Photodetector Timing Resolution Burle Micro-Channel Plate Photo Multiplier Tubes (MCP-PMTs)
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Transcript of Photodetector Timing Resolution Burle Micro-Channel Plate Photo Multiplier Tubes (MCP-PMTs)
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Photodetector Timing Resolution
Burle Micro-Channel Plate Photo
Multiplier Tubes (MCP-PMTs)
H. Wells Wulsin
SLAC Group B
Winter 2005
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31 March 2005 H.W. Wulsin 2
Photo Multiplier Tube Specifications
DIRC PMT 2x2 MCP-PMT
Pixel Size ~2.8 cm ~24 mm
Timing resolution (σ)
1.6 ns [single photo-electrons]
•80-100 ps [single photoelectrons]•30-50 ps [test beam: ~60 photoelectrons]
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31 March 2005 H.W. Wulsin 3
End Station A Setup
PiLas laser, 635 nm (int. trigger)
Myl
ar
atte
nuat
ors
Electronics:•ADC•Single threshold discriminator •TDC (25 ps/cnt)
Quartz barsPad 0
Pad 2
Pad 1
Pad 3
Burle MCP-PMT
Path of test beam
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31 March 2005 H.W. Wulsin 4
Limits to MCP Timing Resolution
Cross-talk between channels Charge-sharing between pads Electronics noise Avalanche fluctuations [focus of this analysis]
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31 March 2005 H.W. Wulsin 5
Timing resolution varies with ADC
• TDC measures hit time when pulse exceeds level set by single threshold discriminator.• Size of pulse (# photoelectrons) affects the measured hit time. • More photoelectrons reduce the variability of measured hit time (avalanche fluctuations have a smaller effect).
Single photoelectron pulses (2 mV/div) ~300 photoelectrons / pulse (200 mV/div)
Threshold Threshold
1 ns
1 ns
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31 March 2005 H.W. Wulsin 6
ADC Distribution of Runs 1-8, taken 11-22-04, 11-24-04
Ent
ries
ADC (counts)
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31 March 2005 H.W. Wulsin 7
TDC v. ADC, Runs 1-8
ADC (counts)
ADC
TD
C (
coun
ts)
TD
C
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31 March 2005 H.W. Wulsin 8
TDC Histogram, Runs 1-8en
trie
s
TDC (counts)
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31 March 2005 H.W. Wulsin 9
Linear fit to Run 8
TDC = -0.0209(ADC) + 640.1
ADC (counts)
TD
C (
coun
ts)
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31 March 2005 H.W. Wulsin 10
Linear correction to Run 8
ADC ADC
TDCTDC
entr
ies
TD
C
TD
C
entr
ies
σraw = 31.0 ps
σcorr = 30.0 ps
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31 March 2005 H.W. Wulsin 11
Linear fit to Run 7
TDC = -0.098(ADC) + 671.5
ADC (counts)
TD
C (
coun
ts)
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31 March 2005 H.W. Wulsin 12
Linear correction to Run 7
σraw = 53.5 ps
σcorr = 48.5 ps
ADC ADC
TDC TDC
TD
C
TD
Ce
ntr
ies
en
trie
s
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31 March 2005 H.W. Wulsin 13
Hyperbolic fit to Runs 1-6T
DC
(co
unts
)
ADC (counts)
TDC = 632.6 + 509.8 / (ADC – 258.6)
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31 March 2005 H.W. Wulsin 14
Hyperbolic correction to Runs 1-6
ADC ADC
TDC TDC
TD
Ce
ntr
ies
en
trie
sT
DC
σraw = 470 ps σcorr = 320 ps
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31 March 2005 H.W. Wulsin 15
Independent fits to three data sets
590.0
610.0
630.0
650.0
670.0
690.0
710.0
25
9
28
0
30
1
32
2
34
3
36
4
38
5
40
6
42
7
44
8
46
9
49
0
51
1
53
2
55
3
57
4
59
5
ADC (counts)
TD
C (
co
un
ts)
Linear: Run 8
Linear: Run 7
Hyperbolic: Runs 1-6
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31 March 2005 H.W. Wulsin 16
Optimized total fit
By Hand:TDC = 619 + 165/√(ADC – 262)
By Recursion:TDC = 619.2 + 160.7/√(ADC – 262.2)
590.0
610.0
630.0
650.0
670.0
690.0
710.0
259
278
297
316
335
354
373
392
411
430
449
468
487
506
525
544
563
582
ADC (counts)
TD
C (
cou
nts
)
Linear: Run 8
Linear: Run 7
Hyperbolic: Runs 1-6
Total Fit
ADC (counts)
TD
C (
cou
nts
)
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31 March 2005 H.W. Wulsin 17
Total correction for Runs 1-8
ADC
ADC ADC
ADC
TD
CT
DC
TD
CT
DC
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31 March 2005 H.W. Wulsin 18
Timing Resolution Correction: All Runs
FWHM ~ 50 counts ADC FWHM ~ 15 counts ADC
TDC (counts)TDC (counts)
en
trie
s
en
trie
s
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31 March 2005 H.W. Wulsin 19
Use Run 1 (maximum attenuation): ADC counts photoelectrons
Pedestal value: 265.4 counts ADC Single photoelectron mean ADC: 2.1 counts
ADC (counts)
en
trie
s
en
trie
s
No TDC Signal TDC Signal Recordedentries
ADC - Pedestal (counts)
entries
ADC (counts)
entries No TDC Signal TDC Signal Recorded
1 photoelectron = 2.1 counts ADC
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31 March 2005 H.W. Wulsin 20
Timing Resolution vs. Photoelectrons
Npe
σ (
ps)
σ (
ps)
σ = 9.08 + 214.61 / √(Npe – 0.45)
Npe
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31 March 2005 H.W. Wulsin 21
Comparison to Previous Analysis
photoelectronsphotoelectrons
Time resolution vs (ADC signal)Quartz bar pad 0
10
100
1000
0 50 100 150 200 250
ADC signal [photoelectrons]S
igm
a [p
s]
Sigma 1 rawSigma 1 corrected1/sqr(ADC signal) corrected1/sqr(ADC signal) rawSigma 1 power corrected1/sqr(ADC signal) power corrected
10
100
1000
0 50 100 150 200 250
Photoelectrons
Sig
ma
(ps) σTDC raw
σTDC corr
Fit Corr
Similar resolution spectrum
Wells Josef (different data runs)
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31 March 2005 H.W. Wulsin 22
Conclusions Achieved timing resolution of 30 – 50 ps for
~100 photoelectrons (Run 8) down to ~30 photoelectrons (Run 7).
Correction for timing – photon correlation most helpful in comparing disparate runs. For constant number of photoelectrons,
correction less useful. Further study:
Confirm # photoelectrons per ADC count. Examine charge-sharing between pads.
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31 March 2005 H.W. Wulsin 23
Thank you to all of Group B for your help all quarter!Thanks to all Group B for lots of help this quarter!