CERN Accelerating science

Preprint
Report number	JINR-E3-2003-56
Title	The New Water Moderator of the IBR-2 Reactor with a Canyon on the Lateral Surface. Design and Physical Parameters
Author(s)	Korneev, D A ; Beliakov, A A ; Bodnarchuk, V I ; Peresedov, V F ; Rogov, A D ; Shabalin, E P ; Yaradaikin, S P
Affiliation	(Frank Laboratory of Neutron Physics, Dubna)
Publication	2003
Imprint	28 Mar 2003
Number of pages	6
Published in:	Nucl. Instrum. Methods Phys. Res.
Subject category	Particle Physics - Experiment
Abstract	An element of the new cold methane moderator of the reactor IBR-2, the water premoderator, serves as a thermal moderator for the 9th and 1st channels. Neutron radiation in the direction of the 9th channel comes from the lateral surface of the moderator. A specific feature of the reflectometer REFLEX located on the 9th channel is that it only "sees" neutrons emitted from a limited region of the moderator surface. This region is a rectangular extended along a vertical with a horizontal dimension of about 7 mm. To increase the flux on the sample, a groove-like pocket (canyon) with a depth of 80 mm by the width 15 mm and height 200 mm was cut in the premoderator on its lateral surface. The design of the moderator and the results of measurements of the neutron flux distribution on the lateral surface of the moderator are presented.
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