Parallax diagnostics of radiation source geometric dilution for iron opacity experiments
| Autor: | Gregory Rochau, R. E. Falcon, James E. Bailey, Taisuke Nagayama, Guillaume Loisel |
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| Rok vydání: | 2014 |
| Předmět: |
Electron density
Materials science Opacity FOS: Physical sciences Plasma Radiation Computational physics Astrophysics - Solar and Stellar Astrophysics Hohlraum Z-pinch Electron temperature Plasma diagnostics Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation Instrumentation and Methods for Astrophysics (astro-ph.IM) Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | The Review of scientific instruments. 85(11) |
| ISSN: | 1089-7623 |
| Popis: | Experimental tests are in progress to evaluate the accuracy of the modeled iron opacity at solar interior conditions [J.E. Bailey et al., Phys. Plasmas 16, 058101 (2009)]. The iron sample is placed on top of the Sandia National Laboratories z-pinch dynamic hohlraum (ZPDH) radiation source. The samples are heated to 150 - 200 eV electron temperatures and 7e21 - 4e22 e/cc electron densities by the ZPDH radiation and backlit at its stagnation [T. Nagayama et al., Phys. Plasmas 21, 056502 (2014)]. The backlighter attenuated by the heated sample plasma is measured by four spectrometers along +/- 9 degree with respect to the z-pinch axis to infer the sample iron opacity. Here we describe measurements of the source-to-sample distance that exploit the parallax of spectrometers that view the half-moon-shaped sample from +/-9 degree. The measured sample temperature decreases with increased source-to-sample distance. This distance must be taken into account for understanding the sample heating. Comment: Published online 17 July 2014 (http://scitation.aip.org/content/aip/journal/rsi/85/11/10.1063/1.4889776) |
| Databáze: | OpenAIRE |
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