title: Note: a new design for a low-temperature high-intensity helium beam source.
abstract: A high-intensity supersonic beam source is a key component of any atom scattering instrument, affecting the sensitivity and energy resolution of the experiment. We present a new design for a source which can operate at temperatures as low as 11.8 K, corresponding to a beam energy of 2.5 meV. The new source improves the resolution of the Cambridge helium spin-echo spectrometer by a factor of 5.5, thus extending the accessible timescales into the nanosecond range. We describe the design of the new source and discuss experiments characterizing its performance. Spin-echo measurements of benzene/Cu(100) illustrate its merit in the study of a typical slow-moving molecular adsorbate species.
authors: Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom. bajl2@cam.ac.uk
authors: B A J
authors: BA
authors: Lechner
authors: H
authors: H
authors: Hedgeland
authors: W
authors: W
authors: Allison
authors: J
authors: J
authors: Ellis
authors: A P
authors: AP
authors: Jardine