KEK/Japan – CERN collaboration on Linear Collider studies Substantial activities related to accelerator work and now also detectors Based on CERN-KEK agreement.

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KEK/Japan – CERN collaboration on Linear Collider studies Substantial activities related to accelerator work and now also detectors Based on CERN-KEK agreement and CLIC – ILC common working groups Plans at CERN the common years

Accelerator collaborations Key topics: X-band structure development and testing (previous talk) Tests of X-band accelerating structures at KEK are vital for CLIC (T. Higo et al.) We also profit from the experience in building structures We profit from X-band klystron expertise of Japanese industry ATF2-3 activities (J. Urakawa, T. Tauchi) Collaborations within the CLIC- ILC working group framework Sources (T. Omori et al.) Damping ring beam dynamics (K. Kubo et al.) Beam dynamics from damping ring to IP (K. Kubo et al.) Generic (often informal) collaborations on many fundamental topics Electron cloud (K. Ohmi et al.) Two-stream instabilities (K. Ohmi, K. Oide et al.) Coherent synchrotron radiation (K. Oide et al.) Super-KEKB and CLIC damping ring have similar (potential) problem BDS + Collision Point (T.Tauchi)

ATF + ATF2 Past and Current Profits A most important test facility for damping ring and beam delivery system issues BDS tuning is a critical issue for CLIC and ILC, we learn enormously from ATF2 experience Test of FONT (Feedback On Nano-second Timescales) World leading BPM resolution Extraction kickers Operation of ATF We contributed in the past E.g. optimisation code (MAPCLASS) CSR calculations for ATF (F. Zimmermann) A CERN/Spanish PhD student work on ATF2 (Eduardo Marin Lacoma) Very important is training of young people at ATF/ATF2 This year CERN hired two former PhD students from ATF2 as fellows (Yves Renier and Benoît Bolzon) Example above – CERN PhD student working on ATF2

ATF3 We are considering a number of topics for increased future collaboration at ATF2 and ATF3 Very small beta-function to match CLIC chromaticity Limited by QF1, consider providing one with larger aperture Ground motion feedback/feed-forward Install ground motion sensors on each relevant magnet to predict beam orbit Test of quadrupole stabilisation in ATF extraction Could be best way to verify stabilisation performance with beam We will develop damping ring extraction kickers systems Would need ATF3 to verify kicker performance Superconducting wiggler for ATF Coherent synchrotron radiation induced beam instability Experiments would allow to distinguish between different theories (F. Zimmermann) BPM tests CLIC main linac BPMs developed by FNAL could be tested at ATF2 More BPMs should follow in the future We would like to contribute to ATF2/3 operation to gain more experience

Positron Source (Hybrid Target) Hybrid target The CLIC baseline Alternative source for ILC Test at KEKB linac are crucial

Positron Source (Compton Source) At CLIC serious alternative source Polarized positrons will be increasingly more important in the future But feasibility needs to be established Optical cavity work at KEK is fundamental CERN is involved via French collaboration T. Omori (KEK) et al

Lucie Linssen CERN-KEK meeting CERN-Japan collaboration on Linear Collider Detector studies Collaboration is uniquely based on areas of synergy between ILC and CLIC detector studies, such as: ILD detector concept studies Event generation and grid production Flavour tagging for LC Detector magnet system R&D LC-TPC studies with GEMs and S-Altro electronics

Lucie Linssen CERN-KEK meeting ILD detector concept studies Event generation and production LCFI flavour tagging for LC Until now, Japanese participation to CLIC detector study has been on a voluntary basis. Expert knowledge transfer and contributions from Japan are essential for the CLIC detector studies and physics simulations. Particular mention: Contributions to CLIC physics/detector CDR editing: A. Miyamoto (KEK), T. Takeshita (Shinsu Univ.), T. Matsuda (KEK+DESY), Y. Makida (KEK) Expert advice on event generation, and contact for grid production at KEK: A. Miyamoto (KEK) Common LCFI flavour tagging package for LC: Maintained and developed by Univ. of Tokyo, KEK, Tohoku Univ., and Nippon Dental Univ. R&D on Linear Collider TPC with GEMs and Pad readout (SALTRO electronics): K. Fujii (KEK), T. Matsuda (KEK+DESY) et al.

Lucie Linssen CERN-KEK meeting Detector magnet system R&D Collaboration with KEK on: Common R&D on reinforced conductor for ILC and CLIC detector solenoid Development of materials for conductor reinforcement Extrusion test of a large reinforced conductor, based on Rutherford cable and Ni- reinforced aluminium from ATLAS solenoid. Test performed in Switzerland. Expert contribution from KEK highly desirable (A. Yamamoto, Y. Makida) Design of anti-solenoid, surrounding the final-focus quadrupole in the CLIC detector. This project has synergy with COMET pion capture magnet. Technology solutions overlapping with BESS balloon magnets. CLIC_ILD detector concept Detector solenoid 4 Tesla, 3.4 m inner bore Anti-solenoid 1.4 Tesla, 0.5 m radius

CERN LC programme Before 2011 CDR (2011), CLIC feasibility – Project Preparation phase, some specifically for CLIC, some generally for a LC Review of the CLIC baseline design, taking into account CDR results and including: cost & power consumption optimization energy staging technical risks and performance risks Technical developments and test of critical component and prototypes, using several facilities across the collaboration Exploitation and upgrade of CTF3 to CTF3+, construction and commissioning of CLIC drive beam injector Machine/Detector interface (in a wide sense – including push-pull) Detector R&D and studies Physics studies including guidance from LHC and Tevatron results Site studies Organization and Governance

Summary Two main messages: A very significant number of collaborative efforts in the Linear Collider R&D area - implemented in the frameworks of the current CERN-KEK agreement or CLIC-ILC combined working groups, or in some cases purely scientific contacts between experts working on similar problems. Many (most) of the LC activities at CERN and Japan will benefit from continued and strengthened collaboration, including more exchange of people The possibility to involve Japanese scientists being placed at CERN in the Linear Collider activities here – machine studies or detector studies – would be very interesting in the coming years