Multiphysics Simulations of Thermal Shock Testing of Nanofibrous High Power Targets

Conference · Wed May 29 04:00:00 EDT 2024

DOI:https://doi.org/10.18429/JACoW-IPAC2024-TUPS44· OSTI ID:2371014

Asztalos, W. ^[1]; Torun, Y. ^[1]; Bidhar, S. ^[2]; Pellemoine, F. ^[2]; Rath, P. ^[3]

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1. IIT, Chicago
2. Fermilab
3. Indian Inst. Tech., Bhubaneswar

Increase of primary beam power for neutrino beam-lines leads to a reduced lifespan for production targets. New concepts for robust targets are emerging from the field of High Power Targetry (HPT); one idea being investigated by the HPT R&D Group at Fermilab is an electrospun nanofiber target. As part of their evaluation, samples with different densities were sent to the HiRadMat facility at CERN for thermal shock tests. The samples with the higher density, irradiated under a high intensity beam pulse, exhibit major damage at the impact site whereas those with the lower density show no apparent damage. The exact cause of this failure was unclear at the time. In this paper, we present the results of multiphysics simulations of the thermal shock experienced by the nanofiber targets that suggest the failure originates from the reduced permeability of the high density sample to air flow. The air present in the porous target expands due to heating from the beam, but is unable to flow freely in the high density sample, resulting in a larger back pressure that blows apart the nanofiber mat. We close with a discussion on how to further validate this hypothesis.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2371014
• Report Number(s): FERMILAB-CONF-24-0252-AD; arXiv:2405.19496; oai:inspirehep.net:2791809
• Country of Publication: United States
• Language: English

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