Keyword: feedback
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TUMPA05 OPC UA to DOOCS Bridge: A Tool for Automated Integration of Industrial Devices Into the Accelerator Control Systems at FLASH and European XFEL ion, controls, laser, PLC 344
  • F. Peters, I. Hartl, C. Mohr, L. Winkelmann
    DESY, Hamburg, Germany
  Integrating off-the-shelf industrial devices into an accelerator control system often requires resource-consuming and error-prone software development to implement device-specific communication protocols. With recent progress in standards for industrial controls, more and more devices leverage the OPC UA machine-to-machine communication protocol to publish their functionality via an embedded information model. Here we present a generic DOOCS server, which uses a device's published OPC UA information model for automatic integration into the accelerator control systems of the FLASH and European XFEL free-electron laser facilities. The software makes all the device's variables and methods immediately accessible as DOOCS properties, reducing software development time and errors. We demonstrate that the server's and protocol's latency allows DOOCS-based burst-to-burst feedback in the 10Hz operation modes of FLASH and European XFEL and is capable of handling more than 104 data update events per second, without degrading performance. We also report on the successful integration of a commercial laser amplifier, as well as our own PLC-based laser protection system into DOOCS.  
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TUPHA033 Availability Analysis and Tuning Tools at the Light Source Bessy II ion, operation, experiment, injection 446
  • R. Müller, T. Birke, A. Jankowiak, V. Laux, I. Müller, A. Schälicke
    HZB, Berlin, Germany
  Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association.
The 1.7GeV light source BESSY II features about 50 beamlines overbooked by a factor of 2 on the average. Thus availability of high quality synchrotron radiation (SR) is a central asset. SR users at BESSY II can base their beam time expectations on numbers generated according to the common operation metrics*. Major failures of the facility are analyzed according to * and displayed in real time, analysis of minor detriments are provided regularly by off line tools. Many operational constituents are required for extraordinary availability figures: meaningful alarming and dissemination of notifications, complete logging of program, device, system and operator activities, post mortem analysis and data mining tools. Preventive and corrective actions are enabled by consequent root cause analysis based on accurate eLog entries, trouble ticketing and consistent failure classifications. This paper describes the tool sets, developments, their implementation status and some showcase results at BESSY II.
* Common operation metrics for storage ring light sources, A. Luedeke, M. Bieler, R.H.A. Farias, S. Krecic, R. Mueller, M. Pont, and M. Takao, Phys. Rev. Accel. Beams 19, 082802
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TUPHA111 A Major Performance Upgrade to the Transverse Feedback System at the Advance Photon Source ion, FPGA, operation, photon 674
  • N.P. DiMonte, C. Yao
    ANL, Argonne, Illinois, USA
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
With the success and reliability of the transverse feedback system installed at the Advance Photon Source (APS), a major upgrade to expand the system is under way. The existing system is operating at a third of the storage ring bunch capacity, or 324 of the available 1296 bunches. This upgrade will allow the sampling of all 1296 bunches and make corrections for all selected bunches in a single storage ring turn. To facilitate this upgrade a new analog I/O board capable of 352 MHz operation was developed along with a revolution clock cleaning circuit. A 352MHz clock cleaning circuit was also required for the high-speed analog output circuit to maintain data integrity to the receiving DAC unit that is 61m away. This receiving DAC unit will have its transceiver data rate upgraded from 2.3Gbps to about 7Gbps transmitted over a fiber optic link. This paper discusses some of the challenges in reducing the clock jitter from both the system P0 bunch clock and the 352MHz clock along with the necessary FPGA hardware upgrades and algorithm changes, all of which is required for the success of this upgrade.
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TUPHA134 Do You Really Need a Low Current Amplifier to Drive a Low Current Motor? ion, controls, experiment, impedance 730
  • O. Ivashkevych, A. Munoz, D. Poshka
    BNL, Upton, Long Island, New York, USA
  NSLS2 is standardized on Geo Brick LV Delta Tau 5A motor controller, suitable to drive majority of stepper and servo motors. Standardization allows less spare inventory and common skill set to maintain. However, some applications especially instruments in the space confined endstations require using small, or even miniature motors. The question that we address, what are the options in customizing the 5A unit for driving low current motors, and what are the limitations? In this paper, we present a quantitative comparison of drive currents and performance data collected with Delta Tau PeWin software and external test equipment for a variety of low current steppers and servomotors with and without encoders ranging from 45mA to 250mA. Delta Tau Geo Brick LV comes in different amplifier configurations: a combination of 5A, 1A, and 0.25A amplifiers. While all configurations are tested, research goal is focused on performance and limitations of 5A driver, avoiding using step and direction option with extra hardware. Performance of widely used Newport MFA-PP and MFA-CC also will be discussed.  
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WEAPL01 Present and Future of Harmony Bus, a Real-Time High Speed Bus for Data Transfer Between FPGA Cores ion, FPGA, software, controls 1012
  • M. Broseta, J.A. Avila-Abellan, S. Blanch-Torné, G. Cuní, D. Fernández-Carreiras, O. Matilla, M. Rodriguez, J. Salabert, X. Serra-Gallifa
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  When feedback loops latencies shall be lower than milliseconds range the performance of FPGA-based solutions are unrivaled. One of the main difficulties in these solutions is how to make compatible a full custom digital design with a generic interface and the high-level control software. ALBA simplified the development process of electronic instrumentation with the use of Harmony Bus (HB)*. Based on the Self-Describing Bus, developed at CERN/GSI, it creates a bus framework where different modules share timestamped data and generate events. This solution enables the high-level control software in a Single Board Computer or PC, to easily configure the expected functionally in the FPGA and manage the real-time data acquired. This framework has been already used in the new Em# electrometer**, produced within a collaboration between ALBA and MAXIV, that is currently working in both synchrotrons. Future plans include extending the FPGA cores library, high-level functions and the development of a new auto-generation tool able to dynamically create the FPGA configuration file simplifying the development process of new functionalities.
* 'A Generic Fpga Based Solution for Flexible Feedback Systems', PCaPAC16, paper FRFMPLCO06
** 'Em# Electrometer Comes To Light', ICALEPS 2017 Abstract Submitted
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WEAPL04 Nanoprobe Results: Metrology & Control in Stacked Closed-Loop Systems ion, controls, TANGO, synchrotron 1028
  • C. Engblom, Y.-M. Abiven, F. Alves, N. Jobert, S.K. Kubsky, F. Langlois, A. Lestrade
    SOLEIL, Gif-sur-Yvette, France
  • T. Stankevic
    MAX IV Laboratory, Lund University, Lund, Sweden
  Over the course of four years, the Nanoprobe project worked to deliver prototypes capable of nm-precision and accuracy with long-range millimetric sample positioning in 3D- scanning tomography for long beamline endstations of Synchrotron Soleil and MAXIV. The ambition of the project necessitated a joint progress between several fields of expertise combining mechanics, metrology, motion control, and software programming. Interferometry in stage characterization has been a crucial point; not only to qualify motion errors but to actively integrate it into control systems with feedback and/or feedforward schemes in order to reduce XYZ position errors down to the nm- level. As such, a new way of characterizing rotation stages was developed and ultimately used in control schemes utilising the Delta Tau PowerPMAC platform. This paper details the obtained results as well as the methodology and approach of the project to achieve this.  
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THMPA02 Investigations of Spatial Process Model for the Closed Orbit Feedback System at the Sis18 Synchrotron at GSI ion, closed-orbit, synchrotron, acceleration 1301
  • S.H. Mirza, P. Forck, H. Klingbeil, R. Singh
    GSI, Darmstadt, Germany
  • H. Klingbeil
    TEMF, TU Darmstadt, Darmstadt, Germany
  Funding: The work is supported by the Deutscher Akademischer Austauschdienst under contact No. 91605207
A closed orbit feedback system is under development at the GSI SIS18 synchrotron for usage during the whole acceleration cycle including the acceleration ramp. Singular value decomposition (SVD) is the most widely used technique in global closed orbit correction for eigenmode decomposition, mode selection and pseudo-inversion of Orbit Response Matrix (ORM) for robust calculation of corrector magnet strengths. A new faster inversion technique based upon Discrete Fourier Transform (DFT) has been proposed for SIS18 ORM exploiting the Circulant symmetry, a class of matrices which can be diagonalized by the DFT using only one row or column of the matrix. The existence of a clear relationship between SVD modes and singular values to DFT modes and coefficients for such matrices has been described. The DFT based decomposition of Circulant ORM gives hints on physical interpretation of SVD and DFT modes of perturbed closed orbit in a synchrotron. As a first practical application, DFT modes were used to provide robustness against sensor failures such as one or two malfunctioning BPMs.
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THPHA013 Control System Projects at the Electron Storage Ring DELTA ion, controls, EPICS, network 1361
  • D. Schirmer, A. Althaus, P. Hartmann, D. Rohde
    DELTA, Dortmund, Germany
  Data logging and archiving is an important task to identify and investigate malfunctions during storage ring operation. In order to enable a high-performance fault analysis, large amounts of data must be processed effectively. For this purpose a fundamental redesign of the present SQL database was necessary. The VME/VxWorks-driven CAN bus has been used for many years as the main field bus of the DELTA control system. Unfortunately, the corresponding CAN bus I/O modules were discontinued by the manufacturer. Thus, the CAN field bus is currently being replaced by a more up to date Modbus/TCP-IP communication (WAGO), which largely supersedes the VME/VxWorks layer. After hard- and software integration into the EPICS environment, several projects have been realized using this powerful field bus communication. The server migration to a 64-bit architecture was already carried out in the past. By now, all client programs and software tools have also been converted to 64-bit versions. In addition, the fast orbit feedback system project, using an in-house developed FPGA-based hardware, has been resumed. This report provides an overview of the developments and results of each project.  
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THPHA072 A Position Encoder Processing Unit ion, controls, data-acquisition, SRF 1557
  • R. Hino, P. Fajardo, N. Janvier, T. Le Caër, F. Le Mentec
    ESRF, Grenoble, France
  Typical motion controllers rely on a feedback position encoder to detect the actuator output and correct for external factors. Recent advancements in positioning systems increased the demand for the ability to process a variety of sensors and use the result to feedback the motion controller. In addition, data acquisition tools are becoming essential for metrology purposes to diagnose and analyse the behaviour of the system. A multi-sensor, multi-protocol unit with processing and data acquisition capabilities has been developed to address these requirements. Here we describe the main features of this unit, its internal architecture, and few examples of application.  
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THPHA115 A New Transverse and Longitudinal Bunch by Bunch Feedback Processor ion, controls, FPGA, operation 1649
  • M.G. Abbott, G. Rehm, I.S. Uzun
    DLS, Oxfordshire, United Kingdom
  We describe the development of firmware to support Longitudinal Bunch by Bunch Feedback at Diamond Light source. As well as feedback, the system supports complex experiments and the capture of detailed electron beam diagnostics. In this paper we describe the firmware development and some details of the processing chain. We focus on some of the challenges of FPGA development from the perspective of a software engineer.  
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THPHA122 Optimization and Upgrade of Slow Extraction Control System for HIRFL CSR Main Ring ion, controls, extraction, database 1663
  • Y.C. Chen
    Chen Yucong, ChengGuan, People's Republic of China
  • J.M. Dong, Y.C. Feng, M. Li, S. Li, W.L. Li, R.S. Mao, J. Shi, T.C. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  The heavy ion beam from Heavy Ion Research Facility in Lanzhou (HIRFL) CSR Main Ring (CSRm) is slowly extracted by using a third-order resonance driven by sextupole magnets and delivered to various experimental facilities. The slow extraction is driven by the transverse radio frequency knockout (RF-KO) exciter. Many physics and radiation medicine experiments require high-quality spill-structure. In other words, the extracted spill should have flat structure and low ripple noise [1]. Therefore, a novel RF-KO exciter and spill feedback control system has been implemented and tested in CSRm.
[1] Onuma S, Ichikawa T, Mochiki K I, et al. DEVELOPMENT OF SPILL CONTROL SYSTEM FOR THE J-PARC SLOW EXTRACTION[J]. Proceedings of Pac, 2009.
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THPHA127 Status of the Fast Orbit Feedback System for the TPS ion, controls, MMI, power-supply 1670
  • P.C. Chiu, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Huang
    NSRRC, Hsinchu, Taiwan
  TPS started its user service in 2016. To ensure stable beam can delivery to user, the fast orbit feedback system were deploy to ensure stable orbit. The system have been commissioning in the second quarter of 2016. Improvement of the system since then solved various problems unexpected. This report will summarizes system configuration of the fast orbit feedback and the operation experiences.  
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THPHA128 Applications of Kalman State Estimation in Current Monitor Diagnostic Systems ion, target, simulation, diagnostics 1673
  • J.O. Hill
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by US Department of Energy under contract DE-AC52-06NA25396.
Traditionally, designers of transformer-based beam current monitor diagnostic systems are constrained by fundamental trade-offs when reducing distortion in time-domain beam-pulse facsimile waveforms while also attempting to preserve information in the frequency-domain. When modelling the sensor system with a net-work of linear time-invariant passive components, and a state-based representation based on first-order differential equations, we identify two internal dynamical states isolated from each other by the parasitic resistance in the transformer windings. They are the parasitic capacitance voltage across the transformer's windings, and the transformer inductor current. These states are typically imperfectly observed due to noise, component value variance, and sensor component network topology. We will discuss how feedback-based Kalman State Estimation implemented within digital signal-processing might be employed to reduce negative impacts of noise along with component variance, and how Kalman Estimation might also optimize the conflicting goals of beam-pulse facsimile waveform fidelity together with preservation of fre-quency domain information.
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