A Dimensionally Exact Tokamak Confinement Scaling Law Derived From 14,153 Multi-Machine Plasma Discharges

We present a dimensionally exact scaling law for tokamak energy confinement time that achieves
R^2 = 0.957 on 2,000 plasma discharges from the ITPA Global H-mode Confinement Database (HDB5
v2.3), validated on a 500-discharge holdout set drawn from 19 different tokamaks worldwide.