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STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 1
Final design and plan for LMRPC production
Outline:• LMRPC structure• Material• Production procedure and QC• Performance test• Time schedule
Wang Yi on behalf of Tsinghua and USTC
Department of Engineering Physics,Tsinghua University
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 22
A large area of muon telescope detector (MTD) at mid-rapidity, allows for the detection of•di-muon pairs from QGP thermal radiation, quarkonia, light vector mesons, possible correlations of quarks and gluons as resonances in QGP, and Drell-Yan production
•single muon from the semi- leptonic decays of heavy flavor hadrons
•advantages over electrons: no conversion, much less Dalitz decay contribution, less affected by radiation losses in the detector materials, trigger capability in Au+Au
•trigger capability for low to high pT J/ in central Au+Au collisions excellent mass resolution, separate different upsilon states e-muon correlation to distinguish heavy flavor production from initial lepton pair production
STAR Muon Telescope Detector
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 33
Concept of Design of the STAR-MTD
A detector with long-MRPCs covers thewhole iron bars and leave the gaps in- between uncovered. Acceptance: 45% at ||<0.5
117 modules, 1404 readout strips, 2808 readout channels
Long-MRPC detector technology, HPTDCelectronics (same as STAR-TOF)
Inner glass: 549 mm × 870 mm
Licron electrode: 549 mm × 880 mmOuter glass: 559 mm × 890 mm
Mylar layer: 564 mm × 895 mmHoneycomb: 559 mm × 890 mm
PC board: 580 mm × 915 mm
Strip: 38 mm × 870 mmInterval: 6 mm
Spacer: fishing lineGas gap: 0.25 mm
Inner glass: 0.7 mmOuter glass: 1.1 mm
PC board: 0.9 mm honeycomb: 10 mm
Mylar: 0.15 mm Strip: 0.035 mm
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 4
MTD requirements:
• Time resolution less than 100 ps, spatial resolution ~ 1 cm.
• The mechanics design must allow a convenient replacement of
individual MTD box and access to the BEMC box.
• The system must be able to operate in the fringe field from 0.5 Tesla
STAR magnet field.
• The system must operate at low noise rate. The total noise rate should
be less than 0.5 M Hz, 1 Hz/cm2.
• The system must be safe, meet all BNL safely requirements.
• The system must not impair the performance of other STAR detectors.
MTD System Requirement
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 5
Inner glass: 549 mm × 870 mm
Licron electrode: 549 mm × 880 mmOuter glass: 559 mm × 890 mm
Mylar layer: 564 mm × 895 mmHoneycomb: 559 mm × 890 mm
PC board: 580 mm × 915 mm
Strip: 38 mm × 870 mmInterval: 6 mm
Spacer: fishing lineGas gap: 0.25 mm
Inner glass: 0.7 mmOuter glass: 1.1 mm
PC board: 0.9 mm honeycomb: 10 mm
Mylar: 0.15 mm Strip: 0.035 mm
Structure of LMRPC module
For assuring the stable performance, we will compare the performance between 5 and 6 gaps modules.
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 6
Structure of LMRPC module
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 7
76 78 80 82 84 86 88 90 92 94 96 98 10030
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
Efficiency @ Freon/iso-Butane/SF6 : 95%/ 5%/0% Time resolution @ 95%/5%/0% Efficiency @ 94%/ 5%/1% Time resolution @ 94%/ 5%/1%
E (kV/cm)
Effi
cien
cy (%
)
95%
70
75
80
85
90
95
100
105
110
115
120
Tim
e resolu
tion (p
s)
78 80 82 84 86 88 90 92 94 96 98 100 102 10450
55
60
65
70
75
80
85
90
95
100
Efficiency Time resolution
E (kV/cm)
Effi
cien
cy (%
)
60
70
80
90
100
110
120
Tim
e resolu
tion (p
s)
95%
Performance of LMRPC
Cosmic ray test Beam test
Time resolution ~ 70ps, efficiency> 95%
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 8
94%Freon/5%iso-butane/1% SF695%Freon/5%iso-butane
Noise < 0.6 Hz/cm^2 @ 7200V Noise < 0.4 Hz/cm^2 @ 7200V
Noise level @different gas mixture
LMRPC meets the MTD requirement!
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 9
Material Type and manufacturer Dimension (mm) Tolerance (mm) Quantity
Outer glass Beijing 8905591.1 ±0.5, ±0.5 ,±0.02 2
Inner glass Bejing 8705490.7 ±0.5, ±0.5, ±0.02 5
Graphite electrode Colloidal graphiteSR~4 Mohm/
888×557×0.1 -0.5 2
Mylar film Dupont Corp. 895×564×0.15 ±0.1 2
Honeycomb board Aoxing Corp. 890×559×10 ±1.0, ±1.0 2
PCB ShengYi Corp.G10
915×580×0.912strips, 38×870/strip
±0.5 2
L-shaped and cylinder supporter
Weishi Corp.Polycarbonate
height:4.8 -0.05 12
Nylon wire Japan Diameter 0.25 ±0.005
RTV CAF4, France
HV lead 15kV, USA 60cm ±1 2
Signal lead 34 ribbon cable, USA 60cm ±1 4
The materials for one LMRPC module
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University
Chinese LMRPC production
• The LMRPC production is the same as STAR-TOF MRPC production, we have two production sites in China.
Tsinghua University (60%) University of Science and Technology of China (40%)
• Facilities and tools ensure quality.
• Each site with QA and testing facility.
• Web-based module-data-base accessible at the assembly sites.
10
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 1111
1/2 3/4 5/6 7/89/1011/121/2 3/45/6 7/8 9/1011/12
Plan 2011 2012
Start20 LMRPCs40 LMRPCs60 LMRPCs80 LMRPCs
100 LMRPCs115 LMRPCs
LMRPC manufacture milestones
11
VECC will produce 10% (15 ) modules
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 12
Inner glass
outer glass
Mylar Honeycombboard
PCB Graphite Nylonwire
…
Material procurement
CheckElectrodeassembly
Yes
LMRPCassembly
Check distanceBetween PCBSolder signal
cable
Yes
No
Check continuity
No
Final check
Test amplitude and time
LabelYes Yes
Yes
NoNo
No
Procedures of construction and QC
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 13
Quality control on the material
• Glass– Measure the dimensions – Check the surface quality
• Pcb– Dimensions, – the scratch on the strips
• Honeycomb – Dimensions, surface quality
• Mylar foil: thickness, holes
• Fishing line– Dimension check of each coil
• Support block: thickness
Material with faults will be returned back to factory.
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 14
HV cables and signal connection
• Rice and UT Austin will provide us HV and signal cables
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 15
MRPC put in box
Exercise time: 10 hoursHV:±7200V
Measure current & noise rate
Measure QDC & TDC 24×3 hours
Flushing with gas 48 hours, 100ml/min
LMRPC Testing Procedure
For the first batch of
LMRPC modules (about 20
modules), 100% strips will
be tested for efficiency and
time resolution.
Later, 33% strips will be
tested.
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University
Nominal Minimum Maximum
Length 915mm 914.2mm 915.8mm
Width 580mm 579.2mm 580.8mm
Thickness 30mm 28.5mm 31.5mm
LMRPC mechanical specifications
16
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University
Testing conditions Specifications
Working gas: 95% F134A+5% iso-butane
Leakage current: < 40 nA
HV: 14.4kV Noise rate: < 1Hz/cm2
FEE threshold: 30mV Efficiency : > 90%
Timing resolution < 120 ps for 90% strips
MRPC performance requirement
17
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 18
Time schedule• 2011.4 – 2011.6 finalizing the design
Design modules with 5 and 6 gaps, test performance, detailed comparison.
Make a conclusion on the performance of different structure
with/without glue.
Help VECC to establish test system, production tools and some materials…
Module production:
• 2011.6 – 2011.12 20%
• 2012.1 – 2012.6 40%
• 2012.7 – 2012.12 40%
STAR-MTD workshop@USTC, March 30th-April 1th , 2011Wang Yi, Tsinghua University 19