Physics

  2010 AUG 24 - (VerticalNews.com) -- According to a study from Mons, Belgium, "Transition probabilities for allowed and forbidden lines in neutral, singly ionized and doubly ionized tungsten are discussed in the present paper."

  "For the electric dipole transitions, recommended values are proposed from a critical evaluation of the data available in the literature. For the magnetic dipole and electric quadrupole transitions, for which no data have been published so far, a new set of radiative rates has been obtained using a relativistic Hartree-Fock approach including core-polarization effects," wrote P. Quinet and colleagues ...read more

  2010 AUG 24 - (VerticalNews.com) -- According to a study from the United States, "The core imaging x-ray spectrometer (CIXS) is one of several ITER diagnostic systems planned for measurements of the central ion and electron temperature profiles and of the toroidal and poloidal rotation velocity profiles, T-i, T-e, upsilon(phi), and upsilon(theta). respectively. The diagnostic is based on precision determinations of the Doppler broadening and centroid shift of the lines of highly ionized heavy impurities using a curved Bragg crystal spectral disperser and imager. ...read more

  2010 AUG 24 - (VerticalNews.com) -- "From the intensity ratios of the three He I lines measured at 20 kHz, the temporal evolutions of the electron temperature and density during and after the power and the particle flow into the divertor plasma caused by edge localized modes are determined. The electron temperature increases from 70 eV to 80 eV with increasing D a intensity," investigators in Naka, Japan report.

  "Then, at the peak of D a intensity, the electron temperature starts decreasing down to 60 eV. The electron density increases from 0.1 x 10(19) m(-3) to 0.3 x 10(19) m(-3) with increasing D a intensity, and then starts to decrease more gradually compared with the electron temperature after the peak of D a intensity," wrote T. Nakano and colleagues ...read more