Formation of collisionless high-beta plasmas by application of odd-parity rotating magnetic fields
Abstract
Odd-parity rotating magnetic fields (RMFo) have been applied to mirror-configuration plasmas in a device of 4-cm radius, defined by discrete co-axial copper-ring flux conservers, and with divertor chambers beyond both mirrors. At an applied RF power of 10 kW and a bias field of 50 G, line-averaged electron density of 1e12 cm-3 and excluded flux of 0.005 mVs have been sustained for over 0.5 ms, corresponding to a Coulomb collisionality of < 0.02. The divertors allow reduction of the electron-neutral collision frequency to similarly low levels. Under such conditions, measurements of RMFo coupling indicate full penetration of the RMFo to the major axis.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2006
- Bibcode:
- 2006APS..DPPQO2008C