NKS2 Meeting 2008/10/16
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Transcript of NKS2 Meeting 2008/10/16
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K. Futatsukawa
NKS2 Meeting
2008/10/16
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NKS2
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Simulation ResultSimulation ResultTracking and Vertex Search
Vertex Search (first point from simulation)
x [cm]
Diff: vx (tracking &vertex search) - dx
Diff: vx (vertex search) - dx
vx : vertex point x dir. from analyzerdx : decay point x dir. from simulation
Tracking is cause,but program resolution of vertex search is not so good
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Step Size of Runge-KuttaStep Size of Runge-Kutta
Strongly dependence on step size of Runge-Kutta
Not Only RMS but also Mean, Tail
Vertex Search (first point from simulation)
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Simulation ConditionSimulation ConditionTracking and Vertex Search
Vertex Search (first point from simulation)
x [cm]
Diff: vx (tracking &vertex search) - dx
Diff: vx (vertex search) - dx
Simulation Condition : 0.8 < PK0 < 1.1 [GeV/c] 0.5 < cosK0 < 1.0Not So Good
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Simulation ConditionSimulation ConditionTracking and Vertex Search
Vertex Search (first point from simulation)
x [cm]
Diff: vx (tracking &vertex search) - dx
Diff: vx (vertex search) - dx
Simulation Condition : 0.8 < E < 1.1 [GeV] Isotropic in CM frame Vacuum of all materialsRunge-Kutta Step Size 1.0
Two peak is distinguished
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Step Size of Runge-KuttaStep Size of Runge-Kutta
Step Size 1.0
Step Size 0.5
Step Size 0.25
Step Size 0.1
Simulation Condition : 0.8 < E < 1.1 [GeV] Isotropic in CM frame Vacuum of all materials
Strongly dependence on step size of Runge-Kutta
I think Runge-Kutta : not so bad Interpolate : bad
Vertex Search (first point from simulation)
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New Vertex MethodNew Vertex Method
Vertex Search : Runge-Kutta Method
Nearest Points
Pre-Points
Pre-Pre Points
1st Runge-Kutta(ss1.0) : Search the nearest points2nd Runge-Kutta : one more time from pre-pre points using smaller ss
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New Vertex MethodNew Vertex Method
Simulation Condition : 0.8 < E < 1.1 [GeV] Isotropic in CM frame Vacuum of all materials
Vertex Search (first point from simulation)
Enough Performance
pre ss0.05
1st Runge-Kutta(ss1.0) : Search the nearest points2nd Runge-Kutta : one more time from pre-pre points using smaller ss
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NKS2-2 = NKS3
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CAMAC ScalerCAMAC Scaler
1 m
Wanted : No Target, No Radiator Data
Left > RightWhy ???From Upstream, Beam line
#run 2063
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[ch]
Not like this !!!
We can’t separate signals from noisesOrNoises level was too less
nois
es
sign
als
Width of Discriminated Signalsabs |falling – rising| Expected Shape
Width : VCWidth : VC
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Width%TDC : VCWidth%TDC : VC
X axis : TDC [ch]Y axis : Width [ch]
?…??…….???No Comment !!!
Projection to X dir. in Next Page
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ProjectionX : VCProjectionX : VC
X axis : TDC [ch]
W:0~20 W:20~40 W:40~60 W:60~80
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)
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Width%TDC Vol.2 : VCWidth%TDC Vol.2 : VC
Same graphsFrom ScatterTo Contour
No signals in this region
far from s-wires
Hypothesis :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
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Rising ?, Falling ?, Leading ?, Trailing ?Rising ?, Falling ?, Leading ?, Trailing ?
Rising : fr = 1
Falling : fr = 0
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
Rising
I am sorry for having mistake of namein UserDCMonitor.cpp
Bad Boys are this manual and Tsukada-san
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HV dependence : TDCHV dependence : TDCHV : 1900 V, Vth : 3 V HV : 2100 V, Vth : 3 V HV : 2000 V, Vth : 2.5 V
Not enough HV ??? More Need ???
Not So BadNot So Bad
#run 2043 #run 2044 #run 2063rising rising rising
falling falling falling
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Width%TDC Vol.3 : VCWidth%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
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Width%TDC Vol.3 : VCWidth%TDC Vol.3 : VC
HV : 2100 V, Vth : 3 V
… Attention Please !?
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Cross-TalkCross-Talk
The channels of no connect to VC don’t have signals
The cross-talk is too less @ASD & AMT-TDC
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Channels CorrelationChannels Correlation
AMT20 ch 41 [ch] AMT20 ch 41 [ch]
AM
T20
ch
42
[ch
]
AM
T20
ch
43
[ch
]
Next Channel Next Next Channel
What is this correlation ???
ch42%ch41 ch43%ch41
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Channels CorrelationChannels Correlation
AMT20 ch 41 [ch] AMT20 ch 41 [ch]
AM
T20
ch
42
[ch
]
AM
T20
ch
42
[ch
]
Next Channel
Width Cut : Width < 50 ch
Selected Region
ch42%ch41 ch42%ch41
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Number of HitsNumber of Hits
B : rising #hitsR : #hits @ width < 50 ch
………… No Comment !!!
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Number of Hits @TDC<750Number of Hits @TDC<750
B : rising #hitsR : #hits @ width < 50 ch
Different Shapes !!!
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Number of HitsNumber of Hits
Rising
R : #hits @ 1100 < tdc < 800B : #hits @ 300 < tdc < 600
We can’t get the informationform #hits
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Event DisplayEvent Display
Just a Moment, Please !!!