September 13, 2011

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summary what was been done

Run #	Beam	Dump magnet	Collimator	Radiator 10 um Al	Target	Comments
2385	Up 2 mm	In	Open	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	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	Up 2 mm	DU plate	Lost beam
2388	Up 2 mm	In	Open	Up 2 mm	DU plate	Beam check-in run. 1" Al Hardener in as before. 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	Up 2 mm	DU plate	Detectors set-up. Two of them are non-working.
2396	Up 2 mm	In	Open	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	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	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	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	Out	No
2401	Up 2 mm	In	Open	Out	DU plate
2402	Up 2 mm	In	Open	Out	DU plate
2402	Up 2 mm	In	Open	Up 2 mm	DU plate	Oleksiy moved radiator in
2403	Up 2 mm	In	Open	Up 2 mm	DU plate	Jason moved radiator in. Same results.
2404	Center	In	Open	In	DU plate
2405	Center	In	Open	In	DU plate	DU plate was repositioned. Now beam should hit small part of the target corner.
2406	Center	In	Open	In	DU plate	Same as 2405
2407	Up 2 mm	In	Open	Out	DU plate	Additional shielding added around the core part of the beam pipe (downstream the radiator)
2408	Up 2 mm	In	Open	Out	DU plate	Same as 2407 but additional shielding removed to improve background countime rate
2409	Up 2 mm	In	Open	2 mm up	DU plate
2410	Up 2 mm	In	Open	2 mm up	DU plate	Beam tuned up a bit, new camera was installed
2411	Up 2 mm	In	Open	Out	DU plate
2412	Up 2 mm	In	Open	Out	DU plate	Put additional shielding around conical part of the beam pipe.
2413	Up 2 mm	In	Open	Out	DU plate	same as 2412. slits @ 300
2414	Up 2 mm	In	Open	Out	DU plate	same as 2412. slits @ 200
2415	Up 2 mm	In	Open	Out	DU plate	same as 2412. slits @ 100
2416	Up 2 mm	In	Open	Out	DU plate	same as 2412. slits @ 60
2417	Up 2 mm	In	Open	Out	DU plate	same as 2412. slits @ 60. Anode voltage is lowered from 3.9 to 3.0 arb. units