Gamma-ray and fast neutron radiation effects on thin film superconductors

Cooksey, J.A.; Brown, W.D.; Ang, Simon S.; Naseem, H. A.; Ulrich, Richard K.; West, L.

doi:10.1109/23.340610

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…Earlier experiments on the influence of gamma rays on YBCO superconducting properties (critical temperature and critical current) have been reported in [1,2]. As previously reported, the critical temperature and critical current density of thin superconducting films were not affected by gamma ray exposure up to a cumulative dose of 1.5 Mrad [3].…”

Section: Introductionsupporting

confidence: 61%

Microwave Characterization of Gamma Ray Irradiated Thin Film Embedded and Non-embedded Nb Resonators

Yelamanchili

Gupta

Zou

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Gamma radiation effects on superconducting microwave transmission line structures, which may find use in future radiation challenging environments, such as satellites or accelerators have been investigated. Two versions of weakly coupled through-type Nb microstrip transmission line resonator material stack-ups were explored. In one version, the Nb signal trace was encapsulated with 20 µm of HD-4110 and in the other version the top Nb was not encapsulated. Exposure of the resonators to gamma radiation was performed for 28 days at room temperature in a sealed vacuum chamber using Co-60 as the gamma radiation source. The quality factors of the resonators were extracted at various cryogenic temperatures below the critical temperature of Nb and resonant frequencies up to 20 GHz. A large dose of gamma radiation used in this work showed a small change in the Nb superconducting properties.

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Section: Introductionsupporting

confidence: 61%

Microwave Characterization of Gamma Ray Irradiated Thin Film Embedded and Non-embedded Nb Resonators

Yelamanchili

Gupta

Zou

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…On this way, the papers dedicated to study gamma irradiation effects on the HTS properties are characterized for a lack of coincidence in criteria and results. Some authors have observed an improvement of the superconducting properties with dose increment (Boiko et at., 1988;Leyva et al, 1992), some others report exactly the opposite (Vasek et al, 1989;Elkholy et al, 1996), and other studies have not found any dependence (Bohandy et al, 1987;Cooksey et al, 1994). These contradictions have not been completely explained yet; some authors even attribute these behaviors to a "sample effect" (Polyak et al, 1990).…”

Section: Introductionmentioning

confidence: 81%

Studies on the Gamma Radiation Responses of High Tc Superconductors

Inclán¹,

Hernández²,

Fabelo³

et al. 2010

Superconductor

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“…Older studies, however, observe conflicting effects. Cooksey et al [12] irradiated two YBCO samples using a Cs-137 source. In one sample they observed an initial increase to 1.2 × I c0 (77 K) after a 6 kGy dose followed by a drop to 0.9 × I c0 (77 K) after a 15 kGy dose.…”

Section: Discussionmentioning

confidence: 99%

“…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%

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

L.¹,

Bullock²,

Turner³

et al. 2023

Supercond. Sci. Technol.

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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.

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Gamma-ray and fast neutron radiation effects on thin film superconductors

Cited by 9 publications

References 10 publications

Microwave Characterization of Gamma Ray Irradiated Thin Film Embedded and Non-embedded Nb Resonators

Microwave Characterization of Gamma Ray Irradiated Thin Film Embedded and Non-embedded Nb Resonators

Studies on the Gamma Radiation Responses of High Tc Superconductors

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

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