PLASMA FILAMENTATION IN THE RIJNHUIZEN-TOKAMAK RTP

Evidence for small scale magnetic structures in the Rijnhuizen tokamak RTP is presented. These are manifest through steps and peaks in the e lectron temperature and pressure, measured with multiposition Thomson scattering. During central electron cyclotron heating, several filamen ts of high pressure are found in the power deposition region. They liv e hundreds of microseconds. Near the sawtooth inversion radius a ''ste p'' in the temperature profile occurs. Further out, quasiperiodic stru ctures are observed, in both Ohmic and heated discharges.