STUDY OF THE MODERATORS OF SNS

Fahima F. Islam; Erik B. Iverson; Matthew Frost; Franz X. Gallmeier

doi:10.13182/T125-36997

STUDY OF THE MODERATORS OF SNS

Fahima F. Islam, Erik B. Iverson, Matthew Frost, Franz X. Gallmeier

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The performance of the moderators of Spallation Neutron Source (SNS) at Oak Ridge National Laboratory are evaluated based on the neutron counts delivered to the scattering instruments. It was observed before that the neutron flux is not increasing linearly with the proton power. In this work, we have assessed energy dependent neutron intensities per proton beam power delivered to the target by changing the proton pulse repetition rates and hydrogen flow rates. We have found that the neutron intensities per proton beam power at instruments viewing the decoupled hydrogen moderator are affected by proton power and flow rates and no effects are seen on instruments viewing the coupled hydrogen or the decoupled water moderators. The unique contribution of this work is the observation that increasing the hydrogen flow rate in the decoupled hydrogen moderator reduces the source brightness degradation observed with higher beam power.

Original language	English
Title of host publication	Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting
Publisher	American Nuclear Society
Pages	116-121
Number of pages	6
ISBN (Electronic)	9780894487842
DOIs	https://doi.org/10.13182/T125-36997
State	Published - 2022
Event	14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting - Washington, United States Duration: Nov 30 2021 → Dec 4 2021

Publication series

Name	Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting

Conference

Conference	14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting
Country/Territory	United States
City	Washington
Period	11/30/21 → 12/4/21

Funding

This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory.

Keywords

Hydrogen flow rates
Moderators
proton power

Access to Document

10.13182/T125-36997

Cite this

Islam, F. F., Iverson, E. B., Frost, M., & Gallmeier, F. X. (2022). STUDY OF THE MODERATORS OF SNS. In Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting (pp. 116-121). (Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting). American Nuclear Society. https://doi.org/10.13182/T125-36997

Islam, Fahima F. ; Iverson, Erik B. ; Frost, Matthew et al. / STUDY OF THE MODERATORS OF SNS. Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting. American Nuclear Society, 2022. pp. 116-121 (Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting).

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title = "STUDY OF THE MODERATORS OF SNS",

abstract = "The performance of the moderators of Spallation Neutron Source (SNS) at Oak Ridge National Laboratory are evaluated based on the neutron counts delivered to the scattering instruments. It was observed before that the neutron flux is not increasing linearly with the proton power. In this work, we have assessed energy dependent neutron intensities per proton beam power delivered to the target by changing the proton pulse repetition rates and hydrogen flow rates. We have found that the neutron intensities per proton beam power at instruments viewing the decoupled hydrogen moderator are affected by proton power and flow rates and no effects are seen on instruments viewing the coupled hydrogen or the decoupled water moderators. The unique contribution of this work is the observation that increasing the hydrogen flow rate in the decoupled hydrogen moderator reduces the source brightness degradation observed with higher beam power.",

keywords = "Hydrogen flow rates, Moderators, proton power",

author = "Islam, {Fahima F.} and Iverson, {Erik B.} and Matthew Frost and Gallmeier, {Franz X.}",

note = "Publisher Copyright: {\textcopyright} 2022 AMERICAN NUCLEAR SOCIETY, INCORPORATED.; 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting ; Conference date: 30-11-2021 Through 04-12-2021",

year = "2022",

doi = "10.13182/T125-36997",

language = "English",

series = "Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting",

publisher = "American Nuclear Society",

pages = "116--121",

booktitle = "Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting",

}

Islam, FF , Iverson, EB , Frost, M & Gallmeier, FX 2022, STUDY OF THE MODERATORS OF SNS. in Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting. Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting, American Nuclear Society, pp. 116-121, 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting, Washington, United States, 11/30/21. https://doi.org/10.13182/T125-36997

STUDY OF THE MODERATORS OF SNS. / Islam, Fahima F.; Iverson, Erik B.; Frost, Matthew et al.
Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting. American Nuclear Society, 2022. p. 116-121 (Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Islam, Fahima F.

AU - Iverson, Erik B.

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N2 - The performance of the moderators of Spallation Neutron Source (SNS) at Oak Ridge National Laboratory are evaluated based on the neutron counts delivered to the scattering instruments. It was observed before that the neutron flux is not increasing linearly with the proton power. In this work, we have assessed energy dependent neutron intensities per proton beam power delivered to the target by changing the proton pulse repetition rates and hydrogen flow rates. We have found that the neutron intensities per proton beam power at instruments viewing the decoupled hydrogen moderator are affected by proton power and flow rates and no effects are seen on instruments viewing the coupled hydrogen or the decoupled water moderators. The unique contribution of this work is the observation that increasing the hydrogen flow rate in the decoupled hydrogen moderator reduces the source brightness degradation observed with higher beam power.

AB - The performance of the moderators of Spallation Neutron Source (SNS) at Oak Ridge National Laboratory are evaluated based on the neutron counts delivered to the scattering instruments. It was observed before that the neutron flux is not increasing linearly with the proton power. In this work, we have assessed energy dependent neutron intensities per proton beam power delivered to the target by changing the proton pulse repetition rates and hydrogen flow rates. We have found that the neutron intensities per proton beam power at instruments viewing the decoupled hydrogen moderator are affected by proton power and flow rates and no effects are seen on instruments viewing the coupled hydrogen or the decoupled water moderators. The unique contribution of this work is the observation that increasing the hydrogen flow rate in the decoupled hydrogen moderator reduces the source brightness degradation observed with higher beam power.

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BT - Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting

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Islam FF , Iverson EB , Frost M , Gallmeier FX. STUDY OF THE MODERATORS OF SNS. In Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting. American Nuclear Society. 2022. p. 116-121. (Proceedings of the 14th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2021, Embedded with the 2021 ANS Winter Meeting). doi: 10.13182/T125-36997

STUDY OF THE MODERATORS OF SNS

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Keywords

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