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

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 2

§ System Requirements § Conceptual Design § Scope/Deliverables § Resource OpKmizaKon § OrganizaKon § Plan for CD-2/Preliminary Design § Cost § Schedule § Risk § ESH&Q § Breakout Session topics § Summary

Outline

In this talk I am describing US contribuKons to the MTD as a planning package. Hence the MTD porKon of the project is presented at a different level of maturity relaKve to the

• ther subprojects.

The specificity of the contents of this plan (WBS, deliverables, BoEs, KPPs) will increase as the project evolves.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 3

§ 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

Biographical Sketch

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 4

CMS HL-LHC Upgrade Overview

New Tracker

• Rad. tolerant - increased granularity - lighter
• 40 MHz selecKve readout (strips) for Trigger
• Extended coverage to η ≃ 3.8

Trigger/HLT/DAQ

• Track informaKon in trigger at 40 MHz
• 12.5 µs latency
• HLT input/output 750/7.5 kHz

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

Kming capability

Barrel Calorimeter

• New FE/BE electronics for full granularity

readout at 40 MHz - with improved Kme resoluKon

• Lower ECAL operaKng temperature (8∘C)

Beam radiaKon and luminosity Common systems and infrastructure MIP Timing Detector

• Barrel layer: Crystal + SiPM
• Endcap layer: Silicon Low Gain Avalanche Detectors

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 5

The Challenge of the HL-LHC era

One 25ns bunch crossing

Every object suffers

Era Peak Linst [cm-2s-1 ] Peak PU

LHC 1.5E34 50 HL-LHC: baseline 5.0E34 140 HL-LHC: ulKmate 7.5E34 200

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: 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

A New PerspecCve

nominal σz = 4.5cm nominal σt = 180ps

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 8

§ 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

• f 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 § Allows one to befer disambiguate p-p

interacKon-of-origin at 200PU

Effect of Precision Timing

The incidence of PU tracks being associated to the hard interacKon vertex is reduced by a factor of 5 – returning to the level of the LHC era!

mean density, 200 PU running mean density, 50 PU running

See more in Lindsey Gray’s talk in the apernoon MTD Breakout Session.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 9

Conceptual Design

Charge #2

• Timing resoluKon of 30ps
• RadiaKon tolerance to 4/ab
• Cost effecKve design over large area
• Manageable data volume and power

Design constraints:

• Marginal impact on rest of CMS
• IntegraKon fits within schedule

“BTL” “ETL”

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 10

Conceptual Design: BTL Sensors

§ 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 § best σt among rad hard opKons

§ SiPM: Silicon photomulKplier

§ small acKve area à low noise § small cell pitch à opKmized choice

for PDE, gain, radiaKon tolerance

§ distributed acKve area à reducKon

in impact posiKon dependence

Post-exposure performance Performance goal aLer 2E14 neq/cm2 Performance goal beginning of run

More details in Marco Luchinni’s talk in the apernoon Breakout Session

Charge #2

SiPM

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 11

Conceptual Design: BTL Modules

Charge #2

§ 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

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 à 248,832 total channels

§ Modules are the “quantum” of the BTL assembly project

Each module is 185 mm x 47 mm x 24 mm Each half-tray has a mass of 12 kg

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

Conceptual Design: BTL Electronics

Charge #2

More details in Adi Bornheim’s talk in the apernoon Breakout Session TOFHIR Board:

Contains 6 TOFHIR chips 96 channels

Concentrator Card

lpGBT, LV, FEASTMP DC-DC conv

384 channels

§ SiPMs mounted to a simple board § Signals routed to TOFHIR 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)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 13

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

§ σt=30ps up to 1E15 neq/cm2 (max for 90% of ETL) § σt=40ps up to 2E15 neq/cm2 (max for all ETL)

§ Advanced technology § MulKple vendors

Charge #2

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 14

§ AccounKng:

§ Two layers per disk § Two disks on each endcap § 8 wedges per disk § 2624 system modules § ~2M total channels

Conceptual Design: ETL Modules

Charge #2

More details in Slavek Tkaczyk’s talk in today’s Breakout Session

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 15

§ ETL FE ASIC

§ Measurement of ToA with LGAD at ~30ps precision § One chip is a matrix of ~100 LGAD pixels § Challenges from distribuKon of Kming references, control of the drip of parameters

due to radiaKon damage

§ Chip development lead by FNAL

§ TSMC 65nm: experience, libraries, rad. dam. models from RD53 & lpGBT § Ongoing design study of the preamp and CFD implementaKon § Exploring the possibility of common developments with ATLAS

§ First mini-workshop in June 13 at FNAL

§ Open meeKng and all are welcome § ParKcipaKon from several insKtuKons from US and abroad

Conceptual Design: ETL Electronics

More details in Artur Apresyan’s talk in tomorrow’s Breakout Session

Charge #2

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 16

Outcome of LHCC Review

§ MTD Technical Proposal submifed to the LHCC in late November 2017

§ Seeking step 1 approval from LHCC to include MTD in Phase-2 CMS scope and proceed to

preparaKon of TDR

§ Response from commifee: received 1 March 2018

§ “The Kming layer design proposed by CMS is reasonable and is expected to fulfill specificaKons of

the HL-LHC running”

§ “There is experienced and enthusiasKc team of experts interested in developing and then

construcKng and operaKng CMS Kming layer”

§ “Based on the above we recommend CMS to proceed to develop Xming layer TDR with

submission in late 2018.”

§ RecommendaKons (abridged):

§ Extensive and large number of radiaKon hardness tests have to be performed on final elements of

the system, including sensors, electronics, power elements

§ Develop design in close cooperaKon with tracker and endcap calorimeter upgrade groups § Define specs for front-end ASICs and verify ASICs performance § Verify Kming signal stability in detecKon electronics of ~10 ps § Develop a full simulaKon of MTD, verify expected performance, further develop physics case of

forward layer

§ Endorsed by CERN Research Board 7 March 2018

Birth of the project just two months ago. Charge #8

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 17

§ The MTD has broad internaXonal parXcipaXon

§ 33 insKtutes from 11 countries § Interest from potenKal new partners as well since the Step 1 approval

from the LHCC and CERN RB

§ Currently, int’l MTD is organizing as a fully-fledged project inside CMS

§ InsKtuKon Board, with Chair § ConsKtuKon § Establishment of a System Manager § FormaKon of a Finance Board and Resource Manager

§ Total core cost of the enKre MTD is 15.7 MCHF

§ Outlook:

§ Overall internaKonal funding for MTD will be handled through the MTD

Finance Board

§ Major internaKonal partners have pledged resources, broad commitment to

funding this project to successful implementaKon

§ Money matrix is dynamic and discussions are ongoing

MTD: InternaConal Project, Costs

Belarus Finland France Germany Italy Lithuania Portugal Russia Spain Switzerland US

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 18

MTD: US Leadership Roles

Several US personnel holding key leaderships posiKons in the internaKonal MTD project

MTD organization

Chris Tully

Ted Liu (ETL)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 19

US InsCtuConal ParCcipaCon

InsXtute Interests (Coarse) UCSB ETL sensor & module R&D and construcCon Caltech BTL sensor & module R&D and construcCon, ETL sensor R&D Fairfield BTL sensor R&D FNAL ETL sensor & module R&D, FE ASIC, construcCon Iowa BTL sensor R&D Kansas ETL sensor R&D Kansas State BTL readout electronics Notre Dame BTL sensor & SiPM R&D, backend electronics Princeton BTL sensor & module R&D, BTL mechanics Virginia BTL sensor & module R&D and construcCon

A few other partners interested in contribuKng to ETL sensor QA, trigger, backend (Brown, MIT, Northeastern, UIC, Wisconsin). Strong, well-qualified community of US experts commifed to making this new detector work.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 20

Work Breakdown Structure

§ Natural separaKon of acKviKes, BTL and ETL

§ different technical req’s due to different radiaKon environments § decoupled Kmelines

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 21

§ BTL: Six main areas of contribuKon

§ Tracker Support Tube

§ Mechanical engineering, liaison with Tracker

engineering

§ Sensors

§ Includes both scinKllator and SiPMs

§ Electronics

§ Concentrator Card

§ Modules

§ Assembly and tesKng of BTL modules, which

will contain sensors, SiPMs and Concentrator Cards

§ Backend Electronics

§ Provision of off-detector electronics,

capitalizing on engineering and R&D executed in other upgrade subsystems

§ InstallaKon and Commissioning

§ Desire to parKcipate in the I&C of the device

• nce it is delivered to CERN

Work Breakdown Structure

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 22

§ ETL: Five main areas of contribuKon

§ Electronics

§ Design of the FE readout ASIC

§ Sensors

§ Development of LGAD sensors

§ Modules

§ Assembly and tesKng of ETL modules,

which will contain LGAD sensors, Read- Out Chips (ROCs), readout aggregator

§ Backend Electronics

§ Provision of off-detector electronics,

capitalizing on engineering and R&D executed in other upgrade subsystems

§ InstallaKon and Commissioning

§ Desire to parKcipate in the I&C of the

device once it is delivered to CERN

Work Breakdown Structure

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 23

US-MTD Funding and Scope

§ Funding envelope: Funds cover M&S and labor in the R&D and construcKon eras, as well as some set-aside for I&C

§ Current rollup in P6: $9.9M + $4.8M conKngency (50%) ≈ $14.7M

§ The expectaKon is that we will “build to cost” – meaning we will contribute what we can within our funding envelope § The US will contribute to both the BTL and ETL porKons of the project, matching exisKng R&D efforts and experKse

§ Sensor R&D, specificaKon and eventual producKon QA tesKng for both the

scinKllators+SiPMs of the BTL and LGADs of the ETL

§ Module assembly and checkout/QA tesKng before shipment to CERN for

integraKon with CMS

§ Readout electronics, both for the Concentrator Card of the BTL and the FE ASIC for

the ETL

§ Backend readout electronics for both the BTL and ETL § Mechanical engineering of the support structures for both BTL and ETL

§ The extent amount that the US will provide in the construcKon era of the project is conKngent on the definiKon of the internaXonal project’s funding profile and assembly model, a process that is underway.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 24

24

Threshold and ObjecCve KPPs

CMS-doc-13237

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 25

Next Steps toward CD-2

§ The path forward in terms of next steps in the R&D plan is well-defined:

§ Finalize BTL mounKng strategy in TST, thermal and stress/strain

analysis

§ Sensor opKmizaKon and specificaKon studies for both

scinKllator+SiPM packages and LGADs

§ Design of the ETL FE ASIC § Prototyping realisKc readout electronics

§ Move on to “slice tests” examining performance of full-size modules in testbeams, integrated with authenKc readout electronics, passive material for module support and cooling, by CD-2 § In parallel determine and validate the module assembly and checkout procedures § Important: this planning package will mature, gaining more specificity in the resource loaded schedule

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 26

Float Float

Schedule

FY26 FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18 FY17

CD4 CD1 LS 2

LHC

TS Physics Physics Physics TS Physics TS Physics LS 3

Sensors Electronics Modules Mech Integrat’n

Performance ValidaKon Pre-prototype Prototype

ProducKon

Performance ValidaKon

ProducKon

Procedure DefiniKons Assembly

BTL: sensors, SiPMs ETL: LGAD BTL: Concentrator Cards BTL: Assembly sites

Engineering TesKng

BTL: TST

Analog Prototype

ROC prototype

Pre-producKon

ETL: FE ASIC ETL: Assembly sites

Procedure DefiniKons

Assembly and QC

IntegraKon

BTL: IntegraXon into TST

IntegraKon

ETL: IntegraXon on endcap

Mixed Prototype Digital Prototype

ETL: Flex board

Prototype

ETL: Aggregator

Prototype

ETL: ASIC ROC+flex+aggregator

ProducKon Outer Tracker assembly start

ProducKon

Finalize Design

HGCal installed ETL integraXon ready Lowering

MTD TDR MTD EDR

BTL Module assembly complete need-by BTL complete need-by

MTD

CD2

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 27

Cost Summary

§ We have developed a plan that accomplishes a significant amount of deliverables to the MTD project building on the exisKng strengths of the US insKtutes involved § The contribuKons fit into two eras (R&D and ConstrucKon), which match the

• verall Kmeline for the internaKonal MTD project

§ Costs are based off esKmates for M&S from previous experience on CMS, and expectaKons for labor from similar projects within CMS and elsewhere § Costs generated from resource loaded schedule, and EsKmate Uncertainty follows project guidelines

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 28

Cost Summary

CMS-doc-13481

MTD is 8.9% of the total USCMS HL-LHC project. Hence, not a cost driver – and, although new to the US scope, poses small impact on overall risk to cost and schedule.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 29

Project Cost Drivers: Top 20 (> $2M)

PM = Project Management OT = Outer Tracker CE = Calorimeter Endcap TD = Trigger and DAQ TL = Timing Layer

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 30

MTD Costs at Level 3 / 4 CMS-doc-13215

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 31

MTD Cost Drivers

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 32

Cost Profile

§ Cost profile is consistent with achieving necessary need-by dates:

§ BTL: OT construcKon start date in Q2 2023 § ETL: Endcap lowering in Q2 2025 § CD-4: Q3 2026 § Overall CMS: Q2 2027

§ BTL more forward in Kme than ETL, given slightly advanced OT v. CE schedule (integraKon constraints)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 33

§ Contributed labor here represents pledged available labor from insKtutes § Needs to be scrubbed from bofom up – what is needed to provide the deliverables? § In this regard, the pledged amount is an upper limit, and this aspect is included in the project’s risk analysis – but will be reduced once the numbers are more appropriate

Labor

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 34

Contributed Labor

Again, take these with a grain of salt – pledges rather than statement on required contributed labor.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 35

Costed Labor

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 36

EsCmate Maturity

(as a fracXon

• f base cost)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 37

CriCcal Path: BTL

§ Current BTL schedule has a hard deadline of Q2 CY2023

§ Marks beginning of OT assembly project inside TST § Need to have complete inserKon of all BTL trays into TST before

this date

§ Target complete date end Q2 2022 = 9 months of float § But the schedule leading up is well-packed:

§ CC engineering and prototyping in FY 2018,19 allowing for

producKon quanKty evaluaKon in FY 2020

§ Sensor and SiPM R&D in FY 2018,19 allowing for producKon

quanKty evaluaKon in FY 2020

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 38

CriCcal Path: ETL

§ CriKcal path for ETL is electronics

§ Long lead Kmes for FE ASIC development § MulKple pieces need to come together in parallel (FE ASIC, flex,

aggregator)

§ There are opKons in the schedule of the final mounKng of ETL, providing addiKonal float

§ Surface integraKon: would take place in FY 2023-24 (baseline plan,

reflected in schedule presented a few slides back)

§ Cavern integraKon: would take place in FY 2025

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 39

Risk Management

§ We have not yet completed a formal / complete analysis of risks to cost and schedule due to the relaKve maturity stage

• f the project

§ A risk analysis similar to other subsystems will be underway in Kme

for the CD-1 review

§ We have started however to consider and enumerate our sources of C&S risk § Examples:

§ The possibility of an addiKonal engineering prototype run for the

ETL FE ASIC

§ Delay of components outside the US scope (eg., TOFHIR chips /

board, lpGBTs, FEASTs, etc)

§ ConstrucKon center mulKplicity in case of catastrophic event § ReducKon in availability of contributed labor (project-wide) § Foreign currency valuaKon changes (project-wide)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 40

QA/QC and ESH&Q

§ In everything we do, safety is the highest priority § A formal assessment of ESH&Q issues associated with the MTD project is underway, examining materials, apparatus and procedures associated with the ongoing construcKon era

§ Few sources of unique hazards associated with the MTD, given the

previous experience on CMS with similar devices and QA procedures

§ We will work though}ully on a Quality Assurance plan that keeps these issues at a high priority § We pledge to work with the project’s ESH&Q coordinator to ensure that all requirements are met

§ This is reflected in our Quality Assurance plan

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 41

Breakout Sessions

§ This apernoon: Technical consideraKons

§ Outlook from Interna6onal MTD Project - Chris Tully, Princeton § Impact on CMS Physics Program – Lindsey Gray, FNAL § BTL Baseline Design: Sensors and SiPMs – Marco Luchinni, Princeton § BTL Baseline Design: Electronics and mechanics – Adi Bornheim, Caltech

• - coffee break --

§ ETL Baseline Design: Sensors – Chris Rogan, U. of Kansas § ETL Baseline Design: Integra6on and mechanics – Slavek Tkaczyk, FNAL

§ Tomorrow: Cost and schedule

§ BTL C&S – CCN § ETL C&S - Artur Apresyan, FNAL

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 42

Summary

§ The MTD will play a crucial role in establishing opKmal performance of CMS in high PU running condiKons in the HL-LHC era § The conceptual design has been approved by the LHCC and CERN Research Board to go ahead with the preparaKon of a TDR and to be included officially in the Phase 2 scope of CMS § US insKtuKons are playing a major role in the project, and will make significant contribuKons in conKnuing R&D programs and the ulKmate construcKon project § Cost and schedule esKmates are currently at the planning package stage. More specificity will be added in the coming weeks and months and parKcular items come into greater focus § We have iniKated the planning into the same framework as all other projects, so that we are taking advantage of best pracKces when it comes to esKmaKng cost, labor requirements, schedule, etc. § There is much work to do but the US insKtutes involved have the intellectual resources available to make this project a success for CMS and the LHC

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 43

Backup

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 44

§ Granularity choice is a trade-

• ff:

§ small sensors are less

suscepKble to Kme spread, leakage current, etc

§ small sensors inflate the total

channel count, increasing the data volume

§ Reasonable occupancy: 2-5%

§ operaKng point that avoids

significant impact double hits

§ Reasonable data volume:

§ ~4TB/s when read out upon

trigger w/ zero-suppression scheme

Conceptual Design: Granularity

§ ResulKng channel area:

§ BTL: 11 x 11 mm2 § ETL: 1 x 3 mm2 (x3 ganging for |η|<2.1)

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 45

§ Example: PU tracks intrude on the isolaKon cone for charged leptons from Z decay § Accurate removal of these has a significant posiKve impact on, for instance, HàZZà4leptons

Impact of Precision Timing

§ Precision Kming provided by the MTD benefits every

• bject at CMS:

§ PVs § Isolated leptons § Jets § MET § HF tagging § Di-photon vertex § ...

§ Broad impact on physics analyses § Highlight a few examples here

Example plots here are for muons. Similar story for hadronic taus.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 46

§ Jets from pileup interacKons are significantly reduced with the MTD (red points) § Effect is parKcularly impac}ul in forward regions where we idenKfy jets indicaKve of VBF processes = crucial aspect of HL-LHC physics program

Impact of Precision Timing

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 47

§ Significant gains in b-tag efficiency at a given false-posiKve probability § Has significant impact on HL-LHC physics physics program

§ Eg., Higgs self coupling from

di-Higgs producKon in bbγγ, 4b signatures

§ ~20% effecXve Lint increase

Impact of Precision Timing

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 48

Impact on Physics Program

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 49

§ The MTD provides more to CMS beyond pileup miKgaKon § Most crucial: SensiKvity to long-lived parKcles (LLPs)

§ TheoreKcally well moKvated § MTD allows for measurement of Kme-of-flight

from producKon to decay vertex of LLP

§ Use visible porKon of LLP decay products along

with LLP velocity à energy in LLP rest frame à reconstruct LLP mass

§ Profound new capability inaccessible without

the MTD

§ Other developing applicaKons as well

§ Temporal structure of jets § ParKcle ID inside jets § HolisKc event-level tagging § ....

§ Timing provides more informaKon – and more informaKon is always good § PotenXal to have a legacy impact on the LHC physics program

MTD as Window to New Physics: LLPs

(LLP)

Can be parKally invisible decay system. MTD provides Kme for LLP producKon and decay verKces

No peaking variable without the MTD.

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 50

Relevant fluence values

Chris Neu MIP Timing Detector USCMS HL-LHC CD-1 Review 5 June 2018 51

Interfaces

§ Key interfaces have been idenKfied:

§ Mechanical dimension of BTL support inside TST, thermal and

mechanical impact on TST and tracker

§ Mechanical implicaKon on HGCal for installaKon requirements § Cooling: pressure, arrangement of lines, connectors § ETL services impact on HGCal acKve area § Material budget impact on expected ECAL performance § Electrical: low-voltage and high-voltage supplies § Electronic/opKcal: connecKon to backend and trigger, clock

§ We do not yet have an Interface Control Document, but one will be developed on the Kmescale of CD-1 § Interface management is a shared responsibility among team members who have roles in both US-MTD and the internaKonal MTD project. Titles evolving.

§ L. Gray (interim project manager), C. Tully (IB chair), A. Bornheim

(BTL), M. Lucchini (BTL), A. Apresyan (ETL), T. Liu (ETL), C. Neu (s&p)