SPECTROSCOPIC STUJDIES FOR HIGH DENSE PLSMA .

Abstract

The main interest of the study is to diagnose densplasma by developed a spectroscopic method where other dfagnostic techniques fail. Laser scattering is used with the spectroscopic study simultaneously.

The dense plasma is produced by liner z-pinch, where 11.1 11F, 25-40 kV, capacitor bank is discharged betv!reen two electrodes. The driver gas between the two eledrodes is preionized by another discharge system. The test gas iinjected at the center of the upper electrode along the axis by fa!valve. I Laser scattering arrangement has been used to measure the plasma density and temperature of the plasma.

FWHM of Pa Hell is used to determine the electron density in helium plasma. Simplified approach is used to overc' ome the optical thickness of this line. Good agreement with density determined from laser scattering is obtained.

Wings of La line of hydrogen is used for the first titne to get the electron density in hydrogen plasma. Both wings reveal an electron density in good agreement with the electron density determined from collective Thomson scattering. I ·

. I Transitions between adjacent levels of high quantum numbers of ArVIII 5f-6g and 5g-6h with A. = I 15.47 !nm and A. = 116.39 nm, respectively have been develop d. The measured width of both lines is 0.4 nm at electron density 3xl01B cm·3• It has been found that the line width vahes with

( ii )

density for both lines linearly as:

110 = 7.0 x 1018 cm-3 ..

FWI-IM

nm

The lower transitions of ArVIII 3p-3d with wavelength 51.943 nm and 52.645 nm showed a linear relation between density and the Stark width in density range lxlOIS - 5xlOIS cm·3 •