Multi-chopper time-of-flight spectrometers for spallation sources

Some essential ingredients of a multi-chopper time-of-flight (MTOF) spectro meter, recently proposed for the spallation source project AUSTRON, will be described briefly. A continuous variable energy resolution (1 mu eV to 10 meV), and a large dynamic range (1 mu eV to 100 meV), are among its outstan ding features. This spectrometer makes full use of the pulsed source peak f lux. Therefore, and because of an improved design, high resolution will be available at high intensity: for any given resolution the total intensity a t the detectors, when placed at AUSTRON, will be larger by three orders of magnitude than the total intensity of the best presently existing instrumen t of this type (NEAT) at a steady-state source. (C) 2000 Elsevier Science B .V. All rights reserved.