350-TON D-SHAPE TF COILS • Nb3Sn / REBCO HTS • ≤0.05% STRAIN LIMIT • 32-AXLE SPMT

350-Ton Superconducting D-Shape Toroidal Field Coil Transport Manual

Engineering execution standards for transporting 350-metric-ton superconducting tokamak magnetic field coils: asymmetric D-profile structural cradles, multi-channel fiber optic strain monitoring, and 32-axle SPMT hydraulic leveling.

Coil Mass
350 Metric Tons
771,600 Lbs Bare Mass
Superconductor Alloy
Nb3Sn • REBCO
11.8 Tesla Peak Magnetic Field
Max Permissible Strain
≤ 0.050% ε
Fiber Bragg Grating Sensors
Transporter Axle Lines
32 Axle Lines
4-File Coupled Hydraulic SPMT

1. Asymmetric D-Shape Structural Support Frame & Cradling

Toroidal field coils feature a tall, non-symmetrical D-shaped profile (typically 17m high × 9m wide). The straight inner leg contains the dense central solenoid mating casing, shifting the center of gravity far off-center compared to the rounded outer curve.

  • • Pre-Stressed Steel Shipping Frame: 65-ton modular box girder frame encasing the coil with micro-machined aluminum shims supporting the stainless steel casing at 16 perimeter bolsters.
  • • Horizontal Transport Pitch: The D-coil is transported at a 15-degree inclined tilt to clear highway bridge portals while keeping the center of gravity within the SPMT tipping triangle.
  • • Spherical Self-Aligning Thrust Washers: High-load spherical rocker plates under clamp studs absorb road torsion without transferring bending moments into the winding pack.

2. Fiber Optic Real-Time Strain & Cryo-Blanket Monitoring

Niobium-Tin (Nb3Sn) superconducting intermetallic compounds are extremely brittle. Bending strain exceeding 0.05% fractures the micro-filaments, causing irreversible loss of critical current density (Jc).

FBG Optical Sensor Array
48 Fiber Bragg Grating sensors embedded in conductor conduit jackets transmitting 1,000 samples/sec to in-cab telemetry with automatic audible alarms.
Dry Helium Gas Purge
Internal cooling channels continuously pressurized with Grade 5.0 helium at 2.0 PSIG to prevent atmospheric moisture contamination before reactor installation.

3. Multi-Axle SPMT 3-Point Hydraulic Equalization

Gross combination weight exceeds 480 tons (including shipping frame and bolsters). The transport platform utilizes a 4-file 32-axle SPMT configuration divided into three independent hydraulic suspension groups.

• Maximum axle point load limited to ≤15.0 tons to comply with AASHTO bridge stress criteria.
• Dynamic cross-leveling keeps the coil structure level within ±0.10 degrees during 6% roadway superelevation transitions.
• Dual hydraulic power packs (PPU) in synchronized master-slave mode for redundant propulsion.

Request Fusion Magnet Transport Plan

Engage Exspeedite specialized fusion logistics engineers for toroidal field coil moves and Tokamak site delivery.

Engineering Rigor:
• Finite Element Analysis (FEA) dynamic road bump models.
• Real-time fiber optic strain gauge telemetry.
• Multi-state police rolling roadblocks for 32-axle footprint.