CMS Upgrades CMS Plans up to 2020/ 2030? Dan Green Fermilab - - PowerPoint PPT Presentation

06/05/13 U of D0 – CMS Upgrades 1

CMS Upgrades CMS Plans up to 2020/ 2030?

Dan Green Fermilab

06/05/13 U of D0 – CMS Upgrades 2

Why Upgrade?

• The LHC will be the only factory in HEP

for W, Z, t and H production for a long time

• To further the energy frontier we need to

upgrade the detectors and the LHC

■ LS1 – now, 8->14 TeV ■ LS2 – 300 fb-1 by 2012, 2xLo ■ LS3 – 3000 fb-1 by 2030, 2x Lo

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CERN/LHC Planning

• Long

shutdowns in 2013 and 2017

• Much detail
• n the

CERN site

8 TeV 14 TeV 5Lo

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Projected Luminosity

• Long

term plan is 3 ab-1

• Lumi, PU

Up to 5x design

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Present CMS

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CMS Public

• https://cms.web.cern.ch/org/upgrades
• First do no harm

■ Always keep the ability to use the LHC ■ CMS is to be always a running experiment ■ Plan upgrades in synch with LHC upgrades

and schedule.

• Upgrade is in 2 phases – as driven by CERN and

the LHC machine. Focus on Phase 1 construction + Phase 2 R&D at the moment

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Run I Issues

• Tracking

■ Beam pipe, b tags, material ■ Tracker cooling – raddam, conversions ■ Beam gas and pixel readout

• ECAL

■ Crystal raddam ■ Nuclear counter – APD ■ Shaping and OOTPU – play against dE

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Issues - II

• HCAL

■ HPD – HV, aging, B field ■ HF – PMT Cerenkov, punchthrough ■ Scint raddam ■ PF jets and HF – tracking coverage

• Muons

■ DT crate access ■ ME4-2, ME1-1, RPC – complete system

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New Beampipe

• Thinner and

Smaller r b tag

• 4 layers

robust

• Increased

lever arm

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New Pixel Layout

• 4 layers
• Gas cooling
• Services at

larger |y|

• Pixel design

removable flexibility

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Pixel Readout DT

• Beam – gas
• High L
• New RO chip
• Column readout
• ->DT, 20%
• Loss at 5Lo

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Pixel Raddam

• Phase 2

R&D

• Si ?
• Note noise

is ~ few e

• SN > 20x
• Falls to 10x

(D0, CDF?)

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Top Pair Benchmark

• Maintain

CMS physics power into the future

• Studies for

Phase 1, 2Lo

signal fakes

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Pixel/Tracker b Tag

• Phase 1

b tag

• Improved

tag eff

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Present Tracker – Si Strips

Major system replacement in Phase 2. Liquid->gas cooling. DC-DC converters. Track triggering capability

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Tracker Material

• Too much

stuff

• Power

■ dc->dc

• Cooling

■ CO2 gas

• Services at

large |y|

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Tracker Cooling

• Cool to design

values for 14 TeV in 2015

• Needed to

freeze out raddam induced impurities

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L1 Tracker Trigger ?

• Current CMS Trigger uses only

calorimeter and muon at L1

• Trigger will improve granularity and

connectivity in Phase 1 – but....

• Phase 2 R&D

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Phase 1 Pixel Schedule

• Pixels are

Removable

• Gives CMS

great flexibility

• Schedule

for 2017

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HCAL – Depth Segments

• HCAL depth
• Run I – none

(unlike D0)

■ Cost ■ Space

• Advent of

SiPM

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Raddam - Scint/SiPM

• Inner HE: scint → ? quartz? Depth segments.
• SiPM have good raddam properties

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HCAL – Depth and PU

• Depth has better e

isolation with PU

• Better fake jets,

correct e/h Jet leakage

• Raddam weight

Phase 1

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HCAL - SiPM

• Enables

jet depth development

• Better gain, QE

■ Muon ID ■ S/B – depth ■ Timing – PU

• Faster rise time

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HO SiPM

• HO

Installed now

• HPD->SiPM
• Synergy

With ILC R&D

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HCAL Timing

• Scint

flours slow

• SiPM gives

much more gain, QE

• Enables

timing – PU , backgrounds

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HCAL - FEE

• SiPM
• TDC
• uTCA

■ Improved L1 ■ More connectivity

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Depth and Isolation

• Depth

gives better ISO in high PU

• Use first

Thin HCAL Segment

• nly

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HF and VBF

• VBF isolates

WW scatt

• Does H(125)

unitarize?

• Need “tag

Jets” in HF

• Tracking for PF?
• Robust? For PU?

HF, y = (3,5)

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HF – Raddam, Phase 2

• HF quartz

30x the dose here

• Need PF

With PU

Tracking? Timing? R&D now

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ME42 - Completion

• Descoped

In Run 1

• Now restoring

“Run I” CMS design

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ME Trigger and ME4/2

• Many low

Pt muons from b → u+v+c decays

■ Lever arm ■ redundancy

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ME1-1 Completion

• RDMS
• Electronics

■ Ganged ■ Hurts trigger ■ restoring

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MB – DT Trigger

• DT – MB

■ On DT ■ Move off

• Better

granularity

• Improved

Trigger purity

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RPC - Completion

• Descoped

in Run 1

• Being

restored now

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Trigger Upgrade - P1

• Trigger rates are driven by the increase in luminosity, the center-of-mass energy,

and by higher PU

• Mitigate by improving e/γ isolation, τ id, muon pT resolution, muon isolation, jets

with PU subtraction, and L1 menu sophistication

• Increase system flexibility with high bandwidth optical links and large FPGAs,

and standardize on μTCA telecom standard

• Build and commission upgrade in parallel with current trigger system to

safeguard physics, decouple from LHC schedule

• Overall design:

■ Two-layer calorimeter trigger with tower-level precision and PU subtraction ■ Integrated muon trigger combining all 3 muon systems in track-finding ■ Global Trigger not limited by number of triggers (>128) and offering more sophisticated conditions (e.g. invariant mass)

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Trigger Upgrades

• uTCA
• Algorithm

work

e tau

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Trigger Menu – 2 x 10^34

• Isolated

single leptons

• Dileptons
• “SUSY”

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Phase 1 “Cost”

• CERN “Metric”

■ No labor ■ No contingency

• US in “CD-n”

metric

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CMS Upgrades - Summary

• LS1 is presently in train.
• Much of Phase 1 has been vetted

■ Technical Proposal – LHCC ■ Then subsystem TDR ■ Pixel, HCAL and Trigger TDR approved ■ Funding needs to be secured......

• Phase 2 R&D is ongoing. Upgrades will

be more radical in Phase2.

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Beamline Detectors

• Higher L
• Protect

CMS

• Feedback

To LHC

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HCAL - QIE

• Multi-range

Charge sample

• Add TDC

timing

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Depth and PU

• PU

is soft

• Use HCAL

depth

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Present Tracker

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Tracker - Upgraded

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Punchthrough and HF

• High E shower

Cerenkov in PMT

■ Redundant ■ Readout ■ Tight timing