MEDSI2023 - List of Keywords (free-electron-laser)

Paper	Title	Other Keywords	Page
TUPYP047	Design of Liquid Injection Device for the Hard X-Ray Ultrafast Spectroscopy Experiment Station	experiment, FEL, electron, injection	97
	L.H. Li, B. Li, X. Liu, J.W. Meng, T.C. Weng, K.Y. Zhang, R.X. Zhu ShanghaiTech University, Shanghai, People’s Republic of China
	Funding: The National Natural Science Foundation of China (Grant NO.21727801), the Shanghai Sailing Program (No.22YF1454600). The Hard X-ray Ultrafast Spectroscopy Experiment Station (HXS) of the Shanghai high repetition rate XFEL and extreme light facility (SHINE) requires the design and manufacture of a specialized liquid sample injection device when studying the liquid phase state of matter. Due to the damage caused by high-repetition-rate XFEL pulses on the sample, it is necessary to ensure that the liquid sample is refreshed before the next pulse arrives. In order to reduce the impact of liquid film thickness on pump-probe ultrafast spectroscopy experiments, it is required that the liquid film thickness be less than 20 ¿m. This article describes the use of oblique collision of two jets, from simulation calculation to the construction of experimental device, and the use of absorption spectroscopy principle to construct a thickness characterization system. This system can stably produce ultrathin liquid films with thickness ranging from 3-20 ¿m. This article proposes views on the limitations and future improvements of this device.
	Poster TUPYP047 [0.494 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP047
About •	Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP012	Shape Optimization Design of Monochromator Pre-mirror in FEL-1 at S{³}FEL	FEL, laser, synchrotron, electron	293
	Z.M. Xu, C. Yang, W.Q. Zhang, Y.P. Zhong IASF, Shenzhen, Guangdong, People’s Republic of China
	For the monochromator pre-mirror in FEL-1 at S3FEL, the deformation induced by high heat load result in severe effects on the beam quality during its off-axis rotation. To meet the pre-mirror shape error requirement for X-ray coherent transport, an integra-tion of passive cooling and active heating systems for thermal management of the monochromator pre-mirror has been proposed, developed, and modelled. An ac-tive heating system with multiple electric heaters is adopted to compensate for the pre-mirror shape fur-ther. Finally, using MHCKF model, the optimization of multiple heat fluxes generated by all electric heaters was accomplished. The results show that the thermal management using passive cooling and active heat schemes is effective to obtain high-precision surface shape for the pre-mirror.
	Poster THPPP012 [0.772 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP012
About •	Received ※ 24 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP037	A Micro-Vibration Active Control Method Based on Piezoelectric Ceramic Actuator	controls, ISOL, quadrupole, electron	330
	Z. Lei, H.X. Deng, R. Deng SARI-CAS, Pudong, Shanghai, People’s Republic of China
	Funding: This work was supported by the CAS Project for Young Scientists in Basic Research (YSBR-042), the National Natural Science Foundation of China (12125508, 11935020) In linear accelerator, ground vibration is transmitted to beam element (quadrupole magnet, etc.) through support, and then reflected to the influence of beam orbit or effective emittance. In order to reduce the influence of ground vibration on beam orbit stability, an active vibration isolation platform can be used. In this paper, an active vibration isolation system is proposed, which realizes the inverse dynamic process based on a nano-positioning platform and combines with a proportional controller to reduce the transmission of ground-based excitation to the beam element. The absolute vibration velocity signal obtained from the sensor is input to the controller as feedforward signal. The controller processes the input signal and then the output signal drives the piezoelectric ceramic actuator to generate displacement, realizing the active vibration control. The test results of the prototype show that the active vibration isolation system can achieve 50% displacement attenuation, which indicates that the vibration control strategy has certain engineering application value in the construction of large accelerators.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP037
About •	Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 15 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP050	Overview of the Unified Undulator Solution for the PolFEL Project	undulator, FEL, electron, laser	349
	J.J. Wiechecki NSRC SOLARIS, Kraków, Poland P. Krawczyk, R. Nietubyc NCBJ, Świerk/Otwock, Poland P.R. Romanowicz, D.T. Ziemiański CUT, Kraków, Poland
	The PolFEL project, consisting of building a free electron laser, will be the first in Poland and one of the several sources in the world of coherent, tuneable electromagnetic radiation within the wide spectrum range from THz to VUV, emitted in pulses from femtoseconds to picoseconds, with high impulse power or high average power. The research infrastructure will include a free electron laser (FEL), a photocathode testing laboratory, end-stations, and laboratories necessary for the operation of the apparatus, and laboratories for users from the beamlines. The main FEL accelerator will consist of three independent branches, which will include chains of undulators adjusted to three different energy ranges: VUV, IR and THZ. The main challenge was the unification of the final undulator solution, so that it could be applied to all three branches. The main goal of this approach was to save time, costs, human and material resources. The overview of issues and solutions related to the construction of undulators for the PolFEL project, and the challenges that had to be fulfilled to reach the final design, is presented in this publication.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP050
About •	Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 25 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUPYP047

Design of Liquid Injection Device for the Hard X-Ray Ultrafast Spectroscopy Experiment Station

experiment, FEL, electron, injection

97

L.H. Li, B. Li, X. Liu, J.W. Meng, T.C. Weng, K.Y. Zhang, R.X. Zhu
ShanghaiTech University, Shanghai, People’s Republic of China

Funding: The National Natural Science Foundation of China (Grant NO.21727801), the Shanghai Sailing Program (No.22YF1454600).
The Hard X-ray Ultrafast Spectroscopy Experiment Station (HXS) of the Shanghai high repetition rate XFEL and extreme light facility (SHINE) requires the design and manufacture of a specialized liquid sample injection device when studying the liquid phase state of matter. Due to the damage caused by high-repetition-rate XFEL pulses on the sample, it is necessary to ensure that the liquid sample is refreshed before the next pulse arrives. In order to reduce the impact of liquid film thickness on pump-probe ultrafast spectroscopy experiments, it is required that the liquid film thickness be less than 20 ¿m. This article describes the use of oblique collision of two jets, from simulation calculation to the construction of experimental device, and the use of absorption spectroscopy principle to construct a thickness characterization system. This system can stably produce ultrathin liquid films with thickness ranging from 3-20 ¿m. This article proposes views on the limitations and future improvements of this device.

Poster TUPYP047 [0.494 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP047

About •

Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 December 2023

Cite •

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

THPPP012

Shape Optimization Design of Monochromator Pre-mirror in FEL-1 at S{³}FEL

FEL, laser, synchrotron, electron

293

Z.M. Xu, C. Yang, W.Q. Zhang, Y.P. Zhong
IASF, Shenzhen, Guangdong, People’s Republic of China

For the monochromator pre-mirror in FEL-1 at S3FEL, the deformation induced by high heat load result in severe effects on the beam quality during its off-axis rotation. To meet the pre-mirror shape error requirement for X-ray coherent transport, an integra-tion of passive cooling and active heating systems for thermal management of the monochromator pre-mirror has been proposed, developed, and modelled. An ac-tive heating system with multiple electric heaters is adopted to compensate for the pre-mirror shape fur-ther. Finally, using MHCKF model, the optimization of multiple heat fluxes generated by all electric heaters was accomplished. The results show that the thermal management using passive cooling and active heat schemes is effective to obtain high-precision surface shape for the pre-mirror.

Poster THPPP012 [0.772 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP012

About •

Received ※ 24 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 November 2023

Cite •

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

THPPP037

A Micro-Vibration Active Control Method Based on Piezoelectric Ceramic Actuator

controls, ISOL, quadrupole, electron

330

Z. Lei, H.X. Deng, R. Deng
SARI-CAS, Pudong, Shanghai, People’s Republic of China

Funding: This work was supported by the CAS Project for Young Scientists in Basic Research (YSBR-042), the National Natural Science Foundation of China (12125508, 11935020)
In linear accelerator, ground vibration is transmitted to beam element (quadrupole magnet, etc.) through support, and then reflected to the influence of beam orbit or effective emittance. In order to reduce the influence of ground vibration on beam orbit stability, an active vibration isolation platform can be used. In this paper, an active vibration isolation system is proposed, which realizes the inverse dynamic process based on a nano-positioning platform and combines with a proportional controller to reduce the transmission of ground-based excitation to the beam element. The absolute vibration velocity signal obtained from the sensor is input to the controller as feedforward signal. The controller processes the input signal and then the output signal drives the piezoelectric ceramic actuator to generate displacement, realizing the active vibration control. The test results of the prototype show that the active vibration isolation system can achieve 50% displacement attenuation, which indicates that the vibration control strategy has certain engineering application value in the construction of large accelerators.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP037

About •

Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 15 December 2023

Cite •

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

THPPP050

Overview of the Unified Undulator Solution for the PolFEL Project

undulator, FEL, electron, laser

349

J.J. Wiechecki
NSRC SOLARIS, Kraków, Poland
P. Krawczyk, R. Nietubyc
NCBJ, Świerk/Otwock, Poland
P.R. Romanowicz, D.T. Ziemiański
CUT, Kraków, Poland

The PolFEL project, consisting of building a free electron laser, will be the first in Poland and one of the several sources in the world of coherent, tuneable electromagnetic radiation within the wide spectrum range from THz to VUV, emitted in pulses from femtoseconds to picoseconds, with high impulse power or high average power. The research infrastructure will include a free electron laser (FEL), a photocathode testing laboratory, end-stations, and laboratories necessary for the operation of the apparatus, and laboratories for users from the beamlines. The main FEL accelerator will consist of three independent branches, which will include chains of undulators adjusted to three different energy ranges: VUV, IR and THZ. The main challenge was the unification of the final undulator solution, so that it could be applied to all three branches. The main goal of this approach was to save time, costs, human and material resources. The overview of issues and solutions related to the construction of undulators for the PolFEL project, and the challenges that had to be fulfilled to reach the final design, is presented in this publication.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP050

About •

Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 25 March 2024

Cite •

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