Small-Scale Magnetic Fluctuations Inside the Macrotor Tokamak

Magnetic pickup loops inserted into the Macrotor tokamak have shown a broad spectrum of oscillation in $B_r$ and $B_p$ up to $f\approx 100$ kHz. The high-frequency ${\tilde{B}}_r$ have short radial and poloidal correlation lengths $L<\mathrm{}5\mathrm{}$ cm, in contrast with the usual Mirnov oscillations with $f\approx 7$ kHz and $L\gg 5$ cm. The observed magnitude $\frac{\Sigma \left|{\tilde{B}}_r\right|}{B_T}>{10}^{-5\mathrm{}}$, where the summation extends over all $f>\mathrm{}30\mathrm{}$ kHz, is in the range in which such radial magnetic perturbations may be contributing to anomalous electron energy transport.