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

被引：16

作者：

Lefmann, Kim ^{[1
,2
,3
]}

Kleno, Kaspar H. ^{[1
,2
,3
]}

Birk, Jonas Okkels ^{[1
,2
,3
,4
]}

Hansen, Britt R. ^{[5
,6
]}

Holm, Sonja L. ^{[1
,2
,3
]}

Knudsen, Erik ^{[5
,6
]}

Lieutenant, Klaus ^{[7
,8
,9
]}

von Moos, Lars ^{[6
,10
,11
]}

Sales, Morten ^{[1
,2
,3
]}

Willendrup, Peter K. ^{[5
,6
]}

Andersen, Ken H. ^{[12
]}

机构：

[1] Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, DK-2100 Copenhagen O, Denmark

[2] Univ Copenhagen, Niels Bohr Inst, eSci Ctr, DK-2100 Copenhagen O, Denmark

[3] Danish Workpackage ESS Design Update Phase, DK-2100 Copenhagen O, Denmark

[4] Ecole Polytech Fed Lausanne, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland

[5] Tech Univ Denmark, Inst Phys, DK-2800 Lyngby, Denmark

[6] Danish Workpackage ESS Design Update Phase, DK-2800 Lyngby, Denmark

[7] Inst Energy Technol, N-2007 Kjeller, Norway

[8] Helmholtz Ctr Energy & Mat, D-14109 Berlin, Germany

[9] German Work Package ESS Design Update, D-14109 Berlin, Germany

[10] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark

[11] Tech Univ Denmark, Inst Energy Convers, DK-4000 Roskilde, Denmark

[12] European Spallat Source ESS AB, S-22100 Lund, Sweden

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2013年 / 84卷 / 05期

关键词：

Moderators;

D O I：

10.1063/1.4803167

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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.

引用

页数：9

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