Data sources

🎯 Objective

• Test whether two independently powered concentric HTS coils (2 m + 3 m tape) perform better than a single 5 m coil.
• Investigate if strategic powering (outer → inner → outer) allows operation closer to each coil’s critical current by reducing local magnetic field exposure.
• Evaluate whether this configuration leads to higher achievable field or improved current sharing.

📐 Coil Setup

• Inner coil: 2 m HTS tape, wound on 8 mm mandrel → Mgn_012
• Outer coil: 3 m HTS tape, wound on 22 mm mandrel → Mgn_011
• Total length = 5 m, same as single benchmark coil → Mgn_004, Mgn_005

📊 Results

• Maximum field observed: ~1.2 T, same as single 5 m coil On 10mm mandrel!.
• No significant improvement in field strength or distribution with concentric powering.
• Likely reason: magnetic fields are still too low to benefit from mutual field management.
• At ~1.2 T, HTS tape is still operating in a flat Ic(B) region → field reduction has little impact on critical current.

🏹 Next Steps

• Perhaps try with larger outer coil and inner coil so that we have bigger more impactful magnetic fields.