19 research outputs found
Parameters of broadening of water molecule absorption lines by argon derived using different line profile models
The water vapor absorption spectrum was measured in the spectral region 6700–7650 cm–1 with argon as a buffer gas. The room-temperature spectrum was measured using a Bruker IFS 125-HR Fourier Transform Spectrometer with high signal-to-noise ratio, with a spectral resolution of 0.01 cm–1, at argon pressures from 0 to 0.9 atm. The H2O absorption spectral line parameters are derived by fitting two line shape profiles (Voigt and speed-dependent Voigt) to the experimental spectrum. It is shown that the use of speed-dependent Voigt profile provides the best agreement with experimental data
Recommended from our members
Final report on the Purchase Order B-192560
This is final report on the Purchase Order B-192560. It consists of 3 chapters. Chapter 1 contains stability analysis of axisymmetric plasma configurations in which there exists a population of ``hot`` particles whose drift frequency around the magnetic axis greatly exceeds the frequency of the flute perturbation. It is shown that fast drifting particles affect not potential energy of MHD perturbations but their kinetic energy. The possibility of the stabilization of the flute instability due to the ``negative inertia`` effect is discussed. Chapter 2 is devoted to the theory of non-paraxial MHD stabilizers for axisymetric mirror devices for plasma confinement. In this chapter, a method of search of axisymmetric configurations which provide stability of rigid flute mode is given and several theorems, elucidating the effects of non-paraxiality on flute modes stabilization by sloshing ions are proved. Chapter 3 presents experimental part of the work. Two interrelated sets of experiments were planned for the GDT facility in order to study the problems included into an experimental part of the work. The first was intended for measurements of a pressure-weighted curvature observing a plasma equilibrium response to applying a small test perturbation of magnetic field in the MHD-anchor region. A simple magneto-hydrodynamic model is used to deduce from experimental data the pressure-weighted curvature of the field lines that determines a plasma stability against flute modes. Another set of experiments was devoted to studying the stabilization of the flutes by a cusp end cell. The cusp cell was attached to the GDT device at early 1992. The cusp coils was electrically tested and desired parameters were achieved. Within, the frame of this Purchase Order we accurately measured plasma parameters in the cusp, studied stability limits and measured some spatial characteristics of the unstable MHD-modes above the instability threshold
Characterization of ion species mix of the TEXTOR diagnostic hydrogen beam injector with a rf and arc-discharge plasma box
The ion specie fractions of the diagnostic hydrogen beam of TEXTOR tokamak have been determined by making use of a H-alpha-light Doppler shift spectroscopy and alternatively by a magnetic mass spectrometer. The measurements were done for the fixed beam energy of 50 keV and beam current variable up to 2.5 A. According to the measurements, the full energy beam component is for a radio frequency plasma box similar to50% by the particle density and more than 75% for an arc-discharge plasma box. (C) 2004 American Institute of Physics