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CM23 Harbin January 2009TOF Emittance Measurement1 Beam Characterization with the TOFs Mark Rayner CM23 Harbin.

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Presentation on theme: "CM23 Harbin January 2009TOF Emittance Measurement1 Beam Characterization with the TOFs Mark Rayner CM23 Harbin."— Presentation transcript:

1 CM23 Harbin January 2009TOF Emittance Measurement1 Beam Characterization with the TOFs Mark Rayner CM23 Harbin

2 CM23 Harbin January 2009TOF Emittance Measurement2 Saturday 13 th December Shift run #850 - 854855856 - 858860865 - 871 pionsprotonspositrons D2MeV/c431490130200various? TOF0MeV/c420417100150 currentQ191.8101.225.537.4various? AQ2168185.146.568.2 Q3102.811328.341.6 D1345.6390.489.7130 D2158.5171.143.663.5 Q4283.7299.972.6107.8 Q5380398.496.2143 Q6252.1262.16393.9 Q7263.4038.463.1 Q8398.8057.795.1 Q9340.9048.880.6

3 CM23 Harbin January 2009TOF Emittance Measurement3 Pions from 13 th December

4 CM23 Harbin January 2009TOF Emittance Measurement4 Positrons from 13 th December

5 CM23 Harbin January 2009TOF Emittance Measurement5 Cable Length Calibration (0,1)

6 CM23 Harbin January 2009TOF Emittance Measurement6 Cable Length Calibration (0,0)

7 CM23 Harbin January 2009TOF Emittance Measurement7 Cable Length Calibration (1,0)

8 CM23 Harbin January 2009TOF Emittance Measurement8 Cable Length Calibration (1,1)

9 CM23 Harbin January 2009TOF Emittance Measurement9 TOF0—TOF1 Time of flight (ns) calibration…Mean=8m/30cm ns –  t various p,  >200,  =1  150ps resolution need timewalk correction (and more data!) e+ ‘420MeV/c  +’ Transverse momentum (MeV/c) p=30MeV/c mainly muons amplitude 15.2 sigma 157ps mainly pions amplitude 50.0 sigma 196ps

10 CM23 Harbin January 2009TOF Emittance Measurement10 TOF & Momentum

11 CM23 Harbin January 2009TOF Emittance Measurement11 ++ TOF0 x (mm) TOF1 x (mm)TOF1 y (mm) TOF0 y (mm) TOF0 dx/dz TOF1 dx/dz TOF1 dy/dz TOF0 dy/dz

12 CM23 Harbin January 2009TOF Emittance Measurement12 ++ TOF0 x (mm) TOF1 x (mm)TOF1 y (mm) TOF0 y (mm) TOF0 dx/dz TOF1 dx/dz TOF1 dy/dz TOF0 dy/dz

13 CM23 Harbin January 2009TOF Emittance Measurement13 TOF Beam Char zn Summary ●All the tools required for… ■Space point/time-of-flight/momentum reconstruction at a glance ■Calibrating the TOFs for cable length and testing this calibration ■Measuring emittance ●…are uploaded to G4MICE and easy to use – see software talk ●DAQ and TOF guys are encountering and solving lots of problems ●150 ps time-of-flight resolution due to lack of e+ and time-walk corr. ●Momentum measured, dipole spread >20% confirmed ●Trace space reconstructed. Next: ■Bin carefully, and calculate emittance/optical functions ■Error analysis ■Re-examine MCs ■Take into account emittance growth in Cherenkov

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