A method for measuring the inductive electric field profile and noninductive current profiles on DIII-D
Conference
·
OSTI ID:10173534
- General Atomics, San Diego, CA (United States)
- Oak Ridge Inst. for Science and Education, TN (United States)
- Lawrence Livermore National Lab., CA (United States)
A new technique for determining the parallel electric field profile and noninductive current profile in tokamak plasmas has been developed and applied to two DIII-D tokamak discharges. Central to this technique is the determination of the current density profile, J({rho}), and poloidal flux, {psi}({rho}), from equilibrium reconstructions. From time sequences of the reconstructions, the flux surface averaged, parallel electric field can be estimated from appropriate derivatives of the poloidal flux. With a model for the conductivity and measurements of T{sub e} and Z{sub eff}, the noninductive fraction of the current can be determined. Such a technique gives the possibility of measuring directly the bootstrap current profile and the noninductively driven current from auxiliary heating such as neutral beam injection or fast wave current drive. Furthermore, if the noninductively driven current is small or if the noninductive current profile is assumed to be known, this measurement provides a local test of the conductivity model under various conditions.
- 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:
- 10173534
- Report Number(s):
- GA-A--21742; CONF-940635--7; ON: DE94016683; BR: 35AT10020/35KC07000
- Country of Publication:
- United States
- Language:
- English
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