1. 5 May 2009MICE Analysis - MR1 The December Shifts: Beam Characterization by the Time of Flight System Mark Rayner

2. 5 May 2009MICE Analysis - MR2 ALL: calibrate SURVIVORS: characterize the beam

3. 5 May 2009MICE Analysis - MR3 Characterization of the December beam trace space momentum spectrum of the beam emittance alpha beta gamma fit quantities interesting to beam line people time of flight transverse position at TOF0 and TOF1 TOFs measure momentum track calibrated Problem: Small number of particles means only the central pixels have been calibrated well, but the position measurement is essential to the emittance measurement  We must attempt to calibrate all pixels of TOF0 and TOF1  Basic method from Harbin CM (no time-walk, ignores trigger intricacies): today’s data  Time-walk + simplified cable length correction: in development, problems remain PID

4. 5 May 2009MICE Analysis - MR4 TDC cabling of TOF0 and TOF1 Except TOF0 outer slabs (0 and 9 in both planes)  TDC board 3 2 0 1 NS 021 B T Beam PMT number 0  TDC board 0 PMT number 1  TDC board 1 Plane 0Plane 1 Can compare S and B and N and T without worrying about the trigger

5. 5 May 2009MICE Analysis - MR5 Simplified Cable Length Calibration sums over: (TDC S slab i) – (TDC B slab j) – linear correction n S0 n S6 0 0 n B0 n B6 0 0 n ij n ij T vector of cable length corrections = Depends only on number of hits per pixel Depends only on number of hits per PMT Write down everything we know per TDC board Form a matrix equation Minimize chi-square  One number per PMT  A best-guess calibration for every PMT with a hit Problem Too many zero entries Determinant = 0  Refining method

6. 5 May 2009MICE Analysis - MR6 Trace Space Reconstruction Focusing transfer matrixDefocusing transfer matrix Effective length l [m] Central quadrupole gradient [T/m] 300 150 MeV/c Defocusing Focusing Effective phase advance  [radians] Central quadrupole gradient [T/m] 150 200 250 300 MeV/c Effective focusing strength k [m -2 ] Central quadrupole gradient [T/m] 150 200 250 300 MeV/c

7. 5 May 2009MICE Analysis - MR7

8. 5 May 2009MICE Analysis - MR8 Emittance measurement ??? Horiz TOF0 Vert TOF0 Horiz TOF1 Vert TOF1