PCaPAC2016 - List of Keywords (feedback)

Paper	Title	Other Keywords	Page
WEPOPRPO18	Automated Availability Statistics	ion, operation, linac, controls	38
	P. Duval, H. Ehrlichmann, M. Lomperski DESY, Hamburg, Germany J. Bobnar Cosylab, Ljubljana, Slovenia
	The availability of any large machine with users is not only of paramount importance but is also an oft quoted number, taken to represent the overall health of the facility, reflecting on the maintenance, operation, and engineering of the machine. The officially quoted availability is typically generated by hand after perusing the operation statistics over the time period in question. When humans are involved in such calculations there might be a subtle tendency to avoid the stigma of low availability or otherwise inflate performance. This could lead to skepticism at 'impossibly high' availability, as well as render the comparison of availability from one machine with another moot. We present here a method for calculating the machine availability automatically, based on the known machine states and the known alarm states of the machine. Although sufficient, in order to be accurate and useful, the method requires a perfect representation of all possible machine states and of all possible fatal alarms. As achieving perfection is an ongoing affair, the ability for a human to 'post-correct' the automated statistics is also described.
	Poster WEPOPRPO18 [1.229 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-WEPOPRPO18
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOPRPO23	Fast Orbit Feedback at DELTA	ion, electron, network, controls	123
	P. Hartmann, A. Althaus, S. Khan, D. Rohde, D. Schirmer, G. Schünemann, P. Towalski, T. Weis DELTA, Dortmund, Germany
	Funding: Work supported by BMBF, FKZ 05P09PERB5 and \newline Forschungszentrum J\"ulich, contract no. COSY/FAIR-114 At the electron storage ring DELTA, studies of a fast orbit feedback integrating Libera Electron and Bergoz MX-BPM electronics were conducted. An review of the project and its results is given.
	Poster THPOPRPO23 [32.402 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-THPOPRPO23
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRFMPLCO01	Status of the NSLS-II LLRF System	ion, cavity, FPGA, controls	129
	C. Marques, F. Gao, B. Holub, J. Rose, N.A. Towne, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: NSLS-II, a U.S. Department of Energy Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. The NSLS-II RF system uses an in-house FPGA based low level RF (LLRF) solution called the Cavity Field Controller (CFC). The CFC directs the amplitude and phase for the high power RF and directly influences beam acceleration and stability. In this paper we discuss a logically embedded Network Analyzer (NA) in situ with the digital feedback loop controlled via a MATLAB or EPICS interface. The embedded NA was used to evaluate the RF feedback stability and influence of the feedback parameters on the beam. We will also discuss diagnostics tools to investigate longitudinal beam dynamics and other functionality embedded into the FPGA fabric. Future development of the CFC implementation and hardware upgrades will also be discussed.
	Slides FRFMPLCO01 [2.270 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRFMPLIO03	Overview of Some Feedback & Control Systems at Synchrotron Soleil	ion, controls, synchrotron, cavity	132
	C. Engblom, Y.-M. Abiven, F. Blache, D.C. Corruble, A. Dawiec, M. Diop, N. Hubert, N. Jobert, S.K. Kubsky, F. Langlois, P. Marchand, G. Renaud SOLEIL, Gif-sur-Yvette, France T. Stankevic MAX IV Laboratory, Lund University, Lund, Sweden
	This paper gives an overview of some feedback & control systems in Synchrotron SOLEIL that are in use or in development today. Electron Beam stability is something that is being addressed in several SOLEIL applications; Fast Orbit Feedback is a multi-input multi-output control system made to stabilize beam position perturbations with slow and fast corrections. In addition, active RF cavities are used to maintain stable beam energy & spread as well as keeping electron density even throughout the storage ring. Beam stability also comes from feedforward non-linear control in particle trajectory compensation on both sides of electromagnetic undulators. On beamlines, multi-actuator piezos or pneumatics are used to regulate photon flux to keep within detector operating range; a method to maximize the photon flux while keeping detector below damage thresholds. Currently in development at the sample stage level, the Nanoprobe Project (collaboration MAXIV & Soleil) focuses on sample stabilization during step- & fly- scans which is realized through multi-axis nano-positioning with high- & low- frequency closed-loop control implementing interferometer feedback &/or compensation tables.
	Slides FRFMPLIO03 [6.248 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLIO03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRFMPLCO05	A Fast, Custom FPGA-Based Signal Processor and Its Applications to Intra-Train Beam Stabilisation	ion, kicker, controls, FPGA	137
	G.B. Christian, N. Blaskovic Kraljevic, R.M. Bodenstein, T. Bromwich, P. Burrows, C. Perry, R.L. Ramjiawan, J. Roberts JAI, Oxford, United Kingdom P. Burrows, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom J. Roberts CERN, Geneva, Switzerland
	A custom 9-channel feedback controller has been developed for low-latency applications in beam-based stabilisation. Fast 14-bit ADCs and DACs are used for high-resolution signal conversion and a Xilinx Virtex-5 FPGA is used for core high-bandwidth digital computation. The sampling, and fast digital logic, can be clocked in the range 200 to 400 MHz, derived from an external or internal source. A custom data acquisition system, based around LabVIEW, has been developed for real-time control and monitoring at up to 460 kbps transfer rates, and is capable of writing and reading from EPICS data records. Details of the hardware, signal processing, and data acquisition will be presented. Two examples of applications will also be presented: a position and angle bunch-by-bunch feedback system using strip-line beam position monitors to stabilise intra-train positional jitter to below the micron level with a latency less than 154 ns; and a phase feedforward system using RF cavity-based phase monitors to stabilise the downstream rms phase jitter to below 50 fs with a total latency less than the 380 ns beam time-of-flight.
	Slides FRFMPLCO05 [2.925 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO05
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRFMPLCO06	Harmony: A Generic FPGA Based Solution for Flexible Feedback Systems	ion, FPGA, hardware, controls	141
	X. Serra-Gallifa, J.A. Avila-Abellan, M. Broseta, G. Cuní, D. Fernández-Carreiras, O. Matilla, A. Ruz ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Feedback and complex acquisition systems usually need real-time interaction among instruments with micro-second's time response. These implementations are hard to achieve with processors but feasible using FPGAs. There are some cases, such as synchrotron beamlines, where high flexibility and continuous tuning are also required, but the implementation of multiple full-custom FPGA designs are extremely time-consuming. Harmony is a solution based in FPGA that offers, via high level programming, a unique framework with common time base, data acquisition, storage, real-time processing, data sharing and diagnostic services designed to implement flexible feedback systems. It is based in two interconnect-ed buses: Self-Describing Bus, developed at CERN/GSI under OHWR license, that communicates with Control System; and Harmony Bus which creates a bus frame-work where different modules can share timestamped data capable of pre-programed events generation. The first version of Harmony is already successfully being used in Em# project which objective is the development of a performant four-channel electrometer.
	Slides FRFMPLCO06 [0.861 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO06
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEPOPRPO18

Automated Availability Statistics

ion, operation, linac, controls

38

P. Duval, H. Ehrlichmann, M. Lomperski
DESY, Hamburg, Germany
J. Bobnar
Cosylab, Ljubljana, Slovenia

The availability of any large machine with users is not only of paramount importance but is also an oft quoted number, taken to represent the overall health of the facility, reflecting on the maintenance, operation, and engineering of the machine. The officially quoted availability is typically generated by hand after perusing the operation statistics over the time period in question. When humans are involved in such calculations there might be a subtle tendency to avoid the stigma of low availability or otherwise inflate performance. This could lead to skepticism at 'impossibly high' availability, as well as render the comparison of availability from one machine with another moot. We present here a method for calculating the machine availability automatically, based on the known machine states and the known alarm states of the machine. Although sufficient, in order to be accurate and useful, the method requires a perfect representation of all possible machine states and of all possible fatal alarms. As achieving perfection is an ongoing affair, the ability for a human to 'post-correct' the automated statistics is also described.

Poster WEPOPRPO18 [1.229 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-WEPOPRPO18

Export •

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

THPOPRPO23

Fast Orbit Feedback at DELTA

ion, electron, network, controls

123

P. Hartmann, A. Althaus, S. Khan, D. Rohde, D. Schirmer, G. Schünemann, P. Towalski, T. Weis
DELTA, Dortmund, Germany

Funding: Work supported by BMBF, FKZ 05P09PERB5 and \newline Forschungszentrum J\"ulich, contract no. COSY/FAIR-114
At the electron storage ring DELTA, studies of a fast orbit feedback integrating Libera Electron and Bergoz MX-BPM electronics were conducted. An review of the project and its results is given.

Poster THPOPRPO23 [32.402 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-THPOPRPO23

Export •

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

FRFMPLCO01

Status of the NSLS-II LLRF System

ion, cavity, FPGA, controls

129

C. Marques, F. Gao, B. Holub, J. Rose, N.A. Towne, G.M. Wang
BNL, Upton, Long Island, New York, USA

Funding: NSLS-II, a U.S. Department of Energy Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704.
The NSLS-II RF system uses an in-house FPGA based low level RF (LLRF) solution called the Cavity Field Controller (CFC). The CFC directs the amplitude and phase for the high power RF and directly influences beam acceleration and stability. In this paper we discuss a logically embedded Network Analyzer (NA) in situ with the digital feedback loop controlled via a MATLAB or EPICS interface. The embedded NA was used to evaluate the RF feedback stability and influence of the feedback parameters on the beam. We will also discuss diagnostics tools to investigate longitudinal beam dynamics and other functionality embedded into the FPGA fabric. Future development of the CFC implementation and hardware upgrades will also be discussed.

Slides FRFMPLCO01 [2.270 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO01

Export •

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

FRFMPLIO03

Overview of Some Feedback & Control Systems at Synchrotron Soleil

ion, controls, synchrotron, cavity

132

C. Engblom, Y.-M. Abiven, F. Blache, D.C. Corruble, A. Dawiec, M. Diop, N. Hubert, N. Jobert, S.K. Kubsky, F. Langlois, P. Marchand, G. Renaud
SOLEIL, Gif-sur-Yvette, France
T. Stankevic
MAX IV Laboratory, Lund University, Lund, Sweden

This paper gives an overview of some feedback & control systems in Synchrotron SOLEIL that are in use or in development today. Electron Beam stability is something that is being addressed in several SOLEIL applications; Fast Orbit Feedback is a multi-input multi-output control system made to stabilize beam position perturbations with slow and fast corrections. In addition, active RF cavities are used to maintain stable beam energy & spread as well as keeping electron density even throughout the storage ring. Beam stability also comes from feedforward non-linear control in particle trajectory compensation on both sides of electromagnetic undulators. On beamlines, multi-actuator piezos or pneumatics are used to regulate photon flux to keep within detector operating range; a method to maximize the photon flux while keeping detector below damage thresholds. Currently in development at the sample stage level, the Nanoprobe Project (collaboration MAXIV & Soleil) focuses on sample stabilization during step- & fly- scans which is realized through multi-axis nano-positioning with high- & low- frequency closed-loop control implementing interferometer feedback &/or compensation tables.

Slides FRFMPLIO03 [6.248 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLIO03

Export •

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

FRFMPLCO05

A Fast, Custom FPGA-Based Signal Processor and Its Applications to Intra-Train Beam Stabilisation

ion, kicker, controls, FPGA

137

G.B. Christian, N. Blaskovic Kraljevic, R.M. Bodenstein, T. Bromwich, P. Burrows, C. Perry, R.L. Ramjiawan, J. Roberts
JAI, Oxford, United Kingdom
P. Burrows, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
J. Roberts
CERN, Geneva, Switzerland

A custom 9-channel feedback controller has been developed for low-latency applications in beam-based stabilisation. Fast 14-bit ADCs and DACs are used for high-resolution signal conversion and a Xilinx Virtex-5 FPGA is used for core high-bandwidth digital computation. The sampling, and fast digital logic, can be clocked in the range 200 to 400 MHz, derived from an external or internal source. A custom data acquisition system, based around LabVIEW, has been developed for real-time control and monitoring at up to 460 kbps transfer rates, and is capable of writing and reading from EPICS data records. Details of the hardware, signal processing, and data acquisition will be presented. Two examples of applications will also be presented: a position and angle bunch-by-bunch feedback system using strip-line beam position monitors to stabilise intra-train positional jitter to below the micron level with a latency less than 154 ns; and a phase feedforward system using RF cavity-based phase monitors to stabilise the downstream rms phase jitter to below 50 fs with a total latency less than the 380 ns beam time-of-flight.

Slides FRFMPLCO05 [2.925 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO05

Export •

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

FRFMPLCO06

Harmony: A Generic FPGA Based Solution for Flexible Feedback Systems

ion, FPGA, hardware, controls

141

X. Serra-Gallifa, J.A. Avila-Abellan, M. Broseta, G. Cuní, D. Fernández-Carreiras, O. Matilla, A. Ruz
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Feedback and complex acquisition systems usually need real-time interaction among instruments with micro-second's time response. These implementations are hard to achieve with processors but feasible using FPGAs. There are some cases, such as synchrotron beamlines, where high flexibility and continuous tuning are also required, but the implementation of multiple full-custom FPGA designs are extremely time-consuming. Harmony is a solution based in FPGA that offers, via high level programming, a unique framework with common time base, data acquisition, storage, real-time processing, data sharing and diagnostic services designed to implement flexible feedback systems. It is based in two interconnect-ed buses: Self-Describing Bus, developed at CERN/GSI under OHWR license, that communicates with Control System; and Harmony Bus which creates a bus frame-work where different modules can share timestamped data capable of pre-programed events generation. The first version of Harmony is already successfully being used in Em# project which objective is the development of a performant four-channel electrometer.

Slides FRFMPLCO06 [0.861 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-PCaPAC2016-FRFMPLCO06

Export •

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