Timing properties of MCP-PMT K.Inami (Nagoya university, Japan) - Time resolution - Lifetime - Rate dependence Photon Detector Workshop at Kobe, 27-29.

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Presentation transcript:

Timing properties of MCP-PMT K.Inami (Nagoya university, Japan) - Time resolution - Lifetime - Rate dependence Photon Detector Workshop at Kobe, June 2007

2007/6/27-29 Photon Detector WS at Kobe2 Introduction Photon device for TOP counter Cherenkov ring imaging counter with precise timing measurement (NIM A 440 (2000) 124) Barrel PID upgrade for Super B factory Single photon sensitivity Good transit time spread (TTS<50ps) Operational under 1.5T B-field Position sensitive (~5mm) High detection efficiency MCP-PMT is a best solution!

2007/6/27-29 Photon Detector WS at Kobe3 MCP-PMT Micro-Channel-Plate Tiny electron multipliers Diameter ~10  m, length ~400  m High gain ~10 6 for two-stage type  Fast time response Pulse raise time ~500ps, TTS < 50ps can operate under high magnetic field (~1T) Channel ~400  m  ~10  m Single photon

2007/6/27-29 Photon Detector WS at Kobe4 MCP-PMT for single photon Timing properties under B=0~1.5T parallel to PMT HPK6 BINP8 HPK10 Burle25 MCP-PMTHPK6 R3809U-50-11X BINP8 N4428 HPK10 R3809U-50-25X Burle PMT size(mm) x71 Effective size(mm) x50 MCP hole diameter(  m) Length-diameter ratio Bias angle (deg.) Max. H.V. (V) photo-cathodemulti-alkali bi-alkali Q.E.(%) ( =408nm)

2007/6/27-29 Photon Detector WS at Kobe5 MCP-PMT for single photon (2) Setup Single photon is generated by laser (408nm). B-field is parallel to tube axis. 18GHz 0~10dB 1.5GHz 36dB Philips 708 HPK PLP-02 Width 36ps

2007/6/27-29 Photon Detector WS at Kobe6 MCP-PMT (output) Window size : 25mm  HPK10  =46ps for single photon single photon peak Hamamatsu R3809U-50 (multi-alkali photo-cathode) HPK6 Window : 11mm  MCP hole 10  m  MCP hole 6  m  Gain ~ 10 6

2007/6/27-29 Photon Detector WS at Kobe7 Pulse response Pulse shape (B=0T) Fast raise time (~500ps) Broad shape for BINP8 Due to mismatch with H.V. supply and readout cable No influence for time resolution Gain v.s. B-field Small hole diameter shows high stability against B-field. Explained by relation btw hole size and Larmor radius of electron motion under B-field.

2007/6/27-29 Photon Detector WS at Kobe8 MCP-PMT in B-field ADC spectra with different angles under B=1.5T Gain depends on the angle. Behaviors are slightly different. Because of the different bias angle of MCP hole HPK6: 13deg, 6  m, BINP8: 5deg, 8  m HPK6 BINP8 B 

2007/6/27-29 Photon Detector WS at Kobe9 Time response TTS v.s. B-field Small hole diameter shows high stability and good resolution. TTS v.s. Gain For several HV and B-field conditions 30~40ps resolution was obtained for gain>10 6 Hole size need <~10  m to get time resolution of ~30ps under 1.5T B-field. Single photon

2007/6/27-29 Photon Detector WS at Kobe10 Lifetime How long can we use MCP-PMT under high hit rate? (Nucl. Instr. Meth. A564 (2006) 204.) Light load by LED pulse (1~5kHz) 20~100 p.e. /pulse (monitored by normal PMT) HPK (x2)Russian (x5) Al protectionOXOX Correction eff.37%65% % Effective area11mm  18mm  Gain1.9x x10 6 3~4x10 6 TTS34ps29ps30~40ps Photo-cathodeMulti-alkali (NaKSbCs) Quantum eff. at 400nm21%19%16-20% Bias angle13deg5deg

2007/6/27-29 Photon Detector WS at Kobe11 Relative Q.E. by single photon laser Without Al protection Drop <50% within 1yr. With Al protection Long life Not enough for Russian PMTs Enough lifetime for HPK’s MCP-PMT with Al protection layer Lifetime - Q.E. -

2007/6/27-29 Photon Detector WS at Kobe12 Lifetime - Q.E. vs wavelangth - Q.E. after lifetime test (Ratio of Q.E. btw. before,after) Large Q.E. drop at longer wavelength Number of Cherenkov photons ； only 13% drop (HPK w/Al) Number of generated Cherenkov photon:~1/ 2

2007/6/27-29 Photon Detector WS at Kobe13 Lifetime - Gain - Estimate from output charge for single photon irradiation <10 13 photons/cm 2 Drop fast >10 13 photons/cm 2 Drop slowly Single photon detection: OK Can recover gain by increasing HV

2007/6/27-29 Photon Detector WS at Kobe14 Lifetime - T.T.S. - Time resolution for single photon  No degradation! Keep ~35ps Russian w/o Al (#6) HPK w/o Al Russian w/ Al(#32) HPK w/ Al － before － after  =31ps  =36ps  =43ps  =32ps  =34ps  =29ps  =33ps

2007/6/27-29 Photon Detector WS at Kobe15 Multi-anode MCP-PMT (1) Size27.5 x 27.5 x 14.8 mm Effective area22 x 22 mm(64%) Photo cathodeMulti-alkali Q.E. ~20%( =350nm) MCP Channel diameter 10  m Number of MCP stage2 Al protection layerNo Aperture~60% Anode4 channel linear array Anode size (1ch)5.3 x 22 mm Anode gaps0.3 mm R&D with Hamamatsu for TOP counter SL10 Large effective area64% by square shape Position information4ch linear anode (5mm pitch)

2007/6/27-29 Photon Detector WS at Kobe16 Multi-anode (2) Single photon detection Fast raise time: ~400ps Gain=1.5x10 T.T.S.(single photon): Position resoltion: <5mm Correction eff.: ~50% Nucl. Instr. Meth. A528 (2004) 768. Basic performance is OK! Same as single anode MCP-PMT Raise time ～ 400ps T.T.S.:  ~30ps

2007/6/27-29 Photon Detector WS at Kobe17 Rate dependence Gain vs. photon rate For high intensity beam Gain drop for high rate >10 5 count/cm 2 /s Due to lack of elections inside MCP holes Depending on RC variables SL10HPK6BINP MCP resistance (M  cm 2 ) ~1000 MCP capacitance (pF/cm 2 ) ~39 Enough for TOP counter

2007/6/27-29 Photon Detector WS at Kobe18 High resolution TOF Structure Small-size quartz (cm~mm length) Cherenkov light (Decay time ~ 0) extremely reduce time dispersion compared to scintillation (  ~ ns) MCP-PMT (multi-alkali photo-cathode) TTS ~ 30ps even for single photon gives enough time resolution for smaller number of detectable photons Readout electronics  elec. : 4ps Time-correlated Single Photon Counting Modules (SPC-134, Becker & Hickl GMbH’s ) CFD, TAC and ADC Channel width = 813fs Electrical time resolution = 4ps RMS Test counter

2007/6/27-29 Photon Detector WS at Kobe19 Beam test setup 3GeV/c   beam at KEK-PS  2 line PMT: R3809U-50-11X Quartz radiator 10  x40 z mm with Al evaporation Elec. resolution

2007/6/27-29 Photon Detector WS at Kobe20 Beam test result With 10mm quartz radiator +3mm quartz window Number of photons ~ 180 Time resolution = 6.2ps Intrinsic resolution ~ 4.7ps Without quartz radiator 3mm quartz window Number of photons ~ 80 Expectation ~ 20 photo-electrons Time resolution = 7.7ps

2007/6/27-29 Photon Detector WS at Kobe21 Summary MCP-PMT studies Good time resolution of ~35ps for single photon Even under B=1.5T Gain~10 6 with <10  m MCP hole Long lifetime (<10% QE drop) until 3x10 14 photons/cm 2 Need Al protection layer Gain degradation if N det >10 5 counts/cm 2 /s Enough performance for TOP counter in super B factory High resolution TOF; ~5ps time resolution An apprication of fast MCP-PMT References M. Akatsu et.al., Nucl. Instr. Meth. A528 (2004) 768. K. Inami et.al., Nucl. Instr. Meth. A560 (2006) 303. N. Kishimoto et.al., Nucl. Instr. Meth. A564 (2006) 204.