Test of QD0 Riccardo Musenich INFN-Genova SuperB 2 nd Collaboration Meeting Frascati, December

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 The test facility: Ma.Ri.S.A.

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 Superconducting solenoid: Magnetic flux density (center) A Inductance6.4 H Internal bore0.50 m Heigth0.62 m Variable temperature cryostat: Temperature range4.2 – 30 K Free bore0.42 m

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 LcLc LsLs LpLp RjRj QD0 Secondary Winding (10 turns) L p = 6.4 H; L c = 340 µH; L s = 90 µH

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 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.

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 L c = 340 µH L s = 90 µH LcLc L s = L c Transformer Ratio To maximize the current transformer ratio L s = 340 µH (20 turns) With 10 turns stored energy: 60% transformer ratio: 85%

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 Superconducting bus bars Hall probe holder Secondary winding Mechanical support (Al alloy) QD0 10 turns wound with 2 NbTi wires in // H=38 mm = 400 mm

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 Current measurement: 2 Hall probes symmetrically positioned at 0.12 m from the secondary center Calibration of the Hall probes

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 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. QDS secondary winding developing resistance quench heaters joint

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 Test of the secondary winding

SuperB 2 nd Collaboration Meeting – Frascati, December 2011 Riccardo Musenich Test of QD0 Test of the QD0 scheduled for next Tuesday