INTERACTIVE FUSION MAGNET CALCULATOR • ASYMMETRIC CENTROID • SPMT STABILITY

Tokamak D-Coil Center-of-Gravity & Quench Calculator

Calculate the true 3D neutral axis and center-of-gravity offset for asymmetric D-shaped fusion TF magnets, verify SPMT hydraulic 3-point/4-point axle line pressure limits, and evaluate cryo-quench boil-off pressure relief margin.

Coil & Rig Parameters

350 tons

Includes winding pack, structural steel case, cryostat wrapper, and transit skid.

14.0 m

Vertical inboard vault boundary facing central solenoid.

9.0 m

Maximum outboard curvature apex from straight inner centerline.

3.5%

Maximum crown, banking superelevation, or shoulder dip along permit route.

Live Calculated Telemetry & Axle Equalization

OPTIMAL • 100% BALANCED
CoG Outboard Offset
3.42 m
From Straight Leg
Axle Line Load
10.94 t
<16.5 t Limit (Safe)
Roll Overturning Margin
2.84x
Camber Safety Factor
Max Allowable G-Force
0.24 g
Lateral Acceleration

Hydraulic Suspension Balancing Analysis Hydraulic Stroke: 300 mm Nominal

Inboard Straight Leg Group 41.2% (144.2 t)
Outboard Curved D-Arc Group 58.8% (205.8 t)
Vent Capacity: 450 Nm³/hr @ 2.5 bar
Boil-off Hold Time: 120 Hours (Safe)
Conductor Integrity Rule: Superconducting coils wrapped with brittle Nb3Sn intermetallics or REBCO tapes cannot withstand uneven torsion across the structural casing. The SPMT hydraulic circuit must maintain pressure differential between outboard and inboard groups within ±4.5% to prevent exceeding the ≤0.05% tensile/shear strain safety boundary.
01

Neutral Axis Offset

Unlike symmetrical circular solenoid coils, tokamak toroidal field coils feature an extended straight inboard leg and an asymmetric outer D-arc designed to equalize magnetic hoop stresses. In transport, this shifts the geometric CoG significantly toward the curved arc, necessitating custom lateral skid offset placement.

02

3-Point Hydraulic Equalization

Multi-axle SPMT transporters are configured in 3-point hydraulic groups (two oscillating rear quadrants and one consolidated forward apex) to ensure statically determinate load sharing. Even when transitioning over 6% highway superelevation, no single tire exceeds 8,250 kg.

03

Cryogenic Boil-Off Dynamics

Cold-transport skids holding sub-cooled liquid nitrogen (77K) or supercritical helium (4.2K) generate continuous boil-off vapors under road vibration. Dual ASME certified relief valves prevent over-pressurization while redundant catalytic vent stacks disperse vapor safely away from escort convoys.

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