Deutsche Tagung f ¨ur Forschung mit ... - SNI-Portal

Methoden und Instrumentierung Poster: Mi., 14:00–16:30 M-P15
From IRIS to HIRES
Franz Demmel 1 , Felix Fernandez-Alonso 1 , Mark Telling 1
1 ISIS Facility, Chilton, OX11 0QX, UK
IRIS was for long time the standard in high resolution spectroscopy combined with a
large dynamic range. After twenty years of success it is time to pursue new horizons in
high resolution back scattering techniques. With the OSIRIS spectrometer an ultimate
aim towards high intensity was already achieved. We propose to extend the techniques
to a high energy resolution spectrometer HIRES with silicon analysers. In contrast
to the back scattering spectrometer at the SNS the primary spectrometer would use
a pulse shaping chopper in combination with a coupled hydrogen moderator. Besides
a higher flux, in comparison with a poisoned moderator, an inherent advantage is the
flexibility in changing the pulse width. Trading resolution against intensity will provide
a powerful and flexible tool in high resolution spectroscopy.