News from the CERN Linear Collider Detector Project

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

Outline: • Introduction v LCD @CERN: why, who ? v CLIC 3 Te. V detector issues • LCD @ CERN: Status and Plans v Collaboration with ILC v LCD and FCAL v LCD plans on other Hardware / Engineering R&D • Summary News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 2

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

Linear Collider Detector Project @ CERN 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 4

Linear Collider Detector Project @ CERN Who are we ? Lucie Linssen (project leader) – project started in January 2009 Dieter Schlatter Konrad Elsener (FCAL, MDI) Linear Collider Detector web site: Peter Speckmayer (fellow) http: //www. cern. ch/lcd Christian Grefe (Ph. D student) Andre Sailer (Ph. D 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 Si. D, 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 5

CLIC detector issues Main differences with ILC: 3 Te. V e+e- -> W+W- -> qqqq • Energy 500 Ge. V -> 3 Te. V • 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 News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 6

CLIC time structure Train repetition rate 50 Hz CLIC: 1 train = 312 bunches 0. 5 ns apart 50 Hz ILC: 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 7

CLIC 3 Te. V Beam-induced background Backgrounds: Due to the higher beam energy and small bunch sizes backgrounds are significantly more severe at CLIC. Main backgrounds: • CLIC 3 Te. V 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 – • gg 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 ? ) News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 8

CLIC 3 Te. V centre-of-mass energy spectrum Due to beam-beam effects: • At 3 Te. V only 1/3 of the luminosity is in the energy bin top 1% centre-of-mass • asymmetric situation -> many events with large forward / backward boost News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 9

CLIC synchrotron radiation, solenoid, anti-Di. D etc. … 3 Te. V, crossing angle 20 mrad 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/contribution. Display. py? contrib. Id=20&session. Id=3&conf. Id=56133 News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 10

CLIC synchrotron radiation, solenoid, anti-Di. D etc. … Work by Barbara Dalena, CERN (CLIC study team): CLIC 20 mrad News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 11

CLIC synchrotron radiation, solenoid, anti-Di. D etc. … very recent results - preliminary Work by Barbara Dalena, CERN (CLIC study team): -> Anti-Di. D is bad for luminosity at 3 Te. V Work by André Sailer (cf. talk later this afternoon): -> Anti-Di. D is badly needed (BG !) PS. Barbara Dalena, PAC’ 09: A longer detector (solenoid) makes things worse ! News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 12

CLIC IP intra-train feedback (? ) cf. Phil Burrows (Oxford) presentation at ILC-CLIC LET Beam Dynamics Workshop, 24 June 2009 http: //indico. cern. ch/material. Display. py? contrib. Id=11&session. Id=10&material. Id=slides&conf. Id=56133 avoid delays (“latency”) preferably BPM and Kicker at about 2 m from the IP needs to be studied (additional source for backscattering) News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 13

CLIC IP intra-train feedback (? ) cf. Phil Burrows (Oxford) presentation at ILC-CLIC LET Beam Dynamics Workshop, 24 June 2009 http: //indico. cern. ch/material. Display. py? contrib. Id=11&session. Id=10&material. Id=slides&conf. Id=56133 14

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

LCD collaboration with ILC LCD@CERN has joined existing linear collider groups: • ILC detector concepts (LCD members signed Lo. I’s) – ILD – Si. D – 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 16

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 News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 17

LCD working with FCAL • • initiated by Lucie Linssen in 2008 mask studies by Andrey Sapronov (summer 2008) CLIC Lumi. Cal 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 Lumi. Cal measurements; improved understanding of Beam. Cal and backgrounds • on our list of important topics: radiation hard sensors for Beam. Cal (start learning about sensors, e. g. this week) News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 18

LCD working with FCAL 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 Mc. Gill, Michael Moll in PH-DT-TP • invitations to CERN, e. g. to initiate contacts News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 19

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

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 News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 21

LCD in the CERN MTP approved by Council on 18 June 2009 News from LCD@CERN – presented by K. Elsener, FCAL meeting Zeuthen, 29 -30 June 2009 22 22

Summary 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 23

SPARE SLIDES 24

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) 3 Te. V e+e- -> t tbar Lucie Linssen, SPC, 15/6/2009 25

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

Extrapolation ILC = > CLIC <= 10% beam crossing in ILD detector at 500 Ge. V Adrian Vogel, DESY For full LDC detector simulation at 3 Te. V 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 Lucie. O(30) Linssen, SPC, 15/6/2009 • CLIC TPC: times more background LDC 3 Te. V, with forward mask 27

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

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

Alternative to PFA calorimetry R&D on dual/triple readout calorimetry 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 Lucie Linssen, SPC, 15/6/2009 30

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 Daniel Schulte CLIC 08. Leszek Zawiejski, FCAL collab. 31

Si. D Forward Region Lumi. Cal 20 layers of 2. 5 mm W + 10 layers of 5. 0 mm W ECAL Beam. Cal 50 layers of 2. 5 mm W Beampipe 3 cm-thick Tungsten Mask 13 cm-thick Borated. Poly +/- 94 mrad (detector) +101 mrad, -87 mrad (ext. line) Centered on the outgoing beam line Lucie Linssen, SPC, 15/6/2009 32

Lucie Linssen, SPC, 33 15/6/2009