Properties of superfluid turbulence in a large channel

Pulsed-ion techniques are used in a 1-cm × 2.3-cm channel to obtain the first spatially resolved measurements of the vortex-line length-density distribution and the normal-fluid velocity field in turbulent counterflow. Also, an upper limit to the structural anisotropy of the vortex tangle is obtained which contradicts earlier claims. © 1984 The American Physical Society.