A medium-sized 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

I_p = 1.5\,\mathrm{MA}

, toroidal field

B_0 = 2.0\,\mathrm{T}

, heating power

P = 5.0\,\mathrm{MW}

, line-averaged density

\bar n_{19} = 4.0

(density in units of

10^{19}\,\mathrm{m^{-3}}

), average ion mass

M = 2.0

(deuterium, in atomic mass units), major radius

R_0 = 1.67\,\mathrm{m}

, inverse aspect ratio

\epsilon = 0.35

, and elongation parameter

\kappa_a = 1.80

. Using the quoted IPB98(y,2) scaling

\tau_E = 0.0562\,I_p^{0.93}B_0^{0.15}P^{-0.69}\bar n_{19}^{0.41}M^{0.19}R_0^{1.97}\epsilon^{0.58}\kappa_a^{0.78}\ \mathrm{s},

with

I_p

in MA,

B_0

in T,

P

in MW and

R_0

in m, evaluate

\tau_E

term by term.