PCaPAC2018 - List of Keywords (feedback)

Paper	Title	Other Keywords	Page
WEP03	A General Solution for Complex Vacuum System Controls	vacuum, status, GUI, operation	30
	G. Bischof, A. M. Barbour, B. A. Sobhani, A. Walter BNL, Upton, Long Island, New York, USA
	At the National Synchrotron Light Source II (NSLS-II) there are many different ultra-high vacuum system configurations on the unique beamline end-stations. The proposed controls solution attempts to capture the requirements of all of these configurations with a single standard logic and graphical user interface. Additional design considerations include: resource management for multiple users, providing a high level of abstraction to simplify operation for users, providing a high level of flexibility to do non-standard operations, minimizing shock from pressure differentials when opening valves, supporting a variety of pumps, and maximizing pump lifetime. At NSLS-II it was determined that all vacuum configurations can be captured by the composition of three standard objects: a "rough vacuum group", and "high vacuum group", and a "smart vacuum manifold" which implements a blocking queue. These objects can be flexibly linked together to meet the needs of the beamline experiments. This solution is platform independent, but implemented and tested here using Pfeiffer vacuum pumps, Allen Bradley PLC, EPICS, and Control System Studio (CSS).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEP03
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)

THCA3	A Feedback/Feedforward System at the TPS and its Component Performance	power-supply, radio-frequency, controls, photon	127
	C.H. Huang, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.Y. Wu NSRRC, Hsinchu, Taiwan
	For a low-emittance photon light source like the Taiwan Photon Source (TPS), beam stability is a very important property for high-quality photon beams. It is, however, hard to completely remove beam disturbing effects. Therefore, a feedback/feedforward system becomes an effective tool to suppress beam motion. In this report, we discuss the performance of such a system implemented at the TPS. The component performance of the feedback system has been tested to understand its bandwidth limitations.
	Slides THCA3 [2.164 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THCA3
About •	paper received ※ 03 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)

THP07	Long-term Stability Observed by Electron BPM and Photon BPM for Taiwan Photon Source	electron, photon, electronics, synchrotron	176
	P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang NSRRC, Hsinchu, Taiwan
	TPS is 3-GeV synchrotron light source which have opened for public users since September 2016 and now offers 400 mA top-up mode operation. The requirements of the long term orbit stability and orbit reproducibility after beam trip have been gradually more and more stringent and become a challenge from users’ request. Furthermore, the thermal effect would be expected to be worsen after 500 mA top-up operation which should deteriorate the orbit drift. The report investigates the long-term orbit stability observed from eBPM and XBPM and also evaluates the possibility of the local XBPM feedback.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP07
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)

FRCC4	Maintenance and Optimization of Insertion Devices at NSLS-II Using Motion Controls	controls, software, insertion, undulator	253
	C.A. Guerrero, J. Escallier, R.I. Farnsworth, D.A. Hidas, Y. Tian BNL, Upton, Long Island, New York, USA
	Funding: This project is funded by Brookhaven Science Associates. BSA is a partnership between Battelle and The Research Foundation for the State University of New York on behalf of Stony Brook University. The purpose of this project is to demonstrate the performance improvements on insertion devices by upgrading the motion control software. The insertion devices installed inside the NSLS-II storage ring are currently operating at micron precision with slow speeds, which can limit the scope of preferences for user experimentation. We can manipulate the devices with adaptive tuning algorithms to compensate for varying electromagnetic forces throughout motion scans. By correcting positional feedback with encoder compensation and redefining motion programs, we can safely increase the speed to run the same motion trajectories in less time.
	Slides FRCC4 [3.876 MB]
	Poster FRCC4 [4.979 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-FRCC4
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)

Paper

Title

Other Keywords

Page

WEP03

A General Solution for Complex Vacuum System Controls

vacuum, status, GUI, operation

30

G. Bischof, A. M. Barbour, B. A. Sobhani, A. Walter
BNL, Upton, Long Island, New York, USA

At the National Synchrotron Light Source II (NSLS-II) there are many different ultra-high vacuum system configurations on the unique beamline end-stations. The proposed controls solution attempts to capture the requirements of all of these configurations with a single standard logic and graphical user interface. Additional design considerations include: resource management for multiple users, providing a high level of abstraction to simplify operation for users, providing a high level of flexibility to do non-standard operations, minimizing shock from pressure differentials when opening valves, supporting a variety of pumps, and maximizing pump lifetime. At NSLS-II it was determined that all vacuum configurations can be captured by the composition of three standard objects: a "rough vacuum group", and "high vacuum group", and a "smart vacuum manifold" which implements a blocking queue. These objects can be flexibly linked together to meet the needs of the beamline experiments. This solution is platform independent, but implemented and tested here using Pfeiffer vacuum pumps, Allen Bradley PLC, EPICS, and Control System Studio (CSS).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-WEP03

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)

THCA3

A Feedback/Feedforward System at the TPS and its Component Performance

power-supply, radio-frequency, controls, photon

127

C.H. Huang, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.Y. Wu
NSRRC, Hsinchu, Taiwan

For a low-emittance photon light source like the Taiwan Photon Source (TPS), beam stability is a very important property for high-quality photon beams. It is, however, hard to completely remove beam disturbing effects. Therefore, a feedback/feedforward system becomes an effective tool to suppress beam motion. In this report, we discuss the performance of such a system implemented at the TPS. The component performance of the feedback system has been tested to understand its bandwidth limitations.

Slides THCA3 [2.164 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THCA3

About •

paper received ※ 03 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)

THP07

Long-term Stability Observed by Electron BPM and Photon BPM for Taiwan Photon Source

electron, photon, electronics, synchrotron

176

P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang
NSRRC, Hsinchu, Taiwan

TPS is 3-GeV synchrotron light source which have opened for public users since September 2016 and now offers 400 mA top-up mode operation. The requirements of the long term orbit stability and orbit reproducibility after beam trip have been gradually more and more stringent and become a challenge from users’ request. Furthermore, the thermal effect would be expected to be worsen after 500 mA top-up operation which should deteriorate the orbit drift. The report investigates the long-term orbit stability observed from eBPM and XBPM and also evaluates the possibility of the local XBPM feedback.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-THP07

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)

FRCC4

Maintenance and Optimization of Insertion Devices at NSLS-II Using Motion Controls

controls, software, insertion, undulator

253

C.A. Guerrero, J. Escallier, R.I. Farnsworth, D.A. Hidas, Y. Tian
BNL, Upton, Long Island, New York, USA

Funding: This project is funded by Brookhaven Science Associates. BSA is a partnership between Battelle and The Research Foundation for the State University of New York on behalf of Stony Brook University.
The purpose of this project is to demonstrate the performance improvements on insertion devices by upgrading the motion control software. The insertion devices installed inside the NSLS-II storage ring are currently operating at micron precision with slow speeds, which can limit the scope of preferences for user experimentation. We can manipulate the devices with adaptive tuning algorithms to compensate for varying electromagnetic forces throughout motion scans. By correcting positional feedback with encoder compensation and redefining motion programs, we can safely increase the speed to run the same motion trajectories in less time.

Slides FRCC4 [3.876 MB]

Poster FRCC4 [4.979 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2018-FRCC4

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)