1. 1 News from the CERN Linear Collider Detector Project Konrad Elsener CERN

2. 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

3. 3 Introduction News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009

4. Linear Collider Detector Project @ CERN 4 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

5. Linear Collider Detector Project @ CERN 5 Who are we ? Lucie Linssen (project leader) – project started in January 2009 Dieter Schlatter Konrad 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

6. CLIC detector issues 6 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

7. CLIC time structure 7 Train repetition rate 50 Hz CLIC CLIC: 1 train = 312 bunches0.5 ns apart50 Hz ILC:1 train = 2820 bunches308 ns apart5 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

8. CLIC 3 TeV Beam-induced background Backgrounds: Due to the higher beam energy and small bunch sizes backgrounds are significantly more severe at CLIC. Main backgrounds: CLIC 3TeV beamstrahlung average energy loss: 29% (10×ILC value ) –Coherent pairs (3.8×10 8 per bunch crossing) <= disappear in beam pipe –Incoherent pairs (3.0×10 5 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

9. CLIC 3 TeV centre-of-mass energy spectrum 9 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

10. 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

11. 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): CLIC 20 mrad

12. 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 !

13. CLIC IP intra-train feedback (?) 13 News 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 Kicker at about 2 m from the IP needs to be studied (additional source for backscattering)

14. CLIC IP intra-train feedback (?) 14 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

15. LCD @ CERN : Status and Plans 15News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009

16. LCD collaboration with ILC 16 LCD@CERN has joined existing linear collider groups: ILC detector concepts (LCD members signed LoI’s) –ILD –SiD –4 th 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

17. LCD project plans Most of the R&D currently carried out for the ILC is also relevant for CLIC. In several areas, the detectors for CLIC will be more challenging than the detector concepts for ILC. Besides extensive simulation studies and software development for the CLIC detector studies, CLIC-specific hardware and engineering development is required in a number of areas. Current scenario: Conceptual Design Report: end 2010 Technical Design Report: 2015 17News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009

18. 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)

19. 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

20. 20News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29-30 June 2009

21. 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

22. 22 LCD in the CERN MTP approved by Council on 18 June 2009

23. Summary 23 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

24. SPARE SLIDES 24

25. 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) 25 3TeV e + e - ->  t t bar Lucie Linssen, SPC, 15/6/2009

26. 26Lucie Linssen, SPC, 15/6/2009 distance of leading particles in jets Jean-Jacques Blaising, LAPP

27. Extrapolation ILC = > CLIC 27Lucie Linssen, SPC, 15/6/2009 Adrian Vogel, DESY For full LDC detector simulation at 3 TeV Simulation 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

28. 28Lucie Linssen, SPC, 15/6/2009 Tentative long-term CLIC scenario First Beam? Technical Design Report (TDR) Conceptual Design Report (CDR) Project approval ? 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

29. CLIC parameters 29Lucie Linssen, SPC, 15/6/2009

30. 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

31. 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 31 Leszek Zawiejski, FCAL collab.Daniel Schulte CLIC08.

32. 32 SiD Forward Region LumiCal 20 layers of 2.5 mm W + 10 layers of 5.0 mm W BeamCal 50 layers of 2.5 mm W 3cm-thick Tungsten Mask 13cm-thick BoratedPoly Centered on the outgoing beam line ECAL Beampipe +/- 94 mrad (detector) +101 mrad, -87mrad (ext. line) Lucie Linssen, SPC, 15/6/2009

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