1 News from the CERN Linear Collider Detector Project Konrad Elsener CERN.
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Transcript of 1 News from the CERN Linear Collider Detector Project Konrad Elsener CERN.
1
News from the CERN Linear Collider Detector Project
Konrad ElsenerCERN
Outline: • Introduction
LCD @CERN: why, who ? CLIC 3 TeV detector issues
• LCD @ CERN: Status and Plans Collaboration with ILC LCD and FCAL LCD plans on other Hardware / Engineering R&D
• Summary
2News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
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Introduction
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Linear Collider Detector Project @ CERN
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Motivation:• Substantial CLIC accelerator effort towards Conceptual Design Report (CDR) for end 2010• Include CDR chapters on the CLIC physics potential, CLIC detector concepts and their related technological issues
CLIC detector concept will be similar to ILC ...… with a few challenging differences !
Note: many years of investment in ILC e+e- physics/detector simulations, hardware R&D and detector concept studies
LCD@CERN: Working together with the ILC detector concepts and with the linear collider detector technology collaborations to study modifications to the ILC concepts for CLIC energies and beam conditions.
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Linear Collider Detector Project @ CERN
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Who are we ?Lucie Linssen (project leader) – project started in January 2009Dieter SchlatterKonrad Elsener (FCAL, MDI)Peter Speckmayer (fellow)Christian Grefe (PhD student)Andre Sailer (PhD student)Marco Battaglia (paid associate, 2009)+ three additional fellows hired (will start later in 2009)+ part time help from CERN staff+ CERN contribution to EUDET+ help from colleagues in FCAL, LC-TPC, CALICE, ILD and SiD, etc.
LAPP Annecy (J.J. Blaising, J. Blaha), ETH Zurich (A. Hervé)and many more.... (apologies !)
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Linear Collider Detector web site:
http://www.cern.ch/lcd
CLIC detector issues
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Main differences with ILC:
• Energy 500 GeV -> 3 TeV• More severe background conditions (beam-beam effect)
• due to higher energy• due to smaller beam sizes
• Time structure of the accelerator• Synchrotron radiation in the magnetic field of the detector
3TeV e+e- -> W+W- -> qqqq
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
CLIC time structure
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Train repetition rate 50 Hz
CLIC
CLIC: 1 train = 312 bunches 0.5 ns apart 50 HzILC: 1 train = 2820 bunches 308 ns apart 5 Hz
Consequences for CLIC detector:• Need for detection layers with time-stamping
• Inner-most tracker layer with ~ns resolution• or …. all-detector time stamping at the 10 ns (?) level
• Readout/DAQ electronics will be different from ILC• Power pulsing has to work at 50 Hz instead of 5 Hz
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
CLIC 3 TeV Beam-induced background
Backgrounds: Due to the higher beam energy and small bunch sizes backgrounds are significantly more severeat CLIC.
Main backgrounds: • CLIC 3TeV beamstrahlung average energy loss: 29% (10×ILCvalue)
– Coherent pairs (3.8×108 per bunch crossing) <= disappear in beam pipe– Incoherent pairs (3.0×105 per bunch crossing) <= suppressed by strong solenoid-field– interactions => hadrons ( 3 hadron events per bunch crossing)
• Muon background from upstream linac– More difficult to stop due to higher CLIC energy (active muon shield ?)
8News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
CLIC 3 TeV centre-of-massenergy spectrum
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Due to beam-beam effects:• At 3 TeV only 1/3 of the luminosity is in the top 1% centre-of-mass energy bin
• asymmetric situation -> many events with large forward / backward boost
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
CLIC synchrotron radiation, solenoid, anti-DiD etc. …
3 TeV, crossing angle 20 mrad
10News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Work by Barbara Dalena, CERN (CLIC study team):- PAC’09 contributed paper “Solenoid and Synchrotron Radiation Effects at CLIC”- presentation at ILC-CLIC LET Beam Dynamics Workshop, 24 June 2009 http://indico.cern.ch/contributionDisplay.py?contribId=20&sessionId=3&confId=56133
CLIC synchrotron radiation,solenoid, anti-DiD etc. …
11News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Work by Barbara Dalena, CERN (CLIC study team):
CLIC20 mrad
CLIC synchrotron radiation,solenoid, anti-DiD etc. …
very recent results - preliminary
12News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
Work by Barbara Dalena, CERN (CLIC study team):
-> Anti-DiD is bad for luminosity at 3 TeV
Work by André Sailer (cf. talk later this afternoon):
-> Anti-DiD is badly needed (BG !)
PS. Barbara Dalena, PAC’09: A longer detector (solenoid) makes things worse !
CLIC IP intra-train feedback (?)
13News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
http://indico.cern.ch/materialDisplay.py?contribId=11&sessionId=10&materialId=slides&confId=56133
cf. Phil Burrows (Oxford)presentation at ILC-CLIC LET Beam Dynamics Workshop, 24 June 2009
avoid delays (“latency”)preferably BPM and Kickerat about 2 m from the IP
needs to be studied(additional source forbackscattering)
CLIC IP intra-train feedback (?)
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http://indico.cern.ch/materialDisplay.py?contribId=11&sessionId=10&materialId=slides&confId=56133
cf. Phil Burrows (Oxford)presentation at ILC-CLIC LET Beam Dynamics Workshop, 24 June 2009
LCD @ CERN :Status and Plans
15News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
LCD collaboration with ILC
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LCD@CERN has joined existing linear collider groups:• ILC detector concepts (LCD members signed LoI’s)
– ILD– SiD– 4th concept
• Technology collaborations (formal agreements / letters)
– LC-TPC (TPC development)– CALICE (calorimetry based on Particle Flow Analysis)– FCAL (very forward region studies)
• European project (CERN is member)
– EUDET
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
LCD project plans
Most of the R&D currently carried out for the ILC isalso relevant for CLIC.In several areas, the detectors for CLIC will be morechallenging than the detector concepts for ILC.
Besides extensive simulation studies and softwaredevelopment for the CLIC detector studies, CLIC-specifichardware and engineering development is required in a number of areas.
Current scenario:Conceptual Design Report: end 2010Technical Design Report: 2015
17News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
LCD working with FCAL
18News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
• initiated by Lucie Linssen in 2008• mask studies by Andrey Sapronov (summer 2008)• CLIC LumiCal studies by Iftach Sadeh• forward region and background studies by André Sailer
• near future: work on beam-beam effect on Bhabha events (BHSE);
other systematics on LumiCal measurements;improved understanding of BeamCal and backgrounds
• on our list of important topics: radiation hard sensors for BeamCal(start learning about sensors, e.g. this week)
LCD working with FCAL
19News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
what could CERN help with ? (with LCD as intermediary) --- we are open for discussion ---
Examples :• special printed circuits (layers e.g. on thin foils,
complex structures such as GEM, etc.)Rui de Oliveira in EN-ICE-DEM
• advice on conductive glue and its problems, alternatives• bonding laboratory (wide range of experience) Ian McGill, Michael Moll in PH-DT-TP
• invitations to CERN, e.g. to initiate contacts
20News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
other Hardware/Engineering R&D
Hardware/engineering R&D needed beyond present ILC developments:• Time stamping
– Most challenging in inner tracker/vertex region– Trade-off between pixel size, amount of material and timing resolution
• Power pulsing and other electronics developments– In view of the CLIC time structure
• Hadron calorimetry– Dense absorbers to limit radial size (e.g. tungsten)– PFA studies at high energy– Alternative techniques, like dual readout
• Solenoid coil– Reinforced conductor (building on, but beyond CMS/ATLAS)– Large high-field solenoid concept
• Precise stability/alignment studies– In view of sub-nm precision required for FF quadrupoles
• Overall engineering design and integration
21News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009 2222
LCD in the CERN MTPapproved by Council on 18 June 2009
Summary
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CLIC physics & detector studies re-started in 2008;LCD@CERN: a project as of 2009, resources in CERN MTP(timely in view of CLIC accelerator effort and CDR deadline end 2010)
co-operation with ILC concepts and collaborations
LCD@CERN • integrates in on-going world-wide LC physics/detector studies• profits from investment in ILC physics/detector simulations, hardware R&D and detector concepts (e.g. FCAL)
Thank you very much for your help !
News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009
SPARE SLIDES
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CLIC Tracking
Vertex and Tracking issues:• Due to beam-induced background and short time between bunches:
– Inner radius of Vertex Detector has to become larger (~30 mm)– High occupancy in the inner regions
• Narrow jets at high energy– 2-track separation is an issue for the tracker/vertex detector– Track length may have to increase (fan-out of particles within jet)
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3TeV e+e- ->t tbar
Lucie Linssen, SPC, 15/6/2009
26Lucie Linssen, SPC, 15/6/2009
distance of leading particles in jets
Jean-Jacques Blaising, LAPP
Extrapolation ILC = > CLIC
27Lucie Linssen, SPC, 15/6/2009
Adrian Vogel, DESY
For full LDC detector simulation at 3 TeVSimulation of e+e- pairs from beamstrahlung
•Conclusion of the comparison:•ILC, use 100 BX (1/20 bunch train)•CLIC, use full bunch train (312 BX)
•CLIC VTX: O(10) times more background•CLIC TPC: O(30) times more background
LDC 3 TeV, with forward mask
<= 10% beam crossing in ILD detector at 500 GeV
28Lucie Linssen, SPC, 15/6/2009
Tentative long-term CLIC scenario
FirstBeam?
TechnicalDesignReport (TDR)
ConceptualDesignReport (CDR)
Project approval ?
2007 2008 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
R&D on Feasibility Issues
Conceptual Design
R&D on Performance and Cost issues
Technical design
Engineering Optimisation&Industrialisation
Construction (in stages)Construction Detector
2009
Technology evaluation and Physics assessment based on LHC results for a possible decision on Linear Collider with staged construction starting with the lowest energy required by Physics
CLIC parameters
29Lucie Linssen, SPC, 15/6/2009
Alternative to PFA calorimetry
R&D on dual/triple readout calorimetry
30Lucie Linssen, SPC, 15/6/2009
Basic principle:•Measure EM shower component separately•Measure HAD shower component separately•Measure Slow Neutron component separately
Dual Triple
EM-part=> electrons => highly relativistic => Cerenkov light emission
HAD-part=> “less” relativistic => Scintillation signal
Slow neutrons => late fraction of the Scintillation signal
Requires broader collaboration on materials + concept
Precise alignment/stability
• Precise alignment studies/technologies– Beam focusing stability !!– How to link left-arm and right-arm?
• Lumical =>measurement using Bhabha scattering• Alignment of last quadrupoles at +- 3.5 m
– ILC alignment requirements => <4 μm (x,y), <100 μm (z)– CLIC requirement is be more severe
31Leszek Zawiejski, FCAL collab.Daniel Schulte CLIC08.
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SiD Forward Region
LumiCal20 layers of 2.5 mm W +10 layers of 5.0 mm W
BeamCal50 layers of 2.5 mm W
3cm-thick Tungsten Mask13cm-thick BoratedPoly
Centered on the outgoing beam line
ECA
L
Beampipe+/- 94 mrad (detector)+101 mrad, -87mrad (ext. line)
Lucie Linssen, SPC, 15/6/2009
Lucie Linssen, SPC, 15/6/2009
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