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Status of E14

Status of E14. G.Y.Lim IPNS, KEK. E14 Experiment. Step-by-step approach to precise measurement of Br( K L  p 0 nn ) KEK-PS E391a J-PARC E14 (Step-1) J-PARC E14 (Step-2). KL beam line sharing T1 target. Updated E391a detector. Large parameter space for NP. In the Step-1,.

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Status of E14

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  1. Status of E14 G.Y.Lim IPNS, KEK

  2. E14 Experiment Step-by-step approach to precise measurement of Br(KL p0nn) • KEK-PS E391a • J-PARC E14 (Step-1) • J-PARC E14 (Step-2) KL beam line sharing T1 target Updated E391a detector.

  3. Large parameter space for NP

  4. In the Step-1, • Beam line with common target at the new facility. • Finer segmented longer calorimeter. • Neutron insensitive beam hole photon veto. • To fit the high intensity environment. • To establish a way to reject backgrounds and properly estimate their level. • To make a realistic plan for the Step-2.

  5. Beam line

  6. KL Beam line

  7. Original Plan for Beamlines S. Nagamiya 4th J-PARC PAC

  8. S. Nagamiya 4th J-PARC PAC

  9. Characteristic of KL line • Collimation with multi-stage thick collimator. • Different situation compared to E391a. • Finite size of target image. • Start collimator far from production target. • Parallel incident neutron. • Affected by various materials upstream. • Beam Sharing with K1.1. • Longer beam line : smaller solid angle • Larger extraction angle: better KL/n ratio, soft neutron. • E391a results shows reliability of M.C. study A trial for E14

  10. The effect of upstream materials T1 target Pb absorber Start KL collimator Scattering points to produce halo neutron Halo neutrons will be increase as a factor of 1.6 with current optimized K1.1 elements.

  11. To avoid upstream scattering Wide range of neutron generation at Cu. Cu collimator (additional possible source) Guide line for trimming. Beam size V.S. Halo production.

  12. Square beam • To adapt target image. • Beam hole of the calorimeter is square. (easy to construct) • To increase KL yield. • To decrease halo neutrons. • We have to check • Large effective radius (B.G. level). • Effects of primary beam stability.

  13. KL yield • Depends on MC package • G4 / G3 / FLUKA  We use G4 result as a default  FLUKA mayreproduce dataaccording to production experiment (BNL-E802)

  14. Detector up-grades

  15. E14 Detector

  16. Calorimeter 2.5 X 2.5 X 50 cm3 5.0 X 5.0 X 50 cm3 7.0 X 7.0 X 30 cm3

  17. No shower leakage E391 Run-2 Result We can suppress the CC02 event to extend into signal region by correct energy measurement and better position resolution.

  18. Shower shape analysis Angle Measurement Fusion rejection E391a E14 E391a

  19. Status of preparation • CsI transfer • Procedure established • 1stshipping (~300) in Mar. 2008 • Readout R&D • 125MHz FADC • Beam test in Dec 2007 • Cockcroft-Walton PMT base • 1st prototype in Jan 2008

  20. Rehearsal of CsI disassembling • At FNAL-KTeV hall in Dec 2007

  21. And CsI packing

  22. Test of CsI Readout • Beam test at FNAL in Dec 2007 • Using M-Test line • 125MHz FADC • 16ch VME module • FPGA control Debugging Synchronizationwith usual DAQ system

  23. Test of CsI Readout The readout worked successfully.

  24. Beam Hole Photon Veto • Insensitive to neutrons: 0.2%@2GeV/c • 10-3 photon detection inefficiency for Eg > 1 GeV • False hit rate : 2MHz • Proven by prototype at the beam test

  25. MB Upgrade • Extra 5Xo for better efficiency. • Studying inner extra module. • - Low energy photon. • - Inner module with better visible ratio.

  26. Schedule digest

  27. Summary • E14 aims at search for the KLp0nn with SM sensitivity. • Beam line design is under studying. • Fabrication of beam line elements in FY2008. • Beam line construction and survey in FY2009. • CsI Preparation • Prototype electronics was tested at FNAL on Dec. 2007. • 1st transferring process is being done on Feb. and March, 2008. • Assembling will be done in 2009. • Back ground estimation is up-dating. • Continuously debugging and developing GEANT4-base M.C. • Aiming at engineering run in 2010.

  28. Back-ups

  29. Comparison among three different configurations. • ‘KL line alone’ reduces N_halo/N_KL as factor of 3.3 compared to that of ‘original K1.1’. • ‘Modified K1.1’ recovers N_KL, however the number of halo neutrons is • still larger as factor 1.6 compared to that of ‘KL line alone’. • - We need to check feasibility to make large holes (r=2.5cm) in K1.1 magnets.

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