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Simulation of a suite of generic long-pulse neutron instruments to optimize the time structure of the European Spallation Source

Lefmann, Kim ; Kleno, Kaspar H. ; Birk, Jonas Okkels ; Hansen, Britt R. ; Holm, Sonja L. ; Knudsen, Erik ; Lieutenant, Klaus ; von Moos, Lars ; Sales, Morten and Willendrup, Peter K. , et al. (2013) In Review of Scientific Instruments 84(5).
Abstract
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... (More)
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. (C) 2013 AIP Publishing LLC. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Review of Scientific Instruments
volume
84
issue
5
article number
055106
publisher
American Institute of Physics (AIP)
external identifiers
  • wos:000319999300064
  • scopus:84878945479
  • pmid:23742588
ISSN
1089-7623
DOI
10.1063/1.4803167
language
English
LU publication?
yes
id
561f20d7-91fb-4a1b-ba13-343c020e81ab (old id 3930360)
date added to LUP
2016-04-01 13:21:12
date last changed
2020-11-22 06:08:27
@article{561f20d7-91fb-4a1b-ba13-343c020e81ab,
  abstract     = {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. (C) 2013 AIP Publishing LLC.},
  author       = {Lefmann, Kim and Kleno, Kaspar H. and Birk, Jonas Okkels and Hansen, Britt R. and Holm, Sonja L. and Knudsen, Erik and Lieutenant, Klaus and von Moos, Lars and Sales, Morten and Willendrup, Peter K. and Andersen, Ken},
  issn         = {1089-7623},
  language     = {eng},
  number       = {5},
  publisher    = {American Institute of Physics (AIP)},
  series       = {Review of Scientific Instruments},
  title        = {Simulation of a suite of generic long-pulse neutron instruments to optimize the time structure of the European Spallation Source},
  url          = {http://dx.doi.org/10.1063/1.4803167},
  doi          = {10.1063/1.4803167},
  volume       = {84},
  year         = {2013},
}