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Different Detectors for Time Correlated Single Photon Counting
G. Rehm
DEELS workshop
ESRF, 12-13 May 2014
Overview
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 2
• 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
MCP-PMT IRF short scale
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 3
-1 -0.5 0 0.5 1 1.510
0
101
102
103
104
105
106
107
time [ns]
counts
Datasheet Our measurement with pulsed laser
MCP-PMT IRF long scale
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 4
0 50 100 150 200 250 30010
0
101
102
103
104
105
106
107
108
time [ns]
counts
Delayed pulses, physics not understood
Afterpulsing Counting deadtime 88ns
SPAD v MCP-PMT
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 5
Delayed pulses: ‘diffusion tail’ from red photons
Afterpulsing
SPAD white v blue
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 6
Diffusion tail can be suppressed. No impact on afterpulsing.
SPAD v PMA
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 7
Afterpulsing after deadtime
SPAD v PMA v X-ray APD
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 8
Detector Comparison
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 9
Detector IRF FW 10e-1 [ps]
IRF FW 10e-5 [ps]
Dark Counts [1/s]
After-pulsing [%]
Cost (Year)
Remarks
MCP-PMT R3809U-50
100 1250 1 0.5 GBP12000 (2005)
External HV
SPAD id-100-50
170 19000 white 800 blue?
60 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+1550 (2013)
120V supply
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
DEELS, 12-13 May 2014, Different Detectors for TCSPC, G.Rehm 12
• Hybrid PMA best visible photon detector, but X-ray 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.
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