Updates at Nagoya univ.K.Inami (Nagoya)

- Photon detector R&D- Lifetime improvements

- Simulation design study

2009/7/7-9 B2GM 2

Photon detector R&D

• Square-shape multi-anode MCP-PMT– Multi-alkali photo-cathode– Gain=1.5x106 @B=1.5T– T.T.S.(single photon): ~35ps @B=1.5T– Position resolution: <5mm

• Semi-mass-production (14 PMTs)

σ=34.2±0.4ps

QE： 24%@400nm

Ave. QE： 17%@400nmTTS＜ 40ps for all channelsTDC [1count/25ps] Wavelength [nm]

QE

[%]

2009/7/7-9 B2GM 3

Lifetime issue

• Lifetime test with round-shape MCP-PMT– HPK R3809U– MCP with 10m pore– Multi-alkali p.c.– Aluminum protection on 1st MCP– Recent production: CT108X

• Initial Q.E.; 20% at 400nm• Initial Gain; 4x106

– TTS keeps <40ps.– Need to improve for initial Q.E. and

initial aging– Slope seems to be manageable.

• We can expect to improve during R&D.

Output charge (mC/cm2)

Relative QE

Relative Gain

~3 super-B years

2009/7/7-9 B2GM 4

R&D status

• Multi-alkali p.c. SL10– Added many protection for gas an

d ion feedback Improved lifetime

• ex. JT0087• Obtained normal Gain and TTS

– Even with improved correction efficiency (~35% ~60%)

• Put Al protection layer on 2nd MCP• ex. XM0007

• GaAsP p.c. SL10– HPK successfully produced with r

ather reliable process.– Still need the reduction of dark cur

rent and lifetime test.

Preliminary result from HPK

Old

New

Measured at Nagoya

1 B2year ~ 0.7C/cm2

QE before againg QE after againg

Old type

2009/7/7-9 B2GM 5

R&D status

• Prototype performance– 3 pieces from HPK

– QE: reasonable multi-alkali p.c.• Still need to improve

– Enough gain: ~5x105

– Reasonable TTS: =35~45ps– CE: ~55%

• Basic performance is OK.Lifetime test at Nagoya soon.New improved type will be ready at the

end of this month.

Cross-talk

QE at 400nm

TDC vs ADC

TDC after correction

XM0001

2009/7/7-9 B2GM 6

Cross-talk• XM0001; HV=–3400V

– Height of cross-talk pulse: 1/10 of signal– Similar wth previous studies

~80mV

~8mV

2009/7/7-9 B2GM 7

Design study

• Check performance for several designs– With actual effects

• MCP-PMT: QE, CE, TTS, dead space• Start timing fluctuation (25ps)

2-bar fTOP

1-bar fTOP

iTOP

2009/7/7-9 B2GM 8

Performance

Multi-alkali, CE=60%, >350nm

Efficiency

Fake rate

cos region Good Bad

2-bar 0~0.6 0.6~0.8

1-bar (iTOP) 0~0.3,0.6~ 0.3~0.6

2009/7/7-9 B2GM 9

Design consideration

• Trial to improve forward part• Apply focusing technique

– Bounce half of photons to be longer propagation length

– Really possible?focusing mirrorr = 98%R = 1.5m

half mirrorr = 50%, t = 50%

Matrix readout

2009/7/7-9 B2GM 10

Design study summary

• TOP performance for several condition– Two readout type

• Multi-alkali p.c. 2~3% fake-rate for 3~4GeV/c• GaAsP p.c. <2%• Start time fluctuation (25ps) >10% for forward part

– Maybe possible to improve

– One readout type• GaAsP p.c. 3~4%• Multi-alkali p.c. 4~6%

• Depends on the photon detector design– GaAsP p.c. Both type OK– Multi-alkali p.c. How many channels can we use?

2009/7/7-9 B2GM 11

Design study: to be considered

• Quartz bar– Size: (90~120) x (40~50) x 2 cm3

– Edge cut (chamfer): C 0.3~0.5 mm

– Flatness at glue point

– Deviation of refractive index

• MCP-PMT (SL10)– Size: 27.5 x 27.5 mm2(28x28 in realistic)

• Effective area: 22 x 22 mm2

– Channel: 4ch (Width:5.275mm, Gap:0.3mm) or 4x4ch

– Multi-alkali p.c., QE=25%@400nm

– Correction efficiency: 55% (60%)

– TTS: ~35ps (distribution)

2009/7/7-9 B2GM 12

Possible configuration with SL10

• 44cm width = 16MCP-PMTs• Max. 32 PMTs/module

– Because of cost limitation

• 4ch anode/PMT– Maybe, 4x4ch possible

• 2 types+ to be checked.

28mm pitch(22mm effective area)

16x2 SL10

16 SL10

2009/7/7-9 B2GM 13

Summary

• MCP-PMT R&D– Lifetime tests

• Round shape MCP-PMT shows manageable lifetime.• Square shape MCP-PMT

– Improved lifetime by adding many protection for gas and ion feedback

– Even with 2nd layer protection

• Design study– Confirmation with actual effects is in progress.

– Need to check the performance of possible design.

2009/7/7-9 B2GM 14

Discussion

• MCP-PMT is ready?– Hamamatsu SL10

• Multialkali p.c., CE=55%

• GaAsP p.c., CE=35%

– Photons MCP-PMT• Bialikali p.c. CE=60%?

– Basic performance is OK for both?• Check QE availability

– Lifetime is OK?• Hamamatsu: Probably OK from HPK and Nagoya study.

• Photonis: Look OK

• Need a few month to confirm.

– Cost and Production schedule?

2009/7/7-9 B2GM 15

Discussion

• Design studies converged?– Check with benchmark structure– Include actual effects

• Start timing fluctuation• Incident track fluctuation• Actual design of quartz and MCP-PMT

– Check PID performance for several incidence condition Feedback to structure study

– Check performance for some physics cases• With fsim• With gsim4 and analysis code

2009/7/7-9 B2GM 16

Discussion

• Structure studies– Show technically possible quartz layout and size

Feedback to simulation study

– Connection to ECL and CDC– Quartz support

• Honeycomb plates?

– PMT support• PMT maintenance possibility

– Discuss with KEK workshop

2009/7/7-9 B2GM 17

CAD from KEK workshop

2009/7/7-9 B2GM 18

Discussion

• Electronics– Readout and trigger

• BLAB3– Performance and data structure– Cost and schedule

• CFD ASIC?– Schedule– Readout TDC? On COPPER?

– HV system• Need ~500ch, HV<-4kV• CAEN HV system?

– LV system• How large?, How many ch?

2009/7/7-9 B2GM 19

Discussion

• Cost for several choice– Quartz

• Okamoto (Nagoya)• Zygo/OSI (Cincinnati)

– MCP-PMT• Hamamatsu (Nagoya)• Photonis (Hawaii? Ljubljana?)

– Electronics (Hawaii)– Structure (Hawaii, Nagoya)

2009/7/7-9 B2GM 20

Cost estimate & Production time

• Quartz bars– 16~18 modules (2x40x91.5cm3 x3 + mirror, standoff)– Okamoto optics (by Nagoya)

• 1800x18+2700 万円 ~ 3.6M$, 2 years– Zygo/OSI (by A.Schwartz-san, Cincinnati)

• $72k x 3 x 16 + alpha ~ 3.7M$

• Photon detector (increasing gradually)

– MCP-PMT by Hamamatsu; 600 pieces for TOP, 3 years• Multi-alkali photo-cathode; ~2.7M$

• GaAsP photo-cathode; ~4.2M$

– MCP-PMT by Photonis; ??? (expect cheaper price?)

• Electronics• Structure

2009/7/7-9 B2GM 21

Discussion

• Schedule toward 2013

2009/7/7-9 B2GM 22

Discussion

• Schedule toward technology choice– By the end of August

• Make list of possible options– In our case, MCP-PMT choice is important.

• Make performance catalogue for– MCP-PMTs

» QE, CE, TTS, Gain, Lifetime, – Detector configuration

» Separation power (eff./fake)» Robustness (beam BG, T0, tracking, photon loss)

– By the end of December• Decide detector configuration and technology

– Show test results» MCP-PMT lifetime, Simulation study, electronics test

To be Checkedby internal review committee?

2009/7/7-9 B2GM 23

Discussion

• Schedule in this year (Prototype production)– Make prototype with

• Zygo/OSI quartz• New support structure

• Photonis or HPK MCP-PMT• New electronics

– Check performance at KEK• First, make prototype of radiator (Quartz + support) and phot

on detector (MCP-PMT + Electronics) and check performance, individually.

by the end of this year

Make clean roomPrepare optical stageetc…