2014-12-04A20_2014 Chopper EXED (Helmholtz-Zentrum-Berlin für Materialien und Energie GmbH)
The EXED inelastic chopper system will consist of two discs made of carbon fiber, mounted in a single housing sharing a common vacuum with neutron guide system. Each disc has to be mounted on a rotor axis of phase stabilized (0.01° on a range of 360°) motor and supported by conventional (hybrid) ball bearings. Maximum rotation speed of 250 Hz (15000 rpm) should be achieved for each disc. The discs should be able to park in a specified open or closed position. The bearings lifetime for the chopper running …
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