September 9, 2011

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summary what was done

Run # Beam Dump magnet Collimator Radiator Target Comments
2339 Up 2 mm In Open Up 2 mm No PS Rate is: R(upstream) = 2648/35092 = 0.075 e+/pulse, R(downstream) = 3191/35092 = 0.091 e+/pulse
2341 Up 2 mm In Open Out No PS Rate is: R(upstream) = 1088/35494 = 0.031 e+/pulse, R(downstream) = 1328/35494 = 0.037 e+/pulse. About 59% of photons are coming from the radiator. Bad
2342 Down 2 mm In Open Out No PS Rate is: R(upstream) = 1586/36678 = 0.043 e+/pulse, R(downstream) = 1888/36678 = 0.051 e+/pulse
2343 Down 2 mm In Open Down 2 mm No PS Rate is: R(upstream) = 2232/35488 = 0.063 e+/pulse. About 32% of photons are coming from the radiator. Bad
2344 Centered In Open Centered No PS Rate is: R(upstream) = 2683/35095 = 0.076 e+/pulse
2345 Centered In Open Out No PS Rate is: R(upstream) = 1039/35094 = 0.029 e+/pulse. About 62% of photons are coming from the radiator. Bad
2346 Centered In Open Out No PS Rate is: R(upstream) = 1286/35885 = 0.036 e+/pulse. Improved shielding around dump.
Based on the previous results the beam is total crap, so beam turn up.
2349 Centered In Open Out No PS Rate is: R(upstream) = 404/35489 = 0.011 e+/pulse.
2350 Centered In Open Out No PS Rate is: R(upstream) = 428/35093 = 0.012 e+/pulse. Additional shielding around the vacuum window of the beam pipe.
2351 Centered In Open Centered No PS Rate is: R(upstream) = 1314/35094 = 0.037 e+/pulse. Additional shielding around the vacuum window of the beam pipe is removed. About 68% of photons are coming from the radiator. Still bad
2352 Up 2 mm In Open Up 2 mm D2O buttle Assymetry rate measurements

Beam Realignment

Screen shot using Phosphorous screen

9 9 11 10am.jpg

Electron beam on glass

E-glass.jpg

12pm upstream view screen

12pm upstream.jpg

12pm downstream view screen

12pm downstream.jpg