P06 L2 Overview: 402.8 MIP Timing Detector Chris Neu USCMS HL-LHC - PowerPoint PPT Presentation

P06 – L2 Overview: 402.8 MIP Timing Detector Chris Neu USCMS HL-LHC CD-1 Independent Project Review 5 June 2018

Outline § System Requirements § Conceptual Design In this talk I am describing US § Scope/Deliverables contribuKons to the MTD as a § Resource OpKmizaKon planning package. § OrganizaKon Hence the MTD porKon of the project is presented at a different § Plan for CD-2/Preliminary Design level of maturity relaKve to the § Cost other subprojects. § Schedule The specificity of the contents of this plan (WBS, deliverables, § Risk BoEs, KPPs) will increase as the § ESH&Q project evolves. § Breakout Session topics § Summary Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 2

Biographical Sketch § Chris Neu § Associate Professor, University of Virginia (2008-present) § InsKtuKonal experKse on crystal scinKllators for calorimetry, radiaKon tolerant photodetectors § Co-convener of the MTD SimulaKon and Performance group § Member of the MTD Steering Group § Serving as interim L2 for US MTD since January § Formerly a member of CDF as a graduate student (OSU, 98-03) working on the XFT track trigger, and as a postdoc (Penn, 03-08) working on the L2 trigger upgrade for Run IIb § Physics interests: top-Higgs coupling, top quark measurements, dark mafer Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 3

CMS HL-LHC Upgrade Overview Barrel Calorimeter Trigger/HLT/DAQ • New FE/BE electronics for full granularity • Track informaKon in trigger at 40 MHz readout at 40 MHz - with improved Kme • 12.5 µs latency resoluKon • HLT input/output 750/7.5 kHz • Lower ECAL operaKng temperature (8 ∘ C) Muon systems • New DT & CSC FE/BE electronics • New staKon to complete CSC at 1.6 < η < 2.4 • Extended coverage to η ≃ 3 New Endcap Calorimeters • Rad. tolerant - High granularity transverse and longitudinal • 4D shower measurement including precise Beam radiaKon and luminosity Kming capability Common systems and infrastructure New Tracker MIP Timing Detector • Rad. tolerant - increased granularity - lighter • Barrel layer: Crystal + SiPM • 40 MHz selecKve readout (strips) for Trigger • Endcap layer: Silicon Low Gain Avalanche Detectors • Extended coverage to η ≃ 3.8 Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 4

The Challenge of the HL-LHC era Era Peak L inst [cm -2 s -1 ] Peak PU One 25ns bunch crossing LHC 1.5E34 50 HL-LHC: baseline 5.0E34 140 HL-LHC: ulKmate 7.5E34 200 Every object suffers Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 5

A New PerspecCve Although interac6ons significantly overlap in space, they are more separable in space + /me: Imagine slicing the beam spot into consecu6ve exposures in 6me – the number of ver/ces per exposure is far smaller than when integra6ng over an event’s complete 6me profile. Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 6

A New PerspecCve Although interac6ons significantly overlap in space, they are more separable in space + /me: nominal σ t = 180ps nominal σ z = 4.5cm Imagine slicing the beam spot into consecu6ve exposures in 6me – the number of ver/ces per exposure is far smaller than when integra6ng over an event’s complete 6me profile. Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 7

Effect of Precision Timing § PU tracks come from minimum ionizing parKcles (MIPs) § State of the art Kming devices are capable of measuring Kme-of-arrival for MIPs with a resoluKon of 30ps or befer § What effect would a MIP Kming measurement with a Kme resoluKon mean density, 50 PU running mean density, 200 PU running of 30ps have? § Consider: § Thin layer just inside calorimetry § DeposiKons have Kmestamp with 30ps resoluKon within 25ns bunch crossing § Link calo deposiKons with tracks § Primary vertex ID goes from 3D à 4D fit The incidence of PU tracks being § Allows one to befer disambiguate p-p associated to the hard interacKon interacKon-of-origin at 200PU vertex is reduced by a factor of 5 – See more in Lindsey Gray’s talk in the returning to the level of the LHC era! apernoon MTD Breakout Session. Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 8

Charge #2 Conceptual Design “BTL” “ETL” Design - Timing resoluKon of 30ps - Cost effecKve design over large area - Marginal impact on rest of CMS constraints: - IntegraKon fits within schedule - Manageable data volume and power - RadiaKon tolerance to 4/ab Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 9

Charge #2 Conceptual Design: BTL Sensors SiPM Performance goal beginning of run § LYSO:Ce Kle glued to a Silicon PhotomulKplier (SiPM) § LYSO:Ce: Cerium-doped luteKum-yfrium oxyorthosilicate § inorganic scinKllaKng compound § fast and bright § radiaKon hard § mass produced, mulKple vendors Post-exposure performance § best σ t among rad hard opKons § SiPM: Silicon photomulKplier § small acKve area à low noise Performance goal aLer § small cell pitch à opKmized choice 2E14 neq/cm 2 for PDE, gain, radiaKon tolerance § distributed acKve area à reducKon in impact posiKon dependence More details in Marco Luchinni’s talk in the apernoon Breakout Session Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 10

Charge #2 Conceptual Design: BTL Modules § BTL will reside in the Tracker Support Tube (TST) § Very compact real estate market in this region § Must accommodate acKve and passive elements, cooling tray § AccounKng: § 36 segments in φ, 2 in η Each half-tray has a mass of 12 kg à 72 “half-trays” each 2.5m § Each half-tray has 54 “modules” à 3888 total system modules (plus spares, teststands, burn) § Each module has 64 sensor+SiPM channels Each module is à 248,832 total channels 185 mm x 47 mm x 24 mm § Modules are the “quantum” of the BTL assembly project More details in Adi Bornheim’s talk in the apernoon Breakout Session Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 11

Charge #2 Conceptual Design: BTL Electronics Concentrator § SiPMs mounted to a simple Card board lpGBT, LV, FEASTMP TOFHIR Board: DC-DC conv Contains 6 TOFHIR 96 channels 384 channels § Signals routed to TOFHIR chips chips, 6 to a board § Four TOFHIR boards feed channel inputs to the Concentrator Card (CC) § CC also supplies power to SiPM board, TOFHIR chips, etc. § For ~249k channels, this implies 716 CC’s are needed for the BTL system (plus spares, teststands, burn) More details in Adi Bornheim’s talk in the apernoon Breakout Session Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 12

Charge #2 Conceptual Design: ETL Sensors § Silicon low-gain avalanche detector (LGAD) § Ultra-fast device, opKmized for Kming § Low gain achieved through moderately doped p-implant § Low gain à shot noise is small, below the electronic noise § RadiaKon tolerant § σ t =30ps up to 1E15 neq/cm 2 (max for 90% of ETL) § σ t =40ps up to 2E15 neq/cm 2 (max for all ETL) § Advanced technology § MulKple vendors More details in Chris Rogan’s talk in today’s Breakout Session Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 13

Charge #2 Conceptual Design: ETL Modules § AccounKng: § Two layers per disk § Two disks on each endcap § 8 wedges per disk § 2624 system modules More details in Slavek Tkaczyk’s talk in § ~2M total channels today’s Breakout Session Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 14