Magnesium diboride on inner wall of copper tube: A test case for superconducting radio frequency cavities

Withanage, Wenura K.; Lee, N. H.; Penmatsa, Sashank V.; Wolak, Matthaeus; Nassiri, A.; Xi, X. X.

doi:10.1103/physrevaccelbeams.20.102002

Cited by 7 publications

(2 citation statements)

References 11 publications

(15 reference statements)

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“…Specifically, its relatively high critical temperature ( » T 40 K C ) simplifies cryogenic requirements, its relatively long coherence length avoids the problem of grain boundaries acting as weak links, and its stoichiometry and crystal structure are simple [1][2][3][4][5]. These advantages continue to stimulate substantial work on power applications such as conductors, RF cavities, and digital applications to mention a few [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Current-phase relation in a short clean josephson junction model: application to MgB₂

Agassi

Oates

2020

J. Phys. Commun.

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Motivated by recent data on high-quality MgB 2 thin films implying that the smaller energy gap has l=6 (i-wave) symmetry, we consider a simple model for an all-MgB 2 symmetric Josephson Junction (JJ). The model assumes an arbitrary-strength delta-function barrier and one-dimensional current conduction. It is shown that in this context a nodal energy gap with i-wave symmetry acts as an isotropic energy gap (s-wave) with an amplitude modified by the energy-gap misalignment-angle with respect to the crystal principal axes. The corresponding exact Green's function in momentum space is derived employing a novel approach. The ensuing current-phase relations in the strong and weak barrier-strengths limits are calculated and found to confirm known results, e.g., the Ambegaokar-Baratoff current-phase relation. Inspired by an HTS experiment that established the d-wave energygap symmetry, we propose a JJ-related experiment with a MgB 2 bicrystal to confirm our premise that the smaller energy has i-wave symmetry.

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Section: Introductionmentioning

confidence: 99%

Current-phase relation in a short clean josephson junction model: application to MgB₂

Agassi

Oates

2020

J. Phys. Commun.

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“…Three-dimensional MgB 2 films can maintain the magnetic shielding capability while meeting the dimension and outline demands of a range of technical needs, whence they have great research value. Very recently, Xi et al tried to fabricate MgB 2 films directly inside a Cu tube to meet the demand of SRF cavities, and got promising results [29,30]; the T C is in the range of 30-38 K, which indicates that HPCVD can be used in 3D film fabrication. For magnetic shielding, non-metal tubes with thick MgB 2 films are required.…”

Section: Introductionmentioning

confidence: 99%

MgB₂thick films on three-dimensional structures fabricated by HPCVD

Guo¹,

Cai²,

Liao³

et al. 2018

Supercond. Sci. Technol.

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Magnetic shielding has been a key factor in the measurement of ultra-weak magnetic fields, especially for shielding from low frequency electromagnetic noise. With the recent development of superconducting quantum interference devices, superconducting magnetic shielding has become an important area of research. MgB 2 has shown great potential in magnetic shielding for its remarkable superconducting properties, the feasibility of its use in this capacity having been demonstrated by MgB 2 bulk samples. However, the potential for application of such bulk samples is limited. In this work, we have investigated the possibility of the fabrication of MgB 2 films on three-dimensional (3D) structures using a hybrid physical−chemical vapor deposition system. MgB 2 films 10 μm thick have been fabricated on the outer surface of a polycrystalline Al 2 O 3 cylinder. The deposited film showed a transition temperature (T C ) of 39 K and J C of 5.1×10 5 A•cm −2 , which are comparable to those of planar MgB 2 films. This work shows the feasibility of depositing MgB 2 films onto a 3D structure, and sheds light on the potential use of MgB 2 films in superconducting magnetic shielding.

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Fabrication and Radio Frequency Properties of 3-GHz SRF Cavities Coated with MgB2

Guo

Withanage

Paudel

et al. 2020

J Supercond Nov Magn

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Magnesium diboride (MgB 2 ) is considered a potential material for superconducting radio frequency cavities. MgB 2 coated Cu cavity will allow for a higher operational temperature than a bulk Nb cavity because of the higher transition temperature of MgB 2 and the high thermal conductivity of Cu. Using the hybrid physical chemical vapor deposition technique, MgB 2 coatings were successfully achieved on the inner wall of 3-GHz Cu cavities. The surface and superconducting properties of the coatings were characterized using small samples on Cu plugs mounted at different locations of mock cavities. RF measurement of a MgB 2 coated single-cell 3-GHz test cavity was carried out and it showed superconducting transition at 36 K. The quality factor of this test cavity was lower than expected due to poor connectivity and inclusion of Mg-Cu alloy in the MgB 2 coating.

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Magnesium diboride on inner wall of copper tube: A test case for superconducting radio frequency cavities

Cited by 7 publications

References 11 publications

Current-phase relation in a short clean josephson junction model: application to MgB₂

Current-phase relation in a short clean josephson junction model: application to MgB₂

MgB₂thick films on three-dimensional structures fabricated by HPCVD

Fabrication and Radio Frequency Properties of 3-GHz SRF Cavities Coated with MgB2

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Magnesium diboride on inner wall of copper tube: A test case for superconducting radio frequency cavities

Cited by 7 publications

References 11 publications

Current-phase relation in a short clean josephson junction model: application to MgB2

Current-phase relation in a short clean josephson junction model: application to MgB2

MgB2thick films on three-dimensional structures fabricated by HPCVD

Fabrication and Radio Frequency Properties of 3-GHz SRF Cavities Coated with MgB2

Contact Info

Product

Resources

About

Current-phase relation in a short clean josephson junction model: application to MgB₂

Current-phase relation in a short clean josephson junction model: application to MgB₂

MgB₂thick films on three-dimensional structures fabricated by HPCVD