JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{francisco:medsi2023-tupyp005,
author = {B.A. Francisco and M.P. Calcanha and R.R. Geraldes and L.M. Kofukuda and G.P. Lima and M. Saveri Silva and L.M. Volpe},
% author = {B.A. Francisco and M.P. Calcanha and R.R. Geraldes and L.M. Kofukuda and G.P. Lima and M. Saveri Silva and others},
% author = {B.A. Francisco and others},
title = {{On the Performance of Cryogenic Cooling Systems for Optical Elements at Sirius/LNLS}},
% booktitle = {Proc. MEDSI'23},
booktitle = {Proc. 12th Int. Conf. Mech. Eng. Design Synchrotron Radiat. Equip. Instrum. (MEDSI'23)},
eventdate = {2023-11-06/2023-11-10},
pages = {40--43},
paper = {TUPYP005},
language = {english},
keywords = {controls, cryogenics, operation, optics, ECR},
venue = {Beijing, China},
series = {International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {07},
year = {2024},
issn = {2673-5520},
isbn = {978-3-95450-250-9},
doi = {10.18429/JACoW-MEDSI2023-TUPYP005},
url = {https://jacow.org/medsi2023/papers/tupyp005.pdf},
abstract = {{Sirius’ long beamlines are equipped with cryogenic cooled optics to take advantage of the Silicon thermal diffusivity and expansion at those temperatures, contributing to the preservation of the beam profile. A series of improvements was evaluated from the experience in the employment of such cooling systems during the early years of operation. The main topic refers to the prevention of instabilities in the temperature of the optics due to variations in the liquid nitrogen cylinder pressure, refill automation or progressive variations of the convective coefficient into the cryostat. This work discusses the performance of these systems after optimizing the pressure of the vessels and their control logics, the effectiveness of occasional purges, cool down techniques, and presents the monitoring interface and interlock architecture. Moreover, we present the reached solution for achieving higher beam stability, considering liquid nitrogen flow active control (commercial and in-house). Also propose the approach for the future 350 mA operation, including different cooling mechanisms.}},
}