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Title: Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets

Abstract

We have measured the production of h{nu} {approx}> 4.5 keV x-rays from low-density Ti-doped aerogel targets at the OMEGA laser facility (University of Rochester). The targets were 2.2 mm long by 2 mm diameter beryllium cylinders filled with Ti-doped (3 atomic percent) SiO{sub 2} foam. The doped-foam density was {approx} 3 mg/cc. Forty beams of the OMEGA laser ({gamma} = 351 nm) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser interaction fully ionizes the target (n{sub e}/n{sub crit} {approx}< 0.1), and allows the laser-bleaching wave to excite, supersonically, the high-Z emitter ions in the sample. The heating of the target was imaged with a gated (200 ps time resolution) x-ray framing camera filtered to observe > 4 keV. 2-D radiative hydrodynamic calculations predict rapid and uniform heating over the whole target volume with minimal energy losses into hydrodynamic motion. An x-ray streak camera, also filtered to observe > 4 keV, was used to measure the rate of heat propagation in the target. Ti K-shell x-ray emission was spectrally resolved with a two-channel crystal spectrometer and recorded with a set of calibrated aluminum x-ray diodes. Back-scattered laser energymore » is observed to be minimal. We find between 100 - 400 J of output with 4.67 {approx}< h{nu} {approx}<{approx}< 5.0 keV, predicted target performance is a factor of 2 - 3 too low in this range.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15004418
Report Number(s):
UCRL-JC-151219
TRN: US1005161
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Laser-Generated and Other X-ray and EUV Sources, Optics and Applications, San Diego, CA, Aug 03 - Aug 08, 2003
Country of Publication:
United States
Language:
English
Subject:
70; ALUMINIUM; BERYLLIUM; CAMERAS; ENERGY LOSSES; HEATING; HYDRODYNAMICS; K SHELL; LASERS; OPTICS; PERFORMANCE; PRODUCTION; SPECTROMETERS; STREAK CAMERAS; TARGETS; TIME RESOLUTION; X-RAY SOURCES

Citation Formats

Fournier, K B, Constantin, C, Poco, J, Miller, M C, Back, C, Suter, L J, Satcher, J, Davis, J, and Grun, J. Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets. United States: N. p., 2003. Web.
Fournier, K B, Constantin, C, Poco, J, Miller, M C, Back, C, Suter, L J, Satcher, J, Davis, J, & Grun, J. Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets. United States.
Fournier, K B, Constantin, C, Poco, J, Miller, M C, Back, C, Suter, L J, Satcher, J, Davis, J, and Grun, J. 2003. "Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets". United States. https://www.osti.gov/servlets/purl/15004418.
@article{osti_15004418,
title = {Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets},
author = {Fournier, K B and Constantin, C and Poco, J and Miller, M C and Back, C and Suter, L J and Satcher, J and Davis, J and Grun, J},
abstractNote = {We have measured the production of h{nu} {approx}> 4.5 keV x-rays from low-density Ti-doped aerogel targets at the OMEGA laser facility (University of Rochester). The targets were 2.2 mm long by 2 mm diameter beryllium cylinders filled with Ti-doped (3 atomic percent) SiO{sub 2} foam. The doped-foam density was {approx} 3 mg/cc. Forty beams of the OMEGA laser ({gamma} = 351 nm) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser interaction fully ionizes the target (n{sub e}/n{sub crit} {approx}< 0.1), and allows the laser-bleaching wave to excite, supersonically, the high-Z emitter ions in the sample. The heating of the target was imaged with a gated (200 ps time resolution) x-ray framing camera filtered to observe > 4 keV. 2-D radiative hydrodynamic calculations predict rapid and uniform heating over the whole target volume with minimal energy losses into hydrodynamic motion. An x-ray streak camera, also filtered to observe > 4 keV, was used to measure the rate of heat propagation in the target. Ti K-shell x-ray emission was spectrally resolved with a two-channel crystal spectrometer and recorded with a set of calibrated aluminum x-ray diodes. Back-scattered laser energy is observed to be minimal. We find between 100 - 400 J of output with 4.67 {approx}< h{nu} {approx}<{approx}< 5.0 keV, predicted target performance is a factor of 2 - 3 too low in this range.},
doi = {},
url = {https://www.osti.gov/biblio/15004418}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jul 18 00:00:00 EDT 2003},
month = {Fri Jul 18 00:00:00 EDT 2003}
}

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