CMS Submission to PPGC

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CMS Submission to PPGC

• UK Deliverables
• Status of CMS
• UK Progress Commissioning Plans
• Computing
• UK Physics Programme
• Summary

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The CMS Collaboration
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Compact Muon Solenoid
Total weight 12,500 t Overall diameter 15
m Overall length 21.6 m Magnetic field 4 T
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The UK in CMS
Imperial College
Bristol
Brunel
Leaf Card
Source Card
Electromagnetic Calorimeter Endcaps
Tracker Readout System
Global Calorimeter Trigger
Computing - Software - Simulation - Physics
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LHC Intersection Point 5
CMS is pre-assembled on the surface and lowered
in 17 sections weighing between 300 and 2000 tons
Surface Assembly Hall
Experiment Cavern
Service Cavern(Readout, Trigger, P/S)
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Surface Assembly
Yoke Endcap (YE1)installation done
Muon Barrel Drift-Tube/RPC installation well
advanced 10 sectors in wheels 0,1,2. 2 sectors
in wheels -1,-2.
Magnet complete, coil cold
HCAL being inserted into solenoid
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CMS Schedule Key Dates

• Magnet closed May 06
• Magnet test/cosmic ray challenge June-Aug 06
• ECAL 1st half-barrel (EB) installation Aug 06
  SX5
• Service Cavern ready for crates
  April-May 06
• HF lowering July 06
• Experiment Cavern ready for crates Jul 06
• First connection to Service Cavern Aug-Sep 06
• Central Yoke SectionCoil (YB0) lowering Nov
  06
• ECAL 2nd half-barrel (EB-) installation Oct 06
  SX5(Jan-May 07 UXC) Tracker installation
  Jan-Feb 07
• ECAL/Tracker cabling complete Apr-May 07
• Heavy lowering complete Feb-Mar 07
• Initial CMS ready for beam 30 Jun 07
• ECAL Endcaps, Pixels installation Dec 07
  March 08
• Schedule is tight, with no master contingency
• Options to recover 2 months after Tracker
  installation under consideration

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CMS ECAL Endcap (EE)

UK has led EE project from inception - Monte
Carlo simulations - Performance optimisation -
Vacuum Photo-Triode (VPT) RD - Prototype beam
tests at CERN Deliverables - Overall mechanical
design - On-det. electronic design(CERN) -
VPTs (pay 50, test 100) - Mechanical
structures(Russia) - Assembly (with Russia,
CERN)

• Vacuum phototriodes
• - Single stage pmt
• Gain 8 -10 at B 4 T
• Radiation resistant (UV glass window)
• - Q.E. 20 at 420 nm

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EE Status
Electronic noise performance verified with a
detector module (25 channels) mounted on a
Dee (3800 e/channel)
Alignment test of 2 Dees and Ring Flange mounted
on HCAL
Mechanics All major components delivered CMS
Gold Award to TM Engineers (UK)
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EE Future Work
2006 ? On detector electronics production ?
Assembly jigs and tooling completed ? Launch EE
crystal productionSIC (China) ? Assembly of
Dee1 from July 2007 ? Launch EE crystal
productionBTCP (RF) ? Assembly of Dees ?
Installation of Dees 1 2 2008 ? Installation of
Dees 3 4
Delivery of EE crystals is on the critical
pathAssembly schedule tight? Parallel work to
minimise assembly latency Long term UK
commitments - Maintaining and operating the EE -
Maintaining the associated databases -
Understanding and calibrating the detector -
Estimated EID effort 0.25 FTE in 08/09 09/10
EE Commissioning will only START in earnest AFTER
end of Ring Fence
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CMS Tracker

• Two main sub-systems - Silicon Strip Tracker
  and Pixel Detector
• Silicon Strip Tracker comprises - Outer
  Barrel (TOB) - Inner Barrel and Disks
  (TIB-TID) - End-Cap (TEC)
• 107 Channels, 220m2 Silicon

TIB Layer 2, after burn-in
Cosmics in TEC
TOB
TOB
TEC
TEC
TIB
TID
TIB
TID
PD
PD
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Tracker Electronic System

• UK Deliverables
• Development of readout control system
• Delivery of APV APVMUX ASICs ( 100,000
  die, inc spares)
• Procurement of Front End Driver (500
  modules)

• Status
• APV Project Complete On time, within budget
• FED Procurement underway
• (eXception received a Gold Award)

• Analogue readout
• No on-detector zero suppression
• Optical analogue data transfer

Input Rate 1.2 TBytes/sec Output rate 50
GBytes/sec
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Tracker Future Work

• 2006 Final assembly and integration in TIF
• Four large systems to be assembled and operated
• Test complete tracker in up to 25 units
• Delivery within budget requires staff from
  institutes
• 2007 Commissioning at Point 5
• Lower, insert, cable, power,
• Commission off-detector electronics first
  running
• 2008 Operations
• Calibrate and tune performance
• Optimise S/N, cluster finding in firmware
• APV, APV emulator, FED, DAQ, Online Software are
  key elements for Tracker to deliver good data
• All require UK expertise
• System of 500 complex boards
• ? 1 FTE EID needed long term for maintenance

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Global Calorimeter Trigger

• Vital Role in CMS Trigger
• Electron/? triggers
• Jet Triggers
• Transverse Energy Triggers
• RCT Readout System
• Luminosity Monitoring

Original GCT design was technically challenging
- required very high speed (3GB/s) data
transfer between many boards ? major revision Jan
2006 - Large, powerful FPGAs concentrate algorith
m processing in few locations - Optical links
bring large number of input signals to
processing boards New design to be delivered by
July 07 - UK led with CERN engineering effort
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The New GCT Design

• There are four different types of card
• Source Card (54 needed)
• Translates electrical signals from RCT to optical
  
• Leaf Card (8 1(m) needed)
• Main algorithm card of the GCT
• Electron and jet finding and sorting, all ET
  calculations
• Proven design from a satellite project (LANL)
• Concentrator Card (11(m) needed)
• Communicates with rest of Trigger and upstream
  DAQ
• Wheel Card (2 needed)
• Supports Leaf Cards, performs final jet-finder
  calcs

Software Simulation (efficiencies) Testing
and Commissioning Online Monitoring Online
Control
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GCT Future Work
Electron data from ½ RCT
New design can be scaled and commissioned in
stages

• 2006 Development and integration phase
• Aug Integration of Source Card Leaf Card
  
• Oct Integration Source Leaf Concentrator
• 2007 Commissioning phase
• Jan Commissioning Electron Triggers
• Jul Commissioning Jet Triggers
• 2008 Operations phase
• Respond to actual CMS conditions
• Calibrate, evaluate tune trigger performance
• Trigger must operate with 100 availability ?
• 1 FTE EID needed long term for maintenance

Leaf Cards
Wheel Cards
Concentrator Card
Electron data from ½ RCT
Electron data from ½ RCT
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Computing status

• Major milestones in last two years
• CMS Computing Model fully defined, documented in
  Computing TDR
• Operational prototypes of all infrastructural
  software in place
• Major UK contributions to data and workflow
  management systems
• Integration with Grid systems (WLCG) now well
  advanced
• Decision taken to adopt new application framework
  in May 2006
• Upcoming milestones before 2008
• CSA2006 (computing, software, analysis) 25
  scale test of full computing system, October 2006
• Full computing system readiness by April 2007
• Factor-of-two final resource ramp up before April
  2008
• CMSUK Deliverables 2006 - 8
• Delivery and support of software components for
  CMS
• Ramp-up and operation of Tier-1 and Tier-2
  computing centres
• Maintenance and support of computing system for
  UK analysis

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UK Computing Project

• Project organisation
• Organised as single coherent project, covering
  GridPP, e-science, centre operations, service
  challenge effort
• Project currently limited by available manpower
• Further physicist / e-science effort will become
  available in 2007
• Vital to retain our expert GridPP / e-science
  personnel
• Project plan is fully tied to CMS global
  milestones
• Work areas
• Infrastructural software deliverables (key for
  CMS) 2 FTE
• PhEDEx manages all offline data BOSS user
  interface to the Grid
• Computing system ramp-up and support 1.75 FTE
• Software installation and maintainance DB
  management
• Data challenge activities integration with new
  RAL CASTOR system
• Physics ops data handling, reconstruction, MC
  prod 2 FTE
• Documentation, user support for analysis 1 FTE

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Computing Plans Challenges

• Major UK milestones 2006 8
• Jul 06 All UK centres take part in new
  framework MC productionnew user support
  resources (web-based) in place
• Sep Oct 06 Full UK participation in CSA2006
  at 25 scale
• Dec 06 RAL CASTOR system fully integrated with
  CMS system
• Apr 07 UK systems ready to take data final
  versions of PhEDEx, BOSS funded plan for ramp-up
  to full system scale
• Apr 08 Ready for full scale data taking
• Key challenges
• Retention of expert staff systems are highly
  complex, will require constant tuning in 2007
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• Scale of Tier-1 hardware resources
• CMS extremely short of Tier-1 storage and CPU
  UK is the smallest contributor, despite high
  profile on CMS
• CMS Computing Model may be compromised in light
  of the shortfall
• Critical factor for effective physics output in
  UK and Europe

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UK Physics Strategy

• Build on existing expertise
• - Tracker
• - ECAL
• - Test beam analyses
• - Simulation studies
• Plan smooth transition from detector/reconstructi
  on studies to physics
• Emphasise preparations for leading involvement
  in early analyses
• But balance with developing tools to achieve
  longer term physics goals
• Develop close working collaboration with
  theorists to gain an edge
• Work cohesively with the wider world of CMS

• Organisation
• 2 Physics Co-ordinators(One at CERN, One in
  UK)
• Regular programme of meetings

• UK provides Convenors for 3 of the 8 CMS PRS
  Groups (Physics, Reconstruction, Software)
• ECAL- e/g
• Tracker- b/t
• Higgs

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CMS Physics TDR

• CMS physics activities are focused on Physics TDR
• Volume 1 Published December 2005
• - Validation of detector simulation
• - Development of reconstruction algorithms
• - Techniques for Calibration, alignment,
  synchronisation
• Volume 2 To be published May 2006
• - Complete analyses (backgrounds,
  misalignment, miscalibration)
• - Demonstration of physics capability with 10
  fb-1, 30 fb-1 (low luminosity L21033)
• Volume 3 Due January 2007
• - Commissioning
• - Start-up procedures
• - First physics
• - Timing of High Level Trigger processing

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UK Contributions to Physics TDR

• Defining content and work, final editing,
  detailed contributions

Physics TDR Volume I Detector Performance and
Software
ECAL Intercalibration using W?e?
ECAL Test Beam analysis
Super Module
Beam
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UK Contributions to Physics TDR
Physics TDR Volume II Physics Performance
qqH, H ? tt ? l jet
MSSM bbH/A,H/A ?tt ?2 jet
WW, ZZ Fusion
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First Physics

• Exciting results possible with fb-1 of data
• Concentrate initial analysis efforts on early
  discoveries
• Exploit connections between detector
  understanding, reconstruction selection
  algorithms and physics
• Focus on e, t, energy-flow, and then g
• eg Study W ? e?, Z ? ee, leading to W' ? e?,
  Z' ? ee, (and eventually, H ? ZZ ? eell )
• eg Study W jets, Z jets, Z ? tt, leading
  to b-jet tagging, H ? tt searches

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Higgs Physics

• As luminosity increases, concentrate
  progressively on Higgs searches
• Strong UK interest demonstrated by range of
  studies already underway

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Direct g ,Triple Gauge Couplings

• UK leads studies of gluon structure function of
  g through prompt g production
• Useful results with 1-3 fb-1
• Analysis will provide valuable input for
  development of H??? searches
• UK also leads TGC study for Physics TDR
• Responsible for Wg, Zg channels
  backgrounds
• TGC sensitivity requires high L
• If no smoking gun Anomalous TGC could provide
  vital signature of BSM

Wjet background to W?
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Summary of CMS Request
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Summary

• CMS assembly is proceeding without significant
  technical problems
• Solenoid is cold Magnet test and Cosmic
  Challenge start in June
• Schedule is tight for Ready-for-Beam in July 07
• UK Tracker Readout deliverables on schedule
• ECAL Endcap completion limited by crystal
  delivery Install Spring 08
• Revised GCT design is advancing rapidly
• UK-CMS has provided key tools for CMS Computing
  (PhEDEX, BOSS)
• There are concerns about the CMS Tier-1 capacity
• Continuation of posts currently supported by
  GridPP/e-Science is vital
• UK is making strong contributions to CMS Physics
  TDR
• A coherent UK physics programme is underway

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Back-ups
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Tier-1 Issue

• Role of Tier-1 centres
• Long-term storage (curation) of raw data
• Bulk reprocessing of data for reco, skimming,
  calibration, analysis
• Serving data to Tier-2 centres (all data comes
  through Tier-1)
• Stores full copy of AOD
• Resource situation for CMS
• European Tier-1 contributors do not have large
  CMS fractions
• WLCG pledge system results in major shortfall
  in Tier-1 resources
• This is emergent behaviour funding formulae
  may locally make sense in each country, but do
  not address the global problem
• Individual Tier-1 centres are well-run, but far
  below critical mass
• Only US, Italian centres approach nominal
  Tier-1 size
• Strategy
• Funding system must be examined - LHCC asks for
  CMS input
• Must look at new ways to make maximally efficient
  use of resources
• Potential danger if redundancy robustness
  traded against resources
• The CMS computing model may be compromised (in
  Europe)
• Urgent need for adequate and realistic Tier-1
  resources in UK

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WLCG Computing Resources (2008)
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Deployment of effort
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Exclusive diff. Higgs prod. pp? p H p