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

transcript

Thorsten Lauer

Demands in UCN components

T.Lauer – EDM workshop Oak Ridge Oct.2012

UCN guides

UCN polarizer

UCN detectors

UCN storage cell

UCN spin guiding

SR6 exit

S-bend in UCN guide

UCN source

Biological shield

Neutron life-time experiment

Qbounce Reactor wall

Halle Ost

Phase space transformer

SC spin filter

UCN beam positions at FRM-2

T.Lauer – EDM workshop Oak Ridge Oct.2012

UCN optics infront of the EDM

SC magnet + spin flipper

4T.Lauer – EDM workshop Oak Ridge Oct.2012

EDM spectrometer is at the same floor level as the source

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)

TneVBBV /3,600

Inside the EDM

UCN guides

UCN switch

Polarisation foil in front of the detector

UCN bend sections

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

UCN guides

Transmission was measured to be 97.6% per meter (similar to replica!)

UCN bend sections

(1-3) NiMo coated glass bends (300,450)(4) Stainless steel 450

selfmade bend sections:

92% transmission

UCN guides

Supermirror with m = 1.5 (360 neV): 15 double layers of NiMo and Ti

VF = 360 neV measured

What storage times can be expected?

We will hopefully investigate this next year at ILL

UCN Switch

Design for new switch will be similar (known technique)

Development of UCN polarizers

Bild große anlage

- supermirrors- polarizers- further neutron optics- ….

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%

Polarisation with single iron layers on Al - foils96.0+/- 2.5% (magnetisation field 10mT!)

Properties of the iron layer strongly depend on the production parameters

Magnetisation field 10mT

150nm thick iron layer

-> high transmission

A UCN superpolarizer

99.5 +/- 1.0%

10 double layers Fe/Si on Si-wafer or Al-foil

Spin Gymnastics

SC & SF solenoid

Cosine coil

Mu-metal shield

Cascade-U detector

Spin transport system is under preperation

Should be tested at beginning of 2013

Outlook

• Coating techniques and know-how exists

• UCN guides can be produced quite soon in new facility

• UCN polarizer foils can be producedDevelopment 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

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

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

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