The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
J Krzywinski - One of the best experts on this subject based on the ideXlab platform.
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Damage Threshold of platinum coating used for optics for self seeding of soft x ray free electron laser
Optics Express, 2015Co-Authors: J Krzywinski, Daniele Cocco, S Moeller, Daniel RatnerAbstract:We investigated the experimental Damage Threshold of platinum coating on a silicon substrate illuminated by soft x-ray radiation at grazing incidence angle of 2 degrees. The coating was the same as the blazed grating used for the soft X-ray self-seeding optics of the Linac Coherent Light Source free electron laser. The irradiation condition was chosen such that the absorbed dose was similar to the maximum dose expected for the grating. The expected dose was simulated by solving the Helmholtz equation in non-homogenous media. The experiment was performed at 900 eV photon energy for both single pulse and multi-shot conditions. We have not observed single shot Damage. This corresponds to a single shot Damage Threshold being higher than 3 J/cm(2). The multiple shot Damage Threshold measured for 10 shots and about 600 shots was determined to be 0.95 J/cm(2) and 0.75 J/cm(2) respectively. The Damage Threshold occurred at an instantaneous dose which is higher that the melt dose of platinum.
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wavelength dependence of the Damage Threshold of inorganic materials under extreme ultraviolet free electron laser irradiation
Applied Physics Letters, 2009Co-Authors: Stefan P Hauriege, R A London, Richard M Bionta, D D Ryutov, Regina Soufli, Sasa Bajt, Mark A Mckernan, Sherry L Baker, J Krzywinski, R SobierajskiAbstract:We exposed bulk SiC and films of SiC and B4C to single 25 fs long free-electron-laser pulses with wavelengths between 13.5 and 32 nm. The materials are candidates for x-ray free-electron laser optics. We found that the Threshold for surface-Damage of the bulk SiC samples exceeds the fluence required for thermal melting at all wavelengths. The Damage Threshold of the film sample shows a strong wavelength dependence. For wavelengths of 13.5 and 21.7 nm, the Damage Threshold is equal to or exceeds the melting Threshold, whereas at 32 nm the Damage Threshold falls below the melting Threshold.
Kazuto Yamauchi - One of the best experts on this subject based on the ideXlab platform.
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Damage Threshold of platinum carbon multilayers under hard x ray free electron laser irradiation
Optics Express, 2015Co-Authors: Ayaka Nagahira, Takahisa Koyama, Satoshi Matsuyama, Yasuhisa Sano, Makina Yabashi, Haruhiko Ohashi, Tetsuya Ishikawa, Kazuto YamauchiAbstract:We evaluated the irradiation Damage induced by hard X-ray free-electron lasers to platinum/carbon multilayers intended for use in a focusing reflective mirror. In order to determine the Damage Threshold, we compared X-ray reflectivities before and after irradiation at the first-order Bragg angle using a focused X-ray free-electron laser with a beam size of approximately 1 μm and a pulse energy ranging from 0.01 to 10 μJ at a photon energy of 10 keV. We confirmed that the Damage Threshold of the platinum/carbon multilayer with a bilayer period of 3 nm was 0.051 μJ/μm2, which is sufficiently higher than that in practical applications.
R Sobierajski - One of the best experts on this subject based on the ideXlab platform.
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wavelength dependence of the Damage Threshold of inorganic materials under extreme ultraviolet free electron laser irradiation
Applied Physics Letters, 2009Co-Authors: Stefan P Hauriege, R A London, Richard M Bionta, D D Ryutov, Regina Soufli, Sasa Bajt, Mark A Mckernan, Sherry L Baker, J Krzywinski, R SobierajskiAbstract:We exposed bulk SiC and films of SiC and B4C to single 25 fs long free-electron-laser pulses with wavelengths between 13.5 and 32 nm. The materials are candidates for x-ray free-electron laser optics. We found that the Threshold for surface-Damage of the bulk SiC samples exceeds the fluence required for thermal melting at all wavelengths. The Damage Threshold of the film sample shows a strong wavelength dependence. For wavelengths of 13.5 and 21.7 nm, the Damage Threshold is equal to or exceeds the melting Threshold, whereas at 32 nm the Damage Threshold falls below the melting Threshold.
Daniel Ratner - One of the best experts on this subject based on the ideXlab platform.
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Damage Threshold of platinum coating used for optics for self seeding of soft x ray free electron laser
Optics Express, 2015Co-Authors: J Krzywinski, Daniele Cocco, S Moeller, Daniel RatnerAbstract:We investigated the experimental Damage Threshold of platinum coating on a silicon substrate illuminated by soft x-ray radiation at grazing incidence angle of 2 degrees. The coating was the same as the blazed grating used for the soft X-ray self-seeding optics of the Linac Coherent Light Source free electron laser. The irradiation condition was chosen such that the absorbed dose was similar to the maximum dose expected for the grating. The expected dose was simulated by solving the Helmholtz equation in non-homogenous media. The experiment was performed at 900 eV photon energy for both single pulse and multi-shot conditions. We have not observed single shot Damage. This corresponds to a single shot Damage Threshold being higher than 3 J/cm(2). The multiple shot Damage Threshold measured for 10 shots and about 600 shots was determined to be 0.95 J/cm(2) and 0.75 J/cm(2) respectively. The Damage Threshold occurred at an instantaneous dose which is higher that the melt dose of platinum.
Ayaka Nagahira - One of the best experts on this subject based on the ideXlab platform.
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Damage Threshold of platinum carbon multilayers under hard x ray free electron laser irradiation
Optics Express, 2015Co-Authors: Ayaka Nagahira, Takahisa Koyama, Satoshi Matsuyama, Yasuhisa Sano, Makina Yabashi, Haruhiko Ohashi, Tetsuya Ishikawa, Kazuto YamauchiAbstract:We evaluated the irradiation Damage induced by hard X-ray free-electron lasers to platinum/carbon multilayers intended for use in a focusing reflective mirror. In order to determine the Damage Threshold, we compared X-ray reflectivities before and after irradiation at the first-order Bragg angle using a focused X-ray free-electron laser with a beam size of approximately 1 μm and a pulse energy ranging from 0.01 to 10 μJ at a photon energy of 10 keV. We confirmed that the Damage Threshold of the platinum/carbon multilayer with a bilayer period of 3 nm was 0.051 μJ/μm2, which is sufficiently higher than that in practical applications.
