1. Future Plan at J-PARC Neutrino program with accelerator Physics program at slow extracted beam and Accelerator status The US-Japan HEP Collaboration 30th Anniversary Symposium Oct. 20- Oct.21 Koichiro Nishikawa (KEK)

2. Neutrino program with accelerator past (KEK-12GeV PS), present, future

3. A past US-Japan collaboration - K2K experiment 1999-2005 - JAPAN: High Energy Accelerator Research Organization (KEK) / Institute for Cosmic Ray Research (ICRR), Univ. of Tokyo / Kobe University / Kyoto University / Niigata University / Okayama University / Tokyo University of Science / Tohoku University KOREA: Chonnam National University / Dongshin University / Korea University / Seoul National University U.S.A.: Boston University / University of California, Irvine / University of Hawaii, Manoa / Massachusetts Institute of Technology / State University of New York at Stony Brook / University of Washington at Seattle POLAND: Warsaw University / Solton Institute Since 2002 JAPAN: Hiroshima University / Osaka University U.S.A.: Duke University CANADA: TRIUMF / University of British Columbia ITALY: Rome FRANCE: Saclay SPAIN: Barcelona / Valencia SWITZERLAND: Geneva RUSSIA: INR-Moscow

4. Detection of  from accelerator 250km away Existence of  oscillation

5. 5 Materials and Life Science Experimental Facility Hadron Beam Facility Present and near future of J-PARC J-PARC = Japan Proton Accelerator Research Complex Joint Project between KEK and JAEA Linac 180→400 MeV Neutrino Facility Slow Extracted Beam Facility Rapid Cycling Synchrotron (3GeV, 25 Hz, 1MW) Main Ring (30 GeV, 0.3 Hz, →~1Hz 0.75 MW→ 1.66 MW)

6. J-PARC Facility (KEK/JAEA ） Bird’s eye photo in January of 2008 South to North Neutrino Beams (to Kamioka) JFY2009 Beams Main ring JFY2008 Beams 3 GeV Synchrotron CY2007 Beams Linac Design Intensity 750kW Construction JFY2001~2008

7. 7 T2K (Tokai to Kamioka) experiment High intensity  beam from J-PARC MR to Super-Kamiokande @ 295km Discovery of e appearance → Determine  13 –Last unknown mixing angle –Open possibility to explore CPV in lepton sector Precise meas. of  disappearance →  23,  m 23 2 –Really maximum mixing? Any symmetry? OA3° O A0 ° OA2° OA2.5° Osc. Prob. ＠  m 2 =3x10 -3 eV 2  flux

8. The T2K Collaboration Canada TRIUMF U. Alberta U. B. Columbia U. Regina U. Toronto U. Victoria York U. France CEA Saclay IPN Lyon LLR E. Poly. LPNHE Paris Germany U. Aachen ~500 members, 61 Institutes, 12 countries Italy INFN, U. Roma INFN, U. Napoli INFN, U. Padova INFN, U. Bari Japan ICRR Kamioka ICRR RCCN KEK Kobe U. Kyoto U. Miyagi U. Edu. Osaka City U. U. Tokyo Poland A. Soltan, Warsaw H.Niewodniczanski, Cracow T. U. Warsaw U. Silesia, Katowice U. Warsaw U. Wroclaw Russia INR S. Korea N. U. Chonnam U. Dongshin U. Sejong N. U. Seoul U. Sungkyunkwan STFC/RAL STFC/Daresbury USA Boston U. B.N.L. Colorado S. U. Duke U. Louisiana S. U. Stony Brook U. U. C. Irvine U. Colorado U. Pittsburgh U. Rochester U. Washington Spain IFIC, Valencia IFAE (Barcelona) Switzerland U. Bern U. Geneva ETH Zurich United Kingdom Imperial C. London Queen Mary U. L. Lancaster U. Liverpool U. Oxford U. Sheffield U. Warwick U.

9. 9 Neutrino facility in J-PARC Construction (JFY2004~2008) COMPLETED Target Primary beamline (superconducting) Electromagnetic horn Neutrino monitor bld. Near detectors Decay volume completed Beam dump Target station (He vessel) 9 P0D  detector 2 nd horn Correction magnets

10. Near Detector Neutrino Measurements 10ICHEP2010 -- T.Nakaya (Kyoto) -- dE/dx by TPC (positive) Neutrino interaction proton MIP (  ) electron Neutrino event rate ( INGRID) Neutrino event timing ( INGRID) Jan. 23 rd June 26 th

11. SK first event Feb.24, 2010 11

12. SK observation Event time distribution Event time distribution clearly show beam structure

13. T2K Physics Run begins in 2010. 13 3.3×10 19 protons accumulated (~16[kWx10 7 s]) @ ~50kW level 42 days for physics data Trial up to 100kW successful. ~50kW  Beam Power ~100kW

14. Issues and critical path in neutrino program Beam power –RCS kicker repaired (operation time) –New FX kicker installed this summer (6 ⇒ 8 bunches, >1.210 13 /bunch) –Improvement of MR magnet power supply and RF Repetition rate from 3.52 sec. ⇒ 3.22 sec ( ⇒ 2.64 sec ) Short time goal –150kW 6 months run with 120 days for physics during mid. Nov. 2010 to May 2011 –RCS 500kW (MR 300kW) trial (210 13 /bunch and 8 bunches) Medium period goal –Continuous run with >300kW starting 2011 fall MW*10 7 sec integral power by 2014 Further rapid cycling

16. Quest for the Origin of Matter Dominated Universe One of the Main Subject of the KEK Roadmap Discovery of Lepton CP Violation Proton Decay Discovery of the e Appearance Neutrino Intensity Improvement Huge Detector R&D T2K (2009~) Water Cherenkov v Liquid Ar TPC Establish Huge Detector Technology Construction of Huge Detector

17. Ready for charged particle test-beam @J-PARC View from cathode side (see 1cm strip anode at far side) Observed the first cosmic ray track @KEK (Sep-2) R&D effort of LAr TPC: Low energy charged particle beam @ J-PARC

18. Physics program with slow extracted beam

19. KL K1.8 K1.8BR T1 target 30GeV proton beam Slow extracted beam facility d u u d s Pentaquark  +  He 6 Implantation of Kaon and the nuclear shrinkage K meson Kaonic nucleus Kaonic atom Ｘ ray Ｋ−Ｋ− K1.1BR Oct. 2010 T-viola- tion K  →   L  Free quarks Bound quarks Why are bound quarks haevier ？ Quark Mass without Mass Puzzle  N Z ,  Hypernuclei ,  Hypernuclei Strange ness 0 Hypernuclei -2

20. Slow Extraction Radioactivity by beam loss ⇒∼ 10%

21. Issues and critical path in slow extracted beam program Spill structure Main PS tuning to reduce 600Hz ripple Feedback with RF noise Ripple cancellation system installed Reducing radioactivity of beam line elements Dynamic bump scheme has been installed this summer Starting up now

22. KL K1.8 K1.8BR T1 target 30GeV proton beam SKS Program at slow extracted beam facility starting now d u u d s Pentaquark  +  He 6 K  →   L Test Beam LAr test Extiction measurement For  – e conversion

23. 2009: beamline construction ⇒ beam survey (KL flux) 2010: CsI calorimeter construction ⇒ engineering run beam properties with calorimeter 2011: detector installation ⇒ full engineering run, start physics run 10% intensity(30kW) one month milestones of goal of KOTO exp. (== Step1) ✓

25. Other Particle-Physics experiments at J-PARC New proposal on neutron EDM at J-PARC –With ultra high precision magnetic field measurement New proposal on muon g-2/EDM –See Dr. Saito’s talk

26. Summary All J-PARC started operation Beam power –FX(Neutrino): 50kW stable (100kW trial) realized, aim for 150kW and continuous physics run starting in Nov. –SX: 2.6kW realized, tuning for 5kW continuous operation with new additional hardware Particle physics program: –T2K: Started Data taking! –KOTO: Commissioning of beam done, further beam study with calorimeter installed –Penta-quark search data taking starting up –Intensive work on preparation and R&D on COMET (  e conv.),  g-2/  EDM, nEDM, LiqAr TPC Beam power will be increased in stages toward realizing –Design power of 750kW –Then 1.7MW (KEK roadmap)