Determination of mechanical and thermal properties of electrical insulation material at 4.2 K

Weiss, Klaus-Peter; Westenfelder, S.; Jung, A.; Bagrets, N.; Fietz, W.H.

doi:10.1063/1.4712091

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The 45-K cryostat will be connected to both cold heads and will be supported via rods and disks (magenta and green colored pieces in Fig. 19) made of glass reinforced epoxy (G-10) [129].…”

Section: Cryostatmentioning

confidence: 99%

PUMA, antiProton unstable matter annihilation

Obertelli¹

2022

Eur. Phys. J. A

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PUMA, antiProton Unstable Matter Annihilation, is a nuclear-physics experiment at CERN aiming at probing the surface properties of stable and rare isotopes by use of low-energy antiprotons. Low-energy antiprotons offer a very unique sensitivity to the neutron and proton densities at the annihilation site, i.e. in the tail of the nuclear density. Today, no facility provides a collider of low-energy radioactive ions and low-energy antiprotons: while not being a collider experiment, PUMA aims at transporting one billion antiprotons from ELENA, the Extra-Low-ENergy Antiproton ring, to ISOLDE, the rare-isotope beam facility of CERN. PUMA will enable the capture of low-energy antiprotons by short-lived nuclei and the measurement of the emitted radiations. In this way, PUMA will give access to the so-far largely unexplored isospin composition of the nuclear-radial-density tail of radioactive nuclei. The motivations, concept and current status of the PUMA experiment are presented.

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“…The 45-K cryostat will be connected to both cold heads and will be supported via rods and disks (magenta and green colored pieces in Fig. 19) made of glass reinforced epoxy (G-10) [129].…”

Section: Cryostatmentioning

confidence: 99%

PUMA, antiProton unstable matter annihilation

Obertelli¹

2022

Eur. Phys. J. A

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“…In this orientation, tensile stresses above 24.8 MPa can lead to irreversible damage inside the superconducting REBCO layer [10]. This limit is below the adhesion of glues and resins on the tape surface [11][12][13]. With glues and resins, mismatches of the thermal expansions lead to high longitudinal and transverse stresses during cool-down.…”

Section: Relevance For Impregnation With Glues and Resinsmentioning

confidence: 99%

Degradation free epoxy impregnation of REBCO coils and cables

Barth¹,

Bagrets²,

Weiss³

et al. 2013

Supercond. Sci. Technol.

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In applications utilizing high-temperature superconductors (HTS) under high mechanical loads as high-field magnets or rotors of generators and motors, the rare-earth-barium-copper-oxide (REBCO) tapes have to be stabilized mechanically. This is achieved using support structures of structural materials and filling the voids in the support through the impregnation of the tapes. The impregnation prevents movement of the tapes and distributes mechanical loads evenly. With high mechanical strengths and low sensitivities to rapid temperature changes, epoxy resins are desired materials for the impregnation of superconductor tapes. However, a strong decrease of the current-carrying capabilities was observed in previous epoxy-impregnated REBCO coils. In this work the thermal expansion mismatches between epoxy resins and REBCO tapes are identified as the cause of these degradations. Fillers are used to reduce the thermal expansions of glues and resins. Mixtures with varying filler contents are analyzed systematically. Their thermal expansions and the corresponding degradations of short REBCO tape samples are measured. A mixture of epoxy resin and filler is found which allows degradation-free impregnation of REBCO tapes. This mixture is validated on a 1.2 m long 15 × 5 Roebel-assembled-coated-conductor (RACC) cable from Industrial Research Limited (IRL).

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“…Other potential applications for these composites are high-voltage switchgear, composite cylinders as an alternative to porcelain insulators, electrical insulation for superconducting magnets or magnetic components, etc. [2][3][4][5]. Recently, Volvo Car Corporation partnering with researchers from Imperial College London have developed a multifunctional structural composite material by combining carbon fibres, fibreglass, and a polymer resin for primarily using it as a car body structure and secondarily as a battery [6,7].…”

Section: Introductionmentioning

confidence: 99%

Glass Fibre Reinforced Epoxy Composites Modified with Graphene Nanofillers: Electrical Characterization

Bhanuprakash

Varghese

Singh

2022

Journal of Nanomaterials

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Composites with improved electrical properties created new pathways in electrical engineering industries. In this work, electrical studies conducted on continuous unidirectional E-glass fibre-reinforced epoxy composites modified with three different graphite oxide fillers are discussed. The three different fillers are (i) graphite oxide (GO), (ii) exfoliated graphite oxide (EGO), and (iii) reduced exfoliated graphite oxide (rEGO). Incorporation of GO fillers exhibited significant improvement in the dielectric characteristics of the composites, where it showed 42% enhancement in breakdown strength values. Dielectric constant measurements of GO-filled composites have also demonstrated considerable enhancement in the values where the fillers promoted interfacial and dipolar polarization phenomena in the material. On the other hand, in the case of EGO and rEGO fillers, conducting nature induced from graphitic structure had significantly reduced the dielectric properties of their composites.

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Determination of mechanical and thermal properties of electrical insulation material at 4.2 K

Cited by 5 publications

References 6 publications

PUMA, antiProton unstable matter annihilation

PUMA, antiProton unstable matter annihilation

Degradation free epoxy impregnation of REBCO coils and cables

Glass Fibre Reinforced Epoxy Composites Modified with Graphene Nanofillers: Electrical Characterization

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