MEDSI2023 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
TUOBM05	The Progress in Design, Preparation and Measurement of MLL for HEPS	focusing, laser, target, interface	24
	S.P. Yue, G.C. Chang, Q. Hou, B. Ji, M. Li IHEP, People’s Republic of China
	Funding: This work was supported by the National Natural Science Foundation of China (Project12005250¿ The multilayer Laue lens (MLL) is a promising optical element with large numerical aperture and aspect ratio in synchrotron radiation facility. Two multilayers with 63(v)×43(h) ¿m2 aperture and focal spot size of 8.1(v)×8.1(h)nm2 at 10keV are fabricated by a 7-meter-long Laue lens deposition machine. Ultrafast laser etching, dicing and FIB are used to fabricate the multilayer into two-dimensional lenses meeting the requirement of diffraction dynamics. The multilayer grows flat without distortion and shows an amorphous structure characterized by TEM and SAED. The smallest accumulated layer position error is below ±5 nm in the whole area and the rms error is about 2.91nm by SEM and image processing. The focusing performance of MLL with actual film thickness is calculated by a method based on the Takagi¿Taupin description (TTD). The full width at half maximum(FWHM) of focus spot is 8.2×8.4 nm2 which is close to the theoretical result.
	Slides TUOBM05 [7.563 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUOBM05
About •	Received ※ 24 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 May 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP047	Design of Liquid Injection Device for the Hard X-Ray Ultrafast Spectroscopy Experiment Station	experiment, FEL, free-electron-laser, 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)

TUPYP048	A High Repetition Rate Free-electron Laser Shutter System	FEL, vacuum, laser, diagnostics	101
	J.C. Gu, H. Jiang, Y. Tong, Z. Wang ShanghaiTech University, Shanghai, People’s Republic of China
	The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is the first high repetition rate XFEL in China. It is a powerful tool for scientific research. However, the high repetition rate XFEL has a high peak power and average power. The high peak power can damage optics and devices in the optical path in femtosecond. And the high average power will cause the distortion of optics. Consequently, it becomes crucial to protect optics and devices in the optical path. This shutter system is designed to protect the diagnostics and avoid thermal distortion and thermal damage. It can control the number of pulses and average power on the diagnostics. The time window of shutter can be as small as 10 ms. It has can absorb most of FEL power.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP048
About •	Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 January 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP054	Mechanical Design of the Beam Gas Ionisation (BGI) Beam Profile Monitor for CERN Super Proton Synchrotron	vacuum, detector, impedance, proton	114
	M.T. Ramos Garcia, W. Andreazza, P. Bestmann, H. Bursali, N.S. Chritin, W. Devauchelle, A. Harrison, G. Khatri, M. McLean, C. Pasquino, F. Sanda, P. Schwarz, J.W. Storey, R. Veness, W. Vollenberg, C. Vollinger CERN, Meyrin, Switzerland
	The Beam Gas Ionisation (BGI) instrument of the Proton Synchrotron (PS), presently installed and operational, has been re-designed for the Super Proton Synchrotron (SPS), the following machine along the Large Hadron Collider (LHC) injector chain at CERN accelerator complex. Using the same detection technology, Timepix3, the SPS-BGI infers the beam profile from the electrons created by the ionisation of rest gas molecules and accelerated onto an imaging detector. This measurement method will allow for continuous, non-destructive beam size measurement in the SPS. In view of the upgrade, the design has been simplified and validated for integration, radio-frequency & impedance, high-voltage and ultra-high vacuum compatibility.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP054
About •	Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 14 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP012	Multiple Detector Stage at the MID Instrument of European XFEL	detector, vacuum, FEL, experiment	168
	A. Schmidt, G. Ansaldi, A. Bartmann, U. Boesenberg, J. Hallmann, A. Madsen, J. Möller, K. Sukharnikov EuXFEL, Schenefeld, Germany
	The Multiple Detector Stage (MDS) is an ancillary detector setup for the Materials Imaging and Dynamics (MID) instrument at the European X-Ray Free-Electron Laser Facility (EuXFEL). It is developed to improve the current capabilities concerning X-ray detection and make entirely new experiments possible. A unique feature of the MID instrument is the large flexibility in positioning of the AGIPD detector relative to the sample. This enables a large variety of instrument configurations ranging from small-angle (SAXS) to wide-angle (WAXS) X-ray scattering setups. A recurrent request from the users, which is currently not enabled, is the option of simultaneously recording both wide- and the small angle scattering by using two area detectors. The aim of developing MDS is to provide this missing capability at MID so that SAXS and WAXS experiments can be performed in parallel. The MDS will not be installed permanently at the instrument but only on request to provide as much flexibility as possible. In this article, the background and status of the MDS project is described in detail.
	Poster WEPPP012 [1.731 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP012
About •	Received ※ 10 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 23 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP013	Mechanical Design and Integration of the SXP Scientific Instrument at the European XFEL	FEL, experiment, laser, vacuum	172
	V.V. Vardanyan, D.G. Doblas-Jimenez, M. Dommach, P.G. Grychtol, M. Izquierdo, N. Kohlstrunk, D. La Civita, S. Molodtsov, O.J. Ohnesorge, T.E. Tikhodeeva, M. Vannoni EuXFEL, Schenefeld, Germany J. Buck, R.K. Rossnagel DESY, Hamburg, Germany S.G. Schönhense Johannes Gutenberg University Mainz, Institut für Physik, Mainz, Germany T.S. Thiess IEAP, Kiel, Germany
	The European XFEL provides femtosecond X-ray pulses with a MHz repetition rate in an extended photon energy range from 0.3 to 30 keV. Soft X-rays between 0.3 and 3 keV are produced in the SASE3 undulator system, enabling both spectroscopy and coherent diffraction imaging of atoms, molecules, clusters, ions and solids. The high repetition rate opens the possibility to perform femtosecond time-resolved photoelectron spectroscopy (TR-XPES) on solids. This technique allows the simultaneous understanding of the evolution of the electronic, chemical and atomic structure of solids upon an ultrafast excitation. The realization with soft X-rays requires the use of MHz FELs. In this contribution, we present the mechanical design and experimental realization of the SXP instrument. The main technical developments of the instrument components and the TR-XPES experimental setup are described.
	Poster WEPPP013 [1.253 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP013
About •	Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 12 March 2024
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, free-electron-laser	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, free-electron-laser	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, free-electron-laser, 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)

THPPP053	CLSI LINAC Upgrade Project	linac, operation, controls, RF-structure	355
	L.X. Lin, J.N. Campbell, S.R. Carriere, F. Le Pimpec, K.D. Wyatt CLS, Saskatoon, Saskatchewan, Canada
	The Canadian Light Source Inc. (CLSI) is undertaking a significant Linear Accelerator (LINAC) injector Up-grade Project to enhance both the mechanical reliability and operational stability of Canada’s primary re-search synchrotron facility. In late 2018, a critical gun failure led to a seven-month facility downtime. . This incident raised concerns that the original LINAC from 1980 continued to be a high risk to daily facility operations. Furthermore, several other mechanical systems within the facility, including cooling/heating water, HVAC, and certain aspects of the LINAC vacuum systems, have also aged, resulting in decreased reliability. The upgrade to the LINAC and its associated mechanical systems presents an opportunity to significantly improve the operational reliability of the entire facility.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP053
About •	Received ※ 20 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 June 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUOBM05

The Progress in Design, Preparation and Measurement of MLL for HEPS

focusing, laser, target, interface

24

S.P. Yue, G.C. Chang, Q. Hou, B. Ji, M. Li
IHEP, People’s Republic of China

Funding: This work was supported by the National Natural Science Foundation of China (Project12005250¿
The multilayer Laue lens (MLL) is a promising optical element with large numerical aperture and aspect ratio in synchrotron radiation facility. Two multilayers with 63(v)×43(h) ¿m2 aperture and focal spot size of 8.1(v)×8.1(h)nm2 at 10keV are fabricated by a 7-meter-long Laue lens deposition machine. Ultrafast laser etching, dicing and FIB are used to fabricate the multilayer into two-dimensional lenses meeting the requirement of diffraction dynamics. The multilayer grows flat without distortion and shows an amorphous structure characterized by TEM and SAED. The smallest accumulated layer position error is below ±5 nm in the whole area and the rms error is about 2.91nm by SEM and image processing. The focusing performance of MLL with actual film thickness is calculated by a method based on the Takagi¿Taupin description (TTD). The full width at half maximum(FWHM) of focus spot is 8.2×8.4 nm2 which is close to the theoretical result.

Slides TUOBM05 [7.563 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUOBM05

About •

Received ※ 24 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 May 2024

Cite •

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

TUPYP047

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

experiment, FEL, free-electron-laser, 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)

TUPYP048

A High Repetition Rate Free-electron Laser Shutter System

FEL, vacuum, laser, diagnostics

101

J.C. Gu, H. Jiang, Y. Tong, Z. Wang
ShanghaiTech University, Shanghai, People’s Republic of China

The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is the first high repetition rate XFEL in China. It is a powerful tool for scientific research. However, the high repetition rate XFEL has a high peak power and average power. The high peak power can damage optics and devices in the optical path in femtosecond. And the high average power will cause the distortion of optics. Consequently, it becomes crucial to protect optics and devices in the optical path. This shutter system is designed to protect the diagnostics and avoid thermal distortion and thermal damage. It can control the number of pulses and average power on the diagnostics. The time window of shutter can be as small as 10 ms. It has can absorb most of FEL power.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP048

About •

Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 January 2024

Cite •

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

TUPYP054

Mechanical Design of the Beam Gas Ionisation (BGI) Beam Profile Monitor for CERN Super Proton Synchrotron

vacuum, detector, impedance, proton

114

M.T. Ramos Garcia, W. Andreazza, P. Bestmann, H. Bursali, N.S. Chritin, W. Devauchelle, A. Harrison, G. Khatri, M. McLean, C. Pasquino, F. Sanda, P. Schwarz, J.W. Storey, R. Veness, W. Vollenberg, C. Vollinger
CERN, Meyrin, Switzerland

The Beam Gas Ionisation (BGI) instrument of the Proton Synchrotron (PS), presently installed and operational, has been re-designed for the Super Proton Synchrotron (SPS), the following machine along the Large Hadron Collider (LHC) injector chain at CERN accelerator complex. Using the same detection technology, Timepix3, the SPS-BGI infers the beam profile from the electrons created by the ionisation of rest gas molecules and accelerated onto an imaging detector. This measurement method will allow for continuous, non-destructive beam size measurement in the SPS. In view of the upgrade, the design has been simplified and validated for integration, radio-frequency & impedance, high-voltage and ultra-high vacuum compatibility.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP054

About •

Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 14 November 2023

Cite •

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

WEPPP012

Multiple Detector Stage at the MID Instrument of European XFEL

detector, vacuum, FEL, experiment

168

A. Schmidt, G. Ansaldi, A. Bartmann, U. Boesenberg, J. Hallmann, A. Madsen, J. Möller, K. Sukharnikov
EuXFEL, Schenefeld, Germany

The Multiple Detector Stage (MDS) is an ancillary detector setup for the Materials Imaging and Dynamics (MID) instrument at the European X-Ray Free-Electron Laser Facility (EuXFEL). It is developed to improve the current capabilities concerning X-ray detection and make entirely new experiments possible. A unique feature of the MID instrument is the large flexibility in positioning of the AGIPD detector relative to the sample. This enables a large variety of instrument configurations ranging from small-angle (SAXS) to wide-angle (WAXS) X-ray scattering setups. A recurrent request from the users, which is currently not enabled, is the option of simultaneously recording both wide- and the small angle scattering by using two area detectors. The aim of developing MDS is to provide this missing capability at MID so that SAXS and WAXS experiments can be performed in parallel. The MDS will not be installed permanently at the instrument but only on request to provide as much flexibility as possible. In this article, the background and status of the MDS project is described in detail.

Poster WEPPP012 [1.731 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP012

About •

Received ※ 10 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 23 March 2024

Cite •

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

WEPPP013

Mechanical Design and Integration of the SXP Scientific Instrument at the European XFEL

FEL, experiment, laser, vacuum

172

V.V. Vardanyan, D.G. Doblas-Jimenez, M. Dommach, P.G. Grychtol, M. Izquierdo, N. Kohlstrunk, D. La Civita, S. Molodtsov, O.J. Ohnesorge, T.E. Tikhodeeva, M. Vannoni
EuXFEL, Schenefeld, Germany
J. Buck, R.K. Rossnagel
DESY, Hamburg, Germany
S.G. Schönhense
Johannes Gutenberg University Mainz, Institut für Physik, Mainz, Germany
T.S. Thiess
IEAP, Kiel, Germany

The European XFEL provides femtosecond X-ray pulses with a MHz repetition rate in an extended photon energy range from 0.3 to 30 keV. Soft X-rays between 0.3 and 3 keV are produced in the SASE3 undulator system, enabling both spectroscopy and coherent diffraction imaging of atoms, molecules, clusters, ions and solids. The high repetition rate opens the possibility to perform femtosecond time-resolved photoelectron spectroscopy (TR-XPES) on solids. This technique allows the simultaneous understanding of the evolution of the electronic, chemical and atomic structure of solids upon an ultrafast excitation. The realization with soft X-rays requires the use of MHz FELs. In this contribution, we present the mechanical design and experimental realization of the SXP instrument. The main technical developments of the instrument components and the TR-XPES experimental setup are described.

Poster WEPPP013 [1.253 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP013

About •

Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 12 March 2024

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, free-electron-laser

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, free-electron-laser

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, free-electron-laser, 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)

THPPP053

CLSI LINAC Upgrade Project

linac, operation, controls, RF-structure

355

L.X. Lin, J.N. Campbell, S.R. Carriere, F. Le Pimpec, K.D. Wyatt
CLS, Saskatoon, Saskatchewan, Canada

The Canadian Light Source Inc. (CLSI) is undertaking a significant Linear Accelerator (LINAC) injector Up-grade Project to enhance both the mechanical reliability and operational stability of Canada’s primary re-search synchrotron facility. In late 2018, a critical gun failure led to a seven-month facility downtime. . This incident raised concerns that the original LINAC from 1980 continued to be a high risk to daily facility operations. Furthermore, several other mechanical systems within the facility, including cooling/heating water, HVAC, and certain aspects of the LINAC vacuum systems, have also aged, resulting in decreased reliability. The upgrade to the LINAC and its associated mechanical systems presents an opportunity to significantly improve the operational reliability of the entire facility.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP053

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Received ※ 20 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 June 2024

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