MEDSI2023 - List of Keywords (SRF)

Paper	Title	Other Keywords	Page
TUOAM02	Update of the BM18 ESRF Beamline Development: Presentation of Selected Equipment and Their Commissioning	detector, vacuum, experiment, MMI	1
	F. Cianciosi, A.-L. Buisson, P. Carceller, P. Tafforeau, P. Van Vaerenbergh ESRF, Grenoble, France
	This article highlights specific equipment that have not yet been described in previous publications, notably the in-vacuum cooled fast shutter for high-energy, the wide aluminium window and tailored high-precision slits (400x200 mm opening). 2022 and 2023 have seen the installation and commissioning of these new equipment. The ID18 beamline opened for user applications in September 2022 with limited capabilities and has been increasing its possibilities since then. It is expected to be fully equipped by the end of 2024.
	Slides TUOAM02 [187.155 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUOAM02
About •	Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 08 July 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP055	Application of QXAFS in the Medium-Energy X-ray Absorption Spectroscopy	experiment, synchrotron, data-acquisition, synchrotron-radiation	118
	Y.H. Xia, J.F. Chang, S.Q. Chu, S.H. Liu, F.F. Yang, G.K. Zhang, H.Y. Zhang, J. Zhang, L. Zheng IHEP, Beijing, People’s Republic of China
	X-ray absorption fine-structure (XAFS) spectroscopy, including X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), is an important experimental method at synchrotron radiation facilities, which has been applied in scientific research and industry applications. Traditional XAFS spectrum is obtained by controlling the rotation of the monochromator by a stepper driver, then measuring the absorption coefficient of each energy point. While in quick-scanning XAFS (QXAFS), the angle of the monochromator moves continuously and quickly, greatly reducing the spectral acquisition time. It has become a powerful tool to study in-situ dynamic processes. Currently QXAFS is mainly used in hard X-ray absorption spectroscopy beamlines of synchrotron radiation facilities, here we have developed a QXAFS system in the medium-energy X-ray beamlines, which will improve the function of XAFS beamlines and extend their capabilities to a wider user community.
	Poster TUPYP055 [0.689 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP055
About •	Received ※ 04 November 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOBM02	Development of the Bent Focusing Mirror in HEPS from Design to Test	focusing, ECR, synchrotron, photon	136
	M.W. Chen, M. Li, S. Tang, F.G. Yang IHEP, People’s Republic of China
	The focusing mirrors are important for each beamline in the 4th generation photon source. One bent focusing face-down mirror in HEPS is taken for an example to be introduced from the design to the test. The effect of the gravity of the mirror is considered in the design. Moreover, for the sake of the compromise between the processing and the precision, the polygonal structure is adopted. Also, the iteration of the solution is improved to increase the design efficiency. The results reveal that the theoretical precision of the mirror after bending can reach less than 100 nrad RMS. In the aspect of the mechanics, the scheme of four roller bender comes out to avoid the parasitic moment, and the movable component in the bender are all coated with the MoS2. As the type of the measurement is facing side which is different from the type of the actual condition, the effect of the gravity must be included in the metrology results. In the meantime, the stability and the repeatability are also measured. The result can be converged to around 200 nrad RMS, which is less than the required error. The stability, ¿R/R, can be constrained under the 0.6%, showing the outstanding performance.
	Slides WEOBM02 [3.638 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM02
About •	Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 16 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP004	High Heat Load Transfocator for the New ID14 ESRF Beamline	alignment, undulator, collimation, focusing	158
	L. Eybert, P. Brumund, J. Reyes-Herrera ESRF, Grenoble, France
	X ray refractive lenses (CRL) are powerful in-line optics for focusing x-rays. They offer many advantages such as compactness, a comfortable working distance, robustness, and are suitable for use in a wide range of energy. In the scope of the new nuclear resonance ID14 beamline at ESRF, a new transfocator was developed. This transfocator benefits from the previous experience of ESRF’s transfocators to withstand the high power densities (645W/mm2) and total power (405W) generated by the future CPMU18 and the high positioning tolerance required = <± 20µm within the same LCR assembly and between different assemblies. A thermal load analysis was carried out to optimize the cooling design for both 1D and 2D Beryllium lenses unit assembly. The tight alignment specifications was achieved thanks a good machining of both lenses unit mechanical assembly and reference V shaped rail. High positioning repeatability of CRLs actuator is assured by an optimized flexor and a good alignment procedure. The transfocator vessel is installed on a granite and a 4-DOF alignment table.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP004
About •	Received ※ 27 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 January 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP024	Design of a Hard X-Ray Nanoprobe based on FZP	vacuum, controls, optics, detector	184
	K.L. Liao, P.Y. Li, M.H. Song Jinan Hanjiang Opto-Electronics Technology Company Ltd., Jinan, People’s Republic of China Q.L. He, P.P. Zhu IHEP, Beijing, People’s Republic of China W.Q. Hua, P. Zhou SARI-CAS, Pudong, Shanghai, People’s Republic of China L. Luo TUB, Beijing, People’s Republic of China
	A high-resolution hard X-ray nanoprobe (HXNP) based on Fresnel Zone plate (FZP) was designed. The HXNP relies on a compact, high stiffness, low heat dissipation and low vibration design philosophy and utilizes FZP as nanofocusing optics. The optical layout and overall mechanical design of the HXNP were introduced. Several important modules, such as probe module, sample module, interferometer module and vacuum chambers were discussed in detail.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP024
About •	Received ※ 02 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 12 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP025	Application of CuCrZr in the Front-end of Shanghai Synchrotron Radiation Facility	synchrotron, vacuum, radiation, synchrotron-radiation	187
	S. Wu, Y. Li, J.N. Liu, J.W. Wang SARI-CAS, Pudong, Shanghai, People’s Republic of China
	Glidcop, oxygen free copper and other materials are mainly used in the Front-end of the Shanghai Synchrotron Radiation Facility(SSRF). CuCrZr material has high heat load capacity, high yield strength and tensile strength, good thermal conductivity and low vacuum outgassing rate. At present, it has been used as a heat sink material in the heat exchanger of nuclear reactors. In this paper, based on the previous process exploration, the Front-end absorber is made of CuCrZr material, and the technical scheme of integral processing of flange and absorber is adopted. The thermal stress and deformation of CuCrZr absorber are analyzed by finite element method, and the processing of CuCrZr absorber is completed, and it is applied to the SSRF BL04Ucanted front end. After a period of electron beam cleaning, vacuum and temperature tests were carried out under high thermal load power, and the characteristics of the material in practical use were analyzed, which proved that CuCrZr material can be used in SSRF under high heat load.
	Poster WEPPP025 [0.815 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP025
About •	Received ※ 01 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 08 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP044	Development of High Power Density Photon Absorber for Super-B Sections in SSRF	photon, vacuum, radiation, storage-ring	215
	Q. Tang, Y. Liu, Q.L. Zhang, Y.L. Zhao SARI-CAS, Pudong, Shanghai, People’s Republic of China C. Jin SKY Technology Development Co., Ltd. Chinese Academy of Sciences, Shengyang, People’s Republic of China
	There are two symmetrical standard bend sections been updated to super-bend sections in the storage of Shanghai Synchrotron Radiation Facility(SSRF). Photon absorbers made up of CuCrZr were used for absorbing radiation with very high power density in the super-bend sections. Meanwhile, CuCrZr absorbers were also used as beam chamber and pump port for the lattice of super-bend section is very compacted. The absorbing surface was designed as serrate structure in order to diminish the power density. CuCrZr was cold-forged before machining to enhance its strength, thermal conductivity and hardness. Friction welding is adopted for absorber fabrication to avoid the material properties of absorber deterioration. Rectangle flanges of absorbers were designed as step rather than knifer for vacuum seal. These high power density photon absorbers have been installed on the storage ring, both pressure and temperature being in accordance with design anticipation in the case of beam of 240 mA running.
	Poster WEPPP044 [1.597 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP044
About •	Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 02 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP007	Optimizing Indirect Cooling of a High Accuracy Surface Plane Mirror in Plane-Grating Monochromator	synchrotron, optics, brightness, ECR	280
	J. Chen, X.W. Du, M.H. Lin, Q.P. Wang, Z. Wang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Funding: This work is supported by the Chinese Academy of Science (CAS) and the Anhui province government for key techniques R&D of Hefei Advanced Light Facility. For the cooling of the plane mirror in VIA-PGMs (var-iable-included-angle plane-grating monochromators), the top-side indirect cooling based on water is preferred for its advantages, such as cheaper, easier to use, smart notches, etc, when compared to the internal cooling. But it also arises challenges to control the RMS residual slope error of the mirror, whose requirement is less than 100 nano-radian. This requirement is even hard to fulfill, when combined with 1) the asymmetry thermal defor-mation on the meridian of the footprint area during the energy scanning, 2) the high heat load deduced by the synchrotron light and 3) the no obvious effects of the classical optimizations, such as increasing footprint size, cooling efficiency or adding smart notches. An effective way was found after numerous attempts, which is to make the footprint area far from the mirror¿s edge to reduce the asymmetry of the thermal deformation except for leading to a longer mirror. This paper will illustrate how the asymmetry affects the mirror¿s residual slope error and then, focus on the relationship among the asymmetry of cooling and the distance to provide a ref-erence for optical cooling.
	Poster THPPP007 [1.805 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP007
About •	Received ※ 26 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 04 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP010	Mechanical Analysis and Tests of Austenitic Stainless Steel Bolts for Beamline Flange Connection	FEL, cryogenics, vacuum, experiment	290
	T.T. Zhen, H.X. Deng, R. Deng, F. Gao, L.J. Lu, S. Sun SARI-CAS, Pudong, Shanghai, People’s Republic of China
	Cryogenic tests of 1.3GHz superconducting accelerator cryomodule for the Shanghai Hard X-ray Free Electron Laser Installation Project(SHINE) are in progress. For better performance, a study of mechanical analysis and tests of austenitic stainless steel bolts for beamline flange connection has been done in preliminary work. In order to satisfy the residual magnetism and strength, high-strength austenitic stainless steel bolts are selected. For higher sealing performance, the torque coefficient is determined by compression test, the lower limit of yield of the bolts is obtained by tensile test, then the maximum torque applied to the bolts under real working conditions can be obtained according to the relationship between preload and torque. A finite element model is established to get the deformation curve of the gasket, and the measured results of gasket thickness are compared to ensure the reliability of the simulation. The deformation curve of the gasket is used to calculate the change of compression force under the temperature cycling load(cool down and warm-up). Finally, the results of residual magnetism show that the bolts have a negligible effect on magnetic field.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP010
About •	Received ※ 25 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP035	Mechanical System of the U26 Undulator Prototype for SHINE	FEL, undulator, alignment, linac	325
	S.W. Xiang, H.X. Deng, R. Deng, Z.Q. Jiang, Y.Y. Lei, J.Y. Yang, W. Zhang, T.T. Zhen, S.D. Zhou SARI-CAS, Pudong, Shanghai, People’s Republic of China
	The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is under construction and aims at generating X-rays between 0.4 and 25 keV with three FEL beamlines at repetition rates of up to 1 MHz[1-3]. The three undulator lines of the SHINE are referred to as the FEL-I, FEL-II, and FEL-III. Shanghai Synchrotron Radiation Facility(SSRF) will manufacture a total of 42 undulators (U26) with a period length of 26mm for FEL-I and 22 undulators (U55) with a period length of 55mm for FEL-II. Both the U26 and U55 are 4m long and use a common mechanical system. By using the specially designed double lever compensation springs can eliminate different magnetic force on the drive units. A U26 prototype has been developed and tested at SSRF. This paper describes the mechanical system design¿simulation and testing results of the U26 prototype, as well as its compatibility with U55.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP035
About •	Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 11 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUOAM02

Update of the BM18 ESRF Beamline Development: Presentation of Selected Equipment and Their Commissioning

detector, vacuum, experiment, MMI

1

F. Cianciosi, A.-L. Buisson, P. Carceller, P. Tafforeau, P. Van Vaerenbergh
ESRF, Grenoble, France

This article highlights specific equipment that have not yet been described in previous publications, notably the in-vacuum cooled fast shutter for high-energy, the wide aluminium window and tailored high-precision slits (400x200 mm opening). 2022 and 2023 have seen the installation and commissioning of these new equipment. The ID18 beamline opened for user applications in September 2022 with limited capabilities and has been increasing its possibilities since then. It is expected to be fully equipped by the end of 2024.

Slides TUOAM02 [187.155 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUOAM02

About •

Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 08 July 2024

Cite •

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

TUPYP055

Application of QXAFS in the Medium-Energy X-ray Absorption Spectroscopy

experiment, synchrotron, data-acquisition, synchrotron-radiation

118

Y.H. Xia, J.F. Chang, S.Q. Chu, S.H. Liu, F.F. Yang, G.K. Zhang, H.Y. Zhang, J. Zhang, L. Zheng
IHEP, Beijing, People’s Republic of China

X-ray absorption fine-structure (XAFS) spectroscopy, including X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), is an important experimental method at synchrotron radiation facilities, which has been applied in scientific research and industry applications. Traditional XAFS spectrum is obtained by controlling the rotation of the monochromator by a stepper driver, then measuring the absorption coefficient of each energy point. While in quick-scanning XAFS (QXAFS), the angle of the monochromator moves continuously and quickly, greatly reducing the spectral acquisition time. It has become a powerful tool to study in-situ dynamic processes. Currently QXAFS is mainly used in hard X-ray absorption spectroscopy beamlines of synchrotron radiation facilities, here we have developed a QXAFS system in the medium-energy X-ray beamlines, which will improve the function of XAFS beamlines and extend their capabilities to a wider user community.

Poster TUPYP055 [0.689 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP055

About •

Received ※ 04 November 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 November 2023

Cite •

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

WEOBM02

Development of the Bent Focusing Mirror in HEPS from Design to Test

focusing, ECR, synchrotron, photon

136

M.W. Chen, M. Li, S. Tang, F.G. Yang
IHEP, People’s Republic of China

The focusing mirrors are important for each beamline in the 4th generation photon source. One bent focusing face-down mirror in HEPS is taken for an example to be introduced from the design to the test. The effect of the gravity of the mirror is considered in the design. Moreover, for the sake of the compromise between the processing and the precision, the polygonal structure is adopted. Also, the iteration of the solution is improved to increase the design efficiency. The results reveal that the theoretical precision of the mirror after bending can reach less than 100 nrad RMS. In the aspect of the mechanics, the scheme of four roller bender comes out to avoid the parasitic moment, and the movable component in the bender are all coated with the MoS2. As the type of the measurement is facing side which is different from the type of the actual condition, the effect of the gravity must be included in the metrology results. In the meantime, the stability and the repeatability are also measured. The result can be converged to around 200 nrad RMS, which is less than the required error. The stability, ¿R/R, can be constrained under the 0.6%, showing the outstanding performance.

Slides WEOBM02 [3.638 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM02

About •

Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 16 April 2024

Cite •

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

WEPPP004

High Heat Load Transfocator for the New ID14 ESRF Beamline

alignment, undulator, collimation, focusing

158

L. Eybert, P. Brumund, J. Reyes-Herrera
ESRF, Grenoble, France

X ray refractive lenses (CRL) are powerful in-line optics for focusing x-rays. They offer many advantages such as compactness, a comfortable working distance, robustness, and are suitable for use in a wide range of energy. In the scope of the new nuclear resonance ID14 beamline at ESRF, a new transfocator was developed. This transfocator benefits from the previous experience of ESRF’s transfocators to withstand the high power densities (645W/mm2) and total power (405W) generated by the future CPMU18 and the high positioning tolerance required = <± 20µm within the same LCR assembly and between different assemblies. A thermal load analysis was carried out to optimize the cooling design for both 1D and 2D Beryllium lenses unit assembly. The tight alignment specifications was achieved thanks a good machining of both lenses unit mechanical assembly and reference V shaped rail. High positioning repeatability of CRLs actuator is assured by an optimized flexor and a good alignment procedure. The transfocator vessel is installed on a granite and a 4-DOF alignment table.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP004

About •

Received ※ 27 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 January 2024

Cite •

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

WEPPP024

Design of a Hard X-Ray Nanoprobe based on FZP

vacuum, controls, optics, detector

184

K.L. Liao, P.Y. Li, M.H. Song
Jinan Hanjiang Opto-Electronics Technology Company Ltd., Jinan, People’s Republic of China
Q.L. He, P.P. Zhu
IHEP, Beijing, People’s Republic of China
W.Q. Hua, P. Zhou
SARI-CAS, Pudong, Shanghai, People’s Republic of China
L. Luo
TUB, Beijing, People’s Republic of China

A high-resolution hard X-ray nanoprobe (HXNP) based on Fresnel Zone plate (FZP) was designed. The HXNP relies on a compact, high stiffness, low heat dissipation and low vibration design philosophy and utilizes FZP as nanofocusing optics. The optical layout and overall mechanical design of the HXNP were introduced. Several important modules, such as probe module, sample module, interferometer module and vacuum chambers were discussed in detail.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP024

About •

Received ※ 02 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 12 April 2024

Cite •

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

WEPPP025

Application of CuCrZr in the Front-end of Shanghai Synchrotron Radiation Facility

synchrotron, vacuum, radiation, synchrotron-radiation

187

S. Wu, Y. Li, J.N. Liu, J.W. Wang
SARI-CAS, Pudong, Shanghai, People’s Republic of China

Glidcop, oxygen free copper and other materials are mainly used in the Front-end of the Shanghai Synchrotron Radiation Facility(SSRF). CuCrZr material has high heat load capacity, high yield strength and tensile strength, good thermal conductivity and low vacuum outgassing rate. At present, it has been used as a heat sink material in the heat exchanger of nuclear reactors. In this paper, based on the previous process exploration, the Front-end absorber is made of CuCrZr material, and the technical scheme of integral processing of flange and absorber is adopted. The thermal stress and deformation of CuCrZr absorber are analyzed by finite element method, and the processing of CuCrZr absorber is completed, and it is applied to the SSRF BL04Ucanted front end. After a period of electron beam cleaning, vacuum and temperature tests were carried out under high thermal load power, and the characteristics of the material in practical use were analyzed, which proved that CuCrZr material can be used in SSRF under high heat load.

Poster WEPPP025 [0.815 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP025

About •

Received ※ 01 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 08 December 2023

Cite •

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

WEPPP044

Development of High Power Density Photon Absorber for Super-B Sections in SSRF

photon, vacuum, radiation, storage-ring

215

Q. Tang, Y. Liu, Q.L. Zhang, Y.L. Zhao
SARI-CAS, Pudong, Shanghai, People’s Republic of China
C. Jin
SKY Technology Development Co., Ltd. Chinese Academy of Sciences, Shengyang, People’s Republic of China

There are two symmetrical standard bend sections been updated to super-bend sections in the storage of Shanghai Synchrotron Radiation Facility(SSRF). Photon absorbers made up of CuCrZr were used for absorbing radiation with very high power density in the super-bend sections. Meanwhile, CuCrZr absorbers were also used as beam chamber and pump port for the lattice of super-bend section is very compacted. The absorbing surface was designed as serrate structure in order to diminish the power density. CuCrZr was cold-forged before machining to enhance its strength, thermal conductivity and hardness. Friction welding is adopted for absorber fabrication to avoid the material properties of absorber deterioration. Rectangle flanges of absorbers were designed as step rather than knifer for vacuum seal. These high power density photon absorbers have been installed on the storage ring, both pressure and temperature being in accordance with design anticipation in the case of beam of 240 mA running.

Poster WEPPP044 [1.597 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP044

About •

Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 02 April 2024

Cite •

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

THPPP007

Optimizing Indirect Cooling of a High Accuracy Surface Plane Mirror in Plane-Grating Monochromator

synchrotron, optics, brightness, ECR

280

J. Chen, X.W. Du, M.H. Lin, Q.P. Wang, Z. Wang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Funding: This work is supported by the Chinese Academy of Science (CAS) and the Anhui province government for key techniques R&D of Hefei Advanced Light Facility.
For the cooling of the plane mirror in VIA-PGMs (var-iable-included-angle plane-grating monochromators), the top-side indirect cooling based on water is preferred for its advantages, such as cheaper, easier to use, smart notches, etc, when compared to the internal cooling. But it also arises challenges to control the RMS residual slope error of the mirror, whose requirement is less than 100 nano-radian. This requirement is even hard to fulfill, when combined with 1) the asymmetry thermal defor-mation on the meridian of the footprint area during the energy scanning, 2) the high heat load deduced by the synchrotron light and 3) the no obvious effects of the classical optimizations, such as increasing footprint size, cooling efficiency or adding smart notches. An effective way was found after numerous attempts, which is to make the footprint area far from the mirror¿s edge to reduce the asymmetry of the thermal deformation except for leading to a longer mirror. This paper will illustrate how the asymmetry affects the mirror¿s residual slope error and then, focus on the relationship among the asymmetry of cooling and the distance to provide a ref-erence for optical cooling.

Poster THPPP007 [1.805 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP007

About •

Received ※ 26 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 04 March 2024

Cite •

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

THPPP010

Mechanical Analysis and Tests of Austenitic Stainless Steel Bolts for Beamline Flange Connection

FEL, cryogenics, vacuum, experiment

290

T.T. Zhen, H.X. Deng, R. Deng, F. Gao, L.J. Lu, S. Sun
SARI-CAS, Pudong, Shanghai, People’s Republic of China

Cryogenic tests of 1.3GHz superconducting accelerator cryomodule for the Shanghai Hard X-ray Free Electron Laser Installation Project(SHINE) are in progress. For better performance, a study of mechanical analysis and tests of austenitic stainless steel bolts for beamline flange connection has been done in preliminary work. In order to satisfy the residual magnetism and strength, high-strength austenitic stainless steel bolts are selected. For higher sealing performance, the torque coefficient is determined by compression test, the lower limit of yield of the bolts is obtained by tensile test, then the maximum torque applied to the bolts under real working conditions can be obtained according to the relationship between preload and torque. A finite element model is established to get the deformation curve of the gasket, and the measured results of gasket thickness are compared to ensure the reliability of the simulation. The deformation curve of the gasket is used to calculate the change of compression force under the temperature cycling load(cool down and warm-up). Finally, the results of residual magnetism show that the bolts have a negligible effect on magnetic field.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP010

About •

Received ※ 25 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 November 2023

Cite •

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

THPPP035

Mechanical System of the U26 Undulator Prototype for SHINE

FEL, undulator, alignment, linac

325

S.W. Xiang, H.X. Deng, R. Deng, Z.Q. Jiang, Y.Y. Lei, J.Y. Yang, W. Zhang, T.T. Zhen, S.D. Zhou
SARI-CAS, Pudong, Shanghai, People’s Republic of China

The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is under construction and aims at generating X-rays between 0.4 and 25 keV with three FEL beamlines at repetition rates of up to 1 MHz[1-3]. The three undulator lines of the SHINE are referred to as the FEL-I, FEL-II, and FEL-III. Shanghai Synchrotron Radiation Facility(SSRF) will manufacture a total of 42 undulators (U26) with a period length of 26mm for FEL-I and 22 undulators (U55) with a period length of 55mm for FEL-II. Both the U26 and U55 are 4m long and use a common mechanical system. By using the specially designed double lever compensation springs can eliminate different magnetic force on the drive units. A U26 prototype has been developed and tested at SSRF. This paper describes the mechanical system design¿simulation and testing results of the U26 prototype, as well as its compatibility with U55.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP035

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Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 11 December 2023

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