Control of the current density profile with lower hybrid current drive on PBX-M
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- California Univ., Los Angeles, CA (United States). Inst. of Plasma and Fusion Research
- Oak Ridge National Lab., TN (United States)
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
- Fusion Physics and Technology, Torrance, CA (United States)
- JET Joint Undertaking, Abingdon (United Kingdom)
Lower hybrid current drive (LHCD) is being explored as a means to control the current density profile on PBX-M with the goal of raising the central safety factor q(O) to values of 1.5-2 to facilitate access to a full-volume second stable regime. Initial experiments have been conducted with up to 400 kW of 4.6 GHz LH power in circular and indented plasmas with modest parameters. A tangential-viewing two-dimensional hard x-ray imaging diagnostic has been used to observe the bremsstrahlung emission from the suprathermal electrons generated during LHCD. Hollow hard x-ray images have indicated off-axis localization of the driven current. A serious obstacle to the control of the current density profile with LHCD is the concomitant generation of MHD activity, which can seriously degrade the confinement of suprathermal electrons. By combining neutral beam injection with LHCD, an MHD-free condition has been obtained where q(O) is raised above 1.
- Research Organization:
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10173197
- Report Number(s):
- PPPL-2925; CONF-9304112-20; ON: DE93017518
- Resource Relation:
- Conference: 10. topical conference on radio frequency power in plasmas,Boston, MA (United States),1-3 Apr 1993; Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
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