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UCN Report

UCN Report. Nov1-Nov9@RCNP H.Otono, H.Oide, T.Yoshioka. Physics w/ UCN. Neutron Electric Dipole Moment  T-violation Gravity extra dimension Beta decay V ud in Kobayashi Masukawa Matrix Neutron-AntiNeutron Oscillation beyond GUT (Δ|B-L|=0 ) and

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UCN Report

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  1. UCN Report Nov1-Nov9@RCNP H.Otono, H.Oide, T.Yoshioka

  2. Physics w/ UCN • Neutron Electric Dipole Moment T-violation • Gravity extra dimension • Beta decay Vud in Kobayashi Masukawa Matrix • Neutron-AntiNeutron Oscillation beyond GUT (Δ|B-L|=0 ) and neutron as a target, application for surface physics,…

  3. UCN Production System

  4. UCN Production System • 400MeV proton beam to Pb target • Moderation by 300K and 20K heavy water • Cooling by super-fluid Helium (Type-Ⅱ) • Transfer through stainless guide • Detector : single wire chamber Velocity < 7m/s Energy < 300neV (gravity potential 102nev/m) Total reflection

  5. UCN Production System

  6. Cooling Strategy Normal fluid helium4 　　　↓ pumping Fluid helium Normal fluid helium3 pumping Fluid helium Cooling Isopure helium4 Super-fluid helium Cooling

  7. What’s Important • Temperature at each part • Helium flow in cooling pipe • He level in each pot These values are recorded manually, so far. We have been successfully introduced an online temperature monitor system using labview.

  8. Live Video via WWW

  9. Next job ~UCN detector n + 3He p + Tr

  10. Sectional Drawing

  11. Task • Understanding in detail • Suitable voltage • Locality • Stability • Absolute efficiency (in FUTURE) • Used tool • Three type Disks (Sorry! No Photo!) Hole

  12. Setup

  13. Suitable voltage 1000V at last beam test

  14. Typical ADC Distribution FWHM~6.7%

  15. Locality of UCN detector G F D Wire direction C B A E

  16. Pulse Height Spectrum

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