MAG5 5 T 006 D 001 Test on

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MAG-5. 5 -T 006 - D 001 Test on High-Current HTS cables D. S.

MAG-5. 5 -T 006 - D 001 Test on High-Current HTS cables D. S. Nickel, N. Bagrets, K. -P. Weiss INSTITUTE FOR TECHNICAL PHYSICS, FUSION MAGNETS 3 mm KIT – The Research University in the Helmholtz Association www. kit. edu

FBI – Repair and Upgrade - UPDATE Old current leads and wiring were removed

FBI – Repair and Upgrade - UPDATE Old current leads and wiring were removed New current leads were constructed, and prepared for installation Installation of current leads completed Sensor wiring in cryostat completed 95% of electronics finished Work in progress: Finalization of interconnection of electronics & software FBI facility is upgraded to offer additional measurement channels of low voltage signals 2 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Towards the triplet conductor testing HTS Cro. Co EU-CN Straight Sample Fusion relevant conditions:

Towards the triplet conductor testing HTS Cro. Co EU-CN Straight Sample Fusion relevant conditions: • Triplet configuration • Iop > 10 k. A @ B > 10 T • Top ≈ 4. 5 K 3 11. 02. 2020 Winding demonstrator Full-size coil Tests @ 77 K, investigating: • Lorentz-forces • bending radii Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Triplet transversal pressure testing Experimental setup Experimental conditions: T = 77 K Fmax =

Triplet transversal pressure testing Experimental setup Experimental conditions: T = 77 K Fmax = 100 k. N l, comp = 56. 7 mm 4 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Triplet transversal pressure testing Sample preparation HTS Cro. Co samples: Tapes by Shanghai Supercon.

Triplet transversal pressure testing Sample preparation HTS Cro. Co samples: Tapes by Shanghai Supercon. Techn. • • • 3 mm ST 1706 -07/08/12 and 1708 -09/13 2 mm ST 1706 -13/14 and 1708 -28 with intermediate Cu HTS Cro. Co triplet layouts: 5 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Triplet transversal pressure testing Results 1/2 T-II Critical load of Cro. Co 1 was

Triplet transversal pressure testing Results 1/2 T-II Critical load of Cro. Co 1 was increased by 350 % from 40 k. N/m to 180 k. N/m 6 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Triplet transversal pressure testing Results 2/2 T-III T-IV Critical load of Cro. Co 1

Triplet transversal pressure testing Results 2/2 T-III T-IV Critical load of Cro. Co 1 was increased by 110 % from 205 k. N/m to 430 k. N/m 7 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Triplet transversal pressure testing Post Mortem After the highest loads the triplet cross-sections reveal

Triplet transversal pressure testing Post Mortem After the highest loads the triplet cross-sections reveal massive damages in case of the samples T-I and T-III without Cu-envelope. T-III T-IV Obviously, the outer Cu-envelope reinforces the HTS Cro. Cos and allows the triplet to withstand higher forces. 8 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

Proposal 2020 Measurements considering bending and cyclic loading are necessary Minimizing the impact of

Proposal 2020 Measurements considering bending and cyclic loading are necessary Minimizing the impact of Lorentz forces - by using suitable copper profiles - each conductor is only loaded with his own Lorentz force - neighboring forces mitigated through the copper profiles Mechanical testing of solder to properly design triplet arrangements with conductors in profiles Tests on LTS-cable joints (SPC) Start: 01. 03. 2020 End: 31. 10. 2020 Resources: 0. 1 ppy 9 11. 02. 2020 Institute for Technical Physics D. S. Nickel, N. Bagrets, K. -P. Weiss

MAG5 3 T 016 Development of High CurrentMAG5 3 T 016 Development of High Current
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