A compact tokamak has

PHYSICS · Subjective · Fermi University Physics · Plasma Physics · Kinetic theory, collisions and transport · Fusion plasmas

Plasma Physics, Ch Transport across and along the field: ambipolar, classical, neoclassical and anomalous

Problem

A compact tokamak has, at its mid-radius, inverse aspect ratio

\epsilon = 0.25

and poloidal beta

\beta_p = 0.90

. Estimate the bootstrap current fraction using

\frac{I_{\rm bs}}{I_p} \sim \epsilon^{1/2}\beta_p,

and compare it with a quoted design value of

0.30

for the same device's inductive baseline scenario.