Accelerating Applications of RF Superconductivity—Success Stories

Padamsee, H.

doi:10.1109/tasc.2005.847473

Cited by 20 publications

(10 citation statements)

References 7 publications

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“…The result is promising for using The acceleration gradient of superconducting radio frequency (SRF) cavities, in which the RF magnetic field is parallel to the superconductor surface, is limited by the thermodynamic critical field H c of the superconductor. 1 SRF cavities made of niobium (transition temperature T c = 9.2 K and H c ∼ 1900 Oe) have been perfected such that their accelerating gradient is close to the material's theoretical limit. 2,3 Magnesium diboride (MgB 2 ) is a promising alternative to Nb for future SRF cavities.…”

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confidence: 99%

Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB2 thin films

et al. 2015

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For potential applications in superconducting RF cavities, we have investigated the properties of polycrystalline MgB2 films, including the thickness dependence of the lower critical field Hc1. MgB2 thin films were fabricated by hybrid physical-chemical vapor deposition on (0001) SiC substrate either directly (for epitaxial films) or with a MgO buffer layer (for polycrystalline films). When the film thickness decreased from 300 nm to 100 nm, Hc1 at 5 K increased from around 600 Oe to 1880 Oe in epitaxial films and to 1520 Oe in polycrystalline films. The result is promising for using MgB2/MgO multilayers to enhance the vortex penetration field.

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confidence: 99%

Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB2 thin films

et al. 2015

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“…Superconducting radio frequency (SRF) cavities provide energy to the particles in high energy particle accelerators. Continuing efforts in terms of fabrication technique are ongoing to improve cavity performance and achieve the needed high accelerating gradients and quality factors [1][2][3]. Electron-beam (EB) welding is the most common and well-established technique for the fabrication of multi-celled cavities.…”

Section: Fabrication Of Superconducting Rf Cavitiesmentioning

confidence: 99%

Development of a multi-scale simulation model of tube hydroforming for superconducting RF cavities

Kim

Sumption

Bong

et al. 2017

Materials Science and Engineering: A

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This work focuses on finite element modeling of the hydroforming process for niobium tubes intended for use in superconducting radio frequency (SRF) cavities. The hydroforming of tubular samples into SRF-relevant shapes involves the complex geometries and loading conditions which develop during the deformation, as well as anisotropic materials properties. Numerical description of the process entails relatively complex numerical simulations. A crystal plasticity (CP) model was constructed that included the evolution of crystallographic orientation during deformation as well as the anisotropy of tubes in all directions and loading conditions. In this work we demonstrate a multi-scale simulation approach which uses both microscopic CP and macroscopic continuum models. In this approach a CP model (developed and implemented into ABAQUS using UMAT) was used for determining the flow stress curve only under bi-axial loading in order to reduce the computing time. The texture of the materials obtained using orientation imaging microscopy (OIM) and tensile test data were inputs for this model. Continuum FE analysis of tube hydroforming using the obtained constitutive equation from the CP modeling was then performed and compared to the results of hydraulic bulge testing. The results show that high quality predictions of the deformation under hydroforming of Nb tubes can be obtained using CP-FEM based on their known texture and the results of tensile tests. The importance of the CP

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“…TESLA-type [1] superconducting (Sc) accelerating cavities have been in development for over ten years [2][3][4][5][6]. Increased accelerating field gradients have been obtained due to improvements in cavity fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

Development of high resolution camera for observations of superconducting cavities

Iwashita

Tajima

Hayano

2008

Phys. Rev. ST Accel. Beams

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A system for inspecting the inner surface of superconducting rf cavities is developed in order to study the relation between the achievable field gradient and the defects in the inner surface. The inspection system consists of a high resolution complementary metal-oxide-semiconductor camera and a special illumination system built in a cylinder that has a diameter of 50 mm. The camera cylinder can be inserted into the L-band 9 cell superconducting cavity. The system provides a resolution of about 7:5 m=pixel. Thus far, there have been good correlations between locations identified by thermometry measurements and positions of defects found by this system. The heights or depths of the defects can also be estimated by measuring wall gradients using the reflection angle relation between the camera position and the strip illumination position. This paper presents a detailed description of the system and the data obtained from it.

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Accelerating Applications of RF Superconductivity—Success Stories

Cited by 20 publications

References 7 publications

Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB2 thin films

Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB2 thin films

Development of a multi-scale simulation model of tube hydroforming for superconducting RF cavities

Development of high resolution camera for observations of superconducting cavities

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