Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Challenges in the manufacturing of a cryogenic cooling manifold for an X-ray monochromator at Sirius Light Source
Submission Author:
Marlon Saveri Silva , SP
Co-Authors:
Marlon Saveri Silva, Ricardo Luiz Parise, Renan Geraldes
Presenter: Marlon Saveri Silva
doi://10.26678/ABCM.COBEM2021.COB2021-0370
Abstract
The current work discloses and details the solutions for the challenges in manufacturing a liquid nitrogen distribution circuit carefully designed to minimize the flow-induced vibrations in cryocooling the High-Dynamic Double-Crystal Monochromator (HD-DCM), an optical instrument responsible for selecting specific narrow energy bands from broad-band photon beams at Sirius – the 4th-generation synchrotron light source in the Brazilian Synchrotron Light Laboratory (LNLS) at the Brazilian Center for Research in Energy and Materials (CNPEM). The design relies on modal and computational fluid dynamics (CFD) simulations and on the selection of appropriate materials and processes, contributing to the development of an innovative national piece of technology. The elaborated geometry of the main manifold was achieved by means of additive manufacturing in AISI 316L, which needed to be validated for ultra-high vacuum (UHV) compatibility. The oxygen-free copper heat sinks that make actual contact with the main optical elements, namely, diffracting silicon crystals, in turn, were manufactured via vacuum brazing processes at different temperatures. Finally, the union of the small stainless-steel distribution pipes between the manifold and the copper heat-sinks was made by laser welding. The final product shows how the association of different techniques has led to a successful result, since the circuit is currently in operation in the HD-DCM at the Extreme Condition X-Ray Method of Analysis Beamline (EMA), with validated UHV compatibility, and cooling and dynamic stability performances. Now, new distribution circuits based on the developed technology are currently in design for future DCM models. This study also compares the manufacturing process of this successful solution with previous versions.
Keywords
Additive manufacturing, Brazing Process, welding process, Cryogenic cooling, Synchrotron radiation
