Speaker
John Jurns
(National Institute of Standards and Technology)
Description
The NIST Center for Neutron Research (NCNR) operates a 20 MW research reactor that produces neutrons for a suite of 30 neutron scattering instruments. 70% of these instruments use cold neutrons (E < 5 meV), which are moderated by two separate cold neutron sources. The cold moderator for both sources is liquid hydrogen (LH2), which is in turn cooled by a recently commissioned 7 kW, 14K helium refrigerator. NCNR plans to replace the larger cold source with a new one operating with liquid deuterium (LD2). This report focuses on progress towards the upgrade to liquid deuterium, and options to address the particular challenges of designing and operating a cooling system that will simultaneously support operation with both LH2 and LD2 sources.
Primary authors
John Jurns
(National Institute of Standards and Technology)
Dr
Robert Williams
(National Institute of Standards and Technology)
Mr
Michael Middleton
(National Institute of Standards and Technology)
