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Test of QD0 Riccardo Musenich INFN-Genova

SuperB 2 nd Collaboration Meeting Frascati, December 13-16 2011. Test of QD0 Riccardo Musenich INFN-Genova. The test facility: Ma.Ri.S.A. Superconducting solenoid: Magnetic flux density (center) 6 T @ 1000 A Inductance 6.4 H Internal bore 0.50 m Heigth 0.62 m

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Test of QD0 Riccardo Musenich INFN-Genova

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  1. SuperB 2nd Collaboration Meeting Frascati, December 13-16 2011 Test of QD0 Riccardo Musenich INFN-Genova

  2. The test facility: Ma.Ri.S.A.

  3. Superconducting solenoid: • Magnetic flux density (center) 6 T @ 1000 A • Inductance 6.4 H • Internal bore 0.50 m • Heigth 0.62 m • Variable temperature cryostat: • Temperature range 4.2 – 30 K • Free bore 0.42 m

  4. Rj Lp Ls Lc Lp = 6.4 H; Lc = 340 µH; Ls = 90 µH QD0 Secondary Winding (10 turns)

  5. The use of the superconducting transformer allows reaching high current values (in the order of several tens of KA) without huge power supply and current leads. Moreover, as the amount of energy pumped in the sample is limited, it helps protecting the magnet in case of quench.

  6. To maximize the current transformer ratio Ls = 340 µH (20 turns) With 10 turns stored energy: 60% transformer ratio: 85% Ls = Lc Transformer Ratio Lc = 340 µH Ls = 90 µH Lc

  7. 10 turns wound with 2 NbTi wires in // H=38 mm = 400 mm QD0 Mechanical support (Al alloy) Secondary winding Hall probe holder Superconducting bus bars

  8. Current measurement: 2 Hall probes symmetrically positioned at 0.12 m from the secondary center Calibration of the Hall probes

  9. Quench protection If a quench is detected by the QDS, two capacitor banks are discharged on two groups of heaters (thin resistors placed on the secondary winding and on the magnet) in order dissipating the stored energy over the entire structure. joint quench heaters QDS secondary winding developing resistance joint

  10. Test of the secondary winding

  11. Test of the QD0 scheduled for next Tuesday

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