Author: Meneau, F.
Paper Title Page
MOPB02 Cryogenic Systems for Optical Elements Cooling at Sirius/LNLS 21
  • M. Saveri Silva, M.P. Calcanha, G.V. Claudiano, A.F.M. Fontoura, B.A. Francisco, L.M. Kofukuda, F.R. Lena, F. Meneau, G.B.Z.L. Moreno, G.L.M.P. Rodrigues, L. Sanfelici, H.C.N. Tolentino, L.M. Volpe
    LNLS, Campinas, Brazil
  • J.H. Řežende
    CNPEM, Campinas, SP, Brazil
  Funding: Ministry of Science, Technology and Innovation (MCTI)
Sirius, the Brazilian 4th-generation light source at the Brazilian Synchrotron Light Laboratory (LNLS), presents high-performance requirements in terms of preserving photon-beam quality, particularly regarding wavefront integrity and position stability. In this context, it is imperative that many silicon optical elements* be effectively cooled, such that temperatures and their control-related parameters can be precisely handled to the point in which thermal effects are acceptable concerning figure distortions and drifts at different timescales. For this class of precision equipment, the required performance can only be achieved with robust thermal management.** For this, relevant aspects related to the implementation of liquid nitrogen cooling systems need to be emphasized. Currently, two solutions are present at the first-phase beamlines, according to the component thermal load: (1) an in-house low-cost system for components under moderate loads (< 50 W), such as the mirror systems and the four-bounce monochromators, comprising a commercial cryostat connected to an instrumented vessel, whose level and pressure are controlled by the standard beamline automation system that can automatically feed it from a secondary service unit or a dedicated transfer line; (2) a commercial cryocooler for high-heat-load applications (50 - 3000 W), such as the double-crystal monochromators. This work presents the in-house solution: requirements, design aspects, operation range, as well as several discoveries and improvements deployed during the commissioning of the CATERETÊ and the CARNAÚBA beamlines, such as the prevention of ice formation, stabilization of both thermal load and flow-rate, and auto-filling parameters, among others.
*TOLENTINO. Innovative instruments (…) for the CARNAÚBA beamline at Sirius-LNLS. SRI (2018).
**VOLPE. Performance validation of the thermal model for optical components. Submit to MEDSI (2020)
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About • paper received ※ 25 July 2021       paper accepted ※ 13 October 2021       issue date ※ 09 November 2021  
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