Yazar "Kacar, E." seçeneğine göre listele

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  • [ X ]
    Öğe
    Simulation of Ni-like and Co-like X-rays emitted from laser produced tin plasmas
    (Inst Physics Acad Sci Czech Republic, 2006) Atalay, B.; Aydin, R.; Demir, A.; Kenar, N.; Kacar, E.
    The Ni-like and Co-like X-rays emitted from laser produced Tin plasmas generated using the 1.06 mu m, 1.2 ns pulses from a Nd-YAG laser were modelled. The modelling includes the Ni-like and Co-like X-ray resonance line spectrum emitted from Sn plasma between 12 angstrom - 25 angstrom and also free-free and free-bound continuous spectrum emitted from the Zn-, Cu-, Ni-, Co- and Fe-like ions between 1 angstrom and 30 angstrom. Then, X-ray conversion efficiencies were calculated using these spectra. Maximum X-ray conversion efficiency was obtained 3.54 % at power density of 5 x 10(12) Wcm(-2) into 2 pi steradian. X-ray pulse durations were calculated spectrally integrated total X-ray emission of the Ni-like and Co-like from Sn plasmas.
  • [ X ]
    Öğe
    Spectroscopic investigation of a double discharge pulsed electron beam generator
    (Taylor & Francis Inc, 2008) Goktas, H.; Kacar, E.; Demir, A.
    The wide range of applications of the plasma-based electron beam generator make it necessary to diagnose the device with a noninterfering method. The results of experimental and modeling studies of neutral helium and hydrogen beta spectral lines emitted from the double discharge pulsed electron beam generator are presented in this paper. Neutral helium lines emitted from the plasma in the pressure range 0.1-0.4torr are studied and compared with results of the collisional radiative model. The duration of the electron beam is shorter than 100 ns, and the peak current intensity is of order amperes. The full width at half maximum of the H spectral line is used for the determination of the plasma electron density, found as 3.16 x 10(21) m(-3) at 0.3 torr, and good agreement is obtained by comparing with the full computer simulation method.
  • [ X ]
    Öğe
    Spectroscopic measurements of electron temperature and electron density in electron beam plasma generator based on collisional radiative model
    (Taylor & Francis Inc, 2007) Goktas, H.; Demir, A.; Kacar, E.; Hegazy, H.; Turan, R.; Oke, G.; Seyhan, A.
    The current work describes a spectroscopic method for determining the electron temperature and electron density in an electron beam generator using argon spectral lines based on a collisional radiative model. Neutral and first-ionized Ar lines emitted from the electron beam generator are studied experimentally. A collisional radiative code was developed to simulate the Ar (I) and Ar (II) spectral emission and to compare the results with the experimental data for electron density and temperature determination. At lines and excited level densities were calculated by solving rate equations using the Gauss elimination method. The argon spectrum is recorded experimentally by superposing two discharges, namely a low pressure DC glow discharge and a high current pulsed discharge. Spectral lines between 350 nm and 950 nm were recorded using an integrated signal technique on a charge-coupled device. Electron temperature is determined by the relative intensity ratio method of two spectral lines. The relative intensity ratios of each peak are compared in a specific pressure range at various values, and good correlation is reported.