Plasma position control using microwave reflectometry at COMPASS
This unique experiment took place thanks to the collaboration between microwave groups from the
Instituto de Plasmas and Fusão Nuclear, Lisbon, Portugal and the Institute of Plasma Physics of
The Plasma Position Reflectometry (PPR) is perspective towards the future fusion devices.
Microwave reflectometer can withstand extreme radiative and thermal conditions better than
traditional magnetic diagnostics. These experiments are the continuation of previous work on the
ASDEX Upgrade tokamak, where the first plasma position reflectometry demonstrations were originally
Fig: At 1100 - 1200 ms, plasma shifted radially by 2 cm and back.
The plasma position is controlled by a signal from PPR (green). Measurements from magnetic
diagnostics (blue) show a good match of the actual and desired (black) position of the plasma