P01 Overview of CMS HL-LHC Upgrades Anders Ryd, Deputy Project - - PowerPoint PPT Presentation

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P01 Overview of CMS HL-LHC Upgrades Anders Ryd, Deputy Project Manager September 17, 2015 A. Ryd, 2015 September 17 Director's Progress Review Overview of CMS HL-LHC Upgrades 1 Outline Overview of CMS HL-LHC Upgrades P5 report

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P01 – Overview of CMS HL-LHC Upgrades

Anders Ryd, Deputy Project Manager September 17, 2015

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Director's Progress Review – Overview of CMS HL-LHC Upgrades

  • A. Ryd, 2015 September 17
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SLIDE 2

Overview of CMS HL-LHC Upgrades

  • P5 report
  • NSF Subcommittee
  • LHC Plans

 Upgrade Plans

  • Summary

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Outline

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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SLIDE 3

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Anders Ryd

  • Professor, Cornell 2003 - preset
  • CMS 2005-present

 Phase-2 U.S. CMS deputy upgrade project manager (2014-present)  Pixel online software/DAQ (2005-2010)  CMS Run coordinator (2010&2011)  Convener of track trigger integration group (2009 and 2012-present)  SUSY searches and ttH  CLEO-c 2003-2011  Hadronic D-decays and precision tracking

 Postdoc, Caltech 1996-2003

 BABAR; L3 trigger, offline software coordinator, and rare B-decays

 Ph.D. UCSB 1996

 CLEO; Semileptonic B-decays and tracking

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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SLIDE 4

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P5 Science Drivers

  • In May 2014 the P5 Report “Building for Discovery:

Strategic Plan for U.S. Particle Physics in the Global Context” laid out a vision based on five intertwined science drivers and the techniques used to access that science. As taken from the report,

Science Driver Technique (Frontier) – Large Projects Use the Higgs boson as a new tool for discovery Energy frontier Pursue the physics associated with neutrino mass Intensity and Cosmic frontier Identify the new physics of dark matter Energy frontier Understand cosmic acceleration; dark energy and inflation

*

Explore the unknown: new particles, interactions, and physical principles Intensity, Cosmic and Energy frontier

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* This appears under medium scale projects

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

Charge 1

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SLIDE 5
  • In any funding scenario considered (A,B,C), the P5

recommendation is

 “Complete the LHC phase-1 upgrades and continue the strong

collaboration in the LHC with the phase-2 (HL-LHC) upgrades of the accelerator and both general-purpose experiments (ATLAS and CMS). The LHC upgrades constitute our highest-priority near-term large project.”

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P5 Recommendation 10

US LHC Phase II Upgrade - Ryd & Tuts

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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  • After the P5 report was public NSF formed a subcommittee

to recommend how the NSF should respond to the P5 recommendations

 The main conclusion regarding the LHC phase-2 upgrades

are summarized in the report:

  • Strong support to pursue the MREFC as the funding vehicle

for the NSP participation in the phase-2 upgrades

MREFC has a minimum of ~ $140M Will be joint for CMS and ATLAS Provides support for university groups 6

NSF Response to P5 Report

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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  • Detailed exploration of the Higgs discovered during Run 1 is
  • ne of the main motivations, e.g. precise coupling strengths:

 Evidence for di-Higges  Tagging of forward jets (VBF)  Searches for new physics,

e.g. SUSY

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Physics Goals for HL-LHC Operation

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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SLIDE 8

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Needs for Phase-2 Upgrades

 Before the start of the Phase-2 operation the CMS will have

recorded at least 300 fb-1 of data

 Detector components such as the central trackers were designed

for this exposure, but beyond this point the performance signifjcantly degrades

 The higher luminosity and the increased pileup (proton-proton

interactions per LHC bunch crossing) at the HL-LHC lead to additional challenges

 Higher occupancy – larger data volumes  Higher radiation  Harder to select (trigger) the interesting physics  This address these challenges we need more powerful detectors to

handle the HL-LHC environment

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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SLIDE 9

HL-LHC will operate with 'lumi leveling':

  • 'Nominal' HL-LHC luminosity 5×1034 Hz/cm2 - <PU>=140
  • 'Ultimate' HL-LHC luminosity 7.5×1034 Hz/cm2 - <PU>=200
  • CMS phase-2 performance targets

 At <PU>=140 same performance as <PU>=50 for phase-1  At <PU>=200 allow moderate degradation

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HL-LHC Luminosity Goals

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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  • The large integrated luminosity and the instantaneous rates

provides a challenging environment

  • Aging studies show that the tracker and endcap

calorimeters need replacement

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Radiation Dose and Particle Rates

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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SLIDE 11

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Main Phase-2 Upgrades

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

Tracker

Higher granularity to handle occupancy Using CMS B=3.8T field to provide input to L1 trigger for

tracks with pT>2 GeV

Extend forward coverage out to η=~4 Reduce material

Endcap calorimeter

Use a high granularity Si sensors with W/Cu absorbers Find segmentation allow 3D shower shape reconstruction

 Trigger/DAQ

 Increase L1 accept rate to 750 kHz  Increase the High Level Trigger (HLT) output rate to 7.5 kHz  Incorporate L1 tracking information, combined with

L1Calo/L1Muon information, in the trigger decision

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Summary of CMS Phase-2 Upgrades

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

~4

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Summary

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

 The HL-LHC upgrade address 3 of the 5 science drives identified in

the P5 report and is ranked the highest priority near term large scale

project.

 The HL-LHC upgrades for CMS has to address many challenges:  High occupancy (Pileup)  Large data rates  Harsh radiation environment  CMS has proposed a series of upgrades to address these challenges  Tracker:  Higher granularity  Selective readout of pT>2 GeV for L1 trigger  Forward pixel extension  High Granularity Calorimeter  3D reconstruction of electromagnetic and hadronic showers  Radiation hardness  Trigger/HLT/DAQ  Increased bandwidth and both L1 and HLT stages  Inclusions of tracking at the first (L1) trigger stage

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Backup

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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Outer Tracker Configuration

 6 Barrel layers and 5 disks (10 and 11 respectively in current tracker)  Increase granularity through short strips  2 sensor modules in all layers for trigger readout (form local correlations

and select hits consistent with pT>2 GeV)

 Long pixels (1.5 mm) in 3 inner layer modules (PS) for z-coordinate  Light module design and mechanics – C02 cooling (-30C) – DC/DC

powering

 Alternative design with tilted modules in PS layers under study  Reduces material and number of modules (degrades L1 track z res.)

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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Pixel Detector Configuration

 Extend tracking coverage in forward region to η=~3.8  Barrel pixels in 4 layers at radii 3, 7, 11, and 16 cm  Forward pixel with 10 disks  The optimal layout is still under study  Readout at 750 kHz – major challenge at <PU>=200  Serial power likely choice

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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Tracking Performance

 Tracking performance with <PU>=140 and 200 similar to the phase-1

detector at <PU>=50.

 Tracker provides a powerful handle to mitigate the PU  Momentum resolution improved over the phase-1 detector due to

reduction of material (CO2 cooling and other optimizations)

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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L1 Tracking Performance

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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High Granularity Calorimeter

 3D shower measurements in HGC  Electromagnetic EE (26 x0, 1.5λ): 28 layers of Si-W/Cu absorber  Front Hadronic FH (3.5λ): 12 layers of Si-Brass absorber  Back Hadronic BH (5λ): 12 layers of Scintilators/Brass

  • A. Ryd, 2015 September 17

Director's Progress Review – Overview of CMS HL-LHC Upgrades

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L1Trigger/HLT/DAQ

 L1Trigger  High BW and powerful processing

boards

 First layer to match detector information  Second layer to produce Trigger objects  DAQ  Similar event builder, HLT, and storage

as present. Increase band width – 800 links at 100 Gbps with 30% occ. will produce 30 Tbps event building throughput.

 HLT  Processing power scales as PU times

L1 rate – need increase of a factor of 50 with respect to Run 2 when operating at <PU>=200.

  • A. Ryd, 2015 September 17

Director's Progres Review – Overview of CMS HL-LHC Upgrades