نتایج جستجو برای: doppler broadening
تعداد نتایج: 56936 فیلتر نتایج به سال:
The Compton camera is a gamma ray imaging device expected to provide clinically relevant images in the SPECT applications where collimated cameras are sub-optimal. Its performances depend not only on design of detection system but also choices related tomographic reconstruction. aim this work show that accuracy modelling acquisition largely influences quality images. For purpose, we restrict he...
The spectral width observed by Doppler radars can be due to several eects including the atmospheric turbulence within the radar sample volume plus eects associated with the background ̄ow and the radar geometry and con®guration. This study re-examines simple models for the eects due to ®nite beamwidth and vertical shear of the horizontal wind. Analytic solutions of 1and 2-dimensional models ...
We present a preliminary analysis of XMM-Newton observations of the oxygen-rich supernova remnant G292.0+1.8 (MSH11-54). Although the spatial extent of the remnant is 8′ the bright central bar is narrow (1-2′) resulting in RGS spectra of a high spectral quality. This allows us to spectroscopically identify a cool, kTe= 0.3 keV, and underionized component, resolve details of the Fe-L complex, an...
This research describes advancements in the spectral analysis and error propagation techniques associated with x-ray imaging crystal spectroscopy (XICS) that have enabled this diagnostic to be used to accurately constrain particle, momentum, and heat transport studies in a tokamak for the first time. Doppler tomography techniques have been extended to include propagation of statistical uncertai...
Magnetically-broadened hydrogenic line profiles are used, in conjunction with a non-local thermodynamic equilibrium (NLTE) code, to model an optically thick phenomenon in the Alcator C-Mod tokamak fusion experiment. The line profiles, including magnetic field effects as well as Doppler and Stark broadening, have been calculated using Beline and are used in Cretin, a multi-dimensional NLTE radia...
High-temperature laser target implosions can be achieved by using relatively thin-shell targets, and they can be diagnosed by doping the fuel with krypton and measuring K-shell and L-shell lines. Electron temperatures of up to 5 keV at modest compressed densities (~ 1-5 g/cm3) are predicted for such experiments, with ion temperatures peaking above 10 keV at the center. It is found that the prof...
The frequency shift of spectral lines is most often explained by the Doppler Effect in terms of relative motion, whereas theDoppler broadening of a particular line mainly depends on the absolute temperature. The Wolf effect on the other hand deals with the correlation induced spectral change and explains both the broadening and shift of the spectral lines. In this framework a relation between t...
We report on the observation of O VII Doppler line broadening in a compact knot at the edge of SN 1006 detected with the Reflective Grating Spectrometer on board XMM-Newton. The observed line width of σ = 3.4± 0.5 eV at a line energy of 574 eV indicates an oxygen temperature of kT = 528± 150 keV. Combined with the observed electron temperature of ∼ 1.5 keV the observed broadening is direct evid...
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