ICALEPCS2017 - List of Keywords (FEL)

Paper	Title	Other Keywords	Page
MOAPL01	The Control System for the Linear Accelerator at the European XFEL: Status and First Experiences	ion, controls, MMI, photon	1
	T. Wilksen, A. Aghababyan, R. Bacher, P.K. Bartkiewicz, C. Behrens, T. Delfs, P. Duval, L. Fröhlich, W. Gerhardt, C. Gindler, O. Hensler, K. Hinsch, J.M. Jäger, R. Kammering, S. Karstensen, H. Kay, H. Kay, V. Kocharyan, A. Labudda, T. Limberg, S.M. Meykopff, A. Petrosyan, G. Petrosyan, L.P. Petrosyan, V. Petrosyan, P. Pototzki, K.R. Rehlich, G. Schlesselmann, E. Sombrowski, M. Staack, J. Szczesny, M. Walla, J. Wilgen, H. Wu DESY, Hamburg, Germany
	The European XFEL (E-XFEL) is a 3.4 km long X-ray Free-Electron Laser facility and consists of a superconducting, linear accelerator with initially three undulator beam lines. The construction and installation of the E-XFEL is being completed this year and commissioning is well underway. First photon beams are expected to be available for early users in the second half of 2017. This paper will focus on the control system parts for the linear accelerator with its more than 7 million parameters and highlight briefly its design and implementation. Namely the hardware framework based on the MicroTCA.4 standard, testing software concepts and components at real and virtual accelerator facilities and a well-established method for integrating high-level controls into the middle layer through a shot-synchronized data acquisition allowed for a rapid deployment and commissioning of the accelerator. Status and experiences from a technical and an operational point-of-view will be presented.
	Slides MOAPL01 [6.198 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-MOAPL01
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MOAPL04	SwissFEL Control System - Overview, Status, and Lessons Learned	ion, controls, network, electron	19
	E. Zimoch, A.D. Alarcon, D. Anicic, A.G. Bertrand, R. Biffiger, K. Bitterli, M. Boccioli, H. Brands, P. Bucher, T. Celcer, P. Chevtsov, E.J. Divall, S.G. Ebner, M. Gasche, F. Haemmerli, C.E. Higgs, T. Humar, M. Janousch, G. Janser, G. Jud, B. Kalantari, R. Kapeller, R.A. Krempaská, D.J. Lauk, M.P. Laznovsky, H. Lutz, D. Maier-Manojlovic, F. Märki, V. Ovinnikov, T. Pal, W. Portmann, S.G. Rees, T. Zamofing, C. Zellweger, D. Zimoch PSI, Villigen PSI, Switzerland
	The SwissFEL is a new free electron laser facility at the Paul Scherrer Institute (PSI) in Switzerland. Commissioning started in 2016 and resulted in first lasing in December 2016 (albeit not on the design energy). In 2017, the commissioning continued and will result in the first pilot experiments at the end of the year. The close interaction of experiment and accelerator components as well as the pulsed electron beam required a well thought out integration of the control system including some new concepts and layouts. This paper presents the current status of the control system together with some lessons learned.
	Talk as video stream: https://youtu.be/oaGDyYYzKJ4
	Slides MOAPL04 [2.258 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-MOAPL04
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MOCPL06	MARWIN: A Mobile Autonomous Robot for Maintenance and Inspection	ion, radiation, software, laser	76
	A. Dehne, T. Hermes, N. Moeller hs21, Buxtehude, Germany R. Bacher DESY, Hamburg, Germany
	MARWIN is a mobile autonomous robot platform designed for performing maintenance and inspection tasks alongside the European XFEL accelerator installation in operation in Hamburg, Germany. It consists of a 4-wheel drive chassis and a manipulator arm. Due to the unique Mecanum drive technology in combination with the manipulator arm the whole robot provides three degrees of freedom. MARWIN can be operated in a pre-configured autonomous as well as a remotely controlled mode. Its operation can be supervised through various cameras. The primary use case of MARWIN is measuring radiation fields. For this purpose MARWIN is equipped with both a mobile Geiger-Mueller tube mounted at the tip of the manipulator arm and a stationary multi-purpose radiation detector attached to the robot's chassis. This paper describes the mechanical and electrical setup of the existing prototype, the architecture and implementation of the controls routines, the strategy implemented to handle radiation-triggered malfunctions, and the energy management. In addition, it reports on recent operations experiences, envisaged improvements and further use cases.
	Talk as video stream: https://youtu.be/SRnZSWMhgQg
	Slides MOCPL06 [27.173 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-MOCPL06
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TUBPA03	Database Scheme for Unified Operation of SACLA / SPring-8	ion, database, operation, controls	201
	K. Okada, N. Hosoda, M. Ishii, T. Sugimoto, M. Yamaga JASRI/SPring-8, Hyogo-ken, Japan T. Fujiwara, T. Fukui, T. Maruyama, K. Watanabe RIKEN SPring-8 Center, Hyogo, Japan H. Sumitomo SES, Hyogo-pref., Japan
	For reliable accelerator operation, it is essential to have a centralized data handling scheme, for such as unique equipment ID's, archive and online data from sensors, and operation points and calibration parameters those are to be restored upon a change in operation mode. Since 1996, when SPring-8 got in operation, a database system has been utilized for this role. However, as time passes the original design got shorthanded and new features equipped upon requests pushed up maintenance costs. For example, as SACLA started in 2010, we introduced a new data format for the shot by shot synchronized data. Also number of tables storing operation points and calibrations increased with various formats. Facing onto the upgrade project at the site, it is the time to overhaul the whole scheme. In the plan, SACLA will be the high quality injector to a new storage ring while in operation as the XFEL user machine. To handle shot by shot multiple operation patterns, we plan to introduce a new scheme where multiple tables inherits a common parent table information. In this paper, we report the database design for the upgrade project and status of transition. http://rsc.riken.jp/pdf/SPring-8-II.pdf
	Slides TUBPA03 [0.950 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUBPA03
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TUCPL04	SwissFEL Timing System: First Operational Experience	ion, timing, controls, software	232
	B. Kalantari, R. Biffiger PSI, Villigen PSI, Switzerland
	The SwissFEL timing system builds on MRF's event system products. Performance and functional requirements have pushed MRF timing components to its newest generation (300 series) providing active delay compensation, conditional sequence events, and topology identification among others. However, employing available hardware functionalities to implement complex and varying operational demands and provide them in the control system has its own challenges. After a brief introduction to the new MRF hardware this paper describes operational aspects of the SwissFEL timing and related control system applications. We describe a new technique for beam rate control and how this scheme is used for the machine protection system (MPS). We show how a well thought modular software-side design enables us to maintain various rep rates across the facility and allows us to implement complex triggering patterns with minimum development effort. We also discuss our timestamping method and its interface to the beam synchronous data acquisition system. Further we share our experience in timing network installation, monitoring and maintenance issues during commissioning phase of the facility.
	Talk as video stream: https://youtu.be/CWx8QBpSxXc
	Slides TUCPL04 [5.381 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUCPL04
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TUCPA01	Data Analysis Support in Karabo at European XFEL	ion, data-analysis, experiment, controls	245
	H. Fangohr, M. Beg, V. Bondar, D. Boukhelef, S. Brockhauser, C. Danilevski, W. Ehsan, S.G. Esenov, G. Flucke, G. Giovanetti, D. Goeries, S. Hauf, B.C. Heisen, D.G. Hickin, D. Khakhulin, A. Klimovskaia, M. Kuster, P.M. Lang, L.G. Maia, L. Mekinda, T. Michelat, A. Parenti, G. Previtali, H. Santos, A. Silenzi, J. Sztuk-Dambietz, J. Szuba, M. Teichmann, K. Weger, J. Wiggins, K. Wrona, C. Xu XFEL. EU, Schenefeld, Germany S. Aplin, A. Barty, M. Kuhn, V. Mariani CFEL, Hamburg, Germany T. Kluyver University of Southampton, Southampton, United Kingdom
	We describe the data analysis structure that is integrated into the Karabo framework [1] to support scientific experiments and data analysis at European XFEL GmbH. The photon science experiments have a range of data analysis requirements, including online (i.e. near real-time during the actual measurement) and offline data analysis. The Karabo data analysis framework supports execution of automatic data analysis for routine tasks, supports complex experiment protocols including data analysis feedback integration to instrument control, and supports integration of external applications. The online data analysis is carried out using distributed and accelerator hardware (such as GPUs) where required to balance load and achieve near real-time data analysis throughput. Analysis routines provided by Karabo are implemented in C++ and Python, and make use of established scientific libraries. The XFEL control and analysis software team collaborates with users to integrate experiment specific analysis codes, protocols and requirements into this framework, and to make it available for the experiments and subsequent offline data analysis. [1] Heisen et al (2013) "Karabo: An Integrated Software Framework Combining Control, Data Management, and Scientific Computing Tasks". Proc. of 14th ICALEPCS 2013, Melbourne, Australia (p. FRCOAAB02)
	Slides TUCPA01 [10.507 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUCPA01
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TUCPA06	SwissFEL - Beam Synchronous Data Acquisition - The First Year	ion, data-acquisition, MMI, real-time	276
	S.G. Ebner, H. Brands, B. Kalantari, R. Kapeller, F. Märki, L. Sala, C. Zellweger PSI, Villigen PSI, Switzerland
	The SwissFEL beam-synchronous data-acquisition system is based on several novel concepts and technologies. It is targeted on immediate data availability and online processing and is capable of assembling an overall data view of the whole machine, thanks to its distributed and scalable back-end. Load on data sources is reduced by immediately streaming data as soon as it becomes available. The streaming technology used provides load balancing and fail-over by design. Data channels from various sources can be efficiently aggregated and combined into new data streams for immediate online monitoring, data analysis and processing. The system is dynamically configurable, various acquisition frequencies can be enabled, and data can be kept for a defined time window. All data is available and accessible enabling advanced pattern detection and correlation during acquisition time. Accessing the data in a code-agnostic way is also possible through the same REST API that is used by the web-frontend. We will give an overview of the design and specialities of the system as well as talk about the findings and problems we faced during machine commissioning.
	Slides TUCPA06 [5.107 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUCPA06
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TUMPA06	RF Heat Load Compensation for the European XFEL	ion, operation, controls, cavity	348
	M.R. Clausen, T. Boeckmann, J. Branlard, J. Eschke, O. Korth, J. Penning, B. Schoeneburg DESY, Hamburg, Germany
	The European XFEL is a 3.4km long X-ray Free Electron Laser. The accelerating structure consists of 96 cryo modules running at 1.3 GHz with 10 Hz repetition rate. The injector adds two modules running at 1.3 and 3.9 GHz respectively. The cryo modules are operated at 2 Kelvin. Cold compressors (CCs) pump down the liquid Helium to 30 mbar which corresponds to 2 Kelvin. Stable conditions in the cryogenic system are mandatory for successful accelerator operations. Pressure fluctuations at 2 K may cause detuning of cavities and could result in unstable CC operations. The RF losses in the cavities may be compensated by reducing the heater power in the liquid Helium baths of the nine cryogenic strings. This requires a stable readout of the current RF settings. The detailed signals are read out from several severs in the accelerator control system and then computed in the cryogenic control system for heater compensation. This paper will describe the commissioning of the cryogenic control system, the communication between the control systems involved and first results of machine operations with the heat loss compensation in place.
	Slides TUMPA06 [0.682 MB]
	Poster TUMPA06 [0.635 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUMPA06
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TUMPA07	Advances in Automatic Performance Optimization at FERMI	ion, laser, electron, experiment	352
	G. Gaio, N. Bruchon, M. Lonza Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy L. Saule University of Trieste, Trieste, Italy
	Despite the large number of feedback loops running simultaneously at the FERMI Free Electron Laser (FEL), they are not sufficient to keep the optimal machine working point in the long term, in particular when the machine is tuned in such a way to be more sensitive to drifts of the critical parameters. In order to guarantee the best machine performance, a novel software application which minimizes the shot to shot correlation between these critical parameters and the FEL radiation has been implemented. This application, which keeps spatially and temporally aligned the seed laser and the electron beam, contrary to many algorithms that inject noise in the system to be optimized, run transparently during the experiment beam times. In this paper we will also present a newly developed method to calculate a beam 'quality factor' starting from the images provided by a photon spectrometer, which tries to mimic the evaluation of machine physicists, as well as the results obtained using two model-less algorithms to optimize the FEL performance through maximization of the quality factor.
	Slides TUMPA07 [0.846 MB]
	Poster TUMPA07 [1.124 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUMPA07
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TUPHA039	Bunch Arrival Time Monitor Control Setup for SwissFEL Applications	ion, controls, software, data-acquisition	469
	P. Chevtsov, V.R. Arsov PSI, Villigen PSI, Switzerland M. Dach Dach Consulting GmbH, Brugg, Switzerland
	Bunch Arrival time Monitor (BAM) is a precise beam diagnostics instrument assessing the accelerator stability on-line. It is one of the most important components of the SwissFEL facility at the Paul Scherrer Institute (PSI). The overall monitor complexity demands the development of an extremely reliable control system that handles basic BAM operations. A prototype of such a system was created at PSI. The system is very flexible. It provides a set of tools allowing one to implement a number of advanced control features such as tagging experimental data with a SwissFEL machine pulse number or embedding high level control applications into the process controllers (IOC). The paper presents the structure of the BAM control setup. The operational experience with this setup is also discussed.
	Poster TUPHA039 [1.027 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA039
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TUPHA051	The Control System of Novosibirsk Free Electron Laser	ion, controls, electron, operation	513
	V.R. Kozak, E.A. Kuper, T.V. Salikova, P.A. Selivanov, S.S. Serednyakov, S.V. Tararyshkin, A.G. Tribendis, N.A. Vinokurov BINP SB RAS, Novosibirsk, Russia
	Novosibirsk Free electron Laser (FEL) based on multi-turn energy recovery linac is the source of coherent radiation with ability of wavelength tuning. It involves one single-turn and one 4-turn microtron-recuperator, which are have general injection channel and acceleration section. There are three different free electron lasers, mounted on different tracks of these accelerators, and operating on different electron beam energy and have different wavelength range and power of generated radiation. Whole FEL facility is a complex physics installation, controlled by large amount of equipment of different types. Therefore, for effective control and monitor of FEL operation state and its parameters, the particularized control system was developed. In this paper the architecture, hardware, software compound parts of this control system are considered. Also main abilities, characteristics of this system and examples of its usage are presented.
	Poster TUPHA051 [1.380 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA051
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TUPHA058	The Control Systems of SXFEL and DCLS	ion, controls, network, interface	525
	Y.B. Yan, G.H. Chen, J.G. Ding, S.M. Hu, Y.J. Liu, Q.R. Mi, H.F. Miao, C.L. Yu, H. Zhao, H.J. Zhu SSRF, Shanghai, People's Republic of China
	The high-gain free electron lasers (FEL) have given scientists hopes for new scientific discoveries in many frontier research areas. The Shanghai X-Ray Free-Electron Laser (SXFEL) test facility is commissioning at the Shanghai Synchrotron Radiation Facility (SSRF) campus. The Dalian Coherent Light Source (DCLS) has successfully commissioned in the northeast of China, which is the brightest vacuum ultraviolet (VUV) free electron laser facility. The control systems of the two facilities are base on EPICS. The industrial computer, programmable logic controller (PLC) and field programmable gate array (FPGA) are adopt for device control. The archiver is based on the PostgreSQL database. The high-level applications are developed using Python. The details of the control system design, construction and commissioning will be reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA058
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TUPHA125	The Bunch Arrival Time Monitor at FLASH and European XFEL	ion, laser, controls, electron	701
	M. Viti, M.K. Czwalinna, H. Dinter, C. Gerth, K.P. Przygoda, R. Rybaniec, H. Schlarb DESY, Hamburg, Germany
	In modern free electron laser facilities like FLASH I/II and European XFEL at DESY a high resolution intra bunch train arrival time measurement is mandatory, providing a crucial information for the beam based feedback system. For this purpose a Bunch Arrival Time Monitor (BAM) was developed, based on an electro-optical scheme where an ultra-short pulsed laser is employed. A BAM is composed of several subsystems, including stepper motors, power management, dedicated readout board, management board for voltage settings, temperature sensors and temperature controller and optical amplifier. Part of the electronics is developed using the MicroTCA standard. We will present in this poster the basic requirements for the BAM, software design and implementation developed to manage the subsystems and their interactions.
	Poster TUPHA125 [1.356 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA125
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TUPHA210	A Bunch-Synchronized Data Acquisition System for the European XFEL Accelerator	ion, controls, data-acquisition, operation	958
	T. Wilksen, A. Aghababyan, L. Fröhlich, O. Hensler, R. Kammering, K.R. Rehlich, V. Rybnikov DESY, Hamburg, Germany
	The linear, super-conducting accelerator at the new European XFEL facility will be able to produce up to 2700 electron bunches for each shot at a repetition rate of 10 Hz. The bunch repetition rate might vary initially between 100 kHz and 4.5 MHz to accommodate the various needs of experiments at three different SASE beam lines. A solution, which is able to provide bunch-resolved data of multiple data sources together in one place for each shot, has been implemented at the E-XFEL as an integral part of the accelerator control system. This will serve as a framework for high-level control applications, including online monitoring and slow feedback services. A similar system has been successfully run at the FLASH facility at DESY for more than a decade now. This paper presents design, implementation and first experiences from commissioning the XFEL control system data acquisition.
	Poster TUPHA210 [1.421 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUPHA210
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TUSH102	PShell: from SLS beamlines to the SwissFEL control room	ion, interface, controls, GUI	979
	A. Gobbo, S.G. Ebner PSI, Villigen PSI, Switzerland
	PShell is an in-house developed scripting environment in use at PSI since 2014. Started as a beamline data acquisition tool at SLS, PShell is being used by different SwissFEL groups for the commissioning and operation of the SwissFEL machine. New features were added to meet new requirements, such as supporting beam synchronous data and streamed cameras. Besides providing a workbench for developing data acquisition logic, PShell also offers a convenient way to create user interfaces/panels that can easily trigger the execution of logic. To improve user experience and to simplify operation tools these panels can also be launched and used as standalone applications.
	Poster TUSH102 [1.542 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUSH102
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WEAPL07	On-line Optimization of European XFEL with OCELOT	ion, photon, operation, controls	1038
	S.I. Tomin, G. Geloni XFEL. EU, Hamburg, Germany I.V. Agapov, W. Decking, M. Scholz, I. Zagorodnov DESY, Hamburg, Germany
	FEL tuning and optimization within the OCELOT framework has been implemented in 2015 and has been since used for SASE pulse energy optimization at FLASH and later at LCLS, as well as injection efficiency maximization in the Siberia-1 storage ring. For the European XFEL commissioning purposes the code was considerably improved and additional set of tools has been introduced. Here these tools and experi-ence of their use during the European XFEL commissioning and initial operation will be presented. Future devel-opment directions will be outlined.
	Talk as video stream: https://youtu.be/b97wcbuve4A
	Slides WEAPL07 [6.338 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-WEAPL07
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THMPA01	The Interlock System of FELiChEM	ion, software, hardware, controls	1298
	Z. Huang, G. Liu, Y. Song USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: National Natural Science Foundation of China(No.11375186, No.21327901) FELiChEM is an infrared free-electron laser user facility under construction at NSRL. The design of the interlock system of FELiChEM is based on EPICS. The interlock system is made up of the hardware interlock system and the software interlock system. The hardware interlock system is constructed with PROFINET and redundancy technology. The software interlock system is designed with an independent configuration file to improve the flexibility. The test results of the prototype system are also described in this paper.
	Slides THMPA01 [1.270 MB]
	Poster THMPA01 [0.881 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THMPA01
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THMPA04	RF-Energy Management for the European XFEL	ion, operation, LLRF, linac	1312
	O. Hensler DESY, Hamburg, Germany
	The European XFEL is in its commissioning phase at this time. One of the major tasks is to bring up all the 25 installed RF-stations, which will allow for beam energy of up to 17.5GeV. It is expected, that a klystron may fail every 1-2 month. The accelerator is designed at the moment with an energy overhead corresponding to 2-3 RF-station, as the last 4 accelerating modules will be installed in a later stage. This will allow recovering the missing energy with the other functioning RF-stations to keep downtime as short as possible in the order of seconds. The concept and corresponding High-Level software accomplishing this task will be presented in this paper.
	Slides THMPA04 [2.129 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THMPA04
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THPHA031	Fast Image Analysis for Beam Profile Measurement at the European XFEL	ion, emittance, electron, ion-effects	1416
	J. Wilgen, B. Beutner DESY, Hamburg, Germany
	At the European XFEL, images of scintillator screens are processed at a rate of 10 Hz. Dedicated image analysis servers are used for transversal beam profile analysis as well as for longitudinal profile and slice emittance measurement. This contribution describes the setup and the algorithms used for image analysis.
	Poster THPHA031 [1.161 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA031
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THPHA044	REALTA and pyDART: A Set of Programs to Perform Real Time Acquisition and On-Line Analysis at the FERMI Free Electron Laser	ion, real-time, controls, GUI	1460
	E. Allaria, E. Ferrari, E. Roussel, L. Vidotto Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	During the optimization phase of the FERMI Free Electron Laser (FEL) to deliver the best FEL pulses to users, many machine parameters have to be carefully tuned, like e.g. the seed laser intensity, the dispersion strength, etc. For that purpose, a new python-based acquisition tool, called REALTA (Real Time Acquisition program), has been developed to acquire various machine parameters, electron beam properties and FEL signals on a shot-by-shot basis thanks to the real time capabilities of the TANGO control system. The data are saved continuously during the acquisition in a HDF5 file. The pyDART (Python Data Analysis Real Time) program is the post-processing tool that enables a fast analysis of the data acquired with REALTA. It allows to study the correlations and dependences between the FEL and electron beam properties and the machine parameters. In this work, we present the REALTA and pyDART toolkit developed for the FERMI FEL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA044
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THPHA063	Status of the CLARA Control System	ion, controls, EPICS, timing	1517
	G. Cox, R.F. Clarke, M.D. Hancock, P.W. Heath, N. Knowles, B.G. Martlew, A. Oates, P.H. Owens, W. Smith, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom S. Kinder DSoFt Solutions Ltd, Warrington, United Kingdom
	STFC Daresbury Laboratory has recently commissioned Phase 1 of CLARA (Compact Linear Accelerator for Research and Applications) [1], a novel FEL (Free Electron Laser) test facility focussed on the generation of ultra-short photon pulses of coherent light with high levels of stability and synchronisation. The main motivation for CLARA is to test new FEL schemes that can later be implemented on existing and future short wavelength FELs. Particular focus will be on ultra-short pulse generation, pulse stability, and synchronisation with external sources. Knowledge gained from the development and operation of CLARA will inform the aims and design of a future UK-XFEL. The control system for CLARA is a distributed control system based upon the EPICS software framework. The control system builds on experience gained from previous EPICS based facilities at Daresbury including ALICE (formerly ERLP) [2] and VELA [3]. This paper presents the current status of the CLARA control system and discusses the systems deployed for Phase 1 and future plans for later phases.
	Poster THPHA063 [2.236 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA063
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THPHA090	Channel Selection Switch for the Redundant 1.3 GHz Master Oscillator of the European XFEL	ion, controls, detector, ISOL	1590
	B. Gąsowski, K. Czuba, L.Z. Zembala Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland H. Schlarb DESY, Hamburg, Germany
	Funding: Research supported by Polish Ministry of Science and Higher Education, founds for international co-financed projects for years 2016 and 2017. The phase reference signal reliability is of utmost importance for continuous operation of the European XFEL machine. Since even very short interruption or glitch in the reference signal might break the precise synchronisation between subsystems, it is desirable to minimize probability of such events. While master oscillators often have a hot-spare to speed-up recovery after a failure, whether switched manually or electronically, it does not save from time-consuming resynchronisation. Our experience from testing and commissioning E-XFEL 1.3 GHz Master Oscillator (MO) shows that a struggle to achieve demanding phase-noise requirements might negatively impact reliability of the system. In this paper we present an approach which allows for quick switching between independent reference generation channels while maintaining continuity of the output signal. This is a first step towards autonomous redundancy solution for the E-XFEL MO which will maintain continuous reference signal even in case of a failure of one of the generation channels.
	Poster THPHA090 [1.155 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA090
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THPHA092	Optimisation of a Low-Noise 1.3 GHz PLL Frequency Synthesizer for the European XFEL	ion, controls, detector, experiment	1595
	S. Hanasz, K. Czuba, B. Gąsowski, L.Z. Zembala Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland H. Schlarb DESY, Hamburg, Germany
	Funding: Research supported by Polish Ministry of Science and Higher Education, founds for international co-financed projects for year 2017. The Master Oscillator system of the European XFEL was built using frequency synthesis techniques that were found to have the best phase noise performance. This includes low noise frequency multipliers and nonÂmultiplying phase lock loops, incorporated in the system to shape its output phase noise spectrum. Jitter of the output signal strongly depends on phase noise transmittance of the PLL and suboptimal design can worsen it by orders of magnitude. Taking into consideration that the PLL open loop transmittance usually can be shaped in multiple ways, and that the accurate phase noise measurements can easily take more than 30 minutes, designing an automated tool becomes a necessity. For this purpose an approach to the tuning system construction was chosen in order to make the phase noise optimisation process simpler. This paper describes the optimisation of PLL synthesizer phase noise, done to improve the performance of the European XFEL MO. We present the phase noise optimisation process and achieved results.
	Poster THPHA092 [1.393 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA092
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THPHA116	Emittance Measurement and Optics Matching at the European XFEL	ion, emittance, optics, quadrupole	1655
	S.M. Meykopff, B. Beutner DESY, Hamburg, Germany
	Electron beam quality described by the emittance or phase space moments are important for the operation of FEL facilities like the European XFEL. For the operation these parameters need to be routinely measured. Based on such measurements machine setup can be optimized to match beam requirements. The beam parameters depend on parameters like quadrupole magnet strength or RF settings. While manual tuning is possible, we aim for highly automatized procedures to obtain such optimizations. In this paper we will present and discuss an overview of the different subsystems which are involved. These include image acquisition, analysis, and optics calculations as well as machine control user interfaces.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA116
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Paper

Title

Other Keywords

Page

MOAPL01

The Control System for the Linear Accelerator at the European XFEL: Status and First Experiences

ion, controls, MMI, photon

1

T. Wilksen, A. Aghababyan, R. Bacher, P.K. Bartkiewicz, C. Behrens, T. Delfs, P. Duval, L. Fröhlich, W. Gerhardt, C. Gindler, O. Hensler, K. Hinsch, J.M. Jäger, R. Kammering, S. Karstensen, H. Kay, H. Kay, V. Kocharyan, A. Labudda, T. Limberg, S.M. Meykopff, A. Petrosyan, G. Petrosyan, L.P. Petrosyan, V. Petrosyan, P. Pototzki, K.R. Rehlich, G. Schlesselmann, E. Sombrowski, M. Staack, J. Szczesny, M. Walla, J. Wilgen, H. Wu
DESY, Hamburg, Germany

The European XFEL (E-XFEL) is a 3.4 km long X-ray Free-Electron Laser facility and consists of a superconducting, linear accelerator with initially three undulator beam lines. The construction and installation of the E-XFEL is being completed this year and commissioning is well underway. First photon beams are expected to be available for early users in the second half of 2017. This paper will focus on the control system parts for the linear accelerator with its more than 7 million parameters and highlight briefly its design and implementation. Namely the hardware framework based on the MicroTCA.4 standard, testing software concepts and components at real and virtual accelerator facilities and a well-established method for integrating high-level controls into the middle layer through a shot-synchronized data acquisition allowed for a rapid deployment and commissioning of the accelerator. Status and experiences from a technical and an operational point-of-view will be presented.

Slides MOAPL01 [6.198 MB]

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MOAPL04

SwissFEL Control System - Overview, Status, and Lessons Learned

ion, controls, network, electron

19

E. Zimoch, A.D. Alarcon, D. Anicic, A.G. Bertrand, R. Biffiger, K. Bitterli, M. Boccioli, H. Brands, P. Bucher, T. Celcer, P. Chevtsov, E.J. Divall, S.G. Ebner, M. Gasche, F. Haemmerli, C.E. Higgs, T. Humar, M. Janousch, G. Janser, G. Jud, B. Kalantari, R. Kapeller, R.A. Krempaská, D.J. Lauk, M.P. Laznovsky, H. Lutz, D. Maier-Manojlovic, F. Märki, V. Ovinnikov, T. Pal, W. Portmann, S.G. Rees, T. Zamofing, C. Zellweger, D. Zimoch
PSI, Villigen PSI, Switzerland

The SwissFEL is a new free electron laser facility at the Paul Scherrer Institute (PSI) in Switzerland. Commissioning started in 2016 and resulted in first lasing in December 2016 (albeit not on the design energy). In 2017, the commissioning continued and will result in the first pilot experiments at the end of the year. The close interaction of experiment and accelerator components as well as the pulsed electron beam required a well thought out integration of the control system including some new concepts and layouts. This paper presents the current status of the control system together with some lessons learned.

Talk as video stream: https://youtu.be/oaGDyYYzKJ4

Slides MOAPL04 [2.258 MB]

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MOCPL06

MARWIN: A Mobile Autonomous Robot for Maintenance and Inspection

ion, radiation, software, laser

76

A. Dehne, T. Hermes, N. Moeller
hs21, Buxtehude, Germany
R. Bacher
DESY, Hamburg, Germany

MARWIN is a mobile autonomous robot platform designed for performing maintenance and inspection tasks alongside the European XFEL accelerator installation in operation in Hamburg, Germany. It consists of a 4-wheel drive chassis and a manipulator arm. Due to the unique Mecanum drive technology in combination with the manipulator arm the whole robot provides three degrees of freedom. MARWIN can be operated in a pre-configured autonomous as well as a remotely controlled mode. Its operation can be supervised through various cameras. The primary use case of MARWIN is measuring radiation fields. For this purpose MARWIN is equipped with both a mobile Geiger-Mueller tube mounted at the tip of the manipulator arm and a stationary multi-purpose radiation detector attached to the robot's chassis. This paper describes the mechanical and electrical setup of the existing prototype, the architecture and implementation of the controls routines, the strategy implemented to handle radiation-triggered malfunctions, and the energy management. In addition, it reports on recent operations experiences, envisaged improvements and further use cases.

Talk as video stream: https://youtu.be/SRnZSWMhgQg

Slides MOCPL06 [27.173 MB]

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TUBPA03

Database Scheme for Unified Operation of SACLA / SPring-8

ion, database, operation, controls

201

K. Okada, N. Hosoda, M. Ishii, T. Sugimoto, M. Yamaga
JASRI/SPring-8, Hyogo-ken, Japan
T. Fujiwara, T. Fukui, T. Maruyama, K. Watanabe
RIKEN SPring-8 Center, Hyogo, Japan
H. Sumitomo
SES, Hyogo-pref., Japan

For reliable accelerator operation, it is essential to have a centralized data handling scheme, for such as unique equipment ID's, archive and online data from sensors, and operation points and calibration parameters those are to be restored upon a change in operation mode. Since 1996, when SPring-8 got in operation, a database system has been utilized for this role. However, as time passes the original design got shorthanded and new features equipped upon requests pushed up maintenance costs. For example, as SACLA started in 2010, we introduced a new data format for the shot by shot synchronized data. Also number of tables storing operation points and calibrations increased with various formats. Facing onto the upgrade project at the site*, it is the time to overhaul the whole scheme. In the plan, SACLA will be the high quality injector to a new storage ring while in operation as the XFEL user machine. To handle shot by shot multiple operation patterns, we plan to introduce a new scheme where multiple tables inherits a common parent table information. In this paper, we report the database design for the upgrade project and status of transition.
* http://rsc.riken.jp/pdf/SPring-8-II.pdf

Slides TUBPA03 [0.950 MB]

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TUCPL04

SwissFEL Timing System: First Operational Experience

ion, timing, controls, software

232

B. Kalantari, R. Biffiger
PSI, Villigen PSI, Switzerland

The SwissFEL timing system builds on MRF's event system products. Performance and functional requirements have pushed MRF timing components to its newest generation (300 series) providing active delay compensation, conditional sequence events, and topology identification among others. However, employing available hardware functionalities to implement complex and varying operational demands and provide them in the control system has its own challenges. After a brief introduction to the new MRF hardware this paper describes operational aspects of the SwissFEL timing and related control system applications. We describe a new technique for beam rate control and how this scheme is used for the machine protection system (MPS). We show how a well thought modular software-side design enables us to maintain various rep rates across the facility and allows us to implement complex triggering patterns with minimum development effort. We also discuss our timestamping method and its interface to the beam synchronous data acquisition system. Further we share our experience in timing network installation, monitoring and maintenance issues during commissioning phase of the facility.

Talk as video stream: https://youtu.be/CWx8QBpSxXc

Slides TUCPL04 [5.381 MB]

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TUCPA01

Data Analysis Support in Karabo at European XFEL

ion, data-analysis, experiment, controls

245

H. Fangohr, M. Beg, V. Bondar, D. Boukhelef, S. Brockhauser, C. Danilevski, W. Ehsan, S.G. Esenov, G. Flucke, G. Giovanetti, D. Goeries, S. Hauf, B.C. Heisen, D.G. Hickin, D. Khakhulin, A. Klimovskaia, M. Kuster, P.M. Lang, L.G. Maia, L. Mekinda, T. Michelat, A. Parenti, G. Previtali, H. Santos, A. Silenzi, J. Sztuk-Dambietz, J. Szuba, M. Teichmann, K. Weger, J. Wiggins, K. Wrona, C. Xu
XFEL. EU, Schenefeld, Germany
S. Aplin, A. Barty, M. Kuhn, V. Mariani
CFEL, Hamburg, Germany
T. Kluyver
University of Southampton, Southampton, United Kingdom

We describe the data analysis structure that is integrated into the Karabo framework [1] to support scientific experiments and data analysis at European XFEL GmbH. The photon science experiments have a range of data analysis requirements, including online (i.e. near real-time during the actual measurement) and offline data analysis. The Karabo data analysis framework supports execution of automatic data analysis for routine tasks, supports complex experiment protocols including data analysis feedback integration to instrument control, and supports integration of external applications. The online data analysis is carried out using distributed and accelerator hardware (such as GPUs) where required to balance load and achieve near real-time data analysis throughput. Analysis routines provided by Karabo are implemented in C++ and Python, and make use of established scientific libraries. The XFEL control and analysis software team collaborates with users to integrate experiment specific analysis codes, protocols and requirements into this framework, and to make it available for the experiments and subsequent offline data analysis.
[1] Heisen et al (2013) "Karabo: An Integrated Software Framework Combining Control, Data Management, and Scientific Computing Tasks". Proc. of 14th ICALEPCS 2013, Melbourne, Australia (p. FRCOAAB02)

Slides TUCPA01 [10.507 MB]

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TUCPA06

SwissFEL - Beam Synchronous Data Acquisition - The First Year

ion, data-acquisition, MMI, real-time

276

S.G. Ebner, H. Brands, B. Kalantari, R. Kapeller, F. Märki, L. Sala, C. Zellweger
PSI, Villigen PSI, Switzerland

The SwissFEL beam-synchronous data-acquisition system is based on several novel concepts and technologies. It is targeted on immediate data availability and online processing and is capable of assembling an overall data view of the whole machine, thanks to its distributed and scalable back-end. Load on data sources is reduced by immediately streaming data as soon as it becomes available. The streaming technology used provides load balancing and fail-over by design. Data channels from various sources can be efficiently aggregated and combined into new data streams for immediate online monitoring, data analysis and processing. The system is dynamically configurable, various acquisition frequencies can be enabled, and data can be kept for a defined time window. All data is available and accessible enabling advanced pattern detection and correlation during acquisition time. Accessing the data in a code-agnostic way is also possible through the same REST API that is used by the web-frontend. We will give an overview of the design and specialities of the system as well as talk about the findings and problems we faced during machine commissioning.

Slides TUCPA06 [5.107 MB]

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TUMPA06

RF Heat Load Compensation for the European XFEL

ion, operation, controls, cavity

348

M.R. Clausen, T. Boeckmann, J. Branlard, J. Eschke, O. Korth, J. Penning, B. Schoeneburg
DESY, Hamburg, Germany

The European XFEL is a 3.4km long X-ray Free Electron Laser. The accelerating structure consists of 96 cryo modules running at 1.3 GHz with 10 Hz repetition rate. The injector adds two modules running at 1.3 and 3.9 GHz respectively. The cryo modules are operated at 2 Kelvin. Cold compressors (CCs) pump down the liquid Helium to 30 mbar which corresponds to 2 Kelvin. Stable conditions in the cryogenic system are mandatory for successful accelerator operations. Pressure fluctuations at 2 K may cause detuning of cavities and could result in unstable CC operations. The RF losses in the cavities may be compensated by reducing the heater power in the liquid Helium baths of the nine cryogenic strings. This requires a stable readout of the current RF settings. The detailed signals are read out from several severs in the accelerator control system and then computed in the cryogenic control system for heater compensation. This paper will describe the commissioning of the cryogenic control system, the communication between the control systems involved and first results of machine operations with the heat loss compensation in place.

Slides TUMPA06 [0.682 MB]

Poster TUMPA06 [0.635 MB]

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TUMPA07

Advances in Automatic Performance Optimization at FERMI

ion, laser, electron, experiment

352

G. Gaio, N. Bruchon, M. Lonza
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
L. Saule
University of Trieste, Trieste, Italy

Despite the large number of feedback loops running simultaneously at the FERMI Free Electron Laser (FEL), they are not sufficient to keep the optimal machine working point in the long term, in particular when the machine is tuned in such a way to be more sensitive to drifts of the critical parameters. In order to guarantee the best machine performance, a novel software application which minimizes the shot to shot correlation between these critical parameters and the FEL radiation has been implemented. This application, which keeps spatially and temporally aligned the seed laser and the electron beam, contrary to many algorithms that inject noise in the system to be optimized, run transparently during the experiment beam times. In this paper we will also present a newly developed method to calculate a beam 'quality factor' starting from the images provided by a photon spectrometer, which tries to mimic the evaluation of machine physicists, as well as the results obtained using two model-less algorithms to optimize the FEL performance through maximization of the quality factor.

Slides TUMPA07 [0.846 MB]

Poster TUMPA07 [1.124 MB]

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TUPHA039

Bunch Arrival Time Monitor Control Setup for SwissFEL Applications

ion, controls, software, data-acquisition

469

P. Chevtsov, V.R. Arsov
PSI, Villigen PSI, Switzerland
M. Dach
Dach Consulting GmbH, Brugg, Switzerland

Bunch Arrival time Monitor (BAM) is a precise beam diagnostics instrument assessing the accelerator stability on-line. It is one of the most important components of the SwissFEL facility at the Paul Scherrer Institute (PSI). The overall monitor complexity demands the development of an extremely reliable control system that handles basic BAM operations. A prototype of such a system was created at PSI. The system is very flexible. It provides a set of tools allowing one to implement a number of advanced control features such as tagging experimental data with a SwissFEL machine pulse number or embedding high level control applications into the process controllers (IOC). The paper presents the structure of the BAM control setup. The operational experience with this setup is also discussed.

Poster TUPHA039 [1.027 MB]

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TUPHA051

The Control System of Novosibirsk Free Electron Laser

ion, controls, electron, operation

513

V.R. Kozak, E.A. Kuper, T.V. Salikova, P.A. Selivanov, S.S. Serednyakov, S.V. Tararyshkin, A.G. Tribendis, N.A. Vinokurov
BINP SB RAS, Novosibirsk, Russia

Novosibirsk Free electron Laser (FEL) based on multi-turn energy recovery linac is the source of coherent radiation with ability of wavelength tuning. It involves one single-turn and one 4-turn microtron-recuperator, which are have general injection channel and acceleration section. There are three different free electron lasers, mounted on different tracks of these accelerators, and operating on different electron beam energy and have different wavelength range and power of generated radiation. Whole FEL facility is a complex physics installation, controlled by large amount of equipment of different types. Therefore, for effective control and monitor of FEL operation state and its parameters, the particularized control system was developed. In this paper the architecture, hardware, software compound parts of this control system are considered. Also main abilities, characteristics of this system and examples of its usage are presented.

Poster TUPHA051 [1.380 MB]

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TUPHA058

The Control Systems of SXFEL and DCLS

ion, controls, network, interface

525

Y.B. Yan, G.H. Chen, J.G. Ding, S.M. Hu, Y.J. Liu, Q.R. Mi, H.F. Miao, C.L. Yu, H. Zhao, H.J. Zhu
SSRF, Shanghai, People's Republic of China

The high-gain free electron lasers (FEL) have given scientists hopes for new scientific discoveries in many frontier research areas. The Shanghai X-Ray Free-Electron Laser (SXFEL) test facility is commissioning at the Shanghai Synchrotron Radiation Facility (SSRF) campus. The Dalian Coherent Light Source (DCLS) has successfully commissioned in the northeast of China, which is the brightest vacuum ultraviolet (VUV) free electron laser facility. The control systems of the two facilities are base on EPICS. The industrial computer, programmable logic controller (PLC) and field programmable gate array (FPGA) are adopt for device control. The archiver is based on the PostgreSQL database. The high-level applications are developed using Python. The details of the control system design, construction and commissioning will be reported in this paper.

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TUPHA125

The Bunch Arrival Time Monitor at FLASH and European XFEL

ion, laser, controls, electron

701

M. Viti, M.K. Czwalinna, H. Dinter, C. Gerth, K.P. Przygoda, R. Rybaniec, H. Schlarb
DESY, Hamburg, Germany

In modern free electron laser facilities like FLASH I/II and European XFEL at DESY a high resolution intra bunch train arrival time measurement is mandatory, providing a crucial information for the beam based feedback system. For this purpose a Bunch Arrival Time Monitor (BAM) was developed, based on an electro-optical scheme where an ultra-short pulsed laser is employed. A BAM is composed of several subsystems, including stepper motors, power management, dedicated readout board, management board for voltage settings, temperature sensors and temperature controller and optical amplifier. Part of the electronics is developed using the MicroTCA standard. We will present in this poster the basic requirements for the BAM, software design and implementation developed to manage the subsystems and their interactions.

Poster TUPHA125 [1.356 MB]

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TUPHA210

A Bunch-Synchronized Data Acquisition System for the European XFEL Accelerator

ion, controls, data-acquisition, operation

958

T. Wilksen, A. Aghababyan, L. Fröhlich, O. Hensler, R. Kammering, K.R. Rehlich, V. Rybnikov
DESY, Hamburg, Germany

The linear, super-conducting accelerator at the new European XFEL facility will be able to produce up to 2700 electron bunches for each shot at a repetition rate of 10 Hz. The bunch repetition rate might vary initially between 100 kHz and 4.5 MHz to accommodate the various needs of experiments at three different SASE beam lines. A solution, which is able to provide bunch-resolved data of multiple data sources together in one place for each shot, has been implemented at the E-XFEL as an integral part of the accelerator control system. This will serve as a framework for high-level control applications, including online monitoring and slow feedback services. A similar system has been successfully run at the FLASH facility at DESY for more than a decade now. This paper presents design, implementation and first experiences from commissioning the XFEL control system data acquisition.

Poster TUPHA210 [1.421 MB]

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TUSH102

PShell: from SLS beamlines to the SwissFEL control room

ion, interface, controls, GUI

979

A. Gobbo, S.G. Ebner
PSI, Villigen PSI, Switzerland

PShell is an in-house developed scripting environment in use at PSI since 2014. Started as a beamline data acquisition tool at SLS, PShell is being used by different SwissFEL groups for the commissioning and operation of the SwissFEL machine. New features were added to meet new requirements, such as supporting beam synchronous data and streamed cameras. Besides providing a workbench for developing data acquisition logic, PShell also offers a convenient way to create user interfaces/panels that can easily trigger the execution of logic. To improve user experience and to simplify operation tools these panels can also be launched and used as standalone applications.

Poster TUSH102 [1.542 MB]

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WEAPL07

On-line Optimization of European XFEL with OCELOT

ion, photon, operation, controls

1038

S.I. Tomin, G. Geloni
XFEL. EU, Hamburg, Germany
I.V. Agapov, W. Decking, M. Scholz, I. Zagorodnov
DESY, Hamburg, Germany

FEL tuning and optimization within the OCELOT framework has been implemented in 2015 and has been since used for SASE pulse energy optimization at FLASH and later at LCLS, as well as injection efficiency maximization in the Siberia-1 storage ring. For the European XFEL commissioning purposes the code was considerably improved and additional set of tools has been introduced. Here these tools and experi-ence of their use during the European XFEL commissioning and initial operation will be presented. Future devel-opment directions will be outlined.

Talk as video stream: https://youtu.be/b97wcbuve4A

Slides WEAPL07 [6.338 MB]

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THMPA01

The Interlock System of FELiChEM

ion, software, hardware, controls

1298

Z. Huang, G. Liu, Y. Song
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: National Natural Science Foundation of China(No.11375186, No.21327901)
FELiChEM is an infrared free-electron laser user facility under construction at NSRL. The design of the interlock system of FELiChEM is based on EPICS. The interlock system is made up of the hardware interlock system and the software interlock system. The hardware interlock system is constructed with PROFINET and redundancy technology. The software interlock system is designed with an independent configuration file to improve the flexibility. The test results of the prototype system are also described in this paper.

Slides THMPA01 [1.270 MB]

Poster THMPA01 [0.881 MB]

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THMPA04

RF-Energy Management for the European XFEL

ion, operation, LLRF, linac

1312

O. Hensler
DESY, Hamburg, Germany

The European XFEL is in its commissioning phase at this time. One of the major tasks is to bring up all the 25 installed RF-stations, which will allow for beam energy of up to 17.5GeV. It is expected, that a klystron may fail every 1-2 month. The accelerator is designed at the moment with an energy overhead corresponding to 2-3 RF-station, as the last 4 accelerating modules will be installed in a later stage. This will allow recovering the missing energy with the other functioning RF-stations to keep downtime as short as possible in the order of seconds. The concept and corresponding High-Level software accomplishing this task will be presented in this paper.

Slides THMPA04 [2.129 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THMPA04

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THPHA031

Fast Image Analysis for Beam Profile Measurement at the European XFEL

ion, emittance, electron, ion-effects

1416

J. Wilgen, B. Beutner
DESY, Hamburg, Germany

At the European XFEL, images of scintillator screens are processed at a rate of 10 Hz. Dedicated image analysis servers are used for transversal beam profile analysis as well as for longitudinal profile and slice emittance measurement. This contribution describes the setup and the algorithms used for image analysis.

Poster THPHA031 [1.161 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA031

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THPHA044

REALTA and pyDART: A Set of Programs to Perform Real Time Acquisition and On-Line Analysis at the FERMI Free Electron Laser

ion, real-time, controls, GUI

1460

E. Allaria, E. Ferrari, E. Roussel, L. Vidotto
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

During the optimization phase of the FERMI Free Electron Laser (FEL) to deliver the best FEL pulses to users, many machine parameters have to be carefully tuned, like e.g. the seed laser intensity, the dispersion strength, etc. For that purpose, a new python-based acquisition tool, called REALTA (Real Time Acquisition program), has been developed to acquire various machine parameters, electron beam properties and FEL signals on a shot-by-shot basis thanks to the real time capabilities of the TANGO control system. The data are saved continuously during the acquisition in a HDF5 file. The pyDART (Python Data Analysis Real Time) program is the post-processing tool that enables a fast analysis of the data acquired with REALTA. It allows to study the correlations and dependences between the FEL and electron beam properties and the machine parameters. In this work, we present the REALTA and pyDART toolkit developed for the FERMI FEL.

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA044

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THPHA063

Status of the CLARA Control System

ion, controls, EPICS, timing

1517

G. Cox, R.F. Clarke, M.D. Hancock, P.W. Heath, N. Knowles, B.G. Martlew, A. Oates, P.H. Owens, W. Smith, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
S. Kinder
DSoFt Solutions Ltd, Warrington, United Kingdom

STFC Daresbury Laboratory has recently commissioned Phase 1 of CLARA (Compact Linear Accelerator for Research and Applications) [1], a novel FEL (Free Electron Laser) test facility focussed on the generation of ultra-short photon pulses of coherent light with high levels of stability and synchronisation. The main motivation for CLARA is to test new FEL schemes that can later be implemented on existing and future short wavelength FELs. Particular focus will be on ultra-short pulse generation, pulse stability, and synchronisation with external sources. Knowledge gained from the development and operation of CLARA will inform the aims and design of a future UK-XFEL. The control system for CLARA is a distributed control system based upon the EPICS software framework. The control system builds on experience gained from previous EPICS based facilities at Daresbury including ALICE (formerly ERLP) [2] and VELA [3]. This paper presents the current status of the CLARA control system and discusses the systems deployed for Phase 1 and future plans for later phases.

Poster THPHA063 [2.236 MB]

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THPHA090

Channel Selection Switch for the Redundant 1.3 GHz Master Oscillator of the European XFEL

ion, controls, detector, ISOL

1590

B. Gąsowski, K. Czuba, L.Z. Zembala
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
H. Schlarb
DESY, Hamburg, Germany

Funding: Research supported by Polish Ministry of Science and Higher Education, founds for international co-financed projects for years 2016 and 2017.
The phase reference signal reliability is of utmost importance for continuous operation of the European XFEL machine. Since even very short interruption or glitch in the reference signal might break the precise synchronisation between subsystems, it is desirable to minimize probability of such events. While master oscillators often have a hot-spare to speed-up recovery after a failure, whether switched manually or electronically, it does not save from time-consuming resynchronisation. Our experience from testing and commissioning E-XFEL 1.3 GHz Master Oscillator (MO) shows that a struggle to achieve demanding phase-noise requirements might negatively impact reliability of the system. In this paper we present an approach which allows for quick switching between independent reference generation channels while maintaining continuity of the output signal. This is a first step towards autonomous redundancy solution for the E-XFEL MO which will maintain continuous reference signal even in case of a failure of one of the generation channels.

Poster THPHA090 [1.155 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA090

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THPHA092

Optimisation of a Low-Noise 1.3 GHz PLL Frequency Synthesizer for the European XFEL

ion, controls, detector, experiment

1595

S. Hanasz, K. Czuba, B. Gąsowski, L.Z. Zembala
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
H. Schlarb
DESY, Hamburg, Germany

Funding: Research supported by Polish Ministry of Science and Higher Education, founds for international co-financed projects for year 2017.
The Master Oscillator system of the European XFEL was built using frequency synthesis techniques that were found to have the best phase noise performance. This includes low noise frequency multipliers and nonÂmultiplying phase lock loops, incorporated in the system to shape its output phase noise spectrum. Jitter of the output signal strongly depends on phase noise transmittance of the PLL and suboptimal design can worsen it by orders of magnitude. Taking into consideration that the PLL open loop transmittance usually can be shaped in multiple ways, and that the accurate phase noise measurements can easily take more than 30 minutes, designing an automated tool becomes a necessity. For this purpose an approach to the tuning system construction was chosen in order to make the phase noise optimisation process simpler. This paper describes the optimisation of PLL synthesizer phase noise, done to improve the performance of the European XFEL MO. We present the phase noise optimisation process and achieved results.

Poster THPHA092 [1.393 MB]

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THPHA116

Emittance Measurement and Optics Matching at the European XFEL

ion, emittance, optics, quadrupole

1655

S.M. Meykopff, B. Beutner
DESY, Hamburg, Germany

Electron beam quality described by the emittance or phase space moments are important for the operation of FEL facilities like the European XFEL. For the operation these parameters need to be routinely measured. Based on such measurements machine setup can be optimized to match beam requirements. The beam parameters depend on parameters like quadrupole magnet strength or RF settings. While manual tuning is possible, we aim for highly automatized procedures to obtain such optimizations. In this paper we will present and discuss an overview of the different subsystems which are involved. These include image acquisition, analysis, and optics calculations as well as machine control user interfaces.

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