Engineering topics

Navrotski, Gary

Publications and source records attributed to Navrotski, Gary.

3 records

DOE OSTI2019

Lead Shielded Enclosures for CHESS-U

Shielded enclosures are critical components of radiation safety at scientific, medical, and industrial facilities around the world. As part of the Cornell High Energy Synchrotron Source Upgrade (CHESS-U), ADC has designed, fabricated, and installed highly modular shielded enclosures ("hutches" at synchrotron facilities). ADC utilized expert consultation offered by several facilities including engineers from Advanced Photon Source (APS)(1-3) and Cornell High Energy Synchrotron Source (CHESS); with each facility providing guidance to assure that the design satisfies the rigorous radiation safety requirements. In this paper, ADC will discuss the design of these hutches, particularly the modular design elements which facilitate rapid installation to minimize downtime at the synchrotron.

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DOE OSTI2017

Establishment of new design criteria for GlidCop ® X-ray absorbers

Here, an engineering research program has been conducted at the Advanced Photon Source (APS) in order to determine the thermomechanical conditions that lead to crack formation in GlidCop ® , a material commonly used to fabricate X-ray absorbers at X-ray synchrotron facilities. This dispersion-strengthened copper alloy is a proprietary material and detailed technical data of interest to the synchrotron community is limited. The results from the research program have allowed new design criteria to be established for GlidCop ® X-ray absorbers based upon the thermomechanically induced fatigue behavior of the material. X-ray power from APS insertion devices was used to expose 30 GlidCop ® samples to 10000 thermal loading cycles each under various beam power conditions, and all of the samples were metallurgically examined for crack presence/geometry. In addition, an independent testing facility was hired to measure temperature-dependent mechanical data and uniaxial mechanical fatigue data for numerous GlidCop ® samples. Data from these studies support finite element analysis (FEA) simulation and parametric models, allowing the development of a thermal fatigue model and the establishment of new design criteria so that the thermomechanically induced fatigue life of X-ray absorbers may be predicted. It is also demonstrated how the thermal fatigue model can be used as a tool to geometrically optimize X-ray absorber designs.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

DOE OSTI2016

High-heat-load monochromator options for the RIXS beamline at the APS with the MBA lattice

With the MBA lattice for APS-Upgrade, tuning curves of 2.6 cm period undulators meet the source requirements for the RIXS beamline. The high-heat-load monochromator (HHLM) is the first optical white beam component. There are four options for the HHLM such as diamond monochromators with refrigerant of either water or liquid nitrogen (LN{sub 2}), and silicon monochromators of either direct or indirect cooling system. Their performances are evaluated at energy 11.215 keV (Ir L-III edge). The cryo-cooled diamond monochromator has similar performance as the water-cooled diamond monochromator because GaIn of the Cu-GaIn-diamond interface becomes solid. The cryo-cooled silicon monochromators perform better, not only in terms of surface slope error due to thermal deformation, but also in terms of thermal capacity.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗