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Materials Studies on Z

Materials Studies on Z. T. J. Tanaka, T. J. Renk, G. A Rochau, and C. L. Olson Sandia National Laboratories* Dec. 5 and 6, 2002 Naval Research Laboratory, Washington DC. *Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

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Materials Studies on Z

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  1. Materials Studies on Z T. J. Tanaka, T. J. Renk, G. A Rochau, and C. L. Olson Sandia National Laboratories* Dec. 5 and 6, 2002 Naval Research Laboratory, Washington DC *Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94AL85000.

  2. Outline • Results from last 6 months • W, W/Re, W/La2O3 Ion Beam Secondary Electron Microscopy • Future work • Z machine, heated samples • Fast closure valve on Z • Saturn-spectrum and yield • Materials

  3. Fluence and Samples on Z 2 mm Kimfol + .1 mm Al + 2.5 mm Be No Filter 2 mm Kimfol +.1 mm Al 2 mm Kimfol + .1 mm Al + 4.0 mm Be

  4. Ion Images W Platinum coating Unexposed Exposed to 1.3 J/cm2 Columnar grains Debris Crater Bottom of melted region Pancake grains Exposed to 2.3 J/cm2 Exposed to 19 J/cm2 Ion images from Michael Rye and Joe Michael

  5. A close look at debris craterW at 19 J/cm2 The crater bottom had traces of Fe, Ni and Cr. Surface must have been somewhat crystallized before impact of debris

  6. Ion Images W75%Re25% Unexposed sample Exposed to 1.3 J/cm2 Columnargrains Pancake grains Exposed to 2.3 J/cm2 Exposed to 19 J/cm2

  7. Ion Images, W99%/La2O31% by Weight Platinum coating Exposed to 0.98 J/cm2 Unexposed sample Exposed to 2.3 J/cm2 Exposed to 1.3 J/cm2

  8. Depth of Molten Layer from FIB Using optical surface profiling, changes in the surface of the samples that melted were observed. The top surface was roughened at 19 and 2.3 J/cm2, but no obvious vaporization

  9. Conclusions • From C. Olson’s presentation, fluence levels that caused roughening in samples appear melted in ion cross-section images. • Differences between W and W/25%Re include change in melting point and original grain size. These differences may account for discrepancy in apparent melt depth. • Standard cross sectioning may be needed to view any

  10. Future Work • Sample preheat to 500 to 700 ° C • Debris mitigation with Fast closure valve • Saturn as a possibility for x-ray exposures • Material selection through Lance Snead, ORNL

  11. Line of Sight Electromagnet or coil Catcher Aluminum Tube (Shutter) Positioner Debris Mitigation with a Fast Shutter • Electromagnetic shutter developed for Backlighter experiments on Z • Shutter is in regular operation • Modification of front collimator and material holder needed to provide correct collimation and heating of samples Information from Dean Rovang

  12. Saturn Spectrum and Yield 35-30 kJ of K-shell yield 250 kJ ± 15% total yield Saturn has less energy, is not used as much as Z, and costs less. Z produces more debris. Information from Christine Coverdale

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