Neutronic studies on decoupled hydrogen moderator for a short-pulse spallation source

Harada, Masahide; Watanabe, Noboru; Teshigawara, Makoto; Kai, Tetsuya; Ikeda, Yujiro

doi:10.1016/j.nima.2004.10.013

Cited by 29 publications

(15 citation statements)

References 8 publications

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“…As mentioned above, the neutronic performance, particularly pulse shape, strongly depends on the para-hydrogen fraction [35,38], as shown in Figure 12. E. B. Iverson and J. M. Carpenter calculated the irradiation effect on the para-hydrogen to ortho-hydrogen conversion under the high neutron irradiation environment [44,45].…”

mentioning

confidence: 82%

“…On the other hand, it was estimated that neutrons leaked more quickly in the slowing down process. To overcome the drawback of hydrogen for an MW-class energy source, extensive optimization studies have been conducted [30][31][32][33][34][35][36][37][38][39][40]. Especially for the coupled moderator, unique optimization to have large sized cylindrical shape coupled with optimized water pre-moderator gave higher neutron intensity [36,37], and so could provide the highest neutron intensity per pulse in the world [40].…”

mentioning

confidence: 99%

“…Ag-In-Cd sheathed Figure 12. (a) Para-hydrogen concentration dependence on pulse shapes for the coupled moderator [30] and (b) the de-coupled one [38].…”

mentioning

confidence: 99%

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Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

Tazaki

Haga

Teshigawara

et al. 2017

QuBS

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Abstract:At the Japan Proton Accelerator Research Complex (J-PARC), a pulsed spallation neutron source provides neutrons with high intensity and narrow pulse width pulse to promote researches on a variety of science in the Materials and Life Science Experimental Facility (MLF). It was designed to be driven by a proton beam with an energy of 3 GeV, a power of 1 MW at a repetition rate of 25 Hz, that is world's highest power level. It is still on the way towards the goal to accomplish the operation with a 1 MW proton beam. In this review, distinctive features of the target-moderator-reflector system of the pulsed spallation neutron source are presented.

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confidence: 82%

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confidence: 99%

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Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

Tazaki

Haga

Teshigawara

et al. 2017

QuBS

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“…This figure has been used in other optimization studies [2,9,10] and has been found to be a representative figure of the assembly performance. An optimization loop has been carried out for each target design considering the main geometrical parameters, i.e., relative position of target and moderator, moderator radius, premoderator thickness and reflector dimensions.…”

Section: Methodsmentioning

confidence: 99%

Neutron performance analysis for ESS target proposal

Magán¹,

Terrón²,

Thomsen

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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In the course of discussing different target types for their suitability in the European Spallation Source (ESS) one main focus was on neutronics' performance. Diverse concepts have been assessed baselining some preliminary engineering and geometrical details and including some optimization. With the restrictions and resulting uncertainty imposed by the lack of detailed designs optimizations at the time of compiling this paper, the conclusion drawn is basically that there is a little difference in the neutronic yield of the investigated targets. Other criteria like safety, environmental compatibility, reliability and cost will thus dominate the choice of an ESS target.

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“…Three supercritical hydrogen moderators are placed in "wing-geometry" with respect to the mercury target surrounded with the inner beryllium and outer steel reflector [48]. The upper two moderators provide superior pulse characteristics with narrow peak width using Ag-InCd alloy as decoupling (neutron absorption) material [49,50]. The lower one is for highest peak and time-averaged intensity by surrounded with H 2 O pre-moderator for enhancement of neutron intensity [51].…”

Section: Effect Of Nuclear Data In Designmentioning

confidence: 99%

Accelerator-based facility design in association with nuclear data

Tazaki

2007

Nd2007

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Abstract. At present, large research infrastructures using high energy and high beam intensity accelerator have been almost realized as examples of SINQ, J-PARC and SNS. In the design study of such accelerator facilities, it is required to seek the best neutronic performance and assure engineering feasibilities such as heat removal from the target and its surroundings, material selection to have enough life-time under radiation environment for reasonable operation duration. It is also important to design sophisticated maintenance scheme including remote handling to treat highly activated components, and optimal radiation shield around them. The roles of nuclear data to these aspects and perspectives are reviewed through the design of J-PARC spallation neutron source.

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Neutronic studies on decoupled hydrogen moderator for a short-pulse spallation source

Cited by 29 publications

References 8 publications

Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

Neutron performance analysis for ESS target proposal

Accelerator-based facility design in association with nuclear data

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