Lifetime survivability of contaminated target-chamber optics

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Target chambers used for Inertial Confinement Fusion (ICF) expose laser optics to a very hostile environment, not only from high-fluence laser irradiation but also x-ray irradiation and particulate debris from targets and chamber wall materials. Expendable debris shields provide the first line of defense to more costly optics upstream in the laser beam path to contaminants generated within the target chamber. However, the replacement of a large number of debris shields is also an expensive proposition so that extending their usable lifetime within the chamber is important. We have conducted tests to show that optics can both be cleaned and ... continued below

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14 p.

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Rainer, F.; Anderson, A.; Burnham, A.; Milam, D. & Turner, R. November 1, 1996.

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Description

Target chambers used for Inertial Confinement Fusion (ICF) expose laser optics to a very hostile environment, not only from high-fluence laser irradiation but also x-ray irradiation and particulate debris from targets and chamber wall materials. Expendable debris shields provide the first line of defense to more costly optics upstream in the laser beam path to contaminants generated within the target chamber. However, the replacement of a large number of debris shields is also an expensive proposition so that extending their usable lifetime within the chamber is important. We have conducted tests to show that optics can both be cleaned and damaged by laser irradiation at 355 nm after being contaminated with potential chamber-wall materials such as B{sub 4}C and Al{sub 2}O{sub 3}. Such optics can survive from one to hundreds of laser shots, depending on degree of contamination and laser fluence levels. Similarly, we have studied the survivability of optics that have been exposed to direct contamination from representative target materials irradiated in the target chamber. We have also studied the effects on optics that were not directly exposed to targets, yet received secondary exposure from the above directly-exposed samples.

Physical Description

14 p.

Notes

INIS; OSTI as DE97051540

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  • 28. annual symposium on optical materials for high power lasers - Boulder damage symposium, Boulder, CO (United States), 7-9 Oct 1996

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  • Other: DE97051540
  • Report No.: UCRL-JC--124943
  • Report No.: CONF-961070--13
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 469643
  • Archival Resource Key: ark:/67531/metadc685283

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 17, 2016, 1:11 p.m.

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Rainer, F.; Anderson, A.; Burnham, A.; Milam, D. & Turner, R. Lifetime survivability of contaminated target-chamber optics, article, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc685283/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.