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J-PARC, facility for hadron physics, the present status and future

J-PARC, facility for hadron physics, the present status and future. T.Takahashi KEK/J-PARC Center. Contents. Brief Introduction of J-PARC Hadron Facility Results of Commissioning and Physics Programs at each beamline K1.8 /K1.8BR/K1.1BR Beamlines to be constructed in future High-p/K1.1

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J-PARC, facility for hadron physics, the present status and future

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  1. J-PARC, facility for hadron physics,the present status and future T.Takahashi KEK/J-PARC Center

  2. Contents • Brief Introduction of J-PARC • Hadron Facility • Results of Commissioning and Physics Programs at each beamline • K1.8/K1.8BR/K1.1BR • Beamlines to be constructed in future • High-p/K1.1 • Summary

  3. J-PARC at Tokai Village

  4. ＬＩＮＡＣ RCS n ＭＬＦ 50GeV-PS (MR) Hd Bird’s eye photo in Feb. 2008

  5. Under Proposed Existing construction 10000 ESS Materials-Life Sciences PSI 1000 This Project SNS (CW) 3 GeV Power ISIS Nuclear-Particle 100 TRIUMF Physics A) This Project IPNS m 50 GeV 10 Current ( AGS KEK-500MeV FNAL-MI 1 MW Booster CERN-PS 1 SPS 0.1 MW KEK- 12GeV PS U70 0.1 Tevatron 0.01 0.1 1 10 100 1000 10000 Energy (GeV) High-power & multi-purpose accelerator J-PARC = 1MW-class high-power accelerators 10-times beam power of any existing accelerators

  6. High-power & multi-purpose accelerator Muon (m) Pions (p) Target nucleus Neutrino(n) proton(p) neutron(n) Kaons (K) Proton beam (p) 3GeV/50(30)GeV Neutron (n) Particle & Nuclear Physics @ 50(30) GeV Materials & Life Science @3GeV Nuclear Transmutation @600MeV Anti-proton ( p)

  7. Hadron Experimental Hall Hadron Experimental HallPhoto was taken in Oct. 2008

  8. Beam Dump Production Target (T1) Main Ring (MR) Switch Yard (SY) Tunnel MR Tunnnel Slow extraction point Primary Beam Line Hadron Facility Hadron Hall MR SY (～250m) 60m Hadron Hall (56m) Main Ring to Hadron Hall

  9. multi-strangeness hypernuclei Pentaquark Q+ Nuclear & Hadron Physics at Hadron Hall d s u L,X u d double-L Hypernuclear Physics Exotic Hadrons g-ray spectroscopy K− Meson f K1.8 L6LHe KL High-P Nucleus K1.8BR X-ray K1.1 K1.1BR kaonic atom K N Interaction Origin of Hadron Mass kaonic nuclei

  10. Beam lines in Hadron Hall as Kaon Factory (2x1014 ppp, 30GeV-9mA) K1.8BR K1.8 • pmax = 1.1 GeV/c • IK~106 ppp @ 1 GeV/c • pmax = 2.0 GeV/c • IK~106 ppp @ 1.8GeV/c • Double stages • Electrostatic Separators • K-/(p-+m-) ~3.5@1.8GeV/c Ni Target KL K1.1BR • pmax = 0.8 GeV/c • IK~106 ppp @ 0.8GeV/c • pmean ~2 GeV/c • IKL = 1.8x107 ppp • pencil-beam of 7.8msr KL->p0 n nbar rare-decay exp.

  11. K1.8 & SKS SKS K1.8 Beam Spectrometer

  12. K1.8 beam line design value • Pmax=2.0 GeV/c • 46m Length • double stage of Electrostatic Separators • 75kV/cm,6m x 2 • High-resolution beam spectrometer (K1.8BS) • Dp/p =3.3x10-4 (FWHM) 2.0x1014 ppp, Ni Target @1.8GeV/c K- Intensity: 1.4x106 K-/(p-+m-)=3.5 DIFV =4.0mm DMS1=4.5mm DMS2=4.8mm ESS#1 BS(QQDQQ) ESS#2 ESS#1

  13. Kaon Yield at K1.8 w/o fine tune K-@1.8GeV/c K+@1.8GeV/c 2010 Oct.22 2009 Nov.26 1.25x1012 ppp (1kW) Pt Target 6.2x1011 ppp (500W) Ni Target Separators ±200kV IFH ±100mm IFV 0/+4mm Mom ± 60mm MS1 ± 2.35mm MS2 ± 2.5mm Separators ±200kV (±375kV) IFV opening 2.0 mm (4.0mm) MS1 opening 4.7mm(4.5mm) MS2 opening 5.0mm (4.8mm) ← 1/3 of full All charged particles p- K-trigger K- ESS1 OFF ESS2 OFF 12k/spill K-trigger ESS1 ON ESS2 ON 3.6k/spill pbar

  14. Beam & SKS Spectrometer- Performance - SKS from Tsukuba to Tokai for High-resolution Spectroscopy of Hypernuclei, etc.. • Large solid angle of 100msr • High resolution of Dp/p ～0.1%(FWHM) • Small refrigerator system • GM-JT refrigerator x 3 • GM cryocooler for GM-JT shield • GM cryocooler for HiTC current leads 300W refrigerator for Liq-He 2.7Ｔ@ 400A Measured field map at 1.25GeV/c Trouble 1/6 of coil waslost due to earth fault 2.45T@400A Calcurated field map

  15. Approved Experiments at K1.8 • Exotic Hadron/Hadron system • E19 Q+ Search via the H(p-,K-)X • E27 Kaonic nuleus via the D(p+,K+)”ppK-” • Hypernuclei of S=-1 • E10 n-rich L hypernuclei via the (p-,K+) reaction ( 6LH, 9LHe) • E13 g-ray spectroscopy (4LHe, 7LLi, 10LB , 11LB, 19LF ) • E18/E22 weak decays (4LH/4LHe, 12LC ) • Hypernuclei of S=-2 • E05 X-hypernucleus, via the 12C(K-,K+)12XBe • E07 Counter-emulsion hybrid experiment • E03 Measurement of X-Atom X-rays (X-Fe Atom) • Others • E08 Pion double charge exchange • E26 w in nuclei by A(p-,n) reaction and w->p0g

  16. d ー s d u u E19: Search for penta-quark, Q+,via the p+p-→ K-X reaction M.Naruki on Dec.10 The First PHYSICS EXPERIMENT at Hadron Hall. • To confirm the bump-sructure observed • in the previous E522 experiment • with much improved • resolution better than 2MeV/c2 • S/N using Liq-H2target • statistics with high-intensity beam E522 CH2(p-,K-) 1.3 1.4 1.5 1.6 1.7 GeV/c2 Step-1 data taking was successfully finished in this autumn. 7.8x1010p-on 12cm-long Liq-H2 at 1.92GeV/c

  17. Hypernuclear Physics • Baryon-Baryon interaction through the hypernuclear structure • XN and LL interaction • LN interaction in n-rich enviroment • Hadron property in nuclear medium • g-factor of L by B(M1) measurement • Change of nuclear property by additon of hyperon(s) • change of nuclear size etc.. Strangeness LL, X Hypernuclei -2 Z L, S Hypernuclei N-N int. by Lattice QCD N -1 0

  18. K1.8BR CDS detector 3He target

  19. K1.8BR beamline • Pmax=1.1 GeV/c • 31.3m Length • Electrostatic Separator (50kV/cm,6m) 2.0x1014 ppp, Ni target K- intensity 7.5x105 @ 1.1GeV/c 1.0x105 @ 0.8GeV/c 8.4x103 @ 0.6GeV/c K-@0.75GeV/c Yield (Measured ) 1.5x1012 ppp, 40kV/cm (design)

  20. Approved Experiments at K1.8BR • Kaonic nuclei, Kbar-N interaction • E17 Measurement of Kaonic 3He 3d -> 2p X-rays • E15 Kaon deeply bound state, “ppK-” via the 3He(K-,n)X and X -> (Lp) -> ppp- • P28 ( 3He(K-,p/n)X ) • E31 Hyperon resonance below KN threshold via the D(K-,n) reaction

  21. E17:Strong-interaction Shift and Width of Kaonic Helium 3 Slide by Dr. M. Iio T.Hashimoto on Dec.10 Atomic orbits of Kaonic Helium 3 3d 3d 2p X-rays DE2p: Shift G2p: Width (Strong-interaction) 2p absorption (Coulomb-only) 2p Nucleus Last orbit of Kaonic atoms is sensitive to K--nucleus strong-interaction.

  22. K- 3He K-pp n Reaction + + L Decay p- p p NC 15 m M. iio, Slide for PANIC08 E15: Next to E17 Y.Sada on Dec.10 Missing mass spectroscopy K-ppsearch with TOF measurement of neutron Decay particle measurement K-ppsearch with exclusive decay particle measurement K-pp state is investigated in K-+3He -> Lp + n well distinguished final state. L is always attributed to K- in the initial state.

  23. K1.1BR

  24. Actual layout of K1.1BR D2 Q3 Q4 ESS Q5 Q6 D3 Q1 Q2 HFOC Q7 Q8 IFX IFY SX1 SX2 T1 MS D1 • FF Proton beam • Shorter length (2.0 m) of ESS instead of optics design (2.5 m) - old K5 ESS is reused - • Smaller D3 bending angle (40°) than beam optics (45°) - performance limit of the recycled D3 magnet - • Longer Q8-FF distance (3.3 m) than the beam optics (1.5 m) - a thick iron wall necessary for radiation safety -

  25. Beam envelop (K1.1BR) Beam Analyzer ESS D3 Q7 Q8 L = 21.5 m @ 1.0 GeV/c • W = 3.3 msr %dp/p @ HFOC = ± 6 mm; IK+ = 5.4 x 104 /s @5kW • = 5.0 msr %dp/p @ HFOC = ±20 mm; IK+ = 8.2 x 104 /s @5kW (with Pt target)

  26. Measured K+ Yield & Separation @ 0.8GeV/c • 4.5x1012 ppp (3.6kW) • Normal Vertical Slit Opening Test beamline for test exp. (for a while) TREK (Time-reversal Exp.) (future)

  27. Other (Approved) Experiments • Meson in nuclei, In-medium modification of mesons • E16 Chiral symmetry of QCD (f in nuclei) @ High-P beamline • E29 f-meson bound state via the A(pbar,f)X @ K1.1 beamline • (deferred status) • P04 High-mass dimuon production @ Primary (High-P) beamline

  28. Beam lines in Hadron Hall K1.8 KL High-P K1.8BR K1.1 K1.1BR

  29. R.Muto et al,PRL98 (07)042501 E16: In-medium mass modification of vector meson electron-pair spectrometer KEK-E325 (1020) • collect 104 ~105 ee for each target • 10~100 times as large as the previous E325 data • velocity dependence • target (size) dependence

  30. Location of E16 : High-p beam line SM1: branched by 5° 2% beam loss is allowed Vertical Bend 3.9° 5.8°x3 Already the spectrometer magnet has been moved to Hadron Hall. Budget being requested. R&D for the actual beam line is underway. Experimental Area beam dump Beam dump and shields are for 1010 protons/s 30

  31. Summary • J-PARC has started its operational era! • 4 beam lines, K1.8, K1.8BR, KL, and K1.1BR, are completed. • K1.8 & SKS: Hypernuclear Physics Experiments E19 has finished the step-1 data-taking. • K1.8BR: E17/E15 are being started. • KL: K rare decay experiment (KL->p0nnbar) started its engineering run. • K1.1BR: Commissioning and some test exp. started. • We are requesting to construct K1.1 and High-p lines

  32. People at J-PARC Hadron Experimental Hall Graduate Students, Professors, Researchers, Engineers…, all over the world 2009.1.27 First Beam to Hd Hall 2009.10.22 First beam to K1.8 KOTO (E15) Experimental Team (KＬ Rare Decay Search) Start up of K1.8 Counting Hat Line marking at K1.8 area New comers and a senior Background survey before construction of KL! Front end circuits at K1.8BR My beautiful TOF counters! Midnight in KL Counting Hat Our TOF wall is ready!

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