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. 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	Detector set-up
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) = n/pulse R(beam 45 right) = n/pulse R(beam down) = n/pulse R(upstream) = e+/pulse