LDS Saturation Studies for Horizontal Drift - INDICO-FNAL (Indico)
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LDS Saturation Studies for Horizontal Drift Haowei Zheng, Andrzej Szelc, Patrick Green 1
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Transcript of LDS Saturation Studies for Horizontal Drift - INDICO-FNAL (Indico)
LDS Saturation Studies for Horizontal Drift
Haowei Zheng, Andrzej Szelc, Patrick Green
1
Introduction
• Studying saturation effect of LDS on horizontal drift geometry• Using real detector response data with simulated photon rate• Currently using liquid argon with xenon doping• Supports different geometries with minor tweaks• Code will be available on Github
2
Horizontal Drift Geometry & PDS
• 480 PDs, all mounted on x = 0cm• Scaled down TPC geometry• 5<x<360cm, -600<y<600cm,
0<z<1400cm (1X2X6 APAs)• PD size: (Y)9.3cm (Z)40cm• Only direct VUV light considered,
reflected light is ignored
3
Method
• Choose detector in the middle to avoid edge effects• Simulate response from one event
by one detector using convolution• Using realistic response functions
received from A. Falcone• Do this for evenly distributed events
across a 2D plane• Obtain heatmap & saturation areas
0
0.5
1
1.5
2
2.5
3
3.5
4
X-Y Heat Map for peak voltages
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Heat Map for peak voltages
4
HRQ50_3ov
Algorithm• Run modified semi-analytic light
simulation with evenly distributed events in X-Y or X-Z planes• Obtain events that occur in the
region of interest (100*360cm)• Convolve to get response
function• Plot the maximum response
voltage with event location as heatmaps• Apply threshold to obtain
saturation region
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0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200time (ns)
0.5-
0
0.5
1
1.5
2
2.5
3
3.5
Volta
ge (V
)
XARAPUCA Response From One Fixed Energy Event
Figure: example of a convoluted waveform from a high energy event near the PD
Threshold: 0.8V
• Assuming argon is xenon doped:• argon fast component remains argon• argon slow component converted to Xe wavelength with 100% efficiency.
• Argon fast component is o(7ns), xenon components are o(4ns) and and o(22ns). Combined with transport effects gives a timescale ~50ns• Rising time of response function ~100ns-> majority of light concentrated at the very start of the signal.
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Heatmaps—Y Direction
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
X-Y Heat Map for peak voltages
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Heat Map for peak voltages
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0
2
4
6
8
10
12
14
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X-Y Heat Map for peak voltages
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Heat Map for peak voltages
10MeV
100MeV
Note the light maps are not plotted to the same scale. This is why they look similar even though they are different energies.
The heatmaps show the maximum detector voltage change by events originating in the X-Y plane
Saturation—Y Direction
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Y Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Y Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Y Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Y Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in y
(cm
)
X-Y Saturated Region
10MeV 25MeV
50MeV 100MeV
8
The blue region in the map is where only some events saturate
The distance between PDs in Y direction is 62cm, meaning large energy events might saturate multiple detectors
Heatmaps—Z Direction
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
X-Z Heat Map for peak voltages
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Heat Map for peak voltages
9
2
4
6
8
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12
14
16
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X-Z Heat Map for peak voltages
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Heat Map for peak voltages
10MeV
100MeV
Note the light maps are not plotted to the same scale. This is why they look similar even though they are different energies.
Saturation—Z Direction
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Z Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Z Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Z Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Saturated Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
X-Z Saturated Region
50 100 150 200 250 300 350drift distance (cm)
50-
40-
30-
20-
10-
0
10
20
30
40
50
dist
ance
in z
(cm
)
X-Z Saturated Region
10MeV 25MeV
50MeV 100MeV
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The distance between PDs in Z direction is 48.8cm, meaning large energy events might saturate multiple detectors. Saturated region is wider due to the rectangular PD being wider in Z direction.
Conclusion
• Saturation depends on detector shape and orientation, in particular, X-Z plane is more saturated than X-Y plane• Different detector configuration
may reduce saturation by changing the response function• Code will be available on github
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Code
• Original semi-analytic light simulation: https://github.com/pgreen135/scintillation_toy_mc• Modified light simulation with evenly distributed event generation: to
be uploaded• Event selection and response convolution code: to be uploaded
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