barrel pid upgrade k. inami (nagoya) ljubljana, hawaii, cincinnati and pid group - r&d status -...
TRANSCRIPT
Barrel PID upgrade
K. Inami (Nagoya)Ljubljana, Hawaii, Cincinnati
and PID group
- R&D status- Structure design- Prototype study
- Beam test- Photon detector- Electronics
- Design study- To do, cost estimation
2
Barrel PID upgrade
2.6m
1.2m
e-
8.0GeVe+
3.5GeV
Focusing DIRC / fTOP / iTOP Aerogel RICH
- PID () detectors; Focusing DIRC, fTOP, iTOP- Cherenkov ring imaging detectors with quartz- Locate in the current TOF region
3
Barrel PID options
Converging the detector design Wide bar (40~50cmW x 2cmT), focus mirror (R=5~7m) Shape of readout plane depends on the choice of photon detector
By A.Schwartz-san
(Nagoya) (Cincinnati)
(Hawaii)
4
Structure Quartz: 255cmL x 40cmW x 2cmT
Focus mirror at 47.8deg. to reduce chromatic dispersion
Multi-anode MCP-PMT Linear array (5mm pitch), Good time resolution (<~40ps) Measure Cherenkov ring image with precise timing information.
MCP-PMT
(TOP counter, Nagoya)
18 counters in
5
Structure design
Can locate iTOP standoff inside sBelle structure
(iTOP, M.Rosen-san, Hawaii)
CU
RR
EN
T
FU
TU
RE
TOP
iTOP16 modules in
6
Structure design Just started structure
design With KEK workshop engineer
Need optimization Use honeycomb plates etc.
(M.Rosen-san)
Deflection ~250um
Barrel Deflection with full Quartz Load ~1,150kg
Barrel Deflection with full Quartz ~1,230kg
Deflection ~300um
7
Prototype development Demonstration of the performance
Quartz radiator (Fused silica) ・ Flatness:<1.2m/m ・ Roughness:0.5nm
Photon detector ・ Time resolution ・ Efficiency
Filter (>400nm) ・ Suppression of chromatic dispersion
PMTquartz
Prototype overview
915mm400mm
20mmquartz
915mm400mm
20mm400mm
Glued Glued
20mm
(Nagoya)
8
Quartz radiator Check the quality for
time resolution Single photon pulse laser
=407nm MCP-PMT Several incident position
No degradation of time resolution
Enough quartz quality
Propagation length [mm]
Tim
e re
solu
tion
[ps]
Line 1Line 2Line 3<40ps
Quartz
MCP-PMT
47.2 deg. MCP-PMT
9
At Fuji beam line in June and Dec. Using real size quartz and MCP-PMT
MCP-PMT: Multi-alkali p.c., C.E.=60%
Check Ring image Number of photons Time resolution
Beam test
MWPC 1 MWPC 2
Lead glass + Finemesh PMT
Timing counter10mm quartz + MCP-PMTt0 < 15ps
MCP-PMT (56ch)
TOP counterQuartz bar(1850×400×20mm)
Trigger counter
Quartz + support jig
10
Beam test results Ring Image
Similar with Simulation Number of photons
Ave. number of photons; 15.7as expected
Time resolution
1st 2nd
3rd 1st 2nd
3rd
[1count/25ps] [1count/25ps]
Data Simulation
Resolution(1st peak)
Data 76.0±2.0 [ps]
Simulation
77.7±2.3 [ps]
11
Propagation length [mm]
Tim
e re
solu
tion
[ps]
Simulation
Check time resolution For several incidence condition and channel
Data agrees well with simulation expectation. Confirmed the level of chromatic dispersion effect
Time resol. vs. propagation length
12
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
[%]
13
Lifetime issue Lifetime test
Multi-alkali p.c. with Al protection With square-shape MCP-PMT Short lifetime, position dependence
Difference with round-shape PMT Enough lifetime (>10 super-B year)
Need to confirm the lifetimeof round-shape MCP-PMT
Need to confirm the difference Internal structure
QE before againg
QE after againg
14
Lifetime with round shape MCP with 10m pore Multi-alkali p.c. Aluminum protection on 1st
MCP
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. Can expect to improve during
R&D in next year Output charge (mC/cm2)
Relative QE
Relative Gain
~3 super-B years
?
15
MCP-PMT R&D status Multi-alkali p.c. SL10
Added ceramic shield To protect gas feedback
Improved lifetime Obtained normal Gain and TTS Still need to irradiate more photons
and study detail Need to improve correction efficien
cy (~35% ~60%) Put Al protection layer on 2nd MCP Deliver April and May
GaAsP p.c. SL10 Change the process method
To improve yield rate Will add ceramic shield
Preliminary result from HPK
Old
New
16
Readout elec. R&D (Hawaii)
6.4 ps RMS
(4.5ps single)
Waveform sampling Comparable performance
to best CFD + HPTDC MUCH lower power, no
need for huge cable plant!
Using full samples significantly reduces the impact of noise
Integrated module
17
Readout elec. R&D
16k channels2k BLAB3128 SRM
128 DAQ fiber transceivers
32 FINESSE8 COPPER
All pieces have prototypes in existence or in fabrication
-- present performance results in July
Already~10% system
Fabbed
(Hawaii)
18
Design study Simulation studies
Handmade + Geant3 (K.Inami, Nagoya) Geant4 + ROOT (K.Nishimura-san, Hawaii) Mathematica, Handmade? (Cincinnati) Analytical calculation (M.Staric-san, Ljubljana)
Reconstruction program for gsim study
Standoff
2 readout
1 readout
19
Design study with ring image
Calculation with Mathematica Prefer to use wide bar and standoff, in order to obtain clear difference
of ring images
(Cincinnati)
20
Comparison btw. iTOP and fTOP For initial comparison purposes all assumptions are same… except
fTOP: No expansion length, 2 cm by 44 cm detector plane (SL10* PMT). iTOP: 3.6 cm expansion length to a 10 cm x 44 cm detector plane (SL10* PMT)
Separability comparable, slightly better with imaging. iTOP geometry optimization just started! Results may improve with optimization of
bar width/thickness, focusing length, chosen photon detector, etc.
20
iTOP fTOP
(Hawaii)
21
Performance check GaAsP, CE=35%, >400nm
10ps jitter
(Nagoya)
22
Performance checkWith 10ps jitter
GaAsP, CE=35%>400nm
Multi-alkali, CE=60%
>350nm
23
Simulation study
Similar results with Nagoya’s simulation
For B case, 2-readout type shows better results.
(M.Staric-san)
24
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 (by A.Schwartz-san, Cincinnati)
$72k x 3 x 16 + alpha ~ 3.7M$ From Taiwan (by C.H.Wang-san and P.Chang-san)
?? 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
LABRADOR; <$10/ch Structure
25
Summary Barrel PID based on TOP/DIRC
Cherenkov ring imaging with position and precise timing (<50ps) using Quartz + MCP-PMT
Wide bar (40~50cmW x 2cmT), focus mirror (R=5~7m) Shape of readout plane depends on the choice of photon detector Started structure design
Prototype study Expected performance by beam test Readout electronics with BLAB3 ASIC will be tested soon.
Photon detector Lifetime test with round shape and square shape MCP-PMTs
Seems manageable lifetime. Need to establish production reliability and lifetime
Design study With several simulation programs Need to obtain consistent result first
26
What to do Prototype study
Check ring image with focus mirror, quality of quartz radiators Electronics prototype performance
Design study Simulation programs showing consistent results
Design choice and optimization Robustness against multi-track events, beam BG
Effect to outer detector, again Material of standoff, structure Distance btw. radiator and ECL
Photon detector choice Lifetime for MCP-PMT
Test with square-shape MCP-PMT from Hamamatsu and Photonis Performance and production reliability
Hamamatsu vs. Photonis Determine the size Photo-cathode (GaAsP/Multi-alkali) By next
summer
27
Backup
28
Performance Full simulation with
GaAsP photo-cathode + Focusing mirror >400nm filter, CE=35%
29
Barrel PID detector Cherenkov ring in quartz bar
Reconstruct ring image using ~20 photons reflected inside the quartz radiator as a Babar’s DIRC.
Utilize 3D information Arrival position
(x,y) Arrival timing (t)
Difference of propagation time for is ~100ps