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Pier Paolo Granieri, TE-CRG

Collimation Upgrade Specification Meeting #35 21 st March, 2014. Pier Paolo Granieri, TE-CRG. S teady -state cable quench limits of the 11 T dipole. Roadmap. Today’s presentation , using available data. Steady-state quench limits can be a conservative limit.

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Pier Paolo Granieri, TE-CRG

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  1. Collimation Upgrade Specification Meeting #35 21st March, 2014 Pier Paolo Granieri, TE-CRG Steady-state cablequench limits of the 11 T dipole

  2. Roadmap Today’spresentation, usingavailable data Steady-statequenchlimits • canbe a conservative limit by means of simulation codes: Transientquenchlimits P.P. Granieri – Steady-state cablequenchlimits of the 11 T dipole Experimentalmeasurements of steady-stateheat extraction

  3. Steady-state heat extraction Tc (mid-plane, cable center) Tc (mid-plane, cableedge) Different position in the cable, Tbath, heating configuration : N.B. Heattransfermechanisms in Nb3Sn coils are muchsimplerthan in the current LHC Nb-Ticoils P.P. Granieri – Steady-state cablequenchlimits of the 11 T dipole Measurementsperformed in 2012, for the Nb3Sn MQXF magnet • differentelectricalinsulation, w/o mica glass • unreactedcable (effects on fiberglass thermal conductivity ?)

  4. Steady-statecablequenchlimits P.P. Granieri – Steady-state cablequenchlimits of the 11 T dipole Calculatedassuming the followinghypotheses: • nominal operating conditions • availableheattransfer data (MQXF, seeprevious slide) • fieldmap of the 11 T 1-in-1 demonstrator (around 10% optimistic)

  5. Follow-up To beperformedusing the 11 T (reacted) cable-typenextdays Steady-statequenchlimits • canbe a conservative limit by means of simulation codes: Transientquenchlimits P.P. Granieri – Steady-state cablequenchlimits of the 11 T dipole Experimentalmeasurements of steady-stateheat extraction

  6. Conclusion P.P. Granieri – Steady-state cablequenchlimits of the 11 T dipole • Steady-stateheat extraction determined for a Nb3Sn cable, similar but not equal to the 11 T one • Withthisassumption, cablequenchlimitaround110 mW/cm3 • steady-state (conservative, 20% ?) • uniformheatdeposit over cable cross-section • Measurement of the actual 11 T cablesoonavailable  update of the quenchlimitcalculation

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