Abstract
This work presents the multiple diagnostics characterization of the plasma in an axis-symmetric simple mirror trap as a function of magnetic field profile (mirror ratios and magnetic field gradient), especially in the quasi-flat B field configuration that is typical of Microwave Discharge Ion Sources, and also of neutral gas pressure and microwave power. The simultaneous use of Optical Emission Spectroscopy, Langmuir Probe and X-ray diagnostics allows the characterization of the whole electron energy distribution function (EEDF), from a few eV to hundreds of keV . Results show non-linear behaviour under small variations of even one source parameter and strong influence on EEDF of the Bmin/BECR ratio. Benefit and next developments will be highlighted.
Highlights
JINST WStudy of the influence of magnetic field profile on plasma parameters in a simple mirror trap
Optical Emission Spectroscopy, Langmuir Probe and X-ray diagnostics allows the characterization of the whole electron energy distribution function (EEDF), from a few eV to hundreds of keV
We present data from both the magnetic configurations only from Langmuir Probe (LP) data
Summary
Study of the influence of magnetic field profile on plasma parameters in a simple mirror trap. LP diagnostics: The Langmuir Probe (LP), is an invasive diagnostic, represents the easiest way to perform the measurements of density and temperature of low energy plasma electrons (1-100 eV). The probe consists of a tungsten tip with a diameter of 125 μm and a length of 4 mm, inserted in a tungsten core coated with alumina and connected via a bellows to a handling system The latter enables to insert the LP tip within the plasma in parallel with the chamber axis (penetration range 0 ÷ 300 mm). OES diagnostics: OES provides a method to determine plasma parameters in a non-invasive way. These diagnostics have the drawback that only line-of-sight-integrated results are obtained. We used the Hβ/Hγ and Hα/Hβ ratios to determine electron density and temperature and Hγ/HFulch ratio to determine the relative abundance between atomic and molecular hydrogen nH /nH2
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