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Title: Heat transfer study on the beamline for an electron–ion collider at BNL

This study aims to calculate thermal loads that arise as a consequence of the beamline connecting the cold (2 K) region to the ambient. Heat loads are evaluated by numerical analysis and the findings are supported by analytical calculations. An active heat intercept is proposed to mitigate heat movement to the cold end. Owing to unfavorable length-to-depth ratio and large temperature differences, it is found that radiation becomes a dominant mode of heat transfer. The presence of bellows on the beamline complicates the thermal study which is heavily dependent on geometry. An analytical framework is set up to simplify the coupled conduction–radiation problem and is shown to decrease simulation times by an order of magnitude. The study finds that the total heat moving by conduction to the cold end is around 13 W and via radiation is 1.8 W. Furthermore, the active cooling circuit under present conditions has the ability to intercept between 8 - 12 W of heat.
Authors:
 [1] ;  [2] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Report Number(s):
BNL-207822-2018-JAAM
Journal ID: ISSN 0168-9002
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 903; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Beamline; Thermal; Numerical analysis; Radiation; Heat intercept
OSTI Identifier:
1460708

Ravikumar, Dhananjay K., Than, Yatming, and Longtin, Jon. Heat transfer study on the beamline for an electron–ion collider at BNL. United States: N. p., Web. doi:10.1016/j.nima.2018.06.048.
Ravikumar, Dhananjay K., Than, Yatming, & Longtin, Jon. Heat transfer study on the beamline for an electron–ion collider at BNL. United States. doi:10.1016/j.nima.2018.06.048.
Ravikumar, Dhananjay K., Than, Yatming, and Longtin, Jon. 2018. "Heat transfer study on the beamline for an electron–ion collider at BNL". United States. doi:10.1016/j.nima.2018.06.048.
@article{osti_1460708,
title = {Heat transfer study on the beamline for an electron–ion collider at BNL},
author = {Ravikumar, Dhananjay K. and Than, Yatming and Longtin, Jon},
abstractNote = {This study aims to calculate thermal loads that arise as a consequence of the beamline connecting the cold (2 K) region to the ambient. Heat loads are evaluated by numerical analysis and the findings are supported by analytical calculations. An active heat intercept is proposed to mitigate heat movement to the cold end. Owing to unfavorable length-to-depth ratio and large temperature differences, it is found that radiation becomes a dominant mode of heat transfer. The presence of bellows on the beamline complicates the thermal study which is heavily dependent on geometry. An analytical framework is set up to simplify the coupled conduction–radiation problem and is shown to decrease simulation times by an order of magnitude. The study finds that the total heat moving by conduction to the cold end is around 13 W and via radiation is 1.8 W. Furthermore, the active cooling circuit under present conditions has the ability to intercept between 8 - 12 W of heat.},
doi = {10.1016/j.nima.2018.06.048},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 903,
place = {United States},
year = {2018},
month = {7}
}