MEDSI2023 - List of Authors (Francisco, B.A.)

Paper	Title	Page
TUPYP004	A Setup for the Evaluation of Thermal Contact Resistance at Cryogenic Temperatures Under Controlled Pressure Rates	37
	B.A. Francisco, D.Y. Kakizaki, M. Saveri Silva, W.H. Wilendorf, V.B. Zilli, G.S. de Albuquerque LNLS, Campinas, Brazil V.C. Kuriyama CNPEM, Campinas, SP, Brazil A. Lopes Ribeiro Federal University of Uberlandia, Uberlândia, M.G., Brazil J.H. dos Santos IF-UFRGS, Porto Alegre, Brazil
	The design of optical elements compass different development areas, such as optics, structures and dynamics, thermal, and control. In particular, the thermal designs of mirrors aim to minimize deformations, whose usual requirements are around 5 nm RMS and slope errors in the order of 150 nrad RMS. One of the main sources of uncertainties in thermal designs is the inconsistency in values of thermal contact resistances (TCR) found in the literature. A device based on the ASTM D5470 standard was proposed and designed to measure the TCR among materials commonly used in mirror systems. Precision engineering design tools were used to deal with the challenges related to the operation at cryogenic temperatures (145 K) and under several pressures rates (1~10 MPa) whilst ensuring the alignment between the specimens. We observed using indium as Thermal Interface Material reduced the TCR in 10~42,2% for SS316/Cu contacts, and 31~81% for Al/Cu. Upon analyzing the measurements, we identified some areas for improvements in the equipment, such as mitigating radiation and improving the heat flow in the cold part of the system that were implemented for the upgraded version.
	Poster TUPYP004 [2.549 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP004
About •	Received ※ 02 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 22 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP005	On the Performance of Cryogenic Cooling Systems for Optical Elements at Sirius/LNLS	40
	B.A. Francisco, M.P. Calcanha, R.R. Geraldes, L.M. Kofukuda, G.P. Lima, M. Saveri Silva, L.M. Volpe LNLS, Campinas, Brazil
	Funding: Ministry of Science, Technology and Innovation (MCTI) 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.
	Poster TUPYP005 [1.250 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP005
About •	Received ※ 24 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 22 November 2023 — Issued ※ 18 July 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP008	Exactly Constrained, High Heat Load Design for SABIA’s First Mirror	44
	V.B. Zilli, G.G. Basilio, J.C. Cezar, F.A. Del Nero, G.R.B. Ferreira, B.A. Francisco, M.E.O.A. Gardingo, R.R. Geraldes, A.C. Pinto, G.L.M.P. Rodrigues, L.M. Volpe, V.S. Ynamassu, R.G. de Oliveira LNLS, Campinas, Brazil C. Ambrosio CNPEM, Campinas, SP, Brazil
	Funding: Ministry of Science, Technology and Innovation (MCTI) The SABIA beamline (Soft x-ray ABsorption spectroscopy and ImAging) will operate in a range of 100 to 2000 eV and will perform XPS, PEEM and XMCD techniques at SIRIUS/LNLS. Thermal management on these soft x-ray beamlines is particularly challenging due to the high heat loads. SABIA’s first mirror (M1) absorbs about 360 W, with a maximum power density of 0.52 W/mm², and a water-cooled mirror was designed to handle this substantial heat load. To prolong the mirror operation lifetime, often shortened on soft X-ray beamlines due to carbon deposition on the mirror optical surface, a procedure was adopted using high partial pressure of O₂ into the vacuum chamber during the commissioning phase. The internal mechanism was designed to be exactly constrained using folded leaf springs. It presents one degree of freedom for control and alignment: a rotation around the vertical axis with a motion range of about ±0.6 mrad, provided by a piezoelectric actuator and measured using vacuum compatible linear encoders. This work describes the SABIA’s M1 exactly constrained, high heat absorbent design, its safety particularities compared to SIRIUS typical mirrors, and validation tests results.
	Poster TUPYP008 [1.582 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP008
About •	Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 21 February 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A Setup for the Evaluation of Thermal Contact Resistance at Cryogenic Temperatures Under Controlled Pressure Rates

37

B.A. Francisco, D.Y. Kakizaki, M. Saveri Silva, W.H. Wilendorf, V.B. Zilli, G.S. de Albuquerque
LNLS, Campinas, Brazil
V.C. Kuriyama
CNPEM, Campinas, SP, Brazil
A. Lopes Ribeiro
Federal University of Uberlandia, Uberlândia, M.G., Brazil
J.H. dos Santos
IF-UFRGS, Porto Alegre, Brazil

The design of optical elements compass different development areas, such as optics, structures and dynamics, thermal, and control. In particular, the thermal designs of mirrors aim to minimize deformations, whose usual requirements are around 5 nm RMS and slope errors in the order of 150 nrad RMS. One of the main sources of uncertainties in thermal designs is the inconsistency in values of thermal contact resistances (TCR) found in the literature. A device based on the ASTM D5470 standard was proposed and designed to measure the TCR among materials commonly used in mirror systems. Precision engineering design tools were used to deal with the challenges related to the operation at cryogenic temperatures (145 K) and under several pressures rates (1~10 MPa) whilst ensuring the alignment between the specimens. We observed using indium as Thermal Interface Material reduced the TCR in 10~42,2% for SS316/Cu contacts, and 31~81% for Al/Cu. Upon analyzing the measurements, we identified some areas for improvements in the equipment, such as mitigating radiation and improving the heat flow in the cold part of the system that were implemented for the upgraded version.

Poster TUPYP004 [2.549 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP004

About •

Received ※ 02 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 22 April 2024

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP005

On the Performance of Cryogenic Cooling Systems for Optical Elements at Sirius/LNLS

40

B.A. Francisco, M.P. Calcanha, R.R. Geraldes, L.M. Kofukuda, G.P. Lima, M. Saveri Silva, L.M. Volpe
LNLS, Campinas, Brazil

Funding: Ministry of Science, Technology and Innovation (MCTI)
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.

Poster TUPYP005 [1.250 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP005

About •

Received ※ 24 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 22 November 2023 — Issued ※ 18 July 2024

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP008

Exactly Constrained, High Heat Load Design for SABIA’s First Mirror

44

V.B. Zilli, G.G. Basilio, J.C. Cezar, F.A. Del Nero, G.R.B. Ferreira, B.A. Francisco, M.E.O.A. Gardingo, R.R. Geraldes, A.C. Pinto, G.L.M.P. Rodrigues, L.M. Volpe, V.S. Ynamassu, R.G. de Oliveira
LNLS, Campinas, Brazil
C. Ambrosio
CNPEM, Campinas, SP, Brazil

Funding: Ministry of Science, Technology and Innovation (MCTI)
The SABIA beamline (Soft x-ray ABsorption spectroscopy and ImAging) will operate in a range of 100 to 2000 eV and will perform XPS, PEEM and XMCD techniques at SIRIUS/LNLS. Thermal management on these soft x-ray beamlines is particularly challenging due to the high heat loads. SABIA’s first mirror (M1) absorbs about 360 W, with a maximum power density of 0.52 W/mm², and a water-cooled mirror was designed to handle this substantial heat load. To prolong the mirror operation lifetime, often shortened on soft X-ray beamlines due to carbon deposition on the mirror optical surface, a procedure was adopted using high partial pressure of O₂ into the vacuum chamber during the commissioning phase. The internal mechanism was designed to be exactly constrained using folded leaf springs. It presents one degree of freedom for control and alignment: a rotation around the vertical axis with a motion range of about ±0.6 mrad, provided by a piezoelectric actuator and measured using vacuum compatible linear encoders. This work describes the SABIA’s M1 exactly constrained, high heat absorbent design, its safety particularities compared to SIRIUS typical mirrors, and validation tests results.

Poster TUPYP008 [1.582 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP008

About •

Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 21 February 2024

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)