Different detectors for Tim-Corr. Single Photon Counting

Different Detectors for
Time Correlated Single Photon Counting
G. Rehm
DEELS workshop
ESRF, 12-13 May 2014
Overview
• So far, we’ve been using TCSPC to measure fill
pattern (precise charge in filled bunches) more than
single bunch purity.
• More beamlines are starting to use timing and hybrid
bunch, anticipate better bunch purity is required
• We are using a PicoHarp 300 with 65536 buckets of
32ps width, 65536 counts depth
• We have acquired various single photon detectors
over the years
–
–
–
–
Hamamatsu MCP-PMT R3809U-50
id-quantique SPAD id-100-50
PicoQuant Hybrid PMA
X-ray APD: Hamamatsu S2381 with Picosecond Pulse Labs
5530B bias tee and Femto HSA-X-1-40
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
2
MCP-PMT IRF short scale
Our measurement with pulsed laser
Datasheet
7
10
6
10
5
10
counts
4
10
3
10
2
10
1
10
0
10
-1
-0.5
0
0.5
1
1.5
time [ns]
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
3
MCP-PMT IRF long scale
8
10
7
10
6
10
Delayed pulses, physics not understood
5
counts
10
4
10
3
10
Counting deadtime 88ns
Afterpulsing
2
10
1
10
0
10
0
50
100
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
150
time [ns]
200
250
300
4
SPAD v MCP-PMT
Delayed pulses: ‘diffusion tail’ from red photons
Afterpulsing
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
5
SPAD white v blue
Diffusion tail can be
suppressed.
No impact on afterpulsing.
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
6
SPAD v PMA
Afterpulsing
after deadtime
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
7
SPAD v PMA v X-ray APD
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
8
Detector Comparison
Detector
IRF FW
10e-1
[ps]
IRF FW
10e-5
[ps]
Dark
Counts
[1/s]
Afterpulsing
[%]
Cost
(Year)
Remarks
MCP-PMT
R3809U50
100
1250
1
0.5
GBP12000
(2005)
External HV
SPAD
id-100-50
170
19000
60
white
800 blue?
1.2
CHF 4200
(2010)
Fully integrated,
TTL pulse out,
5V supply
Hybrid
PMA
150
1100
24
0.05
€10000
(2013)
Peltier cooled,
12V supply
X-ray APD
S2381
950
2500
0!
0?
GBP55+700+15
50 (2013)
120V supply
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
9
Injected v ‘Purified’ Single Bunch
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
10
Pile up correction
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
11
Summary/Open Issues
• Hybrid PMA best visible photon detector, but Xray photon APD is best of all (no news).
• Visible light also easy at lowest beam currents,
just take out ND filters.
• For X-ray APD, currently, need to chose threshold
for counting high, otherwise dark counts. Then
only 0.1 counts per turn at full current. Sees only
scatter from Al window.
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm
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