Porosity evolution in proton irradiated microfine-grained POCO graphite

Jiang, Ming; Ammigan, Kavin; Lolov, George; Pellemoine, Frederique; Liu, Dong

doi:10.1016/j.jnucmat.2023.154732

Title: Porosity evolution in proton irradiated microfine-grained POCO graphite

Journal Article · 09 September 2023 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2023.154732 · OSTI ID:2005194

^[1];

^[2]; Lolov, George ^[2]; Pellemoine, Frederique ^[2];

^[1]

Univ. of Bristol (United Kingdom)
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

This work investigated the porosity evolution of POCO ZXF-5Q graphite that has been irradiated by 340 kW, 120 GeV protons inside NT02 target system in Fermilab's NuMI beamline. This POCO graphite has undergone direct bulk dimensional swelling at low dose irradiation and its local microstructural change is still not well-understood during this process. In this work, the (sub-) micrometre scale porosity from six locations across proton beam fluence and temperature gradients have been studied using focused ion beam-scanning electron microscopy (FIB-SEM) tomography. Here, a deep learning-based tomographic image segmentation technique has been established and implemented for porosity segmentation and quantification. It has been found that there is a decrease in the total volumetric percentage of the porosity at proton beam centre (~ 8 – 8.4 vol.%), by comparing to un-irradiated POCO (~ 12 – 13vol.%) and to beam 2σ and 5σ radii (~ 12vol.%). This decrease in porosity volume percentage was found to be caused by the reduction in pores with volumes > 0.1 μm³ induced by material bulk dimensional swelling at proton beam centre area. The porosity reduction in relation to dimensional change and irradiation creep was discussed among with other contributing factors, and further investigations through well-controlled irradiation experiment are still needed.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 2005194

Report Number(s):: FERMILAB-PUB-23-545-AD; oai:inspirehep.net:2701199; TRN: US2405758

Journal Information:: Journal of Nuclear Materials, Vol. 587; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Porosity evolution in proton irradiated microfine-grained POCO graphite

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