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Interface reaction characterization and interfacial effects in multilayers

Description: The performance of multilayer structures as x-ray, soft x-ray and extreme ultraviolet optics is dependent on the nature of the interfaces between constituent layers. Interfacial structure and the interaction between atoms at interfaces have also been demonstrated to have significant impact on the physical properties of multilayer materials in general and thus on their performance in other applied areas. As short summary of the approaches to characterization of interfaces in multilayer structures is presented as background. Two new techniques for the experimental evaluation of interfacial structure and interfacial structure effects are then considered and examples presented. Model calculations for one of these techniques which support the experimental results are also presented. In conclusion these results are reviewed of and an assessment of their implications relative to multilayer development given.
Date: April 1, 1998
Creator: Barbee, T.W., Jr. LLNL
Partner: UNT Libraries Government Documents Department


Description: Eleven papers are included of which nine were separately abstracted. The remaining two papers appear in NSA; one, on dimensional changes in U during irradiation, appears in Voh. 15, abstract no. 4341, and the other, on x ray preferred orientation, appears in Vol. 14, abstract no. 19415. (J.R.D.)
Date: May 1, 1961
Creator: Mueller, M.H. ed.
Partner: UNT Libraries Government Documents Department

Optical diagnostics on ETA-II for x-ray spot size

Description: Improvements have been made in the performance of the ETA-II accelerator that allow a nominal 2 kA, 6 MeV beam to be focused to a spot size less that 1 mm in diameter. The improvements include reducing the energy sweep to less than +/- 0.5 & over 40 ns of the pulse using a real time energy diagnostic and improving the magnetic tune of the accelerator to reduce the emittance to 8 cm-mrad. Finally, an automated tuning system (MAESTRO) was run to minimize the time dependent centroid motion (corkscrew) by adjusting the steering dipoles over the focusing solenoids. The corkscrew motion was reduced to less than +/- 0.5 mm at the output of the accelerator.
Date: March 22, 1999
Creator: Richardson, R A
Partner: UNT Libraries Government Documents Department

Current and ultimate limitations of scanning x-ray nanotomography.

Description: X-ray nanotomography has developed into a powerful new tool for three-dimensional structural analysis. The scanning approach offers capabilities that are competitive with full-field imaging. Current and ultimate limitations of nanotomography are examined in light of recent work.
Date: February 6, 2002
Creator: McNulty, I.
Partner: UNT Libraries Government Documents Department

High-resolution imaging of early-time imprinting using normal-incidence multilayer mirrors. Final report

Description: A normal-incidence multilayer mirror telescope was designed, fabricated, and tested. The telescope consisted of a primary mirror and a secondary mirror in a Cassegrain optical configuration. The mirrors had multilayer coatings that efficiently reflected the soft x-ray radiation in a narrow bandpass centered at a wavelength of 48 {angstrom}. The telescope was taken to the Laboratory for Laser Energetics (LLE) on October 28, 1996. The telescope was mounted in a TIM instrument module on the OMEGA target chamber. The focusing and alignment of the mirrors were checked and optimized. Images were recorded on x-ray film on October 30. Images were recorded on a gated framing camera on October 31 and November 1. On each laser shot, hard x-ray images were recorded by a pinhole camera and a gated framing camera. The soft and hard x-ray images were returned to NRL for analysis. The images were digitized and compared. The major result of the study was that the soft x-ray emission from plasmas generated by 6 to 8 overlapping OMEGA beams is quite uniform, even for the case when beam smoothing techniques were not implemented. This implies that the soft x-ray emission can be used for backlighter applications and for the study of absorption by CH foils in the 48 {angstrom} wavelength region, at slightly longer wavelengths than the carbon K absorption edge where carbon is relatively transmissive. These backlighter techniques are now being implemented at LLE.
Date: May 1, 1998
Creator: Seely, J.F.
Partner: UNT Libraries Government Documents Department

CDF results on diffraction from Run I and plans for Run II

Description: Results on soft and hard diffraction obtained by the CDF Collaboration in Run I of the Fermilab Tevatron {bar p}p collider are reviewed and compared with results from the DESY ep collider HERA and with theoretical expectations. In addition, the CDF program for diffractive studies in Run II is briefly reviewed with emphasis on the relevant detector upgrades and physics goals.
Date: October 16, 2001
Creator: Goulianos, K.
Partner: UNT Libraries Government Documents Department

Specular and diffuse reflection of soft x-rays from mirrors

Description: Measurements of surface scattering from plane mirrors with different degrees of roughness using soft x-rays are reported. Angle resolved distributions of s-polarized light, scattered in the plane of incidence, were obtained with a precise reflectometer for various angles of incidence and different wavelengths. The influence of the sample preparation and the optical constants on the scattering properties is shown.
Date: August 1, 1985
Creator: Hogrefe, H.; Haelbich, R.P. & Kunz, C.
Partner: UNT Libraries Government Documents Department

Overtone production of soft x-rays with free-electron lasers

Description: Two one-dimensional free-electron laser codes have recently been written that include harmonic generation. A comparison of the results of these codes show that a self-consistent treatment of the harmonic interaction is not required in the presence of a strong fundamental field. Use of these codes to predict the effects of emittance on harmonic production have been conducted. The effects of wiggler-field amplitude fluctuations and odd-harmonic wiggler-field components on the harmonic-radiation production are also discussed.
Date: January 1, 1986
Creator: Schmitt, M.J.; Elliott, C.J.; Lee, K. & McVey, B.D.
Partner: UNT Libraries Government Documents Department