Speaker
Description
The Inelastic Neutron Time of Flight Instrument Pelican began operating in 2014. The instrument has a high intensity and high resolution master fermi chopper. Due to space constraints and shielding designs the time to change between the choppers is over half a day. As a result this change is very rarely undertaken.
A new optical bench design is underway in which a translation system will allow an automatic change in master fermi chopper in less than 10 minutes. At the same time there is a significant improvement of the alignment method planned and the addition of a new polariser.
Shielding optimisation has been undertaken with nuclear analysis based on confirming current doses vs those calculated in MCNP. This information was fed back to provide a more modular and compact shielding arrangement.
Detailed laser scanning on the instrument and dance floor yielded information on the areas of the instrument which were not stiff resulting in beam time wasted undertaking a final alignment with neutrons. As the instrument is heavily over subscribed this time saved is very beneficial.
Key Words
Shielding, Fermi Choppers, Alignment, Translation and Control Systems
| Other | Choppers |
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