Fermilab-built SSC collider dipoles using low temperature curing insulation systems with and without glass tape

Jaffery, T.S.; Coombes, R.; Devred, A.; DiMarco, J.; Ogitsu, T.; Sims, R.; Tompkins, J.; Wake, M.; Bossert, R.; Carson, J.; Delchamps, S.; Gonczy, I.; Gourlay, S.A.; Hanft, R.; Lamm, M.J.; Mazur, Péter; Orris, D.; Strait, J.

doi:10.1109/pac.1993.309455

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…1, is the result of work started in the early 70's for the ISR [3], passing through SSC [4], HERA [5] and RHIC [6]. It consists of polyimide tapes arranged in layers helically wound around the cable.…”

Section: State-of-the-art All-polyimide Insulationmentioning

confidence: 99%

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

China

Tommasini

2008

IEEE Trans. Appl. Supercond.

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Abstract-In superconducting magnets operating at high heat loads as the ones for interaction region of particle colliders or for fast cycling synchrotrons, the limited heat transfer capability of state-of-the-art electrical insulation may constitute a heavy limitation to performance. In the LHC main magnets, Nb-Ti epoxy-free insulation, composed of polyimide tapes, has proved to be permeable to superfluid helium, however the heat flux is rather limited.After a review of the standard insulation scheme for Nb-Ti and of the associated heat transfer mechanisms, we show the existence of a large margin available to improve insulation permeability. We propose a possible way to profit of such a margin in order to increase significantly the maximum heat flux drainable from an all polyimide insulated Nb-Ti coil, as it is used in modern accelerator magnets.

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Section: State-of-the-art All-polyimide Insulationmentioning

confidence: 99%

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

China

Tommasini

2008

IEEE Trans. Appl. Supercond.

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“…In the Nb-Ti conductors constituting the main magnets of the Large Hadron Collider (LHC), the choice of superfluid helium (He II) coolant and of a porous insulation scheme allowed improving the heat transfer [3] with respect to sealed insulation schemes as that of the Superconducting Super Collider [4]. In case of the foreseen High Luminosity LHC (HL-LHC) upgrade, the required magnets will have to withstand larger heat loads than in the current LHC operation [5].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer through cable insulation of Nb–Ti superconducting magnets operating in He II

Granieri¹

2013

Cryogenics

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a b s t r a c tThe operation of Nb-Ti superconducting magnets in He II relies on superfluidity to overcome the severe thermal barrier represented by the cable electrical insulation. In wrapped cable insulations, like those used for the main magnets of the Large Hadron Collider (LHC) particle accelerator, the micro-channels network created by the insulation wrappings allows to efficiently transfer the heat deposited or generated in the cable to the He bath.In this paper, available experimental data of heat transfer through polyimide electrical insulation schemes are analyzed. A steady-state thermal model is developed to describe the insulation of the LHC main dipole magnets and the Enhanced Insulation proposed for the High Luminosity LHC upgrade (HL-LHC), according to the relevant geometric parameters. The model is based on the coupled mechanisms of heat transfer through the bulk of the dielectric insulation and through micro-channels between the insulation tapes.A good agreement is found between calculations and tests performed at different applied pressures and heating configurations. The model allows identifying the heat fluxes in the cable cross-section as well as the dimensions of the micro-channels. These dimensions are confirmed by microscope images of the two insulations schemes.

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Fermilab-built SSC collider dipoles using low temperature curing insulation systems with and without glass tape

Cited by 2 publications

References 6 publications

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

Heat transfer through cable insulation of Nb–Ti superconducting magnets operating in He II

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