DISCHARGE STARTUP AND EQUILIBRIUM IN A TOROIDAL EXTRAP PINCH
Experimental studies of a toroidal pinch discharge with a non-circular cross-section are described. The experiment was carried out on the Extrap T1 device which is the first fully toroidal experiment in the Extrap configuration and is the first where the discharge is induced. The non-circular cross-section is achieved by bounding the discharge by a magnetic separatrix due to the combined fields produced by external conductors and the plasma current. The techniques used to start the discharge and the discharge equilibrium parameters are presented. The major radius of the device is 0.45 m. Discharge currents of up to 40 kA have been achieved although most of the studies have been carried out with a current of 30 kA. The parameters of the discharge are in the Z-pinch regime and the average beta is about 40%. The discharge is globally stable for the 40 mus pulse length which is much longer than the 0.5 mus Alfv'en transit time.
Bibliographic Reference: REPORT TRITA-PFU12-87, AVAILABILITY: THE ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM
Record Number: 1989126086100 / Last updated on: 1989-05-01
Available languages: en