Fluctuations in high {beta}{sub p} plasmas in DIII-D
- Lawrence Livermore National Lab., CA (United States)
- General Atomics, San Diego, CA (United States); and others
In our investigation of improved confinement in high poloidal beta ({beta}{sub p}= 2 to 4) advanced tokamak experiments, we observe that the internal MHD activity evolves from an m/n = 2/1 to a 3/1 structure coincident with q{sub o} rising above 2, and consistent with the GATO code stability analysis. The plasma eventually evolves to a quiescent state at which time the stored energy increases, mostly as a result of improved particle confinement. The bootstrap fraction rises to 80%. The measured plasma pressure profiles during this time are calculated to be stable to high-n ballooning modes consistent with operation of the core in the second stable regime. The sustained improvement in confinement is ultimately limited by our ability to control the toroidal current profile.
- Research Organization:
- General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; W-7405-ENG-48
- OSTI ID:
- 10176589
- Report Number(s):
- GA-A-21750; CONF-940635-10; ON: DE94017510; BR: 35AT10020/35KC07000
- Resource Relation:
- Conference: European conference on controlled fusion and plasma physics,Marseilles (France),26 Jun - 1 Jul 1994; Other Information: PBD: Jul 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
q Profile evolution and enhanced core confinement of high {beta}{sub p} plasmas in DIII-D
Optimized profiles for improved confinement and stability in the DIII-D tokamak