Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	The high-intensity option of the SANS diffractometer KWS-2 at JCNS – characterization and performance of the new multi-megahertz detection system
Δημιουργός/Συγγραφέας:	Houston J.E. Brandl G. Drochner M. Kemmerling G. Engels R. [EL] Παπαγιαννόπουλος, Αριστείδης[EN] Papagiannopoulos, Aristeidis Sarter M. Stadler A. Radulescu A.
Εκδότης:	Wiley-Blackwell
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	0021-8898
DOI:	10.1107/S1600576718004132
Περίληψη:	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.
Τίτλος πηγής δημοσίευσης:	Journal of Applied Crystallography
Τόμος/Κεφάλαιο:	51
Τεύχος:	2
Σελίδες:	323-336
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	event-mode capability mesoscale structures neutron detectors small-angle neutron scattering (SANS)
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© Judith Elizabeth Houston et al. 2018
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Hybrid Gold, Green
Σημειώσεις:	Bundesministerium für Bildung und Forschung, BMBF: 05K16PA1 Funding for this research was provided by Bundesministerium für Bildung und Forschung (award No. 05K16PA1 to AS and MS). MS also acknowledges support by the International Helmholtz Research School of Biophysics and Soft Matter (IHRS BioSoft).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο