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

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Presentation transcript:

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

CM23 Harbin January 2009TOF Emittance Measurement2 Saturday 13 th December Shift run # pionsprotonspositrons D2MeV/c various? TOF0MeV/c currentQ various? AQ Q D D Q Q Q Q Q Q

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

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

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

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

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

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

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

CM23 Harbin January 2009TOF Emittance Measurement10 TOF & Momentum

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

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

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