PCaPAC2018 - List of Keywords (timing)

Paper	Title	Other Keywords	Page
WEC2	Status of the TPS Control System	controls, EPICS, interface, power-supply	6
	Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Huang, C.H. Kuo, D. Lee, C.Y. Liao, C.-J. Wang, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Control system for the Taiwan Photon Source (TPS) has been delivered in mid-2014 to support commissioning and routine operation of the accelerator system. The TPS control system adopts EPICS toolkits as its frameworks. Various subsystems interface to the control system according its specific requirements. Operation experiences accumulated during last four years confirmed the system working well. Minor revisions were made to improve the system performance. Current status of the control system and ongoing developments will be summarized in the report.
	Slides WEC2 [11.061 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEC2
About •	paper received ※ 10 October 2018 paper accepted ※ 17 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP21	Injection Control of the TPS	injection, controls, booster, storage-ring	80
	J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Injection control application served for Taiwan Photon Source (TPS) to help commissioning and operation of the machine. Top-up injection functionality is available from machine commissioning stage to accelerate vacuum conditioning. During last two years, several updates have been done to enhance flexibility for the injection control. The injection control includes foreground and background processes to coordinate the operation of e-gun, linear accelerator, booster synchrotron, storage ring by the help of event based timing system. Lifetime calculation of the storage ring is also synchronized with the injection process. Detail of the implementation will be presented in this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEP21
About •	paper received ※ 10 October 2018 paper accepted ※ 16 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THCA4	Development of a Network-based Timing and Tag Information Distribution System for Synchrotron Radiation Experiments at SPring-8	FPGA, network, software, experiment	131
	T. Masuda JASRI/SPring-8, Hyogo, Japan
	Time-resolved measurements in synchrotron radiation experiments require an RF clock of a storage ring accelerator and a fundamental revolution frequency (zero address) signal. For the usage of these signals around the experimental station, long RF cables from the accelerator timing station, divider modules and delay modules must be deployed. These installations need a lot of cost and require a lot of efforts to adjust the timing by experts. To lower these costs and efforts, the revolution frequency, which is ~209 kHz at the SPring-8 storage ring, and tag information distribution system has been studied based on a high precision time synchronization technology over a network. In this study, the White Rabbit* (WR) technology is adopted. The proof of concept system has been built, which consists of a master PC, a slave PC and two WR switches. The master PC detects the zero-address signal and distributes the time stamps with tag information to the slave PC. Then the slave PC generates the ~209 kHz signals synchronized with the target bunch by adding the offset time by software. The measured one-σ jitter of the output signals from the slave PC has been achieved less than 100 ps. * https://www.ohwr.org/projects/white-rabbit
	Slides THCA4 [3.309 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THCA4
About •	paper received ※ 09 October 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP12	Upgrading the Synchronisation and Trigger Systems on the Vulcan High-Power Nd:glass Laser	laser, fibre-optics, experiment, operation	187
	D.A. Pepler, I. O. Musgrave, P.B.M. Oliveira STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The Vulcan Neodymium-Glass High-Power Laser Facility at the Central Laser Facility in the UK has been operational for over 40 years providing a world-leading and high-profile service to International researchers in the field of Plasma Physics. Over that time the Facility has had many modifications and enhancements to the buildings, the laser hardware and to the computerised control, synchronisation and timing systems. As the laser systems have developed and the user experiments have continued to become much more complex and demanding, many new operational conditions have been required. The use of four independent laser oscillators with different properties - including temporal, spectral and operating frequencies - have meant that the optical and electrical multiplexing and the timing and synchronisation systems have all had to be adapted and extended to cope with these additional needs. However, these changes have resulted in the build-up of the overall system jitter to ± 250 ps between long (ns) and short (ps) optical pulses and this is a limiting factor for time-critical experiments. This paper will present some of the key changes and improvements that have recently been made.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP12
About •	paper received ※ 27 September 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP17	Injection and Extraction Timing Controls at SuperKEKB Damping Ring	controls, extraction, operation, damping	201
	H. Sugimura, H. Kaji, F. Miyahara, S. Sasaki, M. Satoh KEK, Ibaraki, Japan Y. Iitsuka EJIT, Hitachi, Ibaraki, Japan T. Kudou, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	SuperKEKB project aims at world highest luminosity to 8x10³⁵cm^-2s^-1. To achieve the luminosity, a lot of equipment was newly constructed or upgraded. Especially, Damping Ring (DR) was newly constructed for reducing positron emittance, and was located at the middle of the injector LINAC. The DR timing system was also constructed. The synchronized timing which is generated at injector LINAC, is received at DR sub timing station and is distributed the end of some equipment, Kicker, Septum, and monitoring devices. We succeeded to generate not only synchronized timing but also beam control information such as beam gate for trigger inhibit signal and injection and extraction timing "value" via data buffer delivery. By using this method, accelerator operation became more convenient system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP17
About •	paper received ※ 09 October 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP19	Timing System for Multiple Accelerator Rings at KEK e⁺/e⁻ Injector LINAC	linac, injection, gun, laser	207
	F. Miyahara, K. Furukawa, H. Kaji, M. Satoh, H. Sugimura KEK, Ibaraki, Japan T. Kudo, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan H.S. Saotome Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
	The KEK e⁺/e⁻ injector linac is operated in multiple modes that can be switched every 20 ms for e⁺/e⁻ beam injection to five different accelerator rings, SuperKEKB High Energy Ring (HER), Photon Factory (PF) ring, PF-AR, positron damping ring (DR) and SuperKEKB Low Energy Ring (LER). The MRF event system which consists of event generators (EVG) and event receivers (EVR) is used to distribute event codes that correspond to beam modes and data buffer. The EVR generates various trigger timing signals depending on the event code. The data buffer incudes some important parameters such as HER/PDR injection RF bucket, setting currents of pulsed quad/steering magnets that enables multiple beam injection. The event system uses the linac main clock (114.2 MHz) which synchronized to HER/LER, but due to PF and PF-AR rings are not synchronized to the linac, an additional synchronization system is employed for those rings. We will describe the timing and synchronization system to fulfill multiple injections to independent rings and report status of the system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP19
About •	paper received ※ 17 October 2018 paper accepted ※ 17 October 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP21	Development of Triggered Scaler to Detect Miss-Trigger	operation, EPICS, FPGA, controls	213
	N. Kamikubota KEK, Ibaraki, Japan K.C. Sato J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Tajima KIS, Ibaraki, Japan S.Y. Yoshida Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
	A "triggered scaler" has been developed for J-PARC accelerators. It is a PLC-type scaler with memory-buffers. Number of pulsed signals is counted and stored in a cell of memory-buffer, then, each external trigger (25 Hz) shifts the pointer to the cell. The buffer size (192) is designed to store one machine-cycle (2480 ms or 5200 ms in J-PARC). Demonstrative measurements using a prototype module are reported. In addition, scheme to detect miss-trigger events are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP21
About •	paper received ※ 21 October 2018 paper accepted ※ 08 November 2018 issue date ※ 21 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEC2

Status of the TPS Control System

controls, EPICS, interface, power-supply

6

Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Huang, C.H. Kuo, D. Lee, C.Y. Liao, C.-J. Wang, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Control system for the Taiwan Photon Source (TPS) has been delivered in mid-2014 to support commissioning and routine operation of the accelerator system. The TPS control system adopts EPICS toolkits as its frameworks. Various subsystems interface to the control system according its specific requirements. Operation experiences accumulated during last four years confirmed the system working well. Minor revisions were made to improve the system performance. Current status of the control system and ongoing developments will be summarized in the report.

Slides WEC2 [11.061 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEC2

About •

paper received ※ 10 October 2018 paper accepted ※ 17 October 2018 issue date ※ 21 January 2019

Export •

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

WEP21

Injection Control of the TPS

injection, controls, booster, storage-ring

80

J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Injection control application served for Taiwan Photon Source (TPS) to help commissioning and operation of the machine. Top-up injection functionality is available from machine commissioning stage to accelerate vacuum conditioning. During last two years, several updates have been done to enhance flexibility for the injection control. The injection control includes foreground and background processes to coordinate the operation of e-gun, linear accelerator, booster synchrotron, storage ring by the help of event based timing system. Lifetime calculation of the storage ring is also synchronized with the injection process. Detail of the implementation will be presented in this report.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEP21

About •

paper received ※ 10 October 2018 paper accepted ※ 16 October 2018 issue date ※ 21 January 2019

Export •

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

THCA4

Development of a Network-based Timing and Tag Information Distribution System for Synchrotron Radiation Experiments at SPring-8

FPGA, network, software, experiment

131

T. Masuda
JASRI/SPring-8, Hyogo, Japan

Time-resolved measurements in synchrotron radiation experiments require an RF clock of a storage ring accelerator and a fundamental revolution frequency (zero address) signal. For the usage of these signals around the experimental station, long RF cables from the accelerator timing station, divider modules and delay modules must be deployed. These installations need a lot of cost and require a lot of efforts to adjust the timing by experts. To lower these costs and efforts, the revolution frequency, which is ~209 kHz at the SPring-8 storage ring, and tag information distribution system has been studied based on a high precision time synchronization technology over a network. In this study, the White Rabbit* (WR) technology is adopted. The proof of concept system has been built, which consists of a master PC, a slave PC and two WR switches. The master PC detects the zero-address signal and distributes the time stamps with tag information to the slave PC. Then the slave PC generates the ~209 kHz signals synchronized with the target bunch by adding the offset time by software. The measured one-σ jitter of the output signals from the slave PC has been achieved less than 100 ps.
* https://www.ohwr.org/projects/white-rabbit

Slides THCA4 [3.309 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THCA4

About •

paper received ※ 09 October 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019

Export •

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

THP12

Upgrading the Synchronisation and Trigger Systems on the Vulcan High-Power Nd:glass Laser

laser, fibre-optics, experiment, operation

187

D.A. Pepler, I. O. Musgrave, P.B.M. Oliveira
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The Vulcan Neodymium-Glass High-Power Laser Facility at the Central Laser Facility in the UK has been operational for over 40 years providing a world-leading and high-profile service to International researchers in the field of Plasma Physics. Over that time the Facility has had many modifications and enhancements to the buildings, the laser hardware and to the computerised control, synchronisation and timing systems. As the laser systems have developed and the user experiments have continued to become much more complex and demanding, many new operational conditions have been required. The use of four independent laser oscillators with different properties - including temporal, spectral and operating frequencies - have meant that the optical and electrical multiplexing and the timing and synchronisation systems have all had to be adapted and extended to cope with these additional needs. However, these changes have resulted in the build-up of the overall system jitter to ± 250 ps between long (ns) and short (ps) optical pulses and this is a limiting factor for time-critical experiments. This paper will present some of the key changes and improvements that have recently been made.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP12

About •

paper received ※ 27 September 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019

Export •

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

THP17

Injection and Extraction Timing Controls at SuperKEKB Damping Ring

controls, extraction, operation, damping

201

H. Sugimura, H. Kaji, F. Miyahara, S. Sasaki, M. Satoh
KEK, Ibaraki, Japan
Y. Iitsuka
EJIT, Hitachi, Ibaraki, Japan
T. Kudou, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

SuperKEKB project aims at world highest luminosity to 8x10³⁵cm^-2s^-1. To achieve the luminosity, a lot of equipment was newly constructed or upgraded. Especially, Damping Ring (DR) was newly constructed for reducing positron emittance, and was located at the middle of the injector LINAC. The DR timing system was also constructed. The synchronized timing which is generated at injector LINAC, is received at DR sub timing station and is distributed the end of some equipment, Kicker, Septum, and monitoring devices. We succeeded to generate not only synchronized timing but also beam control information such as beam gate for trigger inhibit signal and injection and extraction timing "value" via data buffer delivery. By using this method, accelerator operation became more convenient system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP17

About •

paper received ※ 09 October 2018 paper accepted ※ 15 October 2018 issue date ※ 21 January 2019

Export •

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

THP19

Timing System for Multiple Accelerator Rings at KEK e⁺/e⁻ Injector LINAC

linac, injection, gun, laser

207

F. Miyahara, K. Furukawa, H. Kaji, M. Satoh, H. Sugimura
KEK, Ibaraki, Japan
T. Kudo, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
H.S. Saotome
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan

The KEK e⁺/e⁻ injector linac is operated in multiple modes that can be switched every 20 ms for e⁺/e⁻ beam injection to five different accelerator rings, SuperKEKB High Energy Ring (HER), Photon Factory (PF) ring, PF-AR, positron damping ring (DR) and SuperKEKB Low Energy Ring (LER). The MRF event system which consists of event generators (EVG) and event receivers (EVR) is used to distribute event codes that correspond to beam modes and data buffer. The EVR generates various trigger timing signals depending on the event code. The data buffer incudes some important parameters such as HER/PDR injection RF bucket, setting currents of pulsed quad/steering magnets that enables multiple beam injection. The event system uses the linac main clock (114.2 MHz) which synchronized to HER/LER, but due to PF and PF-AR rings are not synchronized to the linac, an additional synchronization system is employed for those rings. We will describe the timing and synchronization system to fulfill multiple injections to independent rings and report status of the system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP19

About •

paper received ※ 17 October 2018 paper accepted ※ 17 October 2018 issue date ※ 21 January 2019

Export •

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

THP21

Development of Triggered Scaler to Detect Miss-Trigger

operation, EPICS, FPGA, controls

213

N. Kamikubota
KEK, Ibaraki, Japan
K.C. Sato
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
Y. Tajima
KIS, Ibaraki, Japan
S.Y. Yoshida
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan

A "triggered scaler" has been developed for J-PARC accelerators. It is a PLC-type scaler with memory-buffers. Number of pulsed signals is counted and stored in a cell of memory-buffer, then, each external trigger (25 Hz) shifts the pointer to the cell. The buffer size (192) is designed to store one machine-cycle (2480 ms or 5200 ms in J-PARC). Demonstrative measurements using a prototype module are reported. In addition, scheme to detect miss-trigger events are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP21

About •

paper received ※ 21 October 2018 paper accepted ※ 08 November 2018 issue date ※ 21 January 2019

Export •

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