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@ARTICLE{Houston:844558,
author = {Houston, Judith Elizabeth and Brandl, Georg and Drochner,
Matthias and Kemmerling, Günter and Engels, Ralf and
Papagiannopoulos, Aristeidis and Sarter, Mona and Stadler,
Andreas and Radulescu, Aurel},
title = {{T}he high-intensity option of the {SANS} diffractometer
{KWS}-2 at {JCNS} – characterization and performance of
the new multi-megahertz detection system},
journal = {Journal of applied crystallography},
volume = {51},
number = {2},
issn = {0021-8898},
address = {Copenhagen},
publisher = {Munksgaard},
reportid = {FZJ-2018-01965},
pages = {323 - 336},
year = {2018},
abstract = {A new detection system based on an array of 3He tubes and
innovative fast detection electronics has been installed on
the high-intensity small-angle neutron scattering (SANS)
diffractometer KWS-2 operated by the Jülich Centre for
Neutron Science (JCNS) at the Heinz Meier-Leibnitz Zentrum
in Garching, Germany. The new detection system is composed
of 18 eight-pack modules of 3He tubes that work
independently of one another (each unit has its own
processor and electronics). To improve the read-out
characteristics and reduce the noise, the detection
electronics are mounted in a closed case on the rear of the
3He tubes' frame. The tubes' efficiency is about $85\%$ (for
λ = 5 Å) and the resolution slightly better than 8 mm.
The new detection system is characterized by a dead-time
constant of 3.3 µs per tube and an overall count rate as
high as 6 MHz at $10\%$ dead-time loss. Compared with the
old detector this is an improvement by a factor of 60. The
much higher count rate will shorten the measurement times
and thus increase the number of experiments possible in a
given time period by the optimal use of the high flux of up
to 2 × 108 n cm−2 s−1 at the sample position.
Combined with the event-mode operation capability, this will
enable new scientific opportunities in the field of
structural investigations of small soft-matter and
biological systems. The implementation of the detector in
the high-intensity concept on KWS-2, its characterization
and its performance based on test experiments are reported
in this paper.},
cin = {Neutronenstreuung ; JCNS-1 / JCNS-2 / JCNS-FRM-II},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29657566},
UT = {WOS:000429090100010},
doi = {10.1107/S1600576718004132},
url = {https://juser.fz-juelich.de/record/844558},
}