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HES Status Report Jun ‘07

HES Status Report Jun ‘07. contents HES Resolution Study EDC EDC1, HDC EDC2 Position Study others. Try to improve HES resolution. Apply Kato formula to EQ1 and EQ2 Use uniform field map as ED Use randomized magnetic field Change B.M order (now using 8 th B.M) Tilt = 0 deg setup.

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HES Status Report Jun ‘07

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  1. HES Status ReportJun ‘07 contents HES Resolution Study EDC EDC1, HDC EDC2 Position Study others

  2. Try to improve HES resolution • Apply Kato formula to EQ1 and EQ2 • Use uniform field map as ED • Use randomized magnetic field • Change B.M order (now using 8th B.M) • Tilt = 0 deg setup Everything is Not effective!

  3. Resolution : Comparing w/ HKS w/o Fujii’s Method, dx=80mm, dy=280mm HES Simulation HKS Simulation Angular resolution is important for QQD system!? if true … EDC2 plays quite important role for HES resolution (only EDC1, angular resolution is not good enough)

  4. EDC1 Position Study EQ1, EQ2 is same strength Momentum distribution Beam Profile @ z=151cm EDC1 Sensitive area GeV/c

  5. EDC2 Position Study d Sensitive Area • EDC1 … 100(w)*12(H)*32(T) • EDC2 … 120(w)*30(H)*2(T) 100cm 120cm 3”=7.6cm 47.8cm HDC EDC sxEDC = 80mm syEDC = 280mm sxEDC = 150mm(?) syEDC = 150mm(?) FP = 135cm from ED

  6. Geant4 Update • Include EQ1, EQ2 vacuum chamber • Correct the distance between EQ2 and ED (60cm to 80cm) • Improve Primary Generation file selector • EDC include/not include selector in input file • Use CVS?

  7. Sieve Slit Study 1 • Placed at 30cm from EQ1 entrance • No Material, just a Virtual Detector • hole radius = 2mm, interval = 2cm

  8. Sieve Slit Study 2

  9. ED Magnetic Field Changed! Bdl : 3.54→3.08 ?? Bdl seems to depend on the model meshing Now under investigation …

  10. Next to do • Calculate New FoM, including Collimator • Sieve Slit Study • Resolution improvement • Beam intensity, vp yield • Separation efficiency, Angular (Momentum?) Resolution • Include HDC • Field MAP upgrade

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