September 16, 2011

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summary what was been done

Run #	Beam	Dump magnet	Collimator	Hardener	Radiator 10 um Al	Target	Comments
2459	Up 90A	In	Open	Yes	Out	DU cylinder	Beam check-in run. R(beam down) = 1/160279 = 0.0000062 n/pulse R(upstream) = 124/160279 = 0.00077 = e+/pulse
2460	Down 86A	In	Open	Yes	Out	DU cylinder	Beam check-in run. R(beam down) = 0/160873 = 0 n/pulse R(upstream) = 142/160873 = 0.00088 = e+/pulse
2461	Down 86A	In	Open	Yes	Down	DU cylinder	Beam check-in run. R(beam down) = 33/160084 = 0.0002061 n/pulse -> ×180×60 = 2.2 n/min R(upstream) = 990/160084 = 0.00618 e+/pulse About 86% of photons are coming from the radiator according to PS. Good
2462	Up 90A	In	Open	Yes	Up	DU cylinder	Beam check-in run. R(beam down) = 0.000362 n/pulse -> ×180×60 = 3.9 n/min R(upstream) = 1064/165434 = 0.00643 e+/pulse About 88% of photons are coming from the radiator according to PS. Good
2463	Up 90A	In	Open	Yes	Up	Out	Beam check-in run. R(beam down) = 0 n/pulse R(upstream) = 0.0062 e+/pulse
2464	Down 86A	In	Open	Yes	Down	Out	Beam check-in run. Short beam off R(beam down) = 0.000029 n/pulse R(upstream) = 0.0055 e+/pulse
2465	Down 86A	In	Open	Yes	Down	Out	Beam check-in run. Redoing 2464 R(beam down) = 3/160876 = 0.000019 n/pulse R(upstream) = 1053/160876 = 0.0065 e+/pulse
2466	Down 86A	In	Open	Yes	Down	DU cylinder	Long production run R(beam down) = 243/972019 = 0.00025 n/pulse -> ×180×60 = 2.7 n/min R(upstream) = 0.0064 e+/pulse
2467	Up 90A	In	Open	Yes	Up	DU cylinder	Long production run R(beam down) = 292/972017 = 0.00030 n/pulse -> ×180×60 = 3.2 n/min R(upstream) = 0.00656 e+/pulse
2468	Up 90A	In	Open	Yes	Out	DU cylinder	Long production run R(beam down) = 0/162265 = 0 n/pulse R(upstream) = a/162265 = 0.00170 e+/pulse About 74% of photons are coming from the radiator according to PS. Bad
2469	Up 90A	In	Open	Yes	Out	DU cylinder	Long production run. Bean was turned up a little by operator's view screen. R(beam down) = n/pulse R(upstream) = = 0.00 e+/pulse Still bad
Removed dump magnet and recalibrated beam

Run #	Beam	Dump magnet	Collimator	Hardener	Radiator 25 um Al	Target	Comments
2474	Up 90A	In	Open	Yes	Up	DU cylinder	Short production run ~10 min. R(beam down) = 76/108383 = 0.000701 n/pulse -> ×180×60 = 7.6 n/min R(upstream) = 1223/108383 = 0.01128 e+/pulse
2475	Down 86A	In	Open	Yes	Down	DU cylinder	Short production run ~10 min. R(beam down) = 49/108579 = 0.000451 n/pulse -> ×180×60 = 4.9 n/min R(upstream) = 743/108579 = 0.00685 e+/pulse
2476	Down 86A	In	Open	Yes	Out	DU cylinder	Short production run ~10 min. Sweep and pair-spectrometer magnets were not in position as before, so it could affect the cnt rate of PS detectors for the last 3 runs. R(beam down) = 1/108382 = 0.0000092 n/pulse R(upstream) = 161/108382 = 0.00148 e+/pulse About 78% of photons are coming from the radiator according to PS. So-so

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