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Title: Optimization of high heat flux components for DIII-D neutral beam upgrades

Abstract

Upgrade of the DIII-D neutral beams leads to enhanced heat loads on many components, such as calorimeter, collimator, and pole shields which protect neutral beam magnets. Power increase from 2.6 MW to 3.2 MW per source leads to a normal heat flux loads of up to 55 MW/m2 for the calorimeter. The Princeton Plasma Physics Laboratory is responsible for the design and manufacturing of the upgrades of these components. Heat flux distribution on neutral beam components is very uneven and leads to significant thermal stresses. High heat flux density impact requires surface optimization to reduce surface heat flux projection, and avoid localized melting. Several new design features were introduced to accommodate increased heat loads, such as molybdenum inserts for the pole shields, two-dimensional shaping for the calorimeter, and three-dimensional shape optimization and replaceable copper inserts for the collimator. Also, all three components include an optimized cooling system design featuring peripheral cooling of copper components. The optimization process included applying analytical relations for the transient temperature distributions on the high heat flux components. These relations were confirmed by previous DIII-D experimental results. To confirm the designs, numerical simulations were performed. Results of the design optimization and numerical simulations will be presented.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1504220
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Name: Fusion Engineering and Design; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Neutral beam; Fusion device; Numerical analysis; Heat load mitigation

Citation Formats

Khodak, Andrei, Zatz, Irving, Wang, Wenping, Finehart, Alex, Malament, Yury, Nagy, Alex, Titus, Peter, Nazikian, Raffi, and Scoville, Tim. Optimization of high heat flux components for DIII-D neutral beam upgrades. United States: N. p., 2019. Web. doi:10.1016/j.fusengdes.2019.02.047.
Khodak, Andrei, Zatz, Irving, Wang, Wenping, Finehart, Alex, Malament, Yury, Nagy, Alex, Titus, Peter, Nazikian, Raffi, & Scoville, Tim. Optimization of high heat flux components for DIII-D neutral beam upgrades. United States. doi:10.1016/j.fusengdes.2019.02.047.
Khodak, Andrei, Zatz, Irving, Wang, Wenping, Finehart, Alex, Malament, Yury, Nagy, Alex, Titus, Peter, Nazikian, Raffi, and Scoville, Tim. Tue . "Optimization of high heat flux components for DIII-D neutral beam upgrades". United States. doi:10.1016/j.fusengdes.2019.02.047.
@article{osti_1504220,
title = {Optimization of high heat flux components for DIII-D neutral beam upgrades},
author = {Khodak, Andrei and Zatz, Irving and Wang, Wenping and Finehart, Alex and Malament, Yury and Nagy, Alex and Titus, Peter and Nazikian, Raffi and Scoville, Tim},
abstractNote = {Upgrade of the DIII-D neutral beams leads to enhanced heat loads on many components, such as calorimeter, collimator, and pole shields which protect neutral beam magnets. Power increase from 2.6 MW to 3.2 MW per source leads to a normal heat flux loads of up to 55 MW/m2 for the calorimeter. The Princeton Plasma Physics Laboratory is responsible for the design and manufacturing of the upgrades of these components. Heat flux distribution on neutral beam components is very uneven and leads to significant thermal stresses. High heat flux density impact requires surface optimization to reduce surface heat flux projection, and avoid localized melting. Several new design features were introduced to accommodate increased heat loads, such as molybdenum inserts for the pole shields, two-dimensional shaping for the calorimeter, and three-dimensional shape optimization and replaceable copper inserts for the collimator. Also, all three components include an optimized cooling system design featuring peripheral cooling of copper components. The optimization process included applying analytical relations for the transient temperature distributions on the high heat flux components. These relations were confirmed by previous DIII-D experimental results. To confirm the designs, numerical simulations were performed. Results of the design optimization and numerical simulations will be presented.},
doi = {10.1016/j.fusengdes.2019.02.047},
journal = {Fusion Engineering and Design},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 5, 2020
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