Neutron Guides for Ultracold Neutrons
 Replica tube. Pure Nickel. A polished glass plate was coated with a nickel layer, reinforced with a galvanised nickel layer and removed from the glass. Then rolled to a tube and welded. |  A two meter long replica tube. The roughness of the nickel layer inside is the same as for polished glass: Around 0.5 nm Ra.
The lowest roughness of metal worldwide. |  The replica ucn tubes are positioned in a round vacuum housing. |
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 Glass tubes or electroplated steel tubes are coated with NiMo inside. |
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