1" Al Out DU plate same as 2412. slits @ 300
2414 Up 2 mm In Open 1" Al Out DU plate same as 2412. slits @ 200
2415 Up 2 mm In Open 1" Al Out DU plate same as 2412. slits @ 100
2416 Up 2 mm In Open 1" Al Out DU plate same as 2412. slits @ 60
2417 Up 2 mm In Open 1" Al Out DU plate same as 2412. slits @ 60. Anode voltage is lowered from 3.9 to 3.0 arb. units

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