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Minuit Alignment Update

Minuit Alignment Update. Jianchun Wang 04/10/00. Outline Monte Carlo generator MC alignment Alignment of FPIX0 pstop at 15º Plan. Monte Carlo Generator. Rob’s simulation code (template for user): simulate a track using beam condition compute intersection at each plane

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Minuit Alignment Update

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  1. Minuit Alignment Update Jianchun Wang 04/10/00 Outline Monte Carlo generator MC alignment Alignment of FPIX0 pstop at 15º Plan

  2. Monte Carlo Generator Rob’s simulation code (template for user): • simulate a track using beam condition • compute intersection at each plane • smear the position with a fixed resolution Reconstruction: • SSD simulation shown • SPD has error Jianchun (JC) Wang

  3. Monte Carlo Generator What I did (use Rob’s template): • Add Npix-dependent resolution & percentage • Add inefficiency of the detector • Output in proper format (skip Rob’s reconstruction) Useful files for people who want to try: mc_main.F, mc_get_sigma.F, mc_sigma.txt in directory: ~wangjc/testbeam/minuit_fit/mc_gen/ Jianchun (JC) Wang

  4. Monte Carlo Generator Comparison to run 6653 (FPIX0-pstop at 15º) after inefficiency and resolution simulation Jianchun (JC) Wang

  5. Minuit Fitting • Add control in tb_monitor.nml: • trk_control = ‘input’, ‘output’, ‘none’ • trk_file = ‘track.dat’ • Track selection criteria before minuit fit: • Only 1 track in the event • At least 4 planes have hits • At least 2 good y hits • Kalman filter OK • 2 / ndof < 4 (?) • FPIX0 row 15-50, FPIX1 row 1-85 • Code send to CVS Jianchun (JC) Wang

  6. MC alignment • The 2 of Kalman filter normalized to ndof shown • The first one uses generator geometry for reconstruction • The parametersare randomly changed as bad geometry (7 : 0.278  0.200 rad) • The alignment takes 4-5 CPU hours (10K event) • Several different geometry configurations tested Jianchun (JC) Wang

  7. MC alignment • Residual of FPIX0-pstop at 15º shown • The resolutions with generator geometry and aligned one are both 5.81 m • The resolution with “bad” geometry is 10.8 m, and the center is shifted Jianchun (JC) Wang

  8. 2 5 8 7 3 6 1 beam x y x x x y x MC alignment Resolution for different detector Jianchun (JC) Wang

  9. Data Alignment • FPIX0 pstop at 15o (run 6653), 10K tracks selected • 2 of Kalman filter before and after alignment shown • The mean value is slightly improved from 1.10 to 1.08 Jianchun (JC) Wang

  10. Residual of FPIX0 • The sigma of plane 7 residual changed slightly from 6.54 to 6.50m • It is quite possible that Charles’ alignment is good enough in this case Jianchun (JC) Wang

  11. To be done • get_sigma.F need to be updated • Resolution simulation for NPIX=1 • ???? Jianchun (JC) Wang

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