Radially localized measurements of superthermal electrons using oblique electron cyclotron emission

Technical Report · Wed May 01 04:00:00 EDT 1996

DOI:https://doi.org/10.2172/248329· OSTI ID:248329

Preische, S; Efthimion, P C; Kaye, S M

It is shown that radial localization of optically tin Electron Cyclotron Emission from superthermal electrons can be imposed by observation of emission upshifted from the thermal cyclotron resonance in the horizontal midplane of a tokamak. A new and unique diagnostic has been proposed and operated to make radially localized measurements of superthermal electrons during Lower Hybrid Current Drive on the PBX-M tokamak. The superthermal electron density profile as well as moments of the electron energy distribution as a function of radius are measured during Lower Hybrid Current Drive. The time evolution of these measurements after the Lower Hybrid power is turned off are given and the observed behavior reflects the collisional isotropization of the energy distribution and radial diffusion of the spatial profile.

• Research Organization: Princeton Univ., NJ (United States). Plasma Physics Lab.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 248329
• Report Number(s): PPPL--3185; ON: DE96010482
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON CYCLOTRON-RESONANCE
ELECTRON DENSITY
LOWER HYBRID CURRENT DRIVE
PBX DEVICES
PLASMA
PLASMA DIAGNOSTICS