The CMS Upgrade Program ECFA High Luminosity LHC Experiments Workshop Aix-les-Bains, October 1, 2013 J. Spalding, on behalf of the CMS Collaboration 1.

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Presentation transcript:

The CMS Upgrade Program ECFA High Luminosity LHC Experiments Workshop Aix-les-Bains, October 1, 2013 J. Spalding, on behalf of the CMS Collaboration 1 An outline of the upgrade program More detail will be included in the talks at this workshop

 =1.5  =3 Pixel Detector ECAL: EB HCAL: HB Silicon Tracker HCAL: HO HE EE HF Solenoid Muon Barrel: DT, RPC Muon Endcap: CSC, RPC Tracking More than 220m 2 surface and 76M channels (pixels & strips) 6m long, ~2.2m diameter Tracking to |  |<2.4 ECAL Lead Tungstate (PbWO 4 ) EB: 61K crystals, EE: 15K crystals HCAL HB and HE: Brass/Plastic scintillator Sampling calorimeter. Tiles and WLS fiber HF: Steel/Quartz fiber Cerenkov calo. HO: Plastic scintillator “tail catcher” Muon System Muon tracking in the return field Barrel: Drift Tube & Resistive Plate Chambers Endcap: Cathode Strip Chambers & RPCs Trigger Level 1 in hardware, 3.2µs latency,100 kHz ECAL+HCAL+Muon HLT Processor Farm,1 kHz: Tracking, Full reco  =1.0 CMS design for 10 yrs operation at 1x10 34 cm -2 s -1

3 CMS

4

LHC to HL-LHC - The Challenge  Experiment must maintain full sensitivity for discovery and precision measurements at low p T, under severe conditions o Pileup - will approach 50 events per crossing by LS2 - ≈ 60 by LS3 -and up to 140 (accounting for uncertainty and bunch-to-bunch variations) for lumi-leveling at 5x10 34 cm -2 s -1 at HL-LHC o Radiation damage -Light loss (calorimeters), increased leakage current (silicon detectors) -Requires work to maintain calibration -And eventually limits the performance-lifetime of the detectors 5 PU 50 !!! Observed signal loss in HF quartz fibers, Laser data vs Radiation dose This will be a very typical event The accelerator upgrades will enable an extensive and rich physics program

CMS Upgrade program 6 LS LS LS LS LS LS LS1 consolidation: Complete detector & consolidate operation for nominal LHC beam conditions ∼ 13 TeV, 1 x Hz/cm 2, ∼ 25 Complete Muon system (4 th endcap station), improve RO of CSC ME1/1 & DTs Replace HCAL HF and HO photo-detectors and HF backend electronics Tracker operation at -20 ∘ C Prepare and install slices of Phase 1 upgrades LS1 consolidation: Complete detector & consolidate operation for nominal LHC beam conditions ∼ 13 TeV, 1 x Hz/cm 2, ∼ 25 Complete Muon system (4 th endcap station), improve RO of CSC ME1/1 & DTs Replace HCAL HF and HO photo-detectors and HF backend electronics Tracker operation at -20 ∘ C Prepare and install slices of Phase 1 upgrades Phase 1 upgrades: Prepare detector for 1.6 x Hz/cm 2, ∼ 40, and up to 200 fb -1 by LS2, and 2.5 x Hz/cm 2, ∼ 60, up to 500 fb -1 by LS3 New L1-trigger systems (Calorimeter - Muons - Global) (ready for 2016 data taking) New Pixel detector (ready for installation in 2016/17 Year End Technical Stop) HCAL upgrade: photodetectors and electronics (HF 2015/16 YETS, HB/HE LS2) Phase 1 upgrades: Prepare detector for 1.6 x Hz/cm 2, ∼ 40, and up to 200 fb -1 by LS2, and 2.5 x Hz/cm 2, ∼ 60, up to 500 fb -1 by LS3 New L1-trigger systems (Calorimeter - Muons - Global) (ready for 2016 data taking) New Pixel detector (ready for installation in 2016/17 Year End Technical Stop) HCAL upgrade: photodetectors and electronics (HF 2015/16 YETS, HB/HE LS2) Phase 2 upgrades: ≳ 5 x Hz/cm 2 luminosity leveled, ∼ 128 (simulate 140), reach total of 3000 fb -1 in ∼ 10 yrs operation Replace detector systems whose performance is significantly degrading due to radiation damage Maintain physics performance at this very high PU Phase 2 upgrades: ≳ 5 x Hz/cm 2 luminosity leveled, ∼ 128 (simulate 140), reach total of 3000 fb -1 in ∼ 10 yrs operation Replace detector systems whose performance is significantly degrading due to radiation damage Maintain physics performance at this very high PU

7 LS1 and Phase 1

LS1 o Completion of the design for 1x10 34 cm -2 s -1 -Muon endcap system -ME1/1 electronics (unganging) -ME4/2 completion of stations & shielding -Tracker -Prepare for cold operation (-20 o C coolant) o Address operational issues in Run 1 -HF photo-detectors -Reduce beam-related background -HO photo-detectors -operation in return field: replace with Silicon PhotoMultipliers (SiPM) o Preparatory work for Phase 1 Upgrades -New beam pipe and “pilot blade” installation for the Pixel Upgrade -New HF backend electronics - ahead of HCAL frontend upgrade -Splitting for L1-Trigger inputs to allow commissioning new trigger in parallel with operating present trigger 8 ME1/1 ad ME4/2 consolidation during LS1 Slice test:  TCA BE electronics for HF ME1/1 ME4/2 RE4

Phase 1 Upgrades – L1 Trigger Architecture based on powerful FPGAs and high bandwidth optics -Entire upgrade (Calorimeter, Muon and Global triggers) built with three types of board, all using virtex 7 FPGA -Allows much improved algorithms for PU mitigation and isolation -Trigger inputs split during LS1 to allow full commissioning of new trigger in parallel to operating legacy system 9 Staged approach: grow from slice tests to full system commissioning through ready for physics in 2016 Optical splitting for parallel commissioning, calorimeter trigger Level 1 Trigger Upgrade

Phase 1 Upgrades – Pixel Detector o 4 layers / 3 disks -1 more space point, 3 cm inner radius -Improved track resolution and efficiency o New readout chip -Recovers inefficiency at high rate and PU o Less material -CO2 cooling, new cabling and powering scheme (DC-DC) o Longevity -Tolerate up to 100 PU and survive to 500 fb -1, with exchange of innermost layer 10 Ready to install at end of 2016 Pilot blade (partial disk) in LS1

Phase 1 Upgrades – HCAL o Backend electronics upgrade to  TCA o New readout chip (QIE10) with TDC -Timing: improved rejection of beam-related backgrounds, particularly HF o Replace HPDs in HB and HE with SiPMs -Small radiation tolerant package, stable in magnetic field -PDE improved x3, lower noise -Allows depth segmentation for improved measurement of hadronic clusters, rejection of backgrounds, and re- weighting for radiation damage 11 HF BE upgrade in LS1, FE at end of 2015 HB/HE FE upgrade in LS2 Quadrant of HB and HE showing depth segmentation with SiPM readout SiPMs: successful R&D program -Tested to 3000 fb-1 -Neutron sensitivity low

12 Phase 2

13  By LS3 the integrated luminosity will exceed 300 fb -1 and may approach 500 fb -1 (use 500 for detector studies)  We will look forward to over 5x more data beyond that, at significantly higher PU (and steady throughout the fill) and radiation  HL-LHC with lumi-leveling at 5x10 34 cm -2 s -1 will deliver 250 fb -1 per year o Driving considerations in defining the scope for Phase 2 -Performance longevity of the Phase 1 detector -Physics requirements for the HL-LHC program and beam conditions -Development of cost effective technical solutions and designs -Logistics and scope of work during LS3 o The performance longevity is extensively studied and modeled, and the radiation damage models are included in full simulation o While the barrel calorimeters, forward calorimeter (HF) and muon chambers – will perform to 3000 fb -1, it is clear that the tracking system and endcap calorimeters must be upgraded in LS3 Driving Considerations for the Phase 2 Upgrade

Performance Considerations 14 o Mitigation of the effects of high PU relies on particle flow reconstruction and excellent tracking performance. -The Phase 2 tracker design must maintain good performance at very high PU -We propose to extend the tracker coverage to higher η - the region of VBF jets -We are investigating precision timing in association with the calorimeters as a means to mitigate PU for neutral particles o Endcap coverage -The present transition between the endcap and HF, at |η| = 3, is at the peak of the distribution of jets from VBF. We are studying the feasibility of extending the endcap coverage, and integrating a muon tagging station. -This has the potential for a significant improvement for VBF channels, but will have implications for radiation and background levels. Studies are ongoing. -Physics studies ongoing to optimize the requirements in resolution & granularity. o Trigger rates will be a major issue. Increasing thresholds will lose physics acceptance  Increasing latency to 10  s will allow integrating tracking into all trigger objects at L1 (improves lepton id, isolation, & PU mitigation through vertex association) -The trigger bandwidth can be increased to maintain physics acceptance for all physics objects

Phase 2 Tracker: conceptual design 15 o Outer tracker -High granularity for efficient track reconstruction beyond 140 PU -Two sensor “Pt-modules” to provide trigger information at 40 MHz for tracks with Pt≥2GeV -Improved material budget o Pixel detector -Similar configuration as Phase 1 with 4 layers and 10 disks to cover up to ∣ η ∣ = 4 -Thin sensors 100 µm; smaller pixels 30 x 100 µm o R&D activities -In progress for all components - prototyping of 2S modules ongoing -BE track-trigger with Associative Memories x y z “stub” Trigger track selection in FE

Endcap Calorimeters Two approaches a)Maintain standard tower geometry - develop radiation tolerant solutions for EE and HE to deliver the necessary performance to 3000 fb -1 -Build EE towers in eg. Shashlik design (crystal scintillator: LYSO, CeF) -Rebuild HE with more fibers, rad-hard scintillators b)Study alternative geometry/concepts with potential for improved performance and/or lower cost. Two concepts under consideration -Dual fiber read-out: scintillation & Cerenkov (DROC) – following work of DREAM/RD52 -using doped/crystal fibers - allows e/h correction for improved resolution -Particle Flow Calorimeter (PFCAL) – following work of CALICE -using GEM/Micromegas – fine transverse & longitudinal segmentation to measure shower topology 16 EE -Rad tolerant WLS fibers (capillaries under development) -Rad tolerant GaInP “SiPMs” (or fibers to high radius) HE -Development of radiation hard tiles

Muon systems 17 o Improve offline and trigger performance, and provide redundancy in the high rate, high PU forward region  Concept under study to complete muon stations at 1.6 < |  | < 2.4 -GEM in 2 first stations (Pt resolution) -Glass-RPC in 2 last stations (timing resolution to reduce background)  Investigating increase of the muon coverage beyond |  | < 2.4 with GEM tagging station (ME0) coupled with extended pixel (depending on HE upgrade) o R&D activities well underway for GEM and Glass-RPCs

o The L1-trigger will build on the Phase 1 architecture, with -track information (from outer tracker) available to all trigger objects -with increased granularity (EB at crystal level) -ability to operate up to 1 MHz Trigger and DAQ 18 -Match leptons with high resolution tracks  Improved isolation of e, γ, μ, τ candidates -Vertex association to reduce effect of pileup in multiple object triggers o This requires replacement of ECAL Barrel FEE -Allow 10 µs latency at L1 (limited by CSC electronics) -Provides improved APD spike rejection at L1 o HLT and DAQ will be upgraded to handle up to 1 MHz into HLT and 10 kHz out, maintaining present HLT rejection factor “Moore’s Law” ( for CPUs, networks, and storage) suggests that “normal technology improvements” will handle this on the timescale of LS3 New EB FE board

R&D o R&D is essential to develop cost effective solutions that meet the challenge of high radiation and bandwidth o Ongoing developments for Tracker, Track Processor, Calorimeters and Muon chambers. In many cases final design choices are needed in 3-4 years. o Some of the key areas of development include -Radiation tolerant silicon sensors for the pixel and strip detectors  Radiation tolerant ASIC development (including 65  m process), especially for trackers -High bandwidth and radiation tolerant optical data transmission -Radiation tolerant powering scheme -Light mechanical structures, detector assemblies and high density interconnections -Fast processors for track-triggers -Radiation tolerant crystals, tiles and fibres for calorimeters, and radiation hard photo-detectors -High rate gas chambers with improved spatial and timing resolution -Demonstration of high precision timing in calorimeter pre-sampling -Software development for new processing technologies (multicore processing, GPU, etc…) o Many of these areas are are common with other experiments o Progress will be discussed at this workshop – encouraging sharing ideas and common development where possible 19

Concluding remarks 20 CMS has a phased upgrade program to allow the experiment to fully capitalize on the physics potential of the accelerator upgrades. Phase 1 upgrades are progressing well and will ensure that CMS performs well up to peak luminosities >2 x cm -2 s -1, which will be reached by LS3. The longevity of detectors has been thoroughly studied. We conclude that the tracker and end-cap calorimeters must be replaced in LS3. We are developing the full scope of Phase 2 to meet high PU and radiation challenges, supporting a broad and rich physics program at the HL-LHC. R&D support in the 3-4 coming years is critical to demonstrate cost-effective technical solutions for the upgrades.

21 Thanks to LHC for the excellent performance so far.... and for more to come