Investigation of Irradiation Effect on REBCO Coated Conductors for Future Radiation-Resistant Magnet Applications

Iio, M.; Yoshida, Makoto; Nakamoto, T.; Ogitsu, T.; Sugano, M.; Suzuki, K.; Idesaki, Akira

doi:10.1109/tasc.2022.3168620

Cited by 6 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed null effect of gamma fluence corroborates the negligible effect of gamma flux on 77 K critical current, I c (77 K), at a dose of up to 27.4 MGy reported in recent work by Iio et al [11]. Older studies, however, observe conflicting effects.…”

Section: Discussionsupporting

confidence: 88%

“…However, in all of these studies [12][13][14], the YBCO layer was exposed to air during irradiation and would therefore have been subject to gamma-induced chemical reactions which may have contributed to the observed change in I c [13]. In the aforementioned work by Iio et al [11] the samples were commercial REBCO tapes complete with their protective silver and copper layers (as in our study), which were additionally sealed in vacuum during irradiation and measurement to prevent these chemical reactions. The results from these works are summarised in table 1.…”

Section: Discussionmentioning

confidence: 91%

“…Such experiments are valuable to determine the engineering lifetime of superconductors as a function of radiation fluence, but offer no information as to how radiation affects superconductivity during current flow. They also have conflicting conclusions: some observe no change in critical current with fluence [11,12]; others show an initial increase in critical current, followed by a decrease at larger fluences [12,13]; others still only show a decrease in critical current with fluence [14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In-situ critical current measurements of REBCO coated conductors during gamma irradiation

L.¹,

Bullock²,

Turner³

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Rare-earth-barium-copper-oxide (REBCO) coated conductor tapes within next-generation tokamak pilot and power plant magnets will be exposed to broad-spectrum gamma-ray and neutron irradiation concurrently. It has been known since the 1980s that cumulative neutron fluence affects the superconducting properties of REBCO, but the effects of gamma rays are less certain, as are the effects of radiation (of any kind) during current flow. However, the use of superconductors as photon detectors suggests that energetic photons interact directly with the superconducting state, locally destroying superconductivity. Hence, as well as the effect of the overall radiation dose (fluence), the effect of radiation dose rate (flux) on the superconductor’s properties must be quantified to understand how REBCO magnets will perform during fusion magnet operation.In-situ measurements of the self-field critical current at 77 K, of several REBCO coated conductor tapes were performed during Co-60 gamma ray exposure at a dose rate of 86 Gy min−1. Samples were fully submerged in liquid nitrogen throughout the measurements. No change in the critical current of any sample during or after irradiation was observed within standard error. These are the first reported in-situ measurements of critical current during fusion-relevant gamma irradiation. Two samples were irradiated to a further dose of 208 kGy at room temperature and a second round of in-situ measurements was performed. No change in the critical current of these samples was observed within standard error. This corroborates recent studies, but is in conflict with older literature.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In-situ critical current measurements of REBCO coated conductors during gamma irradiation

L.¹,

Bullock²,

Turner³

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…To study the neutron irradiation effect on the superconducting material, a novel test facility on the superconductivity measurement for post irradiation has been installed in a radiation control area at Oarai center in the Institute for Materials Research in Tohoku University in 2012 [2], and much valuable data has been presented and published, while many steady improvements have been made [3][4][5][6][7][8]. Also, studies on the irradiation effect on high temperature superconducting tapes are undergoing with this facility [9].…”

Section: Introductionmentioning

confidence: 99%

Change in Critical Surface of Nb<sub>3</sub>Sn Wire by Neutron Irradiation

Nishimura

HISHINUMA

Oguro

et al. 2023

Plasma and Fusion Research

View full text Add to dashboard Cite

Neutron irradiation on Nb 3 Sn wire changes its superconducting properties. It is well known that the critical current increases by the irradiation once and then decreases by further irradiation. In this paper, the effective upper critical magnetic field and the critical temperature of the irradiated Nb 3 Sn wire were investigated, and the mechanism that causes such changes were discussed qualitatively by focusing on the role of the irradiation defects together with the normal metallurgical flaws. In addition, a critical surface was taken up and the general tendency of the change in the surface was discussed.

show abstract