FLS2023 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
MO3B3	Bunch-lengthening RF System Using Active Normal-conducting Cavities	cavity, kicker, synchrotron, beam-loading	18
	N. Yamamoto, D. Naito, S. Sakanaka, T. Yamaguchi KEK, Ibaraki, Japan A. Gamelin, P. Marchand SOLEIL, Gif-sur-Yvette, France
	Bunch lengthening using a double RF system (fundamental + harmonic cavities) is essential in preserving the extremely low emittance in fourth and future generation synchrotron light rings. Recent studies have revealed that, in many cases, unstable beam motions, as so-called "mode-0" and "periodic transient beam loading" instabilities, prevent from reaching the optimum bunch lengthening condition with low and high beam current, respectively, even in symmetric filling patterns. While reducing the R/Q is beneficial for the latter, it will worsen the former. To achieve an efficient bunch lengthening system, we proposed a promising solution based on a powered TM020-type harmonic cavity with RF feedbacks (RF-FBs), as reported at FLS2018. Based on this concept, we are developing both fundamental and harmonic cavities using the TM020 resonant mode, a kicker cavity having a bandwidth >5MHz, bunch-phase monitor (BPhM) and RF-FBs. In this presentation, we describe our overall bunch lengthening system including cavity and BPhM designs. We also present particle tracking simulation results demonstrating that the bunch lengthening limitations can be alleviated by means of direct RF-FBs*. N. Yamamoto et al., PRAB 21, 012001, 2018. T. Yamaguchi et al., accepted in NIM A. * D. Naito et al, IPAC2021, MOPSB331, 2021. **** N. Yamamoto et al., IPAC23, WEPL161, 2023.
	Slides MO3B3 [2.655 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO3B3
About •	Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU3B3	Pyapas: A New Framework for High Level Application Development at HEPS	framework, MMI, linac, booster	77
	X.H. Lu IHEP CSNS, Guangdong Province, People’s Republic of China D. Ji, H.F. Ji, Y. Jiao, J.Y. Li, N. Li, C. Meng, Y.M. Peng, J. Wan, Y. Wei, G. Xu, H.S. Xu, Y.L. Zhao IHEP, Beijing, People’s Republic of China
	The development of high-level application (HLA) is an indispensable part of the light source construction process. With the increase in the scale and complexity of accelerators, the development of HLA will also face many new challenges, such as increased data volume, multiple data types, more parameter channels, and more complex tuning algorithms. So a new framework named Pyapas has been designed for HLA development which aims to provide a high-performance, scalable, flexible, and reliable HLA development framework to meet the needs of large-scale parameter tuning and data processing. Pyapas is designed with a modular concept, decomposing the development needs of HLA into different modules for decoupled development, and calling them through simple interfaces. In the communication module, a singleton factory class is designed to avoid duplicate creation of channel connections, and combined with Qt’s signal-slot mechanism to create non-blocking communication connections, greatly improving the carrying capacity of parameter scale. While a deeply decoupled two-layer physical model module is designed to quickly switch different mathematical models to meet different online computing needs. Moreover, the design of the C/S architecture development module and the rapid creation and management module of the database is helpful for quickly developing complex programs, further enhancing the applicability of Pyapas. This paper will introduce the main feature of Pyapas
	Slides TU3B3 [6.913 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU3B3
About •	Received ※ 30 August 2023 — Revised ※ 31 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WE4P37	Laser Interferometer for Hall Probe Alignment and Measurement of Undulator	laser, undulator, alignment, software	215
	S.M. Khan, G. Mishra Devi Ahilya University, Indore, India M. Gehlot DESY, Hamburg, Germany S. Mishra Devi Ahilya Vishwa Vidyalaya, Institute of Engineering & Technology, Indore, India
	In the Hall probe Magnetic measurement method the field mapping is done along the length of the undulator. The field integral and phase error computed from the field mapping works as the figure of merit of the undulator. In this paper, we discuss the working of a laser interferometer for precise Hall probe alignment. A new user friendly software based on MATLAB has been developed. The phase error and magnetic field integrals are calculated for both taper and untaper U50 undulator of the Laser and Insertion Device Application (LIDA) Laboratory.
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P37
About •	Received ※ 22 August 2023 — Revised ※ 22 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1D2	A Bulk Superconductor and its Application to Insertion Devices	undulator, solenoid, permanent-magnet, experiment	224
	T. Kii Kyoto University, Kyoto, Japan
	Funding: This work was supported by KAKENHI JP17H01127 and JP22H03870 High-field short-period undulator will be one of the key technologies for the future light sources. Various approaches have been continued under the limitation of materials for permanent/superconducting magnets. A use of bulk superconductor is attractive for its high current density under existence of high magnetic field. The critical current density for rare-earth barium copper oxide (REBCO) bulk superconductor exceeds 10 kA/mm2 even at 10 K in a field range below about 3 T and exceeds 20 kA/mm2 at 4.2 K. In order to utilize the quite high current density in the bulk REBCO and to generate periodic magnetic field we proposed bulk superconductor staggered array undulator in 2006. Recently we have developed the third undulaor prototype which consists of 6T solenoid and 6 period of bulk REBCO array, and successfully demonstrated periodic field amplitude of 2.22 T for period length of 10 mm and undulator gap of 4.0 mm at 7 K. In the presentation, we will summarize properties and performances of bulk REBCO superconductors and discuss on the performance of bulk superconductor staggered array undulator and potential as an insertion device for the future light sources. T. Kii et al.: Proc. FEL2006 (2006) p. 653.
	Slides TH1D2 [2.682 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH1D2
About •	Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3D3	How Can Machine Learning Help Future Light Sources?	operation, electron, laser, feedback	249
	A. Santamaria Garcia, E. Bründermann, M. Caselle, A.-S. Müller, L. Scomparin, C. Xu KIT, Karlsruhe, Germany G. De Carne Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
	Machine learning (ML) is one of the key technologies that can considerably extend and advance the capabilities of particle accelerators and needs to be included in their future design. Future light sources aim to reach unprecedented beam brightness and radiation coherence, which require challenging beam sizes and accelerating gradients. The sensitive designs and complex operation modes that arise from such demands will impact the beam availability and flexibility for the users, and can render future accelerators inefficient. ML brings a paradigm shift that can re-define how accelerators are operated. In this contribution we introduce the vision of ML-driven facilities for future accelerators, address some challenges of future light sources, and show an example of how such methods can be used to control beam instabilities.
	Slides TH3D3 [5.398 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH3D3
About •	Received ※ 23 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MO3B3

Bunch-lengthening RF System Using Active Normal-conducting Cavities

cavity, kicker, synchrotron, beam-loading

18

N. Yamamoto, D. Naito, S. Sakanaka, T. Yamaguchi
KEK, Ibaraki, Japan
A. Gamelin, P. Marchand
SOLEIL, Gif-sur-Yvette, France

Bunch lengthening using a double RF system (fundamental + harmonic cavities) is essential in preserving the extremely low emittance in fourth and future generation synchrotron light rings. Recent studies have revealed that, in many cases, unstable beam motions, as so-called "mode-0" and "periodic transient beam loading" instabilities, prevent from reaching the optimum bunch lengthening condition with low and high beam current, respectively, even in symmetric filling patterns. While reducing the R/Q is beneficial for the latter, it will worsen the former. To achieve an efficient bunch lengthening system, we proposed a promising solution based on a powered TM020-type harmonic cavity with RF feedbacks (RF-FBs)*, as reported at FLS2018. Based on this concept, we are developing both fundamental and harmonic cavities using the TM020 resonant mode**, a kicker cavity having a bandwidth >5MHz***, bunch-phase monitor (BPhM) and RF-FBs. In this presentation, we describe our overall bunch lengthening system including cavity and BPhM designs. We also present particle tracking simulation results demonstrating that the bunch lengthening limitations can be alleviated by means of direct RF-FBs****.
* N. Yamamoto et al., PRAB 21, 012001, 2018.
** T. Yamaguchi et al., accepted in NIM A.
*** D. Naito et al, IPAC2021, MOPSB331, 2021.
**** N. Yamamoto et al., IPAC23, WEPL161, 2023.

Slides MO3B3 [2.655 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO3B3

About •

Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023

Cite •

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

TU3B3

Pyapas: A New Framework for High Level Application Development at HEPS

framework, MMI, linac, booster

77

X.H. Lu
IHEP CSNS, Guangdong Province, People’s Republic of China
D. Ji, H.F. Ji, Y. Jiao, J.Y. Li, N. Li, C. Meng, Y.M. Peng, J. Wan, Y. Wei, G. Xu, H.S. Xu, Y.L. Zhao
IHEP, Beijing, People’s Republic of China

The development of high-level application (HLA) is an indispensable part of the light source construction process. With the increase in the scale and complexity of accelerators, the development of HLA will also face many new challenges, such as increased data volume, multiple data types, more parameter channels, and more complex tuning algorithms. So a new framework named Pyapas has been designed for HLA development which aims to provide a high-performance, scalable, flexible, and reliable HLA development framework to meet the needs of large-scale parameter tuning and data processing. Pyapas is designed with a modular concept, decomposing the development needs of HLA into different modules for decoupled development, and calling them through simple interfaces. In the communication module, a singleton factory class is designed to avoid duplicate creation of channel connections, and combined with Qt’s signal-slot mechanism to create non-blocking communication connections, greatly improving the carrying capacity of parameter scale. While a deeply decoupled two-layer physical model module is designed to quickly switch different mathematical models to meet different online computing needs. Moreover, the design of the C/S architecture development module and the rapid creation and management module of the database is helpful for quickly developing complex programs, further enhancing the applicability of Pyapas. This paper will introduce the main feature of Pyapas

Slides TU3B3 [6.913 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU3B3

About •

Received ※ 30 August 2023 — Revised ※ 31 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023

Cite •

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

WE4P37

Laser Interferometer for Hall Probe Alignment and Measurement of Undulator

laser, undulator, alignment, software

215

S.M. Khan, G. Mishra
Devi Ahilya University, Indore, India
M. Gehlot
DESY, Hamburg, Germany
S. Mishra
Devi Ahilya Vishwa Vidyalaya, Institute of Engineering & Technology, Indore, India

In the Hall probe Magnetic measurement method the field mapping is done along the length of the undulator. The field integral and phase error computed from the field mapping works as the figure of merit of the undulator. In this paper, we discuss the working of a laser interferometer for precise Hall probe alignment. A new user friendly software based on MATLAB has been developed. The phase error and magnetic field integrals are calculated for both taper and untaper U50 undulator of the Laser and Insertion Device Application (LIDA) Laboratory.

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P37

About •

Received ※ 22 August 2023 — Revised ※ 22 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023

Cite •

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

TH1D2

A Bulk Superconductor and its Application to Insertion Devices

undulator, solenoid, permanent-magnet, experiment

224

T. Kii
Kyoto University, Kyoto, Japan

Funding: This work was supported by KAKENHI JP17H01127 and JP22H03870
High-field short-period undulator will be one of the key technologies for the future light sources. Various approaches have been continued under the limitation of materials for permanent/superconducting magnets. A use of bulk superconductor is attractive for its high current density under existence of high magnetic field. The critical current density for rare-earth barium copper oxide (REBCO) bulk superconductor exceeds 10 kA/mm2 even at 10 K in a field range below about 3 T and exceeds 20 kA/mm2 at 4.2 K. In order to utilize the quite high current density in the bulk REBCO and to generate periodic magnetic field we proposed bulk superconductor staggered array undulator in 2006*. Recently we have developed the third undulaor prototype which consists of 6T solenoid and 6 period of bulk REBCO array, and successfully demonstrated periodic field amplitude of 2.22 T for period length of 10 mm and undulator gap of 4.0 mm at 7 K. In the presentation, we will summarize properties and performances of bulk REBCO superconductors and discuss on the performance of bulk superconductor staggered array undulator and potential as an insertion device for the future light sources.
* T. Kii et al.: Proc. FEL2006 (2006) p. 653.

Slides TH1D2 [2.682 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH1D2

About •

Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023

Cite •

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

TH3D3

How Can Machine Learning Help Future Light Sources?

operation, electron, laser, feedback

249

A. Santamaria Garcia, E. Bründermann, M. Caselle, A.-S. Müller, L. Scomparin, C. Xu
KIT, Karlsruhe, Germany
G. De Carne
Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

Machine learning (ML) is one of the key technologies that can considerably extend and advance the capabilities of particle accelerators and needs to be included in their future design. Future light sources aim to reach unprecedented beam brightness and radiation coherence, which require challenging beam sizes and accelerating gradients. The sensitive designs and complex operation modes that arise from such demands will impact the beam availability and flexibility for the users, and can render future accelerators inefficient. ML brings a paradigm shift that can re-define how accelerators are operated. In this contribution we introduce the vision of ML-driven facilities for future accelerators, address some challenges of future light sources, and show an example of how such methods can be used to control beam instabilities.

Slides TH3D3 [5.398 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH3D3

About •

Received ※ 23 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023

Cite •

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