NKS 2 Meeting 20081016 K Futatsukawa NKS 2

NKS 2 Meeting 2008/10/16 K. Futatsukawa

NKS 2

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 x [cm] dx : decay point x dir. from simulation Tracking is cause, but program resolution of vertex search is not so good

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

Simulation Condition Tracking and Vertex Search Diff: vx (tracking &vertex search) - dx Vertex Search (first point from simulation) Diff: vx (vertex search) - dx x [cm] Simulation Condition : 0. 8 < PK 0 < 1. 1 [Ge. V/c] 0. 5 < cosq. K 0 < 1. 0 Not So Good

Simulation Condition Tracking and Vertex Search Diff: vx (tracking &vertex search) - dx Vertex Search (first point from simulation) Diff: vx (vertex search) - dx x [cm] Runge-Kutta Step Size 1. 0 Simulation Condition : 0. 8 < Eg < 1. 1 [Ge. V] Isotropic in CM frame Vacuum of all materials Two peak is distinguished

Step Size of Runge-Kutta Vertex Search (first point from simulation) Step Size 1. 0 Simulation Condition : 0. 8 < Eg < 1. 1 [Ge. V] Isotropic in CM frame Vacuum of all materials Step Size 0. 5 Strongly dependence on step size of Runge-Kutta Step Size 0. 25 Step Size 0. 1 I think Runge-Kutta : not so bad Interpolate : bad

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

New Vertex Method Vertex Search (first point from simulation) Simulation Condition : 0. 8 < Eg < 1. 1 [Ge. V] Isotropic in CM frame Vacuum of all materials Enough Performance 1 st Runge-Kutta(ss 1. 0) : Search the nearest points 2 nd Runge-Kutta : one more time from pre-pre points using smaller ss pre ss 0. 05

NKS 2 -2 = NKS 3

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

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

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

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

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 -> Too small pluses, under the Vth

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

HV dependence : TDC HV : 1900 V, Vth : - 3 V rising #run 2043 falling HV : 2100 V, Vth : - 3 V rising #run 2044 falling Not So Bad Not enough HV ? ? ? More Need ? ? ? HV : 2000 V, Vth : - 2. 5 V rising #run 2063 falling

Width%TDC Vol. 3 : VC HV : 2100 V, Vth : - 3 V Red Region : HV ~2000 V, Vth -2. 5 V NOT Modify @HV～ 2000 V, Vth -2. 5 V

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

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

Channels Correlation ch 43%ch 41 AMT 20 ch 42 [ch] AMT 20 ch 43 [ch] ch 42%ch 41 AMT 20 ch 41 [ch] Next Channel What is this correlation ? ? ?

Channels Correlation Next Channel ch 42%ch 41 AMT 20 ch 42 [ch] ch 42%ch 41 AMT 20 ch 41 [ch] Width Cut : Width < 50 ch Selected Region

Number of Hits B : rising #hits R : #hits @ width < 50 ch ………… ! No Comment !!

Number of Hits @TDC<750 B : rising #hits R : #hits @ width < 50 ch ! Different Shapes !!

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

Event Display Just a Moment, Please !!!