The High Power Targetry R&D Roadmap for High Energy Physics Workshop @Fermilab, USA 31st May, 2017 High Power Targets at J-PARC #1 High Energy Accelerator Research Organization, KEK J-PARC Center, Materials and Life Science Experimental Facility, Muon Section Shunsuke Makimura #1 (This presentation) #2 by Ishida-san and Chris COMET target at Hadron Experimental Facility Hadron target at Hadron Experimental ADS target at Transmutation Experimental Facility Facility Muon & Neutron Target at Materials and Life Science Neutrino target at T2K Experimental Facility
2 CONTENTS Overview of J-PARC and Targets at J-PARC COMET target at Hadron Experimental Facility ADS target at Transmutation Experimental Facility High energy physics at Materials and Life Science Experimental Facility Targets at Materials and Life Science Experimental Facility Summary
3 This presentation is supplied by Mihara and COMET collaboration Sasa, Meigo and ADS section Maruyama and Sterile Neutrino Search Mibe and G-2/EDM collaboration Aoki and DeeMe collaboration Shimomra and MuSEUM collaboartion Makimura, Matoba, Kawamura and Muon section Haga and Neutron source section
4 Various experiments & targets at J-PARC ADS target at TEF (future plan) Liquid metal, Lead-Bismuth Eutectic Irradiation database in Liquid metal Muon target at MLF Rotating Target, Graphite Materials and Life Science High Energy Physics Muon-Electron Conversion (DeeMe) Muonium Hyperfine (MuSEUM) G-2/EDM Neutron target at MLF Liquid metal, Mercury Materials and Life Science High Energy Physics sterile neutrino COMET target at HEF #1: Graphite #2: Tungsten Hadron target High Energy Physics Neutrino target Muon-Electron Conversion Introduced by Ishida
by Mihara Beam loss: COMET Phase I & II Phase 1: 100 W graphite Phase 2: 4 kW tungsten • Phase I – Detailed understanding of the beam background and achieving the sensitivity of < 10 ‐ 14 (100 better than the current limit) – 8GeV, 3.2kW beam, ~100 ‐ days DAQ (Graphite as Phase I a primary target) Phase II • Phase II – 8GeV, 56kW beam, 1 ‐ year DAQ (Tungsten as a primary target) – COMET final goal Sensitivity < 10 ‐ 16 • Proton beam extinction (w/o extraction) of 10 ‐ 12 has been already achieved (Req. < 10 ‐ 9~10 ) Phase I background Phase I 2013 ‐ 2015 0.03 BG expected Transport solenoid Beam collimator In 7.8x10 6 sec running time Detector Capture Facility construction solenoid solenoid ~5T 2013 ‐ 2018 Proton beam 104MeV/c Magnet construction & installation muons 2018 ‐ 2020 Radiation shield Eng. run & Physics run COMET Phase ‐ I Pion production Phase II Detector target Eng. run in 2022 ‐
Transmutation Experimental Facility (TEF) by Meigo Target facility for ADS in J-PARC 6
Neutron & Muon target at MLF 7 High Energy Physics at MLF Sterile neutrino MuSEUM, DeeMe and G-2/EDM at H Line Muon Target Neutron Target 3GeV-RCS 1MW in future 500 kW in 2014 150 kW at present MLF was constructed for material science. Activities of HEP has been started taking advantage of characteristic of proton beam. Materials and Life Science Experimental Facility (MLF)
Characteristic of proton beam at MLF (1 MW proton beam) Species: proton Energy: 3 GeV (efficient for neutron & muon production) Pulse intensity: 83 tera proton / double pulse Average intensity: 2.0 peta proton / sec (=333.333 microA) Beam pattern: 25 Hz double pulse separated by about 600 ns with 100 ns width (FWHM) for each pulse Spot size: σ x = σ y = 3.5 mm on muon target 18cm(W) x 7cm(H) broaden beam with low beam halo for neutron target 8
by Aoki DeeMe: μ‐ e Conversion Search at H line, MLF Novel Idea: μ‐ e Conversion in the primary production target itself Expected Spectrum (MC) S.E.S: 1 × 10 ‐ 13 ( Graphite Target ), 5 × 10 ‐ 15 ( SiC Target ) • Current Upper Limits: DIO BG BR[ μ ‐ Ti → e ‐ Ti] < 4.6 × 10 ‐ 12 @TRIUMF – BR[ μ ‐ Au → e ‐ Au] < 7 × 10 ‐ 13 @PSI μ‐ e signal – • Status Beam BG (10 ‐ 19 ) – S ‐ type Program: Stage ‐ 2 Approved in 2014 by J ‐ PARC MLF PAC – Ready to go once H ‐ line has constructed Target proton beam Target Signal Region: 102.0 ‐‐ 105.6 MeV/ c S pect rom et er Magnet C apt ure Solenoid Spect rom et er Magnet C apt ure Solenoid (PA CMAN) HS1A,B ,C (PA C MAN) HS1A,B ,C For high efficiency, Transport Solenoid Transport Solenoid High power proton beam HS2 HS2 Tracker Tracker (4 MWPC's) (4 MWPC's) HB 1 HB 1 Target material HS3 HS3 Pulse structure Wien Filt er (not used f or DeeMe) Low B.G. due to fast extraction HB 2 HB 2 B ending Dipole Magnet B ending Dipole Magnet mu ‐ e conversion μ‐ e conversion: rare process Suppress Backgrounds RCS: High ‐ Purity Pulse (D+E)/C < 8 × 10 ‐ 19 Very small “Beam BG” with RCS
by Shimomura MuSEUM: Mu Hyperfine Structure HFS : Mu Hyperfine Structure Zeeman Splitting e ‐ + 4463 MHz e ‐ HFS HFS + ∝ p ∝ p Pure leptonic system For high efficiency, (No composite particle) High power proton beam High efficiency of muon The most precise test to the bound QED production (Energy and Basic input parameter for muon g ‐ 2 material) Probing for new physics Pulse structure 2017/6/6 Informal Lecture
Precise measurements of Muon g-2 and EDM at MLF by Mibe Conventional muon beam π + μ + proton emittance ~1000 π mm ・ mrad Strong focusing to store Muon loss during storage Pion production decay BG π contamination • Anomalous magnetic moment (g-2) Cooling & acceleration • Independent test of the BNL anomaly J-PAR C g-2/ E DM μ + emittance 1 π mm ・ mrad Free from any of above Goal: Δ a μ =0.1ppm For high efficiency, • E lec tr ic dipole moment (E DM) High power proton beam • In search for CPV in lepton sector High efficiency of muon production (Energy and Goal: material) Δ EDM=10 -21 e•cm Pulse structure
by Maruyama Sterile Neutrino Search by neutron target at J-PARC MLF MLF building (bird’s view) Detector @ 3 rd floor Hg target = Neutron (24m from n target) and Neutrino source 50t Gd ‐ loaded liquid scintillator detector (4.4m diameter x • Recently, Technical 4.4m height) image Design Report was 150PMTs submitted to arXiv. 3GeV pulsed proton arXiv:1705.08629 [physics.ins-det] beam • Aim to start the Searching for neutrino oscillation : e with baseline of 24m. experiment around no new beamline, no new buildings are needed quick start ‐ up end of JFY2018.
by Maruyama Principle of experiment and requirement for p beam • Using timing information, we (E resolution = 15%/sqrt(E)) can select the from + only. (bottom), we need shorter pulse beam than muon lifetime. 3GeV • + (and +) must be pulsed (Decay proton stopped at the target. ‐ at ‐ Rest) beam Scintillation light p energy must be 1~3GeV + Selecting muon decay ( ~74%) - and - which creates e (intrinsic BKG) are absorbed by mercury. High -Z material is preferred. (MLF case Scintillation light <T>~30 s decay (at rest)/ decay ~ 0.001) (~ 8MeV In total) 14 For high efficiency, • Neutrino programs always prefer the more intense beam. High power proton beam Multi MW beam is preferable if it can be achieved technically after current design of MLF (1MW). High efficiency of muon production (Energy and material) Pulse structure
Proton beam operation at MLF Tohoku Earthquake Hadron Accident N-target trouble 15
Muon target at MLF Target material is polycrystalline graphite, IG-430U. Thermal resistance (up to 1900 K), Resistance to thermal shock Fixed target is replaced with rotating target to disperse the radiation damage of graphite. 340 mm P-Beam diameter; 14 mm (2 ) 4kW heat @ 1MW proton beam Thickness of graphite 20 mm 70 mm Fixed target, from 2008 to 2014 Rotating target, from 2014 16 Water-cooling by thermal conduction Cooling by thermal radiation Lifetime: Irradiation damage of graphite Lifetime: Bearings 1 year at 1 MW operation Aiming Lifetime: 10 years at 1 MW operation
New developments for Muon target at MLF Diagnostic system for monitoring and foresight of failure Gases analysis, In-situ temperature measurement, Vibration monitoring Material development~ SiC coated graphite and SiC/SiC composite Infrared camera RT testing w/o beam SiC-coated graphite with RaDIATE & US^JP collaboration Presented in Session 2 SiC/SiC composite for resistance to thermal shock, by Muroran Institute of Technology Supported by Kakenhi 1/3 model for muon target Q mass analysis
Neutron Target at MLF 18 by Takada & Haga Top view of horizontal cross section High heat load area Mercury Proton 11 L/s beam Flow vanes ~1m Mercury circulation system Moderator Proton beam Target trolley Reflector Mercury target
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