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

TY - JOUR

T1 - Simulation of a suite of generic long-pulse neutron instruments to optimize the time structure of the European Spallation Source

AU - Lefmann, Kim

AU - Klenø, Kaspar Hewitt

AU - Birk, Jonas Okkels

AU - Hansen, Britt Rosendahl

AU - Holm, Sonja Lindahl

AU - Knudsen, Erik

AU - Lieutenant, Klaus

AU - von Moos, Lars

AU - Sales, Morten

AU - Willendrup, Peter Kjær

AU - Andersen, Ken H.

PY - 2013/5

Y1 - 2013/5

N2 - 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.

AB - 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.

U2 - 10.1063/1.4803167

DO - 10.1063/1.4803167

M3 - Journal article

C2 - 23742588

SN - 0034-6748

VL - 84

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 5

M1 - 055106

ER -