The upgrade of intense pulsed neutron source (IPNS) through the change of coolant and reflector

I. Baek; J. M. Carpenter; E. Iverson

doi:10.1016/S0168-9002(02)01090-2

The upgrade of intense pulsed neutron source (IPNS) through the change of coolant and reflector

I. Baek, J. M. Carpenter, E. Iverson

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The current intense pulsed neutron source (IPNS) depleted uranium target is cooled by light water. The inner reflector material is graphite and the outer reflector material is beryllium. The presence of H₂O in the target moderates neutrons and leads to a higher absorption loss in the target than is necessary. D₂O coolant in the small quantities required minimizes this effect. We have studied the possible improvement in IPNS beam fluxes that would result from changing the coolant from H₂O to D₂O and the inner reflector from graphite to beryllium. Neutron intensities were calculated for directions normal to the viewed surface of each moderator for four different cases of combinations of target coolant and reflector materials. The simulations reported here were performed using the MCNPX (version 2.1.5) computer program. Our results show that substantial gains in neutron beam intensities can be achieved by appropriate combination of target coolant and reflector materials. The combination of D₂O coolant and beryllium inner and outer reflectors improves facility performance about 1.3 times. The purpose of this summary is to report our simulation and to recommend to change target coolant and inner reflector materials based on our simulation results.

Original language	English
Pages (from-to)	522-526
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	490
Issue number	3
DOIs	https://doi.org/10.1016/S0168-9002(02)01090-2
State	Published - Sep 11 2002
Externally published	Yes

Keywords

MCNP
Moderator
Monte Carlo simulation
Reflector
Spallation neutron source
Time-averaged neutron spectrum

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10.1016/S0168-9002(02)01090-2

Cite this

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title = "The upgrade of intense pulsed neutron source (IPNS) through the change of coolant and reflector",

abstract = "The current intense pulsed neutron source (IPNS) depleted uranium target is cooled by light water. The inner reflector material is graphite and the outer reflector material is beryllium. The presence of H2O in the target moderates neutrons and leads to a higher absorption loss in the target than is necessary. D2O coolant in the small quantities required minimizes this effect. We have studied the possible improvement in IPNS beam fluxes that would result from changing the coolant from H2O to D2O and the inner reflector from graphite to beryllium. Neutron intensities were calculated for directions normal to the viewed surface of each moderator for four different cases of combinations of target coolant and reflector materials. The simulations reported here were performed using the MCNPX (version 2.1.5) computer program. Our results show that substantial gains in neutron beam intensities can be achieved by appropriate combination of target coolant and reflector materials. The combination of D2O coolant and beryllium inner and outer reflectors improves facility performance about 1.3 times. The purpose of this summary is to report our simulation and to recommend to change target coolant and inner reflector materials based on our simulation results.",

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author = "I. Baek and Carpenter, {J. M.} and E. Iverson",

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doi = "10.1016/S0168-9002(02)01090-2",

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pages = "522--526",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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The upgrade of intense pulsed neutron source (IPNS) through the change of coolant and reflector. / Baek, I.; Carpenter, J. M.; Iverson, E.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 490, No. 3, 11.09.2002, p. 522-526.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

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AU - Baek, I.

AU - Carpenter, J. M.

AU - Iverson, E.

PY - 2002/9/11

Y1 - 2002/9/11

N2 - The current intense pulsed neutron source (IPNS) depleted uranium target is cooled by light water. The inner reflector material is graphite and the outer reflector material is beryllium. The presence of H2O in the target moderates neutrons and leads to a higher absorption loss in the target than is necessary. D2O coolant in the small quantities required minimizes this effect. We have studied the possible improvement in IPNS beam fluxes that would result from changing the coolant from H2O to D2O and the inner reflector from graphite to beryllium. Neutron intensities were calculated for directions normal to the viewed surface of each moderator for four different cases of combinations of target coolant and reflector materials. The simulations reported here were performed using the MCNPX (version 2.1.5) computer program. Our results show that substantial gains in neutron beam intensities can be achieved by appropriate combination of target coolant and reflector materials. The combination of D2O coolant and beryllium inner and outer reflectors improves facility performance about 1.3 times. The purpose of this summary is to report our simulation and to recommend to change target coolant and inner reflector materials based on our simulation results.

AB - The current intense pulsed neutron source (IPNS) depleted uranium target is cooled by light water. The inner reflector material is graphite and the outer reflector material is beryllium. The presence of H2O in the target moderates neutrons and leads to a higher absorption loss in the target than is necessary. D2O coolant in the small quantities required minimizes this effect. We have studied the possible improvement in IPNS beam fluxes that would result from changing the coolant from H2O to D2O and the inner reflector from graphite to beryllium. Neutron intensities were calculated for directions normal to the viewed surface of each moderator for four different cases of combinations of target coolant and reflector materials. The simulations reported here were performed using the MCNPX (version 2.1.5) computer program. Our results show that substantial gains in neutron beam intensities can be achieved by appropriate combination of target coolant and reflector materials. The combination of D2O coolant and beryllium inner and outer reflectors improves facility performance about 1.3 times. The purpose of this summary is to report our simulation and to recommend to change target coolant and inner reflector materials based on our simulation results.

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The upgrade of intense pulsed neutron source (IPNS) through the change of coolant and reflector

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Keywords

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