Implementation of the beryllium reflector filter concept in the LANSCE 1L target Mark-III upgrade.
Conference
·
OSTI ID:977966
- Guenter
- Eric J.
- Gary J.
We have investigated the possibility of implementing the idea of a beryllium reflector filter in the LANSCE 1L target Mark-III upgrade. We will present different concepts of beryllium reflector filters (megaphone, chevron and swiss-cheese concept) and their effect on the integrated cold flux and the time distribution of the lower tier hydrogen flux-trap moderator as a function of the three instruments, (SPEAR, LQD and Asterix) which are served by this moderator. As part of the LANSCE 1L target upgrade study it is the declared goal to increase the cold flux (E < 5meV) of the lower tier partially coupled liquid hydrogen moderator by a factor of two. This goal is proposed to be achieved by adding a pre-moderator system to the moderator and by implementing the cold beryllium reflector concept. The cold beryllium reflector filter concept was tested in an experiment at the weapons neutron research (WNR) facility at LANSCE in January 2003 by Pitcher et al. Based on the success of this experiment it was then decided to implement this concept into the 1L target Mark-III upgrade. In this context a series of Monte Carlo transport calculations was performed to optimize the cold neutron flux.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977966
- Report Number(s):
- LA-UR-05-3168
- Country of Publication:
- United States
- Language:
- English
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