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