TIME AND ENERGY RESOLVED MEASUREMENTS OF RADIOACTIVITY INDUCED BY RUNAWAY ELECTRONS IN A TOKAMAK
Runaway electrons are often produced in tokamaks. They are obvious tracers of the magnetic structure, especially of magnetic turbulence which probably determines anomalous transport. Time- and energy resolved measurements of runaway induced radioactivity have been done using a pneumatic shuttle carrying samples between the tokamak and a Ge(Li) diode. The deactivation spectrum of a sample irradiated near the plasma can be measured immediately after the shot. Energy resolution is obtained using in a given sample several elements with different energy thresholds for photonuclear reactions. A parametric study using this apparatus has been done on TFR. A striking result is that magnetic turbulence is 10 times more efficient at low (3 T) toroidal field than at higher (4 T) field.
Bibliographic Reference: NUCLEAR INSTRUMENTS AND METHODS, VOL. 215 (1983), PP. 453-461
Record Number: 1989123120800 / Last updated on: 1987-01-01
Available languages: fr