Diagnostico de um plasma criado por RF e imerso em campo magnetico

AUTOR(ES)
DATA DE PUBLICAÇÃO

1981

RESUMO

The work presented here has two major parts. Firstly, I describe the construction of an ion energy analyzer to measure the temperature and other properties of plasmas. Secondly, I study the properties of a mirror-confined plasma created by radio frequency heating. In this study, the diagnostic of the plasma is carried out using the ion energy analyzer and Langmuir probes. The analyzer is of the electrostatic type with cylindrical and concentric metallic plates. The angle between the entrance and exit slits is 127° 17 .The detector is assembled in a "Daly" configuration and consists of a metallic target, a high-voltage negative power supply, a scintillator, and a photomultiplier. This system is appropriate to measure very small ion currents from steady-state or pulsed plasmas. The Langmuir probes are used to monitor the electron temperature parallel to the field lines, the plasma density and the potential. These measurements are particularly relevant in region of electron cyclotron resonance. A method to measure the temperature perpendicular to the field lines is also developed. The relationship between the plasma potential and magnitude of the kinetic pressure and magnetic field is studied using the energy analyzer. It is observed that the ion energy also varies with the pressure and the magnetic field. The correspondence between this variation and the ion temperature and/or the plasma potential is discussed. Some of the results of the analyzer are compared with these of a Langmuir probe

ASSUNTO(S)

diagnostico de plasma campo magnetico (fisica cosmica)

ACESSO AO ARTIGO

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