Low-Cost 2G HTS Coated Conductor Scale-Up at STI

Transcription

1 Low-Cost 2G HTS Coated Conductor Scale-Up at STI Jeong-Uk Huh, Jian Cao, Xiaofeng Qiu, Joseph Chase, Ken Pfeiffer STI Nexans University of Victoria Cambridge University Applied Superconductivity Conference Monday, August 11, 2014

2 Low-Cost HTS Coated Conductor Requirements INPUTS Low cost of raw materials o o Elemental source materials Inexpensive substrate material 2 3 PROCESS Low number of template buffer layers o Simple and repeatable 1 Low number of process steps per layer o High yield in each process High throughput and large HTS growth area EQUIPMENT Low production equipment cap-ex Simplified structure inherently reduces cost and also increases yield 2

3 Thicness (nm) Solution Deposition Planarization mm of width for processing Solution Deposition Planarization Production Line cm wide tape Tape Width (cm) Tape runs through multiple solution bathes and heater zones to get nanometer level Ra 100 mm wide tape in production: 1000 meter length - Slit 100 mm into various width based on customers request: 3 mm / 4 mm / 10 mm / 12 mm / 30 mm Thickness uniformity of width 96% - large process window with only 4% used for slitting of edges Production capacity is 1 km length at 1000 km/yr rate 3

4 Ion Beam Assisted Deposition Multi-lane multi-pass Upgrade IBAD Production Throughput Improvement In-situ IBAD and EPI MgO deposition in dual vacuum chamber Multi-lane multi-pass in both IBAD & EPI 10 times throughput improvement m/hr IBAD process capacity of 1 km length at 1000 km/yr rate matching SDP New feature: multi-lane RHEED 4

5 Reactive Coevaporation 100M System RCE 100M System Production Batch system capable of depositing ReBCO, optional buffer layer and silver Cyclic deposition and reaction on rotating drum Uses thermal evaporation sources for Rare earth, Barium, Copper, buffer material and silver Ability to optimize process for different superconducting applications: High Ic, High field or High Tc 5

6 Conductus TM Coated Conductor Data Over 500 A/cm for > 50 m Average Ic 590A 10 mm No significant dropouts 77K Self field Direct Ic measurement gives 674 A 12 mm width N-value of 36.8 Pilot run yields 100% of design capacity 500 A/cm achieved April 2014 Data provided by Nexans 6

7 Conductus TM Low Temperature Performance Data provided by University of Victoria Low temperature measurement shows high performance at 30K S.F. Characteristic of Standard STI Conductus TM Wire product A/cm at 77K and 840 A/cm at 65K for a 2.1 X lift factor A/cm at 25K for a 8.8 X lift factor 7

8 Conductus TM In-field Performance In-field performance Data provided by University of Victoria Conductus TM has intrinsic pinning - No extrinsic pinning elements added Shows both c and a,b - axis peaks under magnetic field 8

9 Conductus TM Hall Probe Scan Data provided by Cambridge University Field cooling magnetization and hall probe scans shows high symmetry Square shape tape (1 cm x 1 cm) was used for the scan at 77K Trapped field goes as high as 26 mt Symmetrical form of trapped field indicates high uniformity of tape 9

10 Testing - Handling & Tape Mechanical Stress 10mm wide 35 mm thick Cu-Electroplated Tape No Test Criteria Description I c -INITIAL (Amps) I c-final (Amps) Result 1 Twist 540 o /75cm CCW CW PASS 2 Film OUT Cold Cycle 3 Film IN Cold Cycle (9X) RT 77K (9X) RT 77K Thermal Cycling 50mm O.D. 2:1 Lay Length Thermal Cycling 50mm O.D. 2:1 Lay Length PASS PASS 4 Hot Soak RT Setpoint o C PASS 5 Bend Cycling (5X) 50mm O.D. Wrap cycling 6 Load Cycling (9X) 15lb load / 10mm wide tape PASS PASS 10

11 Tape Testing Tapestar XL TapeStar XL is installed and operational 1km reel-to-reel I c measure 200 meters/hr 1000A maximum I c 12mm 3mm width Tension controlled 700+m/hr. 11

12 RCE 1000M System Source Chamber Source Chamber from above Vacuum Dep Chamber RCE 1000M system scale-up progress Source chamber is installed; functioning and can be operated independently of vacuum deposition chamber The software control components have been calibrated and tested, meeting design specs The vacuum deposition chamber is nearing shipment from the supplier Production is scheduled for early Q annual capacity of 750 km/yr 12

13 Summary STI s Coated Conductor is inexpensive, high-yield, and scalable Our approach and HTS manufacturing experience can meet the demand for coated conductors and beat the industry cost targets 1000M SDP, IBAD Upgrade completed and 100M RCE system in production 100 mm wide and 1 km long SDP in production IBAD throughput improvement upgrade completed for production Achieved over 500A (590A average) for > 50M long tape Film shows high in-field, low temperature performance Copper plating process developed and tested 1000M RCE System is will be completed Q Source chamber is completed and deposition chamber will be finished in end of August System will be producing Conductus TM wire in Q km/yr of capacity when fully operational 13

14 Acknowledgements Direct Ic measurements provided by Nexans Low temperature in-field data provided by University of Victoria Hall probe scans provided by Cambridge University STI is in Booth 44 Taking Continuous Length Orders of Up to 1km NOW! Thank You 14