Journal article
Simulation of a suite of generic long-pulse neutron instruments to optimize the time structure of the European Spallation Source
University of Copenhagen1
Swiss Federal Institute of Technology Lausanne2
Department of Physics, Technical University of Denmark3
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark4
European Spallation Source ERIC5
Institute for Energy Technology6
Department of Energy Conversion and Storage, Technical University of Denmark7
Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark8
We here describe the result of simulations of 15 generic neutron instruments for the long-pulsed European Spallation Source. All instruments have been simulated for 20 different settings of the source time structure, corresponding to pulse lengths between 1 ms and 2 ms; and repetition frequencies between 10 Hz and 25 Hz.
The relative change in performance with time structure is given for each instrument, and an unweighted average is calculated. The performance of the instrument suite is proportional to (a) the peak flux and (b) the duty cycle to a power of approximately 0.3. This information is an important input to determining the best accelerator parameters.
In addition, we find that in our simple guide systems, most neutrons reaching the sample originate from the central 3-5 cm of the moderator. This result can be used as an input in later optimization of the moderator design. We discuss the relevance and validity of defining a single figure-of-merit for a full facility and compare with evaluations of the individual instrument classes.
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2013 |
| Pages: | 055106 |
| ISSN: | 10897623 and 00346748 |
| Types: | Journal article |
| DOI: | 10.1063/1.4803167 |
| ORCIDs: | 0000-0003-4282-756X , 0000-0002-7128-4149 , 0000-0003-4118-5702 and Bergbäck Knudsen, Erik |
