Effects of temperature gradients and sheath power transmission on Langmuir probes
Atomic physics effects, which can be critical for understanding and controlling plasmas near the material surfaces in magnetic fusion devices and technical plasmas, are often sensitive functions of the electron temperature, making accurate temperature measurements important. Questions have been raised whether the temperatre extracted from Langmuir probes properly accounts for temperature profile and ohmic heating effects. Careful attention must be given to the definition of the effective temperature of a non-Maxwellian distribution, and an effort made to discuss self-consistent profiles. Also, depending on the upstream boundary conditions imposed, the instantaneous plasma parameters can depend on the bias voltage applied. While significant errors seem possible, quantitative understanding will require more detailed and realistic models.
Bibliographic Reference: Article: Journal of Nuclear Materials, 266-269, (1999), 1020-1022
Record Number: 199910716 / Last updated on: 1999-05-14
Original language: en
Available languages: en