The new He-3 cryostat of EMA beamline

Full text: The study of materials at low temperatures (T<5K) is very important for the discovery of new phenomena. Although the study of macroscopic properties of materials, such as resistivity and magnetization, in the mK range is usual in many laboratories around the world, the possibility of reach the low temperature regime (T<2K) at Synchrotron facilities remains extremely challenge, mainly due the high heat power of the x-ray beam. On top of that, here we present the design of a new adsorption cryostat to operate under unique conditions at EMA beamline of Sirius. The instrument was designed to be able to suffer the incidence of up to 1mW of x-ray power having as main objective reach temperatures down to 1K for X-ray absorption, diffraction and scattering experiments. This cryostat will use He-3 for the cooling process. The He-3 reservoir will be directly connect to an activated coconut charcoal pump in order to control the He-3 pressure. The design of the cryostat was carried out using the Inventor software, with its dimensions and the heat exchange being previously simulated using appropriated softwares. The commissioning should be carried out in the first semester of 2021 and we believe that successful of this new instrumentation might open several new opportunities for study of materials using Synchrotron techniques at low temperatures for the Brazilian community. (author)