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HLab Meeting 2006 8/28

HLab Meeting 2006 8/28. K - beam momentum. K - + n -> L + p -. Both spin-flip and nonflip states should be produced. p K = 1.5 GeV/c : K1.8 + SKS. SMF: Muon filter to suppress K - -> m - n. SDC3,4: Large-size (2.0mx0.8m), fine cell (1~2cm). To be constructed.

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HLab Meeting 2006 8/28

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  1. HLab Meeting20068/28

  2. K- beam momentum K- + n -> L + p- Both spin-flip and nonflip states should be produced. pK = 1.5 GeV/c : K1.8 + SKS

  3. SMF: Muon filter to suppress K- ->m-n SDC3,4: Large-size (2.0mx0.8m), fine cell (1~2cm) To be constructed SP0: Veto counters to reject K- -> p-p0 Beam and Setup • Spectrometer: SKS (modified) Dp ~ 4 MeV (FWHM) W ~ 110 msr p- • Hyperball-J e ~ 7% at 1 MeV K- 1.5 GeV/c • Beamline: K1.8 0.5x106 K-/spill at 1.5 GeV/c (9mA) K/p >> 1 K1.8

  4. Beam hits Drift chambers • Low momentum transfer ～0.1[GeV/c] • Beam K- 1.5[GeV/c] • Scattered particle π- ～1.4[GeV/c] • Beam rate ～500k/spill (700kHz) →580 kHz/wire @ DC sell size 20mm (w/Beam distributionσx=19.8[mm], S=(2π)1/2Aσ)

  5. Beam Scatterer (SBS) To scatter the beam by Multiple scattering!

  6. Property of SBS • Large radiation length (X0) • Pb :0.56 [cm] →1.77°→ 92kHz • W :0.35[cm] → 2.28°→ 72kHz • Pt :0.31[cm] → 2.45°→ 64kHz (1.5GeV/c K-, 5cm thickness, 200cm flight path)

  7. Simulation Straight beam K- 1.5[GeV/c] DC Cell size 20[mm] SBS 5[cm]

  8. DC rate Simulation: 700kHz→98kHz→76kHz (Calculation: 700kHz→92kHz→72kHz) ・w/o particle decay, Hadronic interaction

  9. Position dependency Distribution: Gaussian 200cm→300cm

  10. DC rate Decreasing ～１8(0.82), 15(0.85), 11(0.89)%

  11. Thickness 50mm→100mm Decreasing ～29(0.71), 28(0.72)% ⇔ 0.71

  12. 目標 • 50kHz/wire @ cell size 20mm (Pb 5cm, Flight path 200cm → 92kHz) (W 5cm, Flight path 200cm → 72kHz) • This value is consistent with simulation (98, 76kHz). W/o particle decay (0.67), Hadronic interaction, Beam distribution →Decrease DC rate

  13. Simulation Plan • Beam distribution (u=dx/dz, v=dydz) • π-contamination (pi/K=0.2) • Hadronic interaction →To confirm DC rate • Background study

  14. 値段 SBS 5cmX5cmX5cm • Pb : ～0円 (その辺のブロック) • W : 10～20万円 • Pt : 4500円/g (d=21.1g/cm3) • Rate Pb=1 → W=0.78, Pt=0.72

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