FLS2023 - List of Authors (Xu, H.S.)

Paper	Title	Page
TU3B3	Pyapas: A New Framework for High Level Application Development at HEPS	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)

TU4P27	Progress of the HEPS Accelerator Construction and Linac Commissioning	131
	C. Meng, J.S. Cao, Z. Duan, D.Y. He, P. He, H.F. Ji, Y. Jiao, W. Kang, J. Li, J.Y. Li, W.M. Pan, Y.M. Peng, H. Qu, S.K. Tian, G. Xu, H.S. Xu, J. Zhang, J.R. Zhang IHEP, Beijing, People’s Republic of China X.H. Lu IHEP CSNS, Guangdong Province, People’s Republic of China
	The High Energy Photon Source (HEPS) is the first fourth-generation synchrotron radiation source in China that has been on the track for construction. The accelerator complex of the light source is composed of a 7BA storage ring, a booster injector, a Linac pre-injector, and three transfer lines. In order to provide high-bunch-charge beams for the storage ring, the booster was designed to be capable of both beam acceleration from low injection energy to extraction energy and charge accumulation at the extraction energy by means of accepting electron bunches from the storage ring. The Linac was built using S-band normal conducting structures, and can provide electron beam with pulse charge up to 7 nC. This paper reports the progress of the construction of the accelerators, including the installation of the storage ring, the pre-commissioning tests of the booster, and commissioning of the Linac. In particular, the beam commissioning of the Linac will be introduced in detail.
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P27
About •	Received ※ 29 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3B4	Generation of Multi X-Ray Pulses with Tunable Separation in Electron Storage Rings
	H.S. Xu, N. Wang, J.Y. Xu IHEP, Beijing, People’s Republic of China
	Synchrotron light sources, which can provide high brightness X-ray pulses to different users simultaneously, are demonstrated as a kind of very powerful tool for scientific research in many areas. Among the possible applications of synchrotron light sources, time resolved experiments are interesting for many users and usually require special operation modes. However, the time structures of X-ray pulses generated by a synchrotron light source are usually limited to integer times of the RF period, which is typically several nanoseconds (e.g., 2 ns RF period time corresponding to 500 MHz RF frequency). Here, we propose a novel scheme to take advantage of transverse deflecting cavities and over-stretching conditions of the higher harmonic cavities to ensure the transverse and longitudinal tunability of the twoμbunches in the same RF bucket. By applying this scheme, two X-ray pulses with tunable transverse displacement (mm level) and time delay (hundreds of ps level) can be provided to the scientific users for their X-ray pump X-ray probe experiments or X-ray probe X-ray probe experiments. The key setting parameters to generate the two X-ray pulses are given here. The classical "single-bunch" instabilities under the over-stretching conditions were also studied and presented.
	Slides TH3B4 [4.975 MB]
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Paper

Title

Page

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

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)

TU4P27

Progress of the HEPS Accelerator Construction and Linac Commissioning

131

C. Meng, J.S. Cao, Z. Duan, D.Y. He, P. He, H.F. Ji, Y. Jiao, W. Kang, J. Li, J.Y. Li, W.M. Pan, Y.M. Peng, H. Qu, S.K. Tian, G. Xu, H.S. Xu, J. Zhang, J.R. Zhang
IHEP, Beijing, People’s Republic of China
X.H. Lu
IHEP CSNS, Guangdong Province, People’s Republic of China

The High Energy Photon Source (HEPS) is the first fourth-generation synchrotron radiation source in China that has been on the track for construction. The accelerator complex of the light source is composed of a 7BA storage ring, a booster injector, a Linac pre-injector, and three transfer lines. In order to provide high-bunch-charge beams for the storage ring, the booster was designed to be capable of both beam acceleration from low injection energy to extraction energy and charge accumulation at the extraction energy by means of accepting electron bunches from the storage ring. The Linac was built using S-band normal conducting structures, and can provide electron beam with pulse charge up to 7 nC. This paper reports the progress of the construction of the accelerators, including the installation of the storage ring, the pre-commissioning tests of the booster, and commissioning of the Linac. In particular, the beam commissioning of the Linac will be introduced in detail.

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P27

About •

Received ※ 29 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023

Cite •

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

TH3B4

Generation of Multi X-Ray Pulses with Tunable Separation in Electron Storage Rings

H.S. Xu, N. Wang, J.Y. Xu
IHEP, Beijing, People’s Republic of China

Synchrotron light sources, which can provide high brightness X-ray pulses to different users simultaneously, are demonstrated as a kind of very powerful tool for scientific research in many areas. Among the possible applications of synchrotron light sources, time resolved experiments are interesting for many users and usually require special operation modes. However, the time structures of X-ray pulses generated by a synchrotron light source are usually limited to integer times of the RF period, which is typically several nanoseconds (e.g., 2 ns RF period time corresponding to 500 MHz RF frequency). Here, we propose a novel scheme to take advantage of transverse deflecting cavities and over-stretching conditions of the higher harmonic cavities to ensure the transverse and longitudinal tunability of the twoμbunches in the same RF bucket. By applying this scheme, two X-ray pulses with tunable transverse displacement (mm level) and time delay (hundreds of ps level) can be provided to the scientific users for their X-ray pump X-ray probe experiments or X-ray probe X-ray probe experiments. The key setting parameters to generate the two X-ray pulses are given here. The classical "single-bunch" instabilities under the over-stretching conditions were also studied and presented.

Slides TH3B4 [4.975 MB]

Cite •

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