IPAC2021 - Classification: MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects / T05 Beam Feedback Systems

Paper	Title	Page
TUPAB263	The Phase Loop Status of the RF System in CSNS/RCS	2076
	L. Huang, X. Li, S. Wang IHEP, Beijing, People’s Republic of China M.T. Li, H.Y. Liu IHEP CSNS, Guangdong Province, People’s Republic of China Y. Liu DNSC, Dongguan, People’s Republic of China
	The Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) is a high intensity proton accelerator. The acceleration system consists of eight ferrite loaded cavities. The RCS is the space charge dominant machine and it is mitigated through the bunch factor optimization in the beam commissioning, so the injected beam will occupy a larger bucket size and unavoidable mismatch with the bucket, thus the dipole oscillation is excited. The phase loop scheme is designed to restrict the oscillation in the RF system, but the transmission efficiency is reduced by the phase loop and the bunch factor also increases, so the phase loop scheme is studied. To keep the phase loop but also maintain the transmission efficiency, we optimized the original phase loop scheme, but the beam loss still increases small when the loop on.
	Poster TUPAB263 [1.548 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB263
About •	paper received ※ 13 May 2021 paper accepted ※ 02 June 2021 issue date ※ 21 August 2021
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TUPAB299	Tuned Delay Unit for a Stochastic Cooling System at NICA Collider	2186
	S.V. Barabin, T. Kulevoy, D.A. Liakin, A.Y. Orlov ITEP, Moscow, Russia I.V. Gorelyshev, K.G. Osipov, V.V. Peshkov, A.O. Sidorin JINR/VBLHEP, Dubna, Moscow region, Russia
	Stochastic cooling is one of the crucial NICA (Nuclotron-based Ion Collider fAcility) subsystems. This system requires fine tuning of the response delay to the kicker, for both longitudinal and transverse stochastic cooling systems. The use of a digital delay line allows to add additional features such as a frequency dependent group velocity correction. To analyse the capabilities of the digital delay unit, a prototype of the device was created and tested. The article presents the characteristics of the prototype, its architecture and principle of operation, test results and estimations for the future developments.
	Poster TUPAB299 [0.493 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB299
About •	paper received ※ 17 May 2021 paper accepted ※ 10 June 2021 issue date ※ 16 August 2021
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TUPAB300	Ion Source Optimization Using Bi-Objective Genetic and Matrix-Profile Algorithm	2190
	W. Geithner, Z. Andelkovic, O. Geithner, F. Herfurth, V. Rapp GSI, Darmstadt, Germany A. Neméth Atato, Alzenau, Germany A. Van Benschoten MPF, Plymouth, Minnesota, USA F. Wilhelmstötter emarsys, Vienna, Austria
	Employing the local ECR ion source of the FAIR phase 0 ion storage ring CRYRING@ESR, we set up an IT-environment for on-line data processing and applications based on the data available from beam diagnostic instruments and input signals controlling the ion source. As a first proof of principle, we implemented a closed-loop optimization software controller based on bi-objective Genetic Optimization. As one property for optimization we used the ion beam current measured with a Faraday-cup detector. As second optimization-property we the on-line processed time-resolved signal of the individual ion-source pulses employing the relatively new Matrix-Profile Algorithm* which provides a measure for the shot-by-shot variability of the consecutive pulses. We will report on the status of the data logging framework, the implementation of related software programs and the results of first tests. * Wilhelmstötter, F.: Jenetics advanced genetic algorithm, online http://jenetics.io ** Matrix Profile Foundation. Homepage, online https://github.com/matrix-profile-foundation
	Poster TUPAB300 [5.485 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB300
About •	paper received ※ 01 June 2021 paper accepted ※ 21 June 2021 issue date ※ 16 August 2021
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TUPAB302	Arrival Time Stabilization at Flash Using the Bunch Arrival Corrector Cavity (BACCA)	2194
	B. Lautenschlager, Ł. Butkowski, M.K. Czwalinna, B. Dursun, M. Hierholzer, S. Pfeiffer, H. Schlarb, Ch. Schmidt DESY, Hamburg, Germany
	For pump-probe and seeding experiments at free electron lasers, a femtosecond precise bunch arrival time stability is mandatory. To stabilize the arrival times a fast longitudinal intra bunch-train feedback (L-IBFB) using bunch arrival time monitors is applied. The electron bunch energy prior to a bunch compression chicane is modulated by superconducting radio frequency (SRF) cavities to compensate fast arrival time fluctuations of the subsequent bunches. A broadband normal conducting RF cavity was installed in front of the first bunch compression chicane at FLASH. The L-IBFB uses the normal conducting cavity for small but fast energy corrections together with the SRF cavities for larger and slower corrections. Current measurements show arrival time stabilities of the electron bunches towards 5 fs (rms) at the end of the linac, if the normal conducting cavity acts together with the SRF cavities in the L-IBFB system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB302
About •	paper received ※ 19 May 2021 paper accepted ※ 23 June 2021 issue date ※ 26 August 2021
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TUPAB304	Preliminary Investigation of the Noises and Updates on Physics Studies of FOFB in HEPS	2197
	X.Y. Huang, Y. Jiao, Y. Wei IHEP, Beijing, People’s Republic of China
	High Energy Photon Source (HEPS) is a Fourth-generation storage ring light source in China and is under construction. Noises, such as the ambient mechanical vibration and the power supply ripples of magnets, may induce large orbit motions of electron bunches and hence dramatically degrade the emitted photon beam quality. The effect of noises becomes significant and needs to be considered very carefully, especially when the emittances of the electron beam approach the diffraction limit of x-ray. For the HEPS, the noises are modelled and the total beam orbit motion is evaluated considering the spectral characteristics of all the transformation processes from the errors to the orbit. In this paper, we present the preliminary calculation of the effects of noises in HEPS, and the control of the orbit motion with the FOFB system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB304
About •	paper received ※ 17 May 2021 paper accepted ※ 02 July 2021 issue date ※ 16 August 2021
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TUPAB306	Status of Beam-Based Feedback Research and Development for Continuous Wave SRF Linac ELBE	2200
	A. Maalberg, M. Kuntzsch HZDR, Dresden, Germany E. Petlenkov TalTech, Tallinn, Estonia
	The superconducting electron linear accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf is a versatile light source operated in continuous wave mode. As the demand on the beam stability increases, the improvement of the beam control schemes currently installed at ELBE becomes highly relevant. This improvement can be achieved by an upgrade of the existing digital MicroTCA.4-based LLRF control scheme by beam-based feedback. By presenting both the design and implementation details of the new control scheme this contribution reports the status of the work in progress.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB306
About •	paper received ※ 19 May 2021 paper accepted ※ 21 June 2021 issue date ※ 30 August 2021
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THXB02	Beam Arrival Stability at the European XFEL	3714
	M.K. Czwalinna, J. Kral, B. Lautenschlager, J. Müller, H. Schlarb, S. Schulz, B. Steffen DESY, Hamburg, Germany R. Boll, H. Kirkwood, J. Koliyadu, R. Letrun, J. Liu, F. Pallas, D.E. Rivas, T. Sato EuXFEL, Schenefeld, Germany
	Free electron laser facilities, such as the European XFEL, make increasingly high demands on the longterm temporal stability and uniformity of the electron bunches, as pump-probe experiments meanwhile aim for timing stabilities of few femtoseconds residual jitter only. For a beam-based feedback control of the linear accelerator, electro-optical bunch arrival-time monitors are deployed, achieving a time resolution better than 3 fs. In a first attempt, we recently demonstrated a beam-based feedback system, reducing the arrival time jitter of the electron bunches to the 10 fs level with stable operation over hours. For pump-probe experiments it is crucial to equally verify this new level of precision in the FEL pulse arrival time with independent methods. In this work, we are discussing first results from examining the facility-wide temporal stability at the European XFEL, with attention to the contributions of various sub-systems and on the different time scales.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXB02
About •	paper received ※ 19 May 2021 paper accepted ※ 20 July 2021 issue date ※ 23 August 2021
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THXB05	Inverse Orbit Response Matrix Measurements: A Possible On-Line Tool for Optics Control in Storage Rings	3724
	Z. Martí, G. Benedetti, U. Iriso, E. Morales ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	We propose a novel technique to measure the linear optics in storage rings based on the acquisition of the inverse orbit response matrix (iORM). The iORM consists in the orbit correctors magnets (OCM) strength changes needed to produce a local orbit variation in each beam position monitor (BPM). This measurement can be implemented by introducing sequentially small changes in the BPM offsets and logging the OCM setting variations when the orbit correction is running. Very high precision and accuracy in the OCM set-points is required which poses a considerable challenge. Since the orbit feedback (FOFB) is kept running, the iORM could potentially be acquired in parallel to users storage ring operation. Since the iORM is very linear and local, optics perturbations could be easily diagnosed online. This paper introduces the iORM measurement concept and presents the progress of these studies at ALBA, where the implementation of this technique is limited by hysteresis effects in the OCM and the FOFB performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXB05
About •	paper received ※ 19 May 2021 paper accepted ※ 29 July 2021 issue date ※ 12 August 2021
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THPAB257	Fast Orbit Corrector Power Supply in MTCA.4 Form Factor for Sirius Light Source	4307
	A.F. Giachero, G.B.M. Bruno, L.M. Russo, D.O. Tavares LNLS, Campinas, Brazil
	A new fast orbit feedback (FOFB) hardware architecture has been pursued at Sirius. The fast corrector magnets’ are fed by power supply modules which are placed in the same MicroTCA.4 crates where the BPM digitizers and FOFB controllers are located. Each channel is made of a 3-Watt linear amplifier whose output currents are digitally controlled by the same FPGA where the distributed orbit feedback controller is processed. The amplifier is specified to reach up to 10 kHz small-signal bandwidth on a 3.5 mH inductance magnet and ±1 A full scale, which translates to 30 urad deflection on Sirius’ 3 GeV beam. Such a high level of integration aims at minimizing the overall latency of the FOFB loop while leveraging the crate infrastructure, namely electronics enclosure, DC power, cooling, and hardware management support already provided by the MTCA.4 crates. The fast corrector power supply channels are placed on Rear Transition Modules (RTMs) which are attached to the front AMC FPGA module where the FOFB controller is implemented. This paper will describe the main design concepts and report on the experimental results of the first prototypes.
	Poster THPAB257 [48.881 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB257
About •	paper received ※ 22 May 2021 paper accepted ※ 27 July 2021 issue date ※ 20 August 2021
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THPAB258	Status of Time-Domain Simulation for the Fast Orbit Feedback System at the HEPS	4311
	Y. Wei, Z. Duan, X.Y. Huang, Y. Jiao IHEP, Beijing, People’s Republic of China
	High Energy Photon Source (HEPS) is a complex designed at ultra-low emittance. A fast orbit feedback system is proposed to meet the requirement of beam orbit stability at the sub-micron level. In this paper, we present our work on setting up an orbit feedback process combined with noise model, system modeling, and particle tracking in the time domain. RF phase parameter is adjusted together with fast correctors to mitigate the orbit fluctuation due to energy vibration. The preliminary results are shown here. By the following optimization, we hope to provide an effective tool to specify and configure the FOFB system with the simulation.
	Poster THPAB258 [1.334 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB258
About •	paper received ※ 19 May 2021 paper accepted ※ 27 July 2021 issue date ※ 31 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB264	FOFB System Upgrade to ZynqMP FPGA with Fast ORM Measurement	4322
	Y.E. Tan, S. Chen, R.B. Hogan, A. Michalczyk AS - ANSTO, Clayton, Australia
	The FOFB processor has been ported from a Vertex 6 FPGA to a ZynqMP SoC (System on Chip) to provide additional resources to include the enhanced orbit diagnostics (EOD) system that has been designed to inject sinusoidal and pink noise through the feedback loop. The amplitude, duration, phase and frequency of sinusoidal, amplitude and duration of pink noise is user programmable.
	Poster THPAB264 [1.601 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB264
About •	paper received ※ 04 June 2021 paper accepted ※ 26 July 2021 issue date ※ 15 August 2021
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THPAB309	New Working Tune Feedback System for TLS	4394
	S.J. Huang, Y.K. Lin, Y.C. Lin NSRRC, Hsinchu, Taiwan
	TLS storage ring has two sets of working tuning feedback systems: one is used to correct the working tune deviation caused by insertion device U90; another system uses a local trim coil to correct the working tune deviation caused by all insertion devices. This article describes a new working tune feedback system in TLS that can correct the working tune effectively back to the required conditions for operation; the two existing feedback systems do not cause problems. We can both avoid increasing the local radiation dose and decreasing the injection efficiency.
	Poster THPAB309 [0.831 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB309
About •	paper received ※ 15 May 2021 paper accepted ※ 02 July 2021 issue date ※ 23 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

The Phase Loop Status of the RF System in CSNS/RCS

2076

L. Huang, X. Li, S. Wang
IHEP, Beijing, People’s Republic of China
M.T. Li, H.Y. Liu
IHEP CSNS, Guangdong Province, People’s Republic of China
Y. Liu
DNSC, Dongguan, People’s Republic of China

The Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) is a high intensity proton accelerator. The acceleration system consists of eight ferrite loaded cavities. The RCS is the space charge dominant machine and it is mitigated through the bunch factor optimization in the beam commissioning, so the injected beam will occupy a larger bucket size and unavoidable mismatch with the bucket, thus the dipole oscillation is excited. The phase loop scheme is designed to restrict the oscillation in the RF system, but the transmission efficiency is reduced by the phase loop and the bunch factor also increases, so the phase loop scheme is studied. To keep the phase loop but also maintain the transmission efficiency, we optimized the original phase loop scheme, but the beam loss still increases small when the loop on.

Poster TUPAB263 [1.548 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB263

About •

paper received ※ 13 May 2021 paper accepted ※ 02 June 2021 issue date ※ 21 August 2021

Export •

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

TUPAB299

Tuned Delay Unit for a Stochastic Cooling System at NICA Collider

2186

S.V. Barabin, T. Kulevoy, D.A. Liakin, A.Y. Orlov
ITEP, Moscow, Russia
I.V. Gorelyshev, K.G. Osipov, V.V. Peshkov, A.O. Sidorin
JINR/VBLHEP, Dubna, Moscow region, Russia

Stochastic cooling is one of the crucial NICA (Nuclotron-based Ion Collider fAcility) subsystems. This system requires fine tuning of the response delay to the kicker, for both longitudinal and transverse stochastic cooling systems. The use of a digital delay line allows to add additional features such as a frequency dependent group velocity correction. To analyse the capabilities of the digital delay unit, a prototype of the device was created and tested. The article presents the characteristics of the prototype, its architecture and principle of operation, test results and estimations for the future developments.

Poster TUPAB299 [0.493 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB299

About •

paper received ※ 17 May 2021 paper accepted ※ 10 June 2021 issue date ※ 16 August 2021

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

TUPAB300

Ion Source Optimization Using Bi-Objective Genetic and Matrix-Profile Algorithm

2190

W. Geithner, Z. Andelkovic, O. Geithner, F. Herfurth, V. Rapp
GSI, Darmstadt, Germany
A. Neméth
Atato, Alzenau, Germany
A. Van Benschoten
MPF, Plymouth, Minnesota, USA
F. Wilhelmstötter
emarsys, Vienna, Austria

Employing the local ECR ion source of the FAIR phase 0 ion storage ring CRYRING@ESR, we set up an IT-environment for on-line data processing and applications based on the data available from beam diagnostic instruments and input signals controlling the ion source. As a first proof of principle, we implemented a closed-loop optimization software controller based on bi-objective Genetic Optimization*. As one property for optimization we used the ion beam current measured with a Faraday-cup detector. As second optimization-property we the on-line processed time-resolved signal of the individual ion-source pulses employing the relatively new Matrix-Profile Algorithm** which provides a measure for the shot-by-shot variability of the consecutive pulses. We will report on the status of the data logging framework, the implementation of related software programs and the results of first tests.
* Wilhelmstötter, F.: Jenetics advanced genetic algorithm, online http://jenetics.io
** Matrix Profile Foundation. Homepage, online https://github.com/matrix-profile-foundation

Poster TUPAB300 [5.485 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB300

About •

paper received ※ 01 June 2021 paper accepted ※ 21 June 2021 issue date ※ 16 August 2021

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

TUPAB302

Arrival Time Stabilization at Flash Using the Bunch Arrival Corrector Cavity (BACCA)

2194

B. Lautenschlager, Ł. Butkowski, M.K. Czwalinna, B. Dursun, M. Hierholzer, S. Pfeiffer, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany

For pump-probe and seeding experiments at free electron lasers, a femtosecond precise bunch arrival time stability is mandatory. To stabilize the arrival times a fast longitudinal intra bunch-train feedback (L-IBFB) using bunch arrival time monitors is applied. The electron bunch energy prior to a bunch compression chicane is modulated by superconducting radio frequency (SRF) cavities to compensate fast arrival time fluctuations of the subsequent bunches. A broadband normal conducting RF cavity was installed in front of the first bunch compression chicane at FLASH. The L-IBFB uses the normal conducting cavity for small but fast energy corrections together with the SRF cavities for larger and slower corrections. Current measurements show arrival time stabilities of the electron bunches towards 5 fs (rms) at the end of the linac, if the normal conducting cavity acts together with the SRF cavities in the L-IBFB system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB302

About •

paper received ※ 19 May 2021 paper accepted ※ 23 June 2021 issue date ※ 26 August 2021

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

TUPAB304

Preliminary Investigation of the Noises and Updates on Physics Studies of FOFB in HEPS

2197

X.Y. Huang, Y. Jiao, Y. Wei
IHEP, Beijing, People’s Republic of China

High Energy Photon Source (HEPS) is a Fourth-generation storage ring light source in China and is under construction. Noises, such as the ambient mechanical vibration and the power supply ripples of magnets, may induce large orbit motions of electron bunches and hence dramatically degrade the emitted photon beam quality. The effect of noises becomes significant and needs to be considered very carefully, especially when the emittances of the electron beam approach the diffraction limit of x-ray. For the HEPS, the noises are modelled and the total beam orbit motion is evaluated considering the spectral characteristics of all the transformation processes from the errors to the orbit. In this paper, we present the preliminary calculation of the effects of noises in HEPS, and the control of the orbit motion with the FOFB system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB304

About •

paper received ※ 17 May 2021 paper accepted ※ 02 July 2021 issue date ※ 16 August 2021

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

TUPAB306

Status of Beam-Based Feedback Research and Development for Continuous Wave SRF Linac ELBE

2200

A. Maalberg, M. Kuntzsch
HZDR, Dresden, Germany
E. Petlenkov
TalTech, Tallinn, Estonia

The superconducting electron linear accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf is a versatile light source operated in continuous wave mode. As the demand on the beam stability increases, the improvement of the beam control schemes currently installed at ELBE becomes highly relevant. This improvement can be achieved by an upgrade of the existing digital MicroTCA.4-based LLRF control scheme by beam-based feedback. By presenting both the design and implementation details of the new control scheme this contribution reports the status of the work in progress.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB306

About •

paper received ※ 19 May 2021 paper accepted ※ 21 June 2021 issue date ※ 30 August 2021

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

THXB02

Beam Arrival Stability at the European XFEL

3714

M.K. Czwalinna, J. Kral, B. Lautenschlager, J. Müller, H. Schlarb, S. Schulz, B. Steffen
DESY, Hamburg, Germany
R. Boll, H. Kirkwood, J. Koliyadu, R. Letrun, J. Liu, F. Pallas, D.E. Rivas, T. Sato
EuXFEL, Schenefeld, Germany

Free electron laser facilities, such as the European XFEL, make increasingly high demands on the longterm temporal stability and uniformity of the electron bunches, as pump-probe experiments meanwhile aim for timing stabilities of few femtoseconds residual jitter only. For a beam-based feedback control of the linear accelerator, electro-optical bunch arrival-time monitors are deployed, achieving a time resolution better than 3 fs. In a first attempt, we recently demonstrated a beam-based feedback system, reducing the arrival time jitter of the electron bunches to the 10 fs level with stable operation over hours. For pump-probe experiments it is crucial to equally verify this new level of precision in the FEL pulse arrival time with independent methods. In this work, we are discussing first results from examining the facility-wide temporal stability at the European XFEL, with attention to the contributions of various sub-systems and on the different time scales.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXB02

About •

paper received ※ 19 May 2021 paper accepted ※ 20 July 2021 issue date ※ 23 August 2021

Export •

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

THXB05

Inverse Orbit Response Matrix Measurements: A Possible On-Line Tool for Optics Control in Storage Rings

3724

Z. Martí, G. Benedetti, U. Iriso, E. Morales
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

We propose a novel technique to measure the linear optics in storage rings based on the acquisition of the inverse orbit response matrix (iORM). The iORM consists in the orbit correctors magnets (OCM) strength changes needed to produce a local orbit variation in each beam position monitor (BPM). This measurement can be implemented by introducing sequentially small changes in the BPM offsets and logging the OCM setting variations when the orbit correction is running. Very high precision and accuracy in the OCM set-points is required which poses a considerable challenge. Since the orbit feedback (FOFB) is kept running, the iORM could potentially be acquired in parallel to users storage ring operation. Since the iORM is very linear and local, optics perturbations could be easily diagnosed online. This paper introduces the iORM measurement concept and presents the progress of these studies at ALBA, where the implementation of this technique is limited by hysteresis effects in the OCM and the FOFB performance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXB05

About •

paper received ※ 19 May 2021 paper accepted ※ 29 July 2021 issue date ※ 12 August 2021

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

THPAB257

Fast Orbit Corrector Power Supply in MTCA.4 Form Factor for Sirius Light Source

4307

A.F. Giachero, G.B.M. Bruno, L.M. Russo, D.O. Tavares
LNLS, Campinas, Brazil

A new fast orbit feedback (FOFB) hardware architecture has been pursued at Sirius. The fast corrector magnets’ are fed by power supply modules which are placed in the same MicroTCA.4 crates where the BPM digitizers and FOFB controllers are located. Each channel is made of a 3-Watt linear amplifier whose output currents are digitally controlled by the same FPGA where the distributed orbit feedback controller is processed. The amplifier is specified to reach up to 10 kHz small-signal bandwidth on a 3.5 mH inductance magnet and ±1 A full scale, which translates to 30 urad deflection on Sirius’ 3 GeV beam. Such a high level of integration aims at minimizing the overall latency of the FOFB loop while leveraging the crate infrastructure, namely electronics enclosure, DC power, cooling, and hardware management support already provided by the MTCA.4 crates. The fast corrector power supply channels are placed on Rear Transition Modules (RTMs) which are attached to the front AMC FPGA module where the FOFB controller is implemented. This paper will describe the main design concepts and report on the experimental results of the first prototypes.

Poster THPAB257 [48.881 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB257

About •

paper received ※ 22 May 2021 paper accepted ※ 27 July 2021 issue date ※ 20 August 2021

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THPAB258

Status of Time-Domain Simulation for the Fast Orbit Feedback System at the HEPS

4311

Y. Wei, Z. Duan, X.Y. Huang, Y. Jiao
IHEP, Beijing, People’s Republic of China

High Energy Photon Source (HEPS) is a complex designed at ultra-low emittance. A fast orbit feedback system is proposed to meet the requirement of beam orbit stability at the sub-micron level. In this paper, we present our work on setting up an orbit feedback process combined with noise model, system modeling, and particle tracking in the time domain. RF phase parameter is adjusted together with fast correctors to mitigate the orbit fluctuation due to energy vibration. The preliminary results are shown here. By the following optimization, we hope to provide an effective tool to specify and configure the FOFB system with the simulation.

Poster THPAB258 [1.334 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB258

About •

paper received ※ 19 May 2021 paper accepted ※ 27 July 2021 issue date ※ 31 August 2021

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

THPAB264

FOFB System Upgrade to ZynqMP FPGA with Fast ORM Measurement

4322

Y.E. Tan, S. Chen, R.B. Hogan, A. Michalczyk
AS - ANSTO, Clayton, Australia

The FOFB processor has been ported from a Vertex 6 FPGA to a ZynqMP SoC (System on Chip) to provide additional resources to include the enhanced orbit diagnostics (EOD) system that has been designed to inject sinusoidal and pink noise through the feedback loop. The amplitude, duration, phase and frequency of sinusoidal, amplitude and duration of pink noise is user programmable.

Poster THPAB264 [1.601 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB264

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paper received ※ 04 June 2021 paper accepted ※ 26 July 2021 issue date ※ 15 August 2021

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THPAB309

New Working Tune Feedback System for TLS

4394

S.J. Huang, Y.K. Lin, Y.C. Lin
NSRRC, Hsinchu, Taiwan

TLS storage ring has two sets of working tuning feedback systems: one is used to correct the working tune deviation caused by insertion device U90; another system uses a local trim coil to correct the working tune deviation caused by all insertion devices. This article describes a new working tune feedback system in TLS that can correct the working tune effectively back to the required conditions for operation; the two existing feedback systems do not cause problems. We can both avoid increasing the local radiation dose and decreasing the injection efficiency.

Poster THPAB309 [0.831 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB309

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paper received ※ 15 May 2021 paper accepted ※ 02 July 2021 issue date ※ 23 August 2021

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