Aluminum is commonly used as vacuum separation foil in neutron guides and detectors. Due to its low surface potential neutrons with angular velocities down to 3m/s are passing the foil. However, according to Steyerl [1] neutron transmission is also affected by the surface roughness of the passed foil. The transmission decreases towards slow neutrons with […]
At setups which are on one side and at room temperature and on the other end cooled down by a cry head to almost zero kelvin (-273°C) a huge thermal gradient is given. Therefore, thermal contraction of the connecting part made of steel or any other material might lead high shear stresses at the cold […]
In this blog our project on designing and stress simulation of a ultra high vacuum chamber for 3D sputtering with outer dimensions of 1800x600x600mm will be described shortly
A commonly used material for UCN guiding is stainless steel ISO 1.4401 and 1.4404, due to its non magnetic, high stress resistance, availability and quite high neutron optical potential. Reducing losses and to minimize non-specular reflection they are highly polished to very low roughness far below the guided neutrons wavelength reaching a average transimission of […]
With ultracold neutrons (UCN) many questions in fundamental physics are investigated. To obtain precise answers at high confidence level within realistic measurement times, high UCN densities are needed. Highest UCN densities are achieved using thermal sources, whereas highest UCN densities are nowadays achieved in superthermal sources. While thermal sources are already almost at their limit, […]
I have designed the neutron switch, figure (a, c), working under ultra high vacuum (UHV) conditions, to achieve high neutron densities at UCN experiments at low noise. With my design a transmission of up to 95% is achievable for a guide diameter of 50mm with an 60° angular deflection and 70mm radius (see figure (b). Whereas, by […]
Alt? vielleicht – In die Jahre gekommen NEIN! Die Kombination unserer FP2 A CNC Färse mit modernsten CAM system ermöglicht es modernste Materialbearbeitungsverfahren wie 3D Konturen und Wirbelfräsen anzuwenden. Wobei sie im vergleich zu neueren Maschinen es immer noch ermöglicht -wenn nötig- schnell konventionell zu Färsen.