Superconducting Coils for Application M.D. Sumption, M. Majoros, Y Yang, M. Susner, C. Myers, C. Kovacs, E.W. Collings Center for Superconducting and Magnetic Materials, MSE, The Ohio State University For US-Japan Workshop Dayton OH July 10-12 2013 Funded by a the state of Ohio, NIH, commercial sources, and several DOE SBIRs M. A. Rindfleisch, X. Peng, M. J. Tomsic, C. J. Thong, D. Doll, HyperTech Research

B z-axis SuTC-Magnets Small Scale Model Undulator for International Linear Collider Rotor coil for NASA MgB2 small scale MRI model (left) and solenoid coil (right) Coil Winding: HTR Coil Instrument and Test- OSU

Selected Previous Coils Small Solenoids, MgB2 (to 850 m of wire) Small Racetracks, MgB2 Rotor Coil, MgB2 Wind and React “segmented coil” seg Undulator Coil, MgB2 Solenoid and Undulator Coil Nb3Sn Also series of small YBCO coils – Ic, thermal Propagation and NZP

Outline of Present Work Small 15 K Coil, MgB2 E-lenz Coil, HTR, BNL Model Helical and Planar Undulators – Nb3Sn Wire-In-channel Development and NZP Estimation – MgB2 100 m length of MgB2 instrumented (MRI-like Coil Winding, but one layer) for Thermal, Ic, and NZP measurement

Commercial Small Solenoidal Coil 15 K target Operation

MgB2 based Coil Development for E-Lenz, Hyper Tech and BNL

Helical Undulator – ILC-like Majoros On-Axis field = 0.8 T

Actual Measured Results for Nb3Sn Undulator

Pushing for higher freq. in ILC-like Helical Undulators Pushing to 11 -12 mm requires 1 T Pushing to 10 mm requires 1.07 T (Assuming K = 1)

Needs for Planar Undulators Conductor: Nb3Sn tube-type 192 filament strand, 0.5 mm OD (not insulated), 0.65 mm OD (insulated) Winding cross-section:, winding size 4.8 mm x 5.458 mm, 9 layers, number of turns = 60 Je=2950 A/mm2, 4.7 T

Results: Planar Undulator segment At maximum quench current of 357.3 A obtained experimentally, the corresponding maximum on-axis field is 1.6 T.

WIC and Coil Test WIC Test Coil Manufacture and Test

WIC NZP and Quench (gas cool) NZP: 0.5-1 cm/s

MgB2 Coil, 100 m of WIC MgB2 Conductor HTR: MgB2 strand, Wire-in-channel Conductor HTR: Coil wound, coil epoxy impregnated by HTR OSU: Coil Instrumented with 30+ voltage taps, 18+ thermocouples, , other sensors OSU: Cool down and Test

Rough Schematic Single Layer, 34-Turn (~100m) WIC MgB2 Coil Current-Tap 1 (CT1) Cu-Stabilized YBCO Extensions to BSCCO-Leads Current-Tap 2 (CT2) Winding Height= 92mm Single Layer, 34-Turn (~100m) WIC MgB2 Coil

Instrumentation V-tap wires: (MWS) 30HPN-155, insulated copper wire. Thermocouples: (Omega) 5LRTC-KK-E-24-48, Type-E. Heaters: (Birk) BK3542, Kapton-insulated Nichrome heater. The heater active areas were double the width of the WIC so they were folded over. V-Tap wires run along coil turns, then twisted off as V-tap pair to minimize inductive signal

Ic Homogeniety Instrumentation: V-taps V2/V3 V4/V5 V6/V7 V8/V9 V10/V11 V12/V13 V14/V15 V16/V17 V18/V19 V20/V21 V22 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 CT1 CT2 Name Distance from edge of CT1 going towards winding (m) Description V1 -0.09 Soldered onto WIC on CT1 V2/V3 0.021 Both V-wires soldered at same solder bead V4/V5 17.246 V6/V7 25.865 V8//V9 34.484 V10//V11 43.103 V12/V13 51.722 V14//V15 60.341 V16//V17 68.96 V18//V19 77.579 V20//V21 95.972 V22 96.26 Soldered onto WIC on CT2 Note: V1 & V2 are a voltage tap pair (shown by twisted wires). V2/V3 only refers to the fact that both of these wires are soldered to the sample at the same location

Ic Homogeniety Instrumentation: Temp V1 V2/V3 V4/V5 V6/V7 V8/V9 V10/V11 V12/V13 V14/V15 V16/V17 V18/V19 V20/V21 V22 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 CT1 CT2 Name Distance from edge of CT1 going towards winding (m) Description T1 0.018 Soldered onto WIC on CT1 T2 861.268 Both V-wires soldered at same solder bead T3 2154.118 T4 3016.018 T6 3877.918 T7 4739.818 T8 5601.718 T9 6463.618 T5 7325.518 T10 8676.118 T11 9595.868 TC-bead (uninsulated) Gently scraped away WIC insulation GE-varnish and thin cigarette paper insulation (1.27 μm thick)

NZP Instrumentation: V-taps, T, Heaters V2/V3 V4/V5 V6/V7 V8/V9 V10/V11 V12/V13 V14/V15 V16/V17 V18/V19 V20/V21 V22 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 CT1 CT2 Located between V11 & V12 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22 T23 T24 T25 T26 V23 V24/25 V26/27 V28/29 V30/31 V32/33 V34/35 V36/37 V38/39 V40/41 V42/43 V44 A1 A2 A3 A4 A5 A6 A7 A8 H1 H2 CT1 CT2 A1-8 V-taps & T13,14,25,26 TCs are on the nearest neighbor turns to witness possibility of transverse NZP V23 is 47.272 meters from the edge of CT1 going towards the winding

NZP Instrumentation: Heaters V23 V24/25 V26/27 V28/29 V30/31 V32/33 V34/35 V36/37 V38/39 V40/41 V42/43 V44 A1 A2 A3 A4 A5 A6 A7 A8 H1 H2 V23 is 47.272 meters from the edge of CT1 going towards the winding CT1 CT2 Name Distance from V23 (cm) Description H1 0.7 Measured from center of active area H2 38.1 Note: the closest distance of the active areas of the heaters H1 to H2 is 36.8cm. 6mm Folded in half 3mm Making Kapton-insulated nichrome heater correct width = Active Area The “true” active width (the nichrome wire) was 4.49mm and ~2.3mm after folding

NZP Instrumentation:V-taps V23 is 47.272 meters from the edge of CT1 going towards the winding T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22 T23 T24 T25 T26 V23 V24/25 V26/27 V28/29 V30/31 V32/33 V34/35 V36/37 V38/39 V40/41 V42/43 V44 A1 A2 A3 A4 A5 A6 A7 A8 H1 H2 CT1 CT2 Name Distance from V23 (cm) Description V23 V24/V25 3.3 Both V-wires soldered at same solder bead V26/V27 8.5 V28/V29 9.5 V30//V31 14.5 V32//V33 15.3 V34/V35 25.1 V36//V37 26.1 V38//V39 30.5 V40//V41 31.5 V42//V43 37.5 V44 41.2 Note: V23 & V24 are a voltage tap pair (shown by twisted wires). V24/25 only refers to the fact that both of these wires are soldered to the sample at the same location Note: A1-8 voltage taps are shown in another NZP instrumentation diagram

NZP Instrumentation: Thermocouples V23 V24/25 V26/27 V28/29 V30/31 V32/33 V34/35 V36/37 V38/39 V40/41 V42/43 V44 A1 A2 A3 A4 A5 A6 A7 A8 H1 H2 CT1 CT2 Name Distance from V23 (cm) Description T12 0.7 T13 - Shown in other diagram T14 T15 5.9 Shorted to sample (unusable) T16 9 T17 12 T18 14.9 T19 20.2 T20 25.6 T21 28.3 T22 31 T23 34.5 T24 38.1 T25 T26 Note: T13,14,25,26 thermocouples are shown in another NZP instrumentation diagram TC-bead (uninsulated) Gently scraped away WIC insulation GE-varnish and thin cigarette paper insulation (1.27 μm thick)

NZP Instrumentation: Neighboring Strands V23 V24/25 V26/27 V28/29 V30/31 V32/33 V34/35 V36/37 V38/39 V40/41 V42/43 V44 A1 A2 A3 A4 A5 A6 A7 A8 H1 H2 CT1 CT2 Name Longitudinal Distance from V23 (cm) Description A1 -3.05 A2 4.45 A3 A4 A5 34.35 A6 41.85 A7 A8 T13 0.7 T14 T25 38.1 T26 Transverse distance of the neighboring taps/TCs to the center of the main strand is ~2.4mm

Inside of OSU Dewar OSU Constructed YBCO Busbar

Closing up cryostat

Initial Coil Cool-down

Tc transition for coil Tc = 39 K

Coil T Instrumentation /Result

OSU Coil Test Bed – Test of Coil Cryocooled Test Bed capable of cooling coil 4’ OD by 2’ high to 4 K Two Sumitomo Cryocoolers 700 A Current lead DC Labview controlled DC or AC Coil being tested with active protection circuits on 10 segments Possible to use voltage control 63 KVA PS Cryostat 2ft x 4 ft Coil Xfrm (2 kA) Test Bed

Summary Coils of various kinds have been made, including Solenoids, pancakes, segmented coils, model helical undulators, Fault current limiting coils, Model coil set for planar undulators, rotor coils, and others Coils have been made with MgB2, YBCO, Nb3Sn Coils are bring developed for operation at 4 K, higher temperature, liquid helium, cryocooled, and intended for 20 K helium waste gas cooling A wire in channel has been developed, and quench properties have been evaluated A coil has been wound with this WIC, and is being tested presently