POP: Radiation: Emission, Absorption, Transport http://scitation.aip.org/ POP: Radiation: Emission, Absorption, Transport Optical diagnosis and theoretical simulation of laser induced lead plasma spectrum http://link.aip.org/link/?PHP/19/013302/1&agg=rss Hong Bo Fu, Chuan Song Chen, Bao Yuan Man, Xiao Song, and Dong Liu<br/> Plasmas generated during incipient laser ablation of lead in air were studied using emission spectroscopy and fast photography by an intensified charge coupled device (ICCD) camera. An improved plasma emission model was introduced, invoking one-dimensional radiative transfer, to describe the observe ... [Phys. Plasmas 19, 013302 (2012)] published Fri Jan 20, 2012. Nonthermal effects on the electron-atom bremsstrahlung process in generalized Lorentzian plasmas http://link.aip.org/link/?PHP/19/013301/1&agg=rss Young-Dae Jung and Woo-Pyo Hong<br/> The nonthermal effects on the electron-atom bremsstrahlung process are investigated in generalized Lorentzian plasmas. The screened atomic wave function and energy for the hydrogen atom in Lorentzian plasmas are obtained by the Ritz variational method. The electron-atom bremsstrahlung radiation cros ... [Phys. Plasmas 19, 013301 (2012)] published Fri Jan 6, 2012. Opacity measurement of a gold plasma at T = 85 eV http://link.aip.org/link/?PHP/18/113301/1&agg=rss Jiyan Zhang, Yan Xu, Jiamin Yang, Guohong Yang, Hang Li et al.<br/> The opacity of a gold plasma at the temperature of 85 eV and density of 0.02 g/cm was measured over the energy range from 150 eV to 1200 eV. The gold sample was heated by thermal x-ray radiation generated with a foam-baffled gold cavity. The sample transmission was obtained from the backlight, absor ... [Phys. Plasmas 18, 113301 (2011)] published Mon Nov 28, 2011. Anomalous resistivity effect on multiple ion beam emission and hard x-ray generation in a Mather type plasma focus device http://link.aip.org/link/?PHP/18/103302/1&agg=rss R. A. Behbahani and F. M. Aghamir<br/> Multi ion beam and hard x-ray emissions were detected in a high inductance (more than 100 nH) Mather type plasma focus (PF) device at different filling gas pressures and charging voltages. The signal analysis was performed through the current trace, as it is the fundamental signal from which all of ... [Phys. Plasmas 18, 103302 (2011)] published Fri Oct 14, 2011. Charge exchange recombination spectroscopy for alpha particles colliding with hydrogen atoms http://link.aip.org/link/?PHP/18/103301/1&agg=rss X. J. Liu, L. Liu, J. G. Wang, Y. Z. Qu, and B. J. Xiao<br/> The intensities of charge exchange recombination spectroscopy (CXRS) of alpha particles colliding with the hydrogen atoms in the neutral beam injection (NBI) are calculated by solving the rate equations including electron collision processes in the quasi-static state approximation. The effects of el ... [Phys. Plasmas 18, 103301 (2011)] published Fri Oct 14, 2011. Early-stage plasma dynamics with air ionization during ultrashort laser ablation of metal http://link.aip.org/link/?PHP/18/093302/1&agg=rss Wenqian Hu, Yung C. Shin, and Galen King<br/> In this study, the early-stage plasma evolution generated by an ultrashort laser pulse is investigated through pump-probe shadowgraph measurements and simulations. The measurements are performed to show the evolution of the plasma front, while the simulation model is used to further investigate the ... [Phys. Plasmas 18, 093302 (2011)] published Fri Sep 9, 2011. Beyond Zeeman spectroscopy: Magnetic-field diagnostics with Stark-dominated line shapes http://link.aip.org/link/?PHP/18/093301/1&agg=rss S. Tessarin, D. Mikitchuk, R. Doron, E. Stambulchik, E. Kroupp et al.<br/> A recently suggested spectroscopic approach for magnetic-field determination in plasma is employed to measure magnetic fields in an expanding laser-produced plasma plume in an externally applied magnetic field. The approach enables the field determination in a diagnostically difficult regime for whi ... [Phys. Plasmas 18, 093301 (2011)] published Tue Sep 6, 2011. On the Rydberg transitions and elemental compositions in the laser produced Al (6063) plasma http://link.aip.org/link/?PHP/18/083303/1&agg=rss M. A. Baig, M. A. Fareed, B. Rashid, and R. Ali<br/> We present new studies on the optical emission spectra of the laser produced Al 6063 alloy plasma generated by the 1064 nm Nd: YAG laser. The spectrum reveals Rydberg transitions; nd D --> 3p P (n = 3 8), ns S --> 3p P (n = 46), and the dominant spectral lines of the other constituent elements. We ... [Phys. Plasmas 18, 083303 (2011)] published Mon Aug 22, 2011. Diagnosis of the ion density in two discharge modes generated in atmospheric pressure argon with pin-to-plate dielectric barrier geometry http://link.aip.org/link/?PHP/18/083302/1&agg=rss Bing Qi, Jianjun Huang, Yunming Qiu, Ying Liu, and Lijun Liu<br/> In this study, the ion densities of an ac dielectric barrier discharge (DBD) (that is, a pin-to-plate DBD) as a function of the applied frequency in argon have been studied by means of the plasma radiation. The pin-to-plate DBD shows the characteristic of radiation oscillations with a low-frequency ... [Phys. Plasmas 18, 083302 (2011)] published Thu Aug 11, 2011. Relations between light emission and electron density and temperature fluctuations in a helium plasma http://link.aip.org/link/?PHP/18/083301/1&agg=rss Shuiliang Ma, John Howard, and Nandika Thapar<br/> The relations between three atomic lines, He I 667.8 nm (3D --> 2P), 706.5 nm (3S --> 2P), and 728.1 nm (3S --> 2P), and the underlying fluctuations in a helium plasma are investigated for the quantitative interpretation of optical observations in plasma fluctuation measurements. Frequency dependent ... [Phys. Plasmas 18, 083301 (2011)] published Thu Aug 11, 2011. A comparative study of single and double pulse of laser induced breakdown spectroscopy of silver http://link.aip.org/link/?PHP/18/073301/1&agg=rss Babar Rashid, Rizwan Ahmed, Raheel Ali, and M. A. Baig<br/> We present a comparative study of the collinear and orthogonal pre-ablation dual pulse configurations of laser induced breakdown spectroscopy (LIBS) of silver using Nd:YAG lasers. The effect of the inter-pulse delay and the ratio of the laser pulse energies on the signal intensity enhancement for bo ... [Phys. Plasmas 18, 073301 (2011)] published Fri Jul 29, 2011. Oblique radiative shocks, including their interactions with nonradiative polytropic shocks http://link.aip.org/link/?PHP/18/056901/1&agg=rss F. W. Doss, R. P. Drake, and E. S. Myra<br/> A theory of shocks dominated by radiation energy flux in optically mixed thin-upstream thick-downstream systems, in which the temperature immediately ahead and some short distance behind the shock front are equilibrated by radiation transport, is presented. This theory is applied to determine proper ... [Phys. Plasmas 18, 056901 (2011)] published Wed May 4, 2011. Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material http://link.aip.org/link/?PHP/18/053301/1&agg=rss Yan Xu<!--orlang--> (&#x8BB8;&#x7430;)<!--orlang-->, Tuo Zhu<!--orlang--> (&#x6731;&#x6258;)<!--orlang-->, Shuanggui Li<!--orlang--> (&#x674E;&#x53CC;&#x8D35;)<!--orlang-->, and Jiamin Yang<!--orlang--> (&#x6768;&#x5BB6;&#x654F;)<!--orlang--><br/> Laser-irradiated Au layer with CH foam coating is investigated numerically. It is found that when coated with under-critical density CH foam more thermal radiation is produced, while less radiation is produced when coated with over-critical density CH foam. The under-critical density CH foam coating ... [Phys. Plasmas 18, 053301 (2011)] published Mon May 2, 2011. Optical properties of water at high temperature http://link.aip.org/link/?PHP/18/043301/1&agg=rss Martin French and Ronald Redmer<br/> We calculate optical properties of water along the principal Hugoniot curve from ambient conditions up to temperatures of 130 000 K with density functional theory (DFT) and the Kubo-Greenwood formula. The effect of the exchange correlation functional is examined by comparing the generalized gradient ... [Phys. Plasmas 18, 043301 (2011)] published Wed Apr 20, 2011. Study on optimal inertial-confinement-fusion hohlraum wall radial density and wall loss http://link.aip.org/link/?PHP/18/033301/1&agg=rss Lu Zhang, Yongkun Ding, Jiamin Yang, Shunchao Wu, and Shaoen Jiang<br/> Reducing hohlraum wall loss is one of the most important ways to improve hohlraum coupling efficiency in laser indirect drive inertial-confinement fusion. It is appeared that a high Z metallic foam as hohlraum wall material will reduce wall loss. By adjusting initial hohlraum wall density distributi ... [Phys. Plasmas 18, 033301 (2011)] published Wed Mar 9, 2011. Simulations of the spectrum from a photoionized Si plasma http://link.aip.org/link/?PHP/18/023301/1&agg=rss Bao Lihua<!--orlang--> (&#x9C8D;&#x5229;&#x534E;)<!--orlang-->, Wu Zeqing<!--orlang--> (&#x5434;&#x6CFD;&#x6E05;)<!--orlang-->, Duan Bin<!--orlang--> (&#x6BB5;&#x658C;)<!--orlang-->, Ding Yongkun, and Yan Jun<!--orlang--> (&#x989C;&#x541B;)<!--orlang--><br/> In order to interpret the spectrum of a photoionized Si plasma, we calculate the level populations and emissions using a collisional-radiative equilibrium model with detailed atomic data. In our calculations, levels with principal quantum number up to 9 are included and the electron impact processes ... [Phys. Plasmas 18, 023301 (2011)] published Mon Feb 14, 2011. Principles of the radiative ablation modeling http://link.aip.org/link/?PHP/17/123302/1&agg=rss Yves Saillard, Philippe Arnault, and Virginie Silvert<br/> Indirectly driven inertial confinement fusion (ICF) rests on the setting up of a radiation temperature within a laser cavity and on the optimization of the capsule implosion ablated by this radiation. In both circumstances, the ablation of an optically thick medium is at work. The nonlinear radiatio ... [Phys. Plasmas 17, 123302 (2010)] published Thu Dec 30, 2010. Calculation of spatial distribution of optical escape factor and its application to He I collisional-radiative model http://link.aip.org/link/?PHP/17/123301/1&agg=rss Yohei Iida<!--orlang--> (&#x98EF;&#x7530;&#x6D0B;&#x5E73;)<!--orlang-->, Shinichiro Kado<!--orlang--> (&#x9580;&#x4FE1;&#x4E00;&#x90CE;)<!--orlang-->, and Satoru Tanaka<!--orlang--> (&#x7530;&#x4E2D;&#x77E5;)<!--orlang--><br/> An integral analytical formula for a spatial distribution of the optical escape factor (OEF) in an infinite cylindrical plasma is derived as a function of an arbitrary upper state spatial density profile, the temperature ratio of the upper state to the lower state, and the optical depth of the corre ... [Phys. Plasmas 17, 123301 (2010)] published Mon Dec 20, 2010. Linear analysis of a W band groove-loaded folded waveguide traveling wave tube http://link.aip.org/link/?PHP/17/113305/1&agg=rss Jun He, Yanyu Wei, Yubin Gong, and Wenxiang Wang<br/> A linearized field theory of a groove-loaded folded waveguide traveling wave tube (FWTWT) is developed. The influence of groove dimensions and beam parameters on the linear gain and bandwidth of the device is investigated by numerical calculation. In addition, a comparison of the linear gain propert ... [Phys. Plasmas 17, 113305 (2010)] published Tue Nov 16, 2010. Propagation of broadband terahertz pulses through a dense-magnetized-collisional-bounded plasma layer http://link.aip.org/link/?PHP/17/113304/1&agg=rss Chengxun Yuan<!--orlang--> (&#x8881;&#x627F;&#x52CB;)<!--orlang-->, Zhongxiang Zhou<!--orlang--> (&#x5468;&#x5FE0;&#x7965;)<!--orlang-->, Xiaoli Xiang<!--orlang--> (&#x5411;&#x5C0F;&#x4E3D;)<!--orlang-->, Hongguo Sun<!--orlang--> (&#x5B59;&#x6D2A;&#x56FD;)<!--orlang-->, and Shaozhi Pu<!--orlang--> (&#x6D66;&#x7ECD;&#x8D28;)<!--orlang--><br/> The terahertz characteristics of a dense-magnetized-collisional-bounded plasma under normal incident are analyzed in this study, which is of practical significance in plasma diagnostics with electromagnetic waves. We theoretically calculate the reflection, absorption, and transmission coefficients f ... [Phys. Plasmas 17, 113304 (2010)] published Mon Nov 15, 2010. Creation of persistent, straight, 2 mm long laser driven channels in underdense plasmas http://link.aip.org/link/?PHP/17/113303/1&agg=rss G. Sarri, K. L. Lancaster, R. Trines, E. L. Clark, S. Hassan et al.<br/> The experimental study of the behavior of deuterium plasma with densities between 2 x 10 and 2 x 10 cm, subjected to a 6 TW, 30 ps, 3 x 10 W cm laser pulse, is presented. Conclusive experimental proof that a single straight channel is generated when the laser pulse interacts with the lowest densit ... [Phys. Plasmas 17, 113303 (2010)] published Fri Nov 12, 2010.