Spectroscopic investigations of two equal colliding plasma plumes of boron nitride.
06-05-2015 07:25
ABSTRACT: The beam of a ruby laser is split into two equal parts of 1.5 J energy (20 ns FWHM) which produced two adjacent plasma plumes of boron nitride when focused onto a respective target placed in vacuum. The target consists of two slabs fixed at an angle of 90r{} to each other. The image of the expanding plasma plumes in the case of a single plume and in the case of two colliding plumes is recorded by an XUV gated pinhole camera connected with an MCP-CCD system. Also, spectroscopic measurements for both cases are performed at different distances from the common edge of the two target slabs in the wavelength range 3-16 nm by using a grazing incidence spectrograph fitted with the MCP-CCD combination. The plasma temperature of the two equal boron nitride colliding plumes is calculated at different distances from the common edge of the two target slabs. The plume temperature in the interaction region increased from 45 to 66 eV in the case of the colliding plasmas due to the conversion of directed kinetic energy into thermal energy.