Heat transport in PBX-M high {beta}{sub p} plasmas
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Japan Atomic Energy Research Inst., Tokai, Ibaraki, Naka (Japan)
- Laboratoire pour l`Armement, Bernes (Switzerland)
- Grumman Aerospace Corp., Bethpage, NY (United States)
- ARACOR, Sunnyvale, CA (United States)
- Fusion Physics and Technologies, Torrance, CA (United States)
PBX-M high beta poloidal discharges routinely transition into the H-mode regime: typically, a quiescent phase followed by an MHD active phase characterize the H-mode period. An analysis of the energy transport during these phases is conducted using the experimental data and the TRANSP code; effective diffusivities are computed to quantify the energy transport of the thermal component of the plasma. Compared to the L-mode, the quiescent H-phase is characterized by a decrease of the thermal ion energy transport and a flattening of the associated effective diffusivity profile. An error analysis is presented. Enhanced fast-ion losses are observed during the MHD active phase: particles in the lower end of the fast-ion energy spectrum with large perpendicular velocity component are predominantly affected. These losses must be taken into account in the analysis in order to reproduce the measured stored energy and time evolution of the neutron production rate during the MHD active phase.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10142751
- Report Number(s):
- PPPL-2840; ON: DE92013248
- Resource Relation:
- Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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