1. 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
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

2. 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

3. 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

4. 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

5. Commercial Small Solenoidal Coil 15 K target Operation

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

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

8. Actual Measured Results for Nb3Sn Undulator

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

10. 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 mm, 9 layers, number of turns = 60
Je=2950 A/mm2, 4.7 T

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

12. WIC and Coil Test
WIC Test
Coil Manufacture and Test

13. WIC NZP and Quench (gas cool)
NZP: cm/s

14. 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

15. 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

16. 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

17. 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

18. Ic Homogeniety Instrumentation: TempV1
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
Both V-wires soldered at same solder bead T3 T4 T6 T7 T8 T9 T5
T10
T11
TC-bead (uninsulated)
Gently scraped away WIC insulation
GE-varnish and thin cigarette paper insulation (1.27 μm thick)

19. 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 meters from the edge of CT1 going towards the winding

20. 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 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

21. NZP Instrumentation:V-taps
V23 is 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

22. 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)

23. 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

24. Inside of OSU Dewar
OSU Constructed YBCO Busbar

25. Closing up cryostat

26. Initial Coil Cool-down

27. Tc transition for coil
Tc = 39 K

28. Coil T Instrumentation /Result

29. 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

30. 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