ATLAS NSW Trigger Alex Tuna Harvard University DPF @ Fermilab 31 - PowerPoint PPT Presentation

ATLAS NSW Trigger Alex Tuna Harvard University DPF @ Fermilab 31 July 2017 1

related talks this week Yu: ATLAS MDTs for HL-LHC Monday afternoon Catrin: ATLAS trigger algs in Run 2 Monday afternoon Heather: ATLAS trigger menu in Run 2 Monday afternoon Tom: ATLAS Muon for HL-LHC Wednesday afternoon Xiangting: ATLAS tRPCs for Run 3+ Thursday morning Liang: ATLAS NSW Electronics Thursday morning Jared: CMS GEM for Run 3+ Thursday afternoon 2 Alexander Tuna

introduction 3 Alexander Tuna

Salève Salève a a v v n n e e e e G G e e a a k k L L LHCb LHCb ATLAS ATLAS ALICE ALICE CMS CMS LHC LHC 4 Alexander Tuna

a 20-year plan for the LHC instantaneous luminosity increasing — experiments must adapt! ATLAS has suite of upgrades for near-term (Phase 1) and long-term (Phase 2) 5 Alexander Tuna

the new Small Wheel (NSW) NSW replaces current SW — small Thin Gap Chambers (sTGC) under construction now comprised of eight layers each of two new detectors for ATLAS Micromegas (MM) 3/45+, "&+2)'% 1%02 !4--&/0 $%&'()*+, !"# %-%.+/)'%0 !676,899: 6 Alexander Tuna

the new Small Wheel (NSW) o ff ers two major improvements to ATLAS muon spectrometry rate capacity ������ detector elements much smaller in NSW than current SW latest HL-LHC e.g. MM strip pitch ≈ 0.5 mm estimate: 7.5x10 34 whereas CSC strip pitch ≈ 5 mm smaller flux per element @ NSW 7 Alexander Tuna

the new Small Wheel (NSW) o ff ers two major improvements to ATLAS muon spectrometry trigger ATLAS Run 201289 [LB 96-566], LHC Fill 2516, Apr. 15 2012, 50ns spacing NSW adds layer of coincidence for Number of RoI ATLAS Preliminary 300 hardware trigger decision L1_MU11 RoI 250 RoI matched to reconstructed muon RoI matched to p >10GeV reco. muon T 200 powerful reduction of triggers not originating from muons 150 100 50 emphasis of this talk 0 -2 -1 0 1 2 RoI η 8 Alexander Tuna

the new Small Wheel (NSW) o ff ers two major improvements to ATLAS muon spectrometry trigger NSW adds layer of coincidence for Big Wheel EM hardware trigger decision powerful reduction of triggers not EI C New Small Wheel originating from muons A ∆θ B end-cap emphasis of this talk toroid LL_SV_NSW IP Z 9 Alexander Tuna

sTGC & MM triggers 10 Alexander Tuna

sTGC trigger electronics NSW Electronics Trigger & DAQ dataflow near-detector on-detector FEB sTGC o ff -detector pad Pad “L1DDC” TDS trigger USA15 twin-ax 1/FEB 2xGBT strip strip Trigger strip TDS Router TDS processor TDS fibre twin-ax 3/FEB fibres candidate on NSW rim fibre sTGC merging Trigger MM “ADDC” processor American institutes building many pieces! ART GBT MM fibre twin-ax ART TTC GBT VMM BNL for FE chip: VMM SCA FELIX FELIX # VMMs per FEB: on-chamber MM: 8 Michigan for drivers: TDS and Router Readout n sTGC strips: 6 or 7 ASIC e sTGC pad+wire: 2+1 t fibre Illinois for trigger functions: Trigger anc. GBT w Config Config ratjon 11 Alexander Tuna on twin-ax LV power

sTGC trigger electronics ● ask for many-layer coincidence with coarse pad triggers ● readout strips within pad trigger tower 3 out of 4 && pping pads. 3 out of 4 active pad-tower covers active strip band φ ID large data reduction with pad “pre-triggering” 12 Alexander Tuna �

sTGC trigger electronics 120b/116b encoding × 2 quadruplets per packet, y Event 1906 4 one packet per BC ly Gb/s pad trigger TDS ASIC e Q from Time−Over−Threshold 50 layer 4 x 9 data x d- 8.28 0 f er 50 layer 3 ts 10.08 0 s- es 50 layer 2 12.00 n- 0 d n 50 layer 1 14.00 ia � 0 e −2 0 2 4 6 8 10 12 14 16 18 strip # n — 8 centroids of strips i- φ coordinate — 2 centroids of centroids measured by pad — LUT for “track” 13 Alexander Tuna • • • •

NSW Electronics Trigger & DAQ dataflow twin-ax 2xGBT MM trigger electronics fibre twin-ax fibres fibre Trigger MM “ADDC” processor ART GBT MM fibre twin-ax ART TTC GBT VMM SCA FELIX FELIX # VMMs per FEB: on-chamber MM: 8 Readout n sTGC strips: 6 or 7 ASIC e sTGC pad+wire: 2+1 t fibre GBT w American institutes building many pieces! Config Config ratjon BNL for FE chip: VMM on twin-ax LV power Arizona for FE card: MMFE8 BNL for driver card: ADDC Harvard for trigger card: MM TP Illinois for trigger functions: Trigger anc. 14 Alexander Tuna

MM trigger electronics ~20x less data ● only readout first strip per VMM than full readout ● “ART”: Address in Real Time ● 64 strips per VMM covers ~2.5 cm stereo stereo horizontal MM z “X” “U” “V” z drift (5mm) z half t i , x i (2.5 mm) x x half φ information inferred from stereo planes with θ strip = 1.5° 15 Alexander Tuna

MM trigger electronics R ✓ 4 m all ART strips received at ● 𝙔 ● MM TP , then filtered by 𝙔 ● ● roads in FPGA ● 𝙔 ● 𝙔 ● 𝙔 𝙔 large data reduction with ● ● ● road filtering: ● ● ● ~500 roads per chamber ● ● ● 1 m filtered strips then “fit” z for track parameters IP 7.6 m 7.8 m 16 Alexander Tuna

MM trigger electronics R ✓ 4 m all ART strips received at ● MM TP , then filtered by ● roads in FPGA ● ● large data reduction with ● road filtering: ● ~500 roads per chamber ● ● 1 m filtered strips then “fit” z for track parameters IP 7.6 m 7.8 m 17 Alexander Tuna

MM trigger electronics R 4 m all ART strips received at ● MM TP , then filtered by ● roads in FPGA ● ● large data reduction with ● road filtering: ● ~500 roads per chamber ● ● 1 m filtered strips then “fit” z for track parameters IP 7.6 m 7.8 m 18 Alexander Tuna

performance 19 Alexander Tuna

simulated performance simple OR of sTGC and MM decisions 0.1 NSW Entries excellent matching ATLAS Simulation Preliminary 70 0.08 η resolution between - Phase I upgrade study 0.06 BW 60 muon p = 40 GeV NSW and existing BW η T 0.04 50 0.02 40 0 NSW-BW coincidence 0.02 − 30 e ffi ciency expected to be 0.04 − 20 90-95% or better for 0.06 − 10 flagship L1 p T ( μ ) > 20 GeV RoI RoI 0.08 = -1.39, = -0.25 η φ − 0.1 0 − 0.1 0.05 0 0.05 0.1 − − - φ φ BW NSW 20 Alexander Tuna

simulated performance Muon level-1 trigger rate [Hz] simple OR of sTGC and MM decisions 6 10 10 Muon level-1 trigger rate [Hz] η 34 η 5 -2 -1 Extrapolation to 14 TeV, L=10 34 cm -2 s -1 s = 14 TeV L=10 cm s 10 10 muon trigger rates η | |<1.05 η dominated by fakes Extrapolation Extrapolation with NSW in the endcaps w i t h o u η t N S η W 10 η η 4 4 10 10 with NSW substantial rate barrel reduction (~3x) 10 predicted with NSW 3 3 10 10 ATLAS Preliminary 5 5 10 15 20 25 30 35 40 45 p threshold [GeV] T 21 Alexander Tuna