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Spin at J-PARC

Spin at J-PARC. Naohito Saito for Shoji Nagamiya. Executive Summary. Spin physics at J-PARC, now The facility is starting up; Only spin physics would be T-reversal experiment (E06; TREK) in the existing facility Spin physics plans in a future Proposals for spin polarized proton beams

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Spin at J-PARC

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  1. Spin at J-PARC Naohito Saito for Shoji Nagamiya

  2. Executive Summary • Spin physics at J-PARC, now • The facility is starting up; • Only spin physics would be T-reversal experiment (E06; TREK) in the existing facility • Spin physics plans in a future • Proposals for spin polarized proton beams • Muon g-2 / EDM experiment • Neutron EDM experiment • Collaboration • Collaboration with Brookhaven National Lab • BNL - RIKEN Collaboration • US Japan framework (BNL – KEK) • We are open for any other possibilities for collaboration

  3. J-PARC Facility (KEK/JAEA) LINAC 3 GeV Synchrotron Neutrino Beam To Kamioka Materialand Life Science Facility Main Ring (30 GeV 50 GeV) Hadron Hall Bird’s eye photo in Feb. 2008

  4. Proposals at MR

  5. Zoom in to Proposals Hyper Nuclear Physics Drell-Yan Hyper Nuclear Physics Time Reversal Spin Physics Hyper Nuclear Physics Hyper Nuclear Physics Neutrino Physics Hyper Nuclear Physics K Rare Decay Hyper Nuclear Physics Hyper Nuclear Physics Exotic Search Spin Physics

  6. pC CNI Polarimeter Extracted Beam Polarimeter Pol. H- Source rf Dipole 30% Partial Helical Siberian Snakes 180/400 MeV Polarimeter Polarized proton acceleration at J-PARC BRAHMS & PP2PP PHOBOS Absolute Polarimeter (H jet) RHIC pC Polarimeters PHENIX STAR Collaboration with BNL Pol. H- Source LINAC BOOSTER rf Dipole AGS Warm Partial Helical Siberian Snake 200 MeV Polarimeter AGS Internal Polarimeter AGS pC Polarimeters Cold Partial Helical Siberian Snake

  7. Accelerating polarized protons in Main Ring • Beam energy: 3 GeV ~ 50 GeV (G = 7.5 -- 97.5) • Design working point: Qx = 22.339, Qy = 20.270 • Many imperfection resonances • Strong intrinsic resonance J-PARC Spin Physics Workshop

  8. Spin Tracking in MR (A. Luccio) • Single particle tracking at the nominal tune of the lattice • The polarization is lost at the resonances at Gg = 3N +- n With Snakes e=4p mm mrad No Snake e=10p mm mrad • Qx = 20.128 • Qy = 20.960 J-PARC Spin Physics Workshop

  9. Courtesy of T. Roser Possible locations of partial snakes in MR First 30% snake Second 30% snake J-PARC Spin Physics Workshop

  10. Hyper-Nuclei, LL Hyper-Nuclei • Spectroscopy of Hyper-Nuclei • Neutron Rich Hyper-Nuclei • X-Atom, Pentaquark,…. Kaonic Nuclei Kaonic Atom Eta meson Nuclei Early Phase Experiments at Hadron Hall Beam Dump K1.8 (Fall,2009~) KL Handron Hall K1.8BR (Dec.2008~) • Production • target (T1) K1.1 30 (→ 50) GeV primary beam K0.8

  11. Parking Lot Solution? 60 m

  12. Possible Extension of Hadron Hall To G-2 beam line

  13. Number of Users: about 3,000 Neutron Beam Lines (23 total) Neutron Beam Lines (23 total) Target Station Scattered Neutrons Experimental Devices Proton Beam Materials & Life Experimental Facility Neutron Scattering Area Muon Experimental Area Proton Beam

  14. Muon Beam Production Area

  15. backups

  16. Muon Storage Ring • BNL-E821 achieved ultra precision as such large magnet (14 m – diameter) • Local uniformity ~ 100 ppm  0.1 ppm integrated field • Smaller Ring with Hi Field just matches with MRI technology • Active shimming – 1 ppm local uniformity • High field (~ 7 T) with large gap (~ 40 cm) is possible

  17. Muon magnetic moment • Magnetic moment and spin can be related as • Dirac equation predicts g=2 • Radiative corrections (including NEW PHYSICS) would make g≠2 a=0 a=1.2e-3 for e, m, … a=1.8 for proton a≠0

  18. a≠0 SM Contribution to • Any particle which couples to muon/photon would contribute : QED >> Hadron > Weak

  19. Current Precision • E821 at BNL-AGS measured down to 0.7 ppm for both m+ and m- • 3.4 sigma deviation from the SM • Need to explore further

  20. Muon g-2 in the LHC era • Even the first SUSY discovery was made at LHC, the muon g-2 measurement remains unique to determine SUSY parameters: m and tanb

  21. Shipping to J-PARC • Estimated to be $2.5M • Need to be refined

  22. Muon Facility at MLF • Only One port out of four ports are instrumented • Muon team welcomes new initiative!

  23. From Miyake-san High Momentum Decay Muon Port ? (In future) • ２００５ • Building construction • M2 tunnel BL component manufacture ２００６ • M2 tunnel BL component install • Air Cooling system、Electricity • ２００７ • M2 tunnel BL commissioning • SCS channel install • ２００８ • Exp apparatus for general user • Surface muon channel (tunnel-B3) • Front magnet for slow muon Phase IIa J-PARC Plan for FY 2007-8 07.6 ceiling shield 07.9 solenoid install 07.12 radiation safety 08.3-9 proton beam Project budget 　（2005−8） Special budget for PS-experimental. 　（2005−8） Phase IIbudget (2008-2011) Phase IIa 107/s Super Omega muon channel 2008/9 muon beam Decay/Surface MuonPor +,- / 107/s 4MeV-40MeV

  24. Intense Ultra Slow Muon Source @J-PARC At J-PARC, Aiming at; Repetition Rate25 Hz (At RIKEN-RAL 50 Hz) factor 2 times Surface Muon Yield by Super Omega Channel 4.0 x 108 /s / 1.2 x 106 /s (RIKEN-RAL) = 333 times Lyman-Intensity by Laser Development 100 J/p / 1 J/p (RIKEN-RAL) = 100 times From Miyake-san Iwasaki, Wada, Midorikawa et al. at RIKEN Our Goal of Ultra Slow Muon Yield is 20 /s x 2 x 333 x 100 = 1.3 x 106/s (104/s without Laser Developments) Riken-RAL Slow Muon Intensity Maximum J-PARC Slow Muon Intensity

  25. Re-Acceleration • Consulted Takayama-san, Yokoya-san, Sato-san • Takayama-san is exploring the possibility • And also suggested to explore LINAC option • LINAC Systems • Don Swenson et al. • 10 MeV Proton Linac < $3M

  26. Muon Trio (named by Kuno-san) Aoki-san’s Slide @ NuFact ‘03

  27. Muon EDM • Direct CPV in Lepton Sector • Current Exp. Limit ~ 1e-19 • Potential Sensitivity of J-PARC • ~ 1e-22 @ MLF • ~ 1e-24 w/ PRISM

  28. RSC-MLF vs MR-Hadron Hall

  29. Optimization of muon mom. Mev/c Mev/c Mev/c Mev/c

  30. Muon Beam available at J-PARC Muon Surface Muon Port 3000 times as KEK-MSL 30 times as RIKEN-RAL Super Omega Muon Port Decay/Surface Muon Port From Miyake-san

  31. Muon g-2@J-PARCL. Roberts, D. Hertzog, Y. Kuno and N. Saito, et al • Current result is 3.4 sigma above from the SM value • If LHC discovers SUSY, tan b can be determined to Dtan b ≤ 20% • LOI submitted in 2003 to improve the precision (AGS) by up to one order of magnitude at J-PARC • Efforts toward a proposal have started to realize the experiment in the earlier phase of J-PARC • Technical feasibility of bunch sequences and beamline are being explored • Harmonics changes in the MR and kicker design are key issues • KEK designed new inflector for a better muon injection efficiency • g-2 ring to be shipped from BNL

  32. Muon Spin precession Expected to be Measured to be

  33. How it is Measured? • Precession frequency (wa) of muon spin in the storage ring is measured;

  34. Muon g-2 Ring at BNL

  35. Brain-storming! • Why at magic gamma? • What if no E-field? ⇒requires ultra cooled muon beam Dp/p << 1e-5 Muon collider technique? Cooling, FFAG etc. Ultra-Slow Muon Source at J-PARC MLF?

  36. Ultra-Slow Muon SourceK.Nagamine et al. PRL 74 (1995) 4811Y.Matsuda et al. NP B(Proc) 155 (2006) 346 • Laser Ionization of Muonium

  37. Super-Omega Muon Beamlinefor Intense Ultra Slow Muon Beam Phase 2 ~ 400mSr (0.3T) Normal Conducting(MIC) Capture Solenoids Curved Solenoid ( 1.4T) Superconducting Curved Transport Solenoids, From Miyake-san

  38. As of 5 years ago

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