Particle and heat flux measurements in PDX edge plasmas

Technical Report · Thu Dec 01 00:00:00 EST 1983

DOI:https://doi.org/10.2172/5471599· OSTI ID:5471599

Budny, R; Manos, D

This paper describes the use of novel combined Langmuir-calorimeter probes to measure edge plasma conditions near the midplane in PDX. The probes consisted of up to five Langmuir probes and up to two calorimeters. Single and double probe characteristics yield n/sub e/ and T/sub e/ which are compared with that derived from a triple probe analysis. The calorimeters measure heat flux in the electron and ion drift directions. This paper presents time-resolved radial profiles of n/sub e/, T/sub e/, V/sub F/ (floating potential), and P (heat flux) during high power neutral beam-heated, single-null discharges and circular scoop limiter discharges. The temporal dependence of these quantities displays the previous observed behavior with respect to gross discharge characteristics; however, an additional dependence on confinement mode has been observed. During the H-mode of energy confinement, a transient depression of n/sub e/, T/sub e/, and P occurs in the scrape-off plasma.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5471599
• Report Number(s): PPPL-2065; ON: DE84004305
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PDX DEVICES
PLASMA DIAGNOSTICS
PLASMA SHEATH
CALORIMETERS
LANGMUIR PROBE
ELECTRON DENSITY
ELECTRON TEMPERATURE
HEAT TRANSFER
CLOSED PLASMA DEVICES
ELECTRIC PROBES
ENERGY TRANSFER
MEASURING INSTRUMENTS
PROBES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics