New measurements of magnetic fields, pressure and velocity at the Riga dynamo experiment

In May 2004, the sixth experimental campaign has been carried out at the Riga dynamo facility. Besides the refined magnetic field measurements, we present pressure data recorded in the innermost cylinder and the first successful measurement of velocities in the outermost cylinder by ultrasonic Doppler velocimetry (UDV). The pressure data exhibit clear signals of the double and quadruple of the magnetic eigenmode frequency. The velocity UDV measurements confirm the numerical prediction that the Lorentz forces produce a global rotation and a double poloidal vortex in the outermost cylinder. We comment also on the demands and the prospects for future experimental campaigns.