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UCN optics, polarization foils and spinflipper for the munich nEDM approach

UCN optics, polarization foils and spinflipper for the munich nEDM approach. Thorsten Lauer. Demands in UCN components. UCN guides. UCN storage cell. UCN polarizer. UCN spin guiding. UCN detectors. 2. T.Lauer – EDM workshop Oak Ridge Oct.2012. UCN beam positions at FRM-2.

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UCN optics, polarization foils and spinflipper for the munich nEDM approach

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  1. UCN optics, polarization foils and spinflipper for the munich nEDM approach Thorsten Lauer

  2. Demands in UCN components UCN guides UCN storage cell UCN polarizer UCN spin guiding UCN detectors 2 T.Lauer – EDM workshop Oak Ridge Oct.2012

  3. UCN beam positionsat FRM-2 Neutron life-time experiment Halle Ost S-bend in UCN guide SC spin filter EDM SR6 exit UCN source Biological shield Qbounce Phase space transformer Reactor wall 28 m 3 T.Lauer – EDM workshop Oak Ridge Oct.2012

  4. UCN optics infront of the EDM EDM spectrometer is at the same floor level as the source SC magnet + spin flipper 4 T.Lauer – EDM workshop Oak Ridge Oct.2012

  5. Manipulating the UCN spectrum for nEDM: B0 ≈ 1.5 T RF frequency ≈ 40 MHz to do: - building a spinflipper (birdcage resonator,…..?) - Ordering superconducting magnet (length min. 600 mm, warm bore of 300 mm) 5 T.Lauer – EDM workshop Oak Ridge Oct.2012

  6. Inside the EDM UCN switch UCN bend sections UCN guides Polarisation foil in front of the detector 6 T.Lauer – EDM workshop Oak Ridge Oct.2012

  7. UCN guides • New sputtering facility for UCN guides: • Coatings of NiMo,Cu, Ti, supermirrors… inside tubes • max. guide length 1.8 m • inner diameters from 50 to 150 mm 3.6m long vacuum chamber will arrive in October Transport system is ready 7 T.Lauer – EDM workshop Oak Ridge Oct.2012

  8. UCN guides Transmission was measured to be 97.6% per meter (similar to replica!) 8 T.Lauer – EDM workshop Oak Ridge Oct.2012

  9. UCN bendsections (1-3) NiMo coated glass bends (300,450) (4) Stainless steel 450 selfmade bend sections: 92% transmission 9 T.Lauer – EDM workshop Oak Ridge Oct.2012

  10. UCN guides Supermirror with m = 1.5 (360 neV): 15 double layers of NiMo and Ti Bild VF = 360 neV measured What storage times can be expected? We will hopefully investigate this next year at ILL 10 T.Lauer – EDM workshop Oak Ridge Oct.2012

  11. UCN Switch Design for new switch will be similar (known technique) 11 T.Lauer – EDM workshop Oak Ridge Oct.2012

  12. Development of UCN polarizers Sputtering facility for Planar substrates : Substrat size : 700 x 300 mm² 3 magnetrons working in DC, RF or pulsed DC mode Coating homogeneity < 0.5% Bild große anlage - supermirrors - polarizers - further neutron optics - …. 12 T.Lauer – EDM workshop Oak Ridge Oct.2012

  13. Development of UCN polarizers Polarisation with single iron layers on Al - foils 96.0+/- 2.5% (magnetisation field 10mT!) 13 T.Lauer – EDM workshop Oak Ridge Oct.2012

  14. Development of UCN polarizers Magnetisation field 10mT 150nm thick iron layer -> high transmission Properties of the iron layer strongly depend on the production parameters 14 T.Lauer – EDM workshop Oak Ridge Oct.2012

  15. A UCN superpolarizer 99.5 +/- 1.0% 10 double layers Fe/Si on Si-wafer or Al-foil 15 T.Lauer – EDM workshop Oak Ridge Oct.2012

  16. Spin Gymnastics Mu-metal shield solenoid SC & SF Cosine coil Spin transport system is under preperation Should be tested at beginning of 2013 Cascade-U detector 16 T.Lauer – EDM workshop Oak Ridge Oct.2012

  17. Outlook • Coating techniques and know-how exists • UCN guides can be produced quite soon in new facility • UCN polarizer foils can be produced • Development of a UCN detector for simultaneous spin detection in collaboration with Heidelberg • Design of a working UCN switch exists and will be adapted • UCN-shutter and -spin transport design is on the way • We have to take care about the storage cells 17 T.Lauer – EDM workshop Oak Ridge Oct.2012

  18. Thank you for your attention I. Altarev, V. Andreev, D. Beck, S. Chesnevskaya, T. Chupp, M. Daimer, P. Fierlinger, A. Frei, E. Gutsmiedl, A. Himpsl, F. Kuchler, T. Lauer, P. Link, T. Lins, M. Marino, J. McAndrew, S. Paul, G. Petzoldt, A. Pichlmaier, J. Rothe, S. Sharma, C. Schneider, R. Schönberger, S. Seidel, M. Steinmaßl, R. Stoepler, T. Stolz, S. Stuiber, M. Sturm, B. Taubenheim, R. Thiele, J. Weber, D. Wurm, T. Zechlau 18 T.Lauer – EDM workshop Oak Ridge Oct.2012

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