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Advanced Simulation Results Tracking and Vertex Search Analysis

This report analyzes simulation results on tracking and vertex search methods, highlighting performance variations and dependencies on parameters like step size and energy conditions. Comparison of different methods and conditions reveals insights for improving accuracy.

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Advanced Simulation Results Tracking and Vertex Search Analysis

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  1. NKS2 Meeting2008/10/16 K. Futatsukawa

  2. NKS2

  3. Simulation Result Tracking and Vertex Search Diff: vx (tracking &vertex search) - dx Vertex Search (first point from simulation) Diff: vx (vertex search) - dx vx : vertex point x dir. from analyzer dx : decay point x dir. from simulation x [cm] Tracking is cause, but program resolution of vertex search is not so good

  4. Step Size of Runge-Kutta Vertex Search (first point from simulation) Strongly dependence on step size of Runge-Kutta Not Only RMS but also Mean, Tail

  5. Simulation Condition Tracking and Vertex Search Diff: vx (tracking &vertex search) - dx Vertex Search (first point from simulation) Diff: vx (vertex search) - dx Simulation Condition : 0.8 < PK0 < 1.1 [GeV/c] 0.5 < cosqK0 < 1.0 Not So Good x [cm]

  6. Simulation Condition Tracking and Vertex Search Diff: vx (tracking &vertex search) - dx Vertex Search (first point from simulation) Diff: vx (vertex search) - dx Simulation Condition : 0.8 < Eg < 1.1 [GeV] Isotropic in CM frame Vacuum of all materials x [cm] Runge-Kutta Step Size 1.0 Two peak is distinguished

  7. Step Size of Runge-Kutta Vertex Search (first point from simulation) Step Size 1.0 Simulation Condition : 0.8 < Eg < 1.1 [GeV] Isotropic in CM frame Vacuum of all materials Step Size 0.5 Strongly dependence on step size of Runge-Kutta Step Size 0.25 I think Runge-Kutta : not so bad Interpolate : bad Step Size 0.1

  8. New Vertex Method p+ Vertex Search : Runge-Kutta Method Pre-Pre Points Pre-Points p- Nearest Points 1st Runge-Kutta(ss1.0) : Search the nearest points 2nd Runge-Kutta : one more time from pre-pre points using smaller ss

  9. New Vertex Method Vertex Search (first point from simulation) Simulation Condition : 0.8 < Eg < 1.1 [GeV] Isotropic in CM frame Vacuum of all materials Enough Performance 1st Runge-Kutta(ss1.0) : Search the nearest points 2nd Runge-Kutta : one more time from pre-pre points using smaller ss pre ss0.05

  10. NKS2-2 = NKS3

  11. CAMAC Scaler Left > Right Why ??? From Upstream, Beam line 1 m Wanted : No Target, No Radiator Data #run 2063

  12. Width : VC Width of Discriminated Signals abs |falling – rising| Expected Shape signals noises Not like this !!! We can’t separate signals from noises Or Noises level was too less [ch]

  13. Width%TDC : VC X axis : TDC [ch] Y axis : Width [ch] ? …?? …….??? No Comment !!! Projection to X dir. in Next Page

  14. ProjectionX : VC W:20~40 W:40~60 W:60~80 W:0~20 X axis : TDC [ch] W:100~120 W:120~140 W:140~160 W:80~100 ? …?? …….??? In small width region, noise level is larger. A little …my feeling !!! W:180~200 W:200~220 W:220~240 W:160~180 W:260~280 W:280~300 W:240~260 Whether we have widths or not, We can’t separate signals from noises. (in this level)

  15. Width%TDC Vol.2 : VC Same graphs From Scatter To Contour No signals in this region far from s-wires Hypothesis : In the region far from s-wires, the effect of diffusion is large. Large pulses -> Small pulses Small pulses -> Too small pluses, under the Vth

  16. Rising ?, Falling ?, Leading ?, Trailing ? Rising : fr = 1 Really ??? One manual : fr=1 : leading edge fr=0 : trailing edge Other manual : fr=1 : falling edge fr=0 : rising edge TDC distribution and old data talk : fr=1 : falling edge fr=0 : rising edge Falling Falling : fr = 0 Rising I am sorry for having mistake of name in UserDCMonitor.cpp Bad Boys are this manual and Tsukada-san

  17. HV dependence : TDC HV : 2100 V, Vth : - 3 V HV : 2000 V, Vth : - 2.5 V HV : 1900 V, Vth : - 3 V rising rising rising #run 2043 #run 2044 #run 2063 falling falling falling Not So Bad Not enough HV ??? More Need ???

  18. Width%TDC Vol.3 : VC HV : 2100 V, Vth : - 3 V Red Region : HV ~2000V, Vth -2.5 V NOT Modify @HV～2000V, Vth -2.5V

  19. Width%TDC Vol.3 : VC HV : 2100 V, Vth : - 3 V … Attention Please !?

  20. Cross-Talk The channels of no connect to VC don’t have signals The cross-talk is too less @ASD & AMT-TDC

  21. Channels Correlation ch43%ch41 ch42%ch41 AMT20 ch 43 [ch] AMT20 ch 42 [ch] AMT20 ch 41 [ch] AMT20 ch 41 [ch] Next Channel Next Next Channel What is this correlation ???

  22. Channels Correlation ch42%ch41 ch42%ch41 Next Channel AMT20 ch 42 [ch] AMT20 ch 42 [ch] AMT20 ch 41 [ch] AMT20 ch 41 [ch] Width Cut : Width < 50 ch Selected Region

  23. Number of Hits B : rising #hits R : #hits @ width < 50 ch …………NoComment!!!

  24. Number of Hits @TDC<750 B : rising #hits R : #hits @ width < 50 ch DifferentShapes!!!

  25. Number of Hits Rising R : #hits @ 1100 < tdc < 800 B : #hits @ 300 < tdc < 600 We can’t get the information form #hits

  26. Event Display Just a Moment, Please !!!

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