The ILC and DESY 5 th Workshop on

The ILC and DESY 5 th Workshop on Scientific Cooperation JINR, Dubna January 2005 R. -D. Heuer, DESY and Hamburg Univ.

Standard Model today enormously successful: ● tested at quantum level ● (sub)permille accuracy But: many key questions open ● origin of electroweak symmetry breaking ● unification of forces ● extra space dimensions ● origin of dark matter/energy ● …. (LEP/SLC/Tevatron…)

Next steps at the energy frontier There are two distinct and complementary strategies for gaining new understanding of matter, space and time at future particle accelerators HIGH ENERGY direct discovery of new phenomena i. e. accelerators operating at the energy scale of the new particle HIGH PRECISION Access to new physics at high energies through the precision measurement of phenomena at lower scales Prime example for this synergy: LEP / Tevatron © Physics Today

The power of e+e- Colliders Electron-Positron Linear Collider offers ● well defined initial state collision energy √s well defined collision energy √s tuneable precise knowledge of quantum numbers polarisation of e- and e+ possible ● Clean environment collision of point-like particles → low backgrounds ● precise knowledge of cross sections ● Additional options: e-e- , eγ , γγ collisions Machine for Discoveries and Precision Measurements

Requirements from Physics ● Selection of rare processes (e. g. σ = 0. 3 fb for ZHH) ● Precise reconstruction of momenta of leptons, photons, jets, missing energy • ZHH ØAccelerator with high luminosity ØDetector for precision measurements

Ex. : Higgs physics Recoil mass spectrum ee -> HZ with Z -> l+l- Precision measurements of Higgs couplings model independent measurement Precise enough to distinguish SM Higgs from e. g. MSSM Higgs

International Consensus A world-wide consensus has formed for a baseline LC project in which positrons collide with electrons at energies up to 500 Ge. V, with luminosity above 1034 cm-2 s-1. The energy should be upgradable to about 1 Te. V. Above this firm baseline, several options are envisioned whose priority will depend upon the nature of the discoveries made at the LHC and in the initial LC operation. Substantial overlap in running with LHC recommended

International Consensus cont‘d Study groups of ACFA, ECFA, HEPAP The next large accelerator-based project of particle physics should be a linear collider US DOE Office of Science Future Facilities Plan: LC is first priority mid-term new facility for all US Office of Science ACFA, ECFA, HEPAP (January 2004) The chairs reaffirmed their community’s priorities for a 500 Ge. V linear collider operated in parallel with the LHC Major Funding Agencies Regular meetings concerning LC

International Consensus cont‘d OECD Ministerial Statement (January 2004) “…noted the world wide consensus of the scientific community, which has chosen an electron-positron linear collider as the next accelerator-based facility to complement and expand on the…LHC…” ICFA (i. e. CERN, DESY, FNAL, KEK, SLAC etc) (February 2004) reaffirms its conviction that the highest priority for a new machine for particle physics is a linear electron-positron collider with an initial energy of 500 Ge. V, extendible up to about 1 Te. V, with a significant period of concurrent running with the LHC

ILC: Machine

Next Milestones towards an International Linear Collider planning early 2004 Selection of Collider Technology (warm or cold) and setting up of an international project team with branches in America, Asia and Europe 2005 Continuation of discussion between funding agencies 2006 Further studies of organisational structures 2005 Start of work of project teams (‚Global Design Initiative‘) 2006 Completion of the project layout (CDR) including costing 2007/8 Submission of TDR to governments to go ahead with LC 2008 2009 Start major spending 2009 2015 Start of commissioning

August 2004 Technology decision ITRP recommended that the ILC be based on superconducting RF technology developed by the TESLA collaboration Rationale: • The large cavity aperture and long bunch interval simplify operations, reduce the sensitivity to ground motion, permit interbunch feedback, and may enable increased beam current. • The main linac and rf systems, the single largest technical cost elements, are of comparatively lower risk. • The construction of the superconducting XFEL free electron laser will provide prototypes and test many aspects of the linac. • The industrialization of most major components of the linac is underway. • The use of superconducting cavities significantly reduces power consumption. ICFA unanimously accepted this recommendation

Next Milestones towards an International Linear Collider First ILC Workshop November 2004 at KEK - first meeting after the technology decision - attended by > 220 accelerator experts from Asia, America, Europe - very constructive and stimulating atmosphere - working groups established to prepare for the ILC design parameters and to address the most urgent R&D issues

Next Milestones towards an International Linear Collider Status today 2004 Selection of Collider Technology: done 2005 Continuation of discussion between funding agencies: FALC 2006 2005 Start of work of project teams (‚Global Design Initiative‘) Project leader to be appointed February 2005 Next ILC Workshop: August 2005 (Snowmass) 2006 Completion of the project layout (CDR) including costing 2007/8 Submission of TDR to governments to go ahead with LC 2009 Start major spending …. on track…

ILC: Detector

high statistical power of LC has to be met by high detector resolution (limit systematics) ILC Detector R&D High precision measurements demand fundamentally new approach to the reconstruction: particle flow (i. e. reconstruction of ALL individual particles) requires unprecedented granularity in three dimensions R&D needed NOW for key detector components vertex tracking calorimeter Presentation by W. Lohmann, A. Olchevski

ILC Detector Concept Studies • Detector R&D: R&D for detector components • Detector Concept Studies: optimisation of the full detector design • Detector Concept Studies needed for cost estimates and TDRs in the context and timeline of the GDI activities • at present three detector concept studies ongoing: - one based on SI tracking - two based on gaseous tracking • These detector studies should preserve the already existing detector technology collaborations which address R&D on detector technologies to first order detector concept independent Detector R&D collaborations can/should contribute to multiple detector concept studies

ILC at DESY Machine Detector + Physics

ILC at DESY ILC is highest priority after HERAII for HEP at DESY Leading role of DESY in accelerator, physics and detector in this global effort Plan to set up a European ILC centre at DESY‘s strategic role - Scientific contributions (accelerator, physics, detector) - Coordination and steering - Infrastructure for accelerator and detector design and construction, computing, analysis centre - Connection with Research and University Institutes Central role from the very beginning and in future throughout all phases of the ILC project

DESY ILC Project Group Accelerator - Experimentation - Physics Connection to XFEL Accelerator Physics and Design Scientific Program High Gradient Cavities Detector Cryo Modules Stabilisation, Vibration Diagnostics Operability, Reliability, Controls GAN LLRF Computing

Detector R&D and Concept Studies at DESY Detector R&D in international collaborations: TPC Hadronic Calorimeter (scintillator based) Forward Calorimetry Vertex Detector Concept: emphasis on gaseous tracking Infrastructure for detector studies: Electron testbeam Teststand with 5 T magnet

ILC machine activities at DESY - Technology related high quality, high gradient cavities and modules module test stand … - Technology independent (polarised) positron source reliability issues luminosity performance Global Accelerator Network … - Exploitation of Synergy XFEL <-> ILC - Backbone: TESLA Test Facility

ILC machine activities at DESY Within the framework of the European Union: European Design Study Towards a Global Te. V Linear Collider - Focus on technology independent R&D items - Scientific coordination jointly by CERN and DESY

EUROTe. V more details: http: //www-flc. desy. de/eurotev/ Duration: 3 years Start foreseen: 01 Jan 2005 Total Budget: 29. 073 M€ EU requested: 11. 252 M€ (approved: 9 M€) 23 Participating Laboratories and Institutes (France, Germany, Italy, Sweden, Switzerland, United Kingdom, plus CERN) 8 Workpackages : Management Beam Delivery System Damping Rings Polarised Positron Source Diagnostics Integrated Luminosity Performance Studies Metrology & Stabilisation Global Accelerator Network Multipurpose Virtual Laboratory

Synergy ILC and XFEL accelerator modules module test / magnets / cryogenics linac components (injector, bunch compressors, diagnostics, dumps) Photons FEL concepts Controls / Operability Infrastructure (site, civil construction, survey, tunnel layout, utilities) Safety Organisation Note synergy!

The TESLA Test Facility RF gun Laser 4 Me. V M 2 M 1 bunch compressor 150 Me. V M 3 M 4 M 5 M 6 M 7 bunch compressor 450 Me. V collimator 1000 Me. V undulator s bypass FEL experimental area 250 m Beam time: ~30% ILC related R&D, ~70% XFEL (experience also for ILC)

Summary DESY will continue its strong role within the global ILC project as a European ILC centre within a network of accelerator laboratories in all areas: - accelerator - detector - physics studies wherever the ILC will be located i. e. Asia, America, or Europe (DESY) Looking forward to a strong collaboration with JINR and Russian Institutes