new small wheel muon trigger optical module new small wheel muon trigger optical module s. hou...
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New Small Wheel muon trigger optical moduleS. Hou 2014/08/29Academia Sinica
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Muon System
pT measurement : Monitored Drift Tube (MDT) Cathode Strip Chamber (CSC) Measure deflection by toroidal field
Barrel Trigger : Resistive Plate Chambers (RPC) Endcatp Trigger: Thin Gap Chambers (TGC)
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Challenges to ATLAS Phase-I upgrade LHC shutdown 14 months in 2018
Consolidation of injector chain, collimators Peak luminosity 3 × 1034 cm-2 s-1
Challenge to ATLAS TRIGGER RATE OVERBOUNDEvent pileup up to 80 per bunch crossing keep trigger threshold around 20-25 GeV muon pT thresholds not effective in the forward region higher EM ET thresholds in physics acceptance
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New Small Wheel upgrade
Multilayer chambers Kill fake triggers at Level-1 by IP pointing δθ ~ 1 mrad a trigger rate reduction ~6
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New Small Wheel detectors 16 sectors per wheel, each sector has 2x4 sTGC (Thin Gap Chambers) layers 2x4 MM (MicroMegas) layers
sTGC MicroMegas
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New Small Wheel trigger upgrade add NSW sTGC trigger muon track δθ < 1 mrad reduce noise tracks
ATLAS trigger limitsL1 : ~75 kHz maxL2 : ~3.5 kHz maxEF : ~200 Hz max
Forward muon trigger (kHz)at L= 3×1034
MU11 events selected analysis
Upgrade L1 with NSW
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NSW sTGC trigger circuits
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NSW sTGC router module
Repeater to clean and amplify signals from TDS FPGA selects active TDS signals to transmit Multi-rate transceiver to bump the signal speed to ~10 Gbps Optical Tx send out over fiber
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sTGC router optical transceiver1. Use VCSEL in TOSA 850 nm, MM, 10 GHz no fiber alignment issue, TOSA takes LC fiber connecter production is plainly PCB SMD process
2. Choice of GBLD or LOCld drivers
3. Joint Optical project of Phase-I LAr+NSW ? Requires approval LAr MTX is rad-hard, up to 8 Gbps (Xcheck?) LAr requires 5000 lines sTGC router is satisfied? Total 800 lines only QA, no R&D required Test fanout board, SMA to I/O
e.g. Kintex7, Scope
SMU MTX module
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Optical transceiver production, QC/QA
Manufacturers in contact1. Liverag.com.tw
Expertise on active optical products
Capable of >10Gbps modules, QA, circuits
2. FOCI.com.twExpertise on passive fiber assemblies
Jointly with SMU, a visit to manufacturersis planned in early October seeking all kind of collaboration opportunities and cost estimation
Laboratory setupBench test, scope for 10 GHz eye diagramBit Error Rate using Kintex7 boardRadiation tests, Co60 gamma, proton 30 MeV
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QA on VCSELs: Samples− VCSELs of various manufacturers
Die/Wire bonds by FOCI robot VCSEL dies on an 10×10 cm2 PCB
− TOSA of TrueLight assembled on PCB, no latch assembly
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DC light power measurements− V-I-L scan by a LabView setup
VCSELs covered by a large (10×10 mm2) GaAs PIN, Mechanical alignment is requiredNI 6024E PCMCIA to an XP notebook
− Power meter measurement
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DC bias to VCSELS− DC bias by Agilent E3631A, Keithley 2304A
current kept at ~ 5 mA/ch
− Bias at 1.65 V, 1.75 V, 2.0 V, to VCSELs
channel current measured, bundled.
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85/85 chamber − Temperature stable at 0.1 oC− Humidity stable at 0.2% RH− Cooled to 30/55 before opening, to prevent condensation
Burn periods conducted30/50 : 118 hrs85/85 : 12 hrs85/85 : 94 hrs85/85 : 275 hrs85/85 : 316 hrs85/85 : 363 hrsContinuing..
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Reference samples− Not in oven, to examine
the systematics of DAQ− Join afterwards, DAQ with test samples
1F45
1F59 1F59
1F58 1F58
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Reference samples− FINISAR 2092-001 5 Gb− board 2, two 4x1 arrays
VCSELS are not centered at PINMechanical alignment is an issue
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TOSA samples are robust in 85/85 TrueLight TOSA
1F45 4.25 Gb1F58 10 Gb1F59 10 Gb
No obvious lossAfter ~700 hr 85/85
Bad electric contactBoards were poorly prepared, ch8 light recovered
1F45
1F45
1F58
1F59
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FINISAR array degradationOnly 1 of 8, showing large degradation, the rest are consistent with small degradation, in 1100 hrs @ 85/85