IPAC2017 - Classification: 06 Beam Instrumentation, Controls, Feedback and Operational Aspects / T33 Online Modelling and Software Tools

Paper	Title	Page
THXA1	Beam-Based Optimization of Storage Ring Nonlinear Beam Dynamics	3627
	X. Huang, J.A. Safranek SLAC, Menlo Park, California, USA
	Funding: Work supported in part by the U.S. Department of Energy under contract number DE-AC02-76SF00515. This paper will present considerations and algorithms for direct online optimization of the nonlinear beam dynamics of existing and future storage rings. The experimental setup and results from using this approach to improve the dynamic aperture of the SPEAR3 storage ring, using the robust conjugate direction search method and the particle swarm optimization method, will be covered.
	Slides THXA1 [1.589 MB]
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THPAB072	Application of Voronoi Diagram to Mask-Based Intercepting Phase-Space Measurements	3872
	A. Halavanau, P. Piot Northern Illinois University, DeKalb, Illinois, USA Q. Gao, J.G. Power, E.E. Wisniewski ANL, Argonne, Illinois, USA Q. Gao TUB, Beijing, People's Republic of China G. Ha POSTECH, Pohang, Kyungbuk, Republic of Korea P. Piot Fermilab, Batavia, Illinois, USA
	Intercepting multi-aperture masks (e.g. pepper pot or multislit mask) combined with a downstream transverse-density diagnostics (e.g. based on optical transition radiation or employing scintillating media) are commonly used for characterizing the phase space of charged particle beams and the associated emittances. The required data analysis relies on precise calculation of the RMS sizes and positions of the beamlets originated from the mask which drifted up to the analyzing diagnostics. Voronoi diagram is an efficient method for splitting a plane into subsets according to the distances between given vortices. The application of the method to analyze data from pepper pot and multislit mask based measurement is validated via numerical simulation and applied to experimental data acquired at the Argonne Wakefield Accelerator facility. We also discuss the application of the Voronoi diagrams to quantify transversely-modulated beams distortion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB072
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THPAB092	Orbit and Dispersion Tool at European XFEL Injector	3932
SUSPSIK088	use link to see paper's listing under its alternate paper code
	N. Ghazaryan CANDLE SRI, Yerevan, Armenia M.E. Castro Carballo, W. Decking DESY, Hamburg, Germany
	Trajectory and electron beam size play an essential role in Free Electron Laser (FEL) obtainment. Since transverse dispersion changes off-energy particle trajectories and increases the effective beam size, dispersion and orbit must constantly be controlled and corrected along the whole lattice. In this paper the principles underlying the orbit and dispersion correction tool, developed at DESY, are described. The results of its testing on European XFEL injector are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB092
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THPAB096	Automatized Optimization of Beam Lines Using Evolutionary Algorithms	3941
	S. Appel, V. Chetvertkova, W. Geithner, F. Herfurth, U. Krause, S. Reimann, M. Sapinski, P. Schütt GSI, Darmstadt, Germany D. Österle KIT, Karlsruhe, Germany
	Due to the massive parallel operation modes at GSI accelerators, a lot of accelerator setup and re-adjustment has to be made by operators during a beam time. This is typically done manually using potentiometers and is very time-consuming. With the FAIR project the complexity of the accelerator facility increases further and for efficiency reasons it is recommended to establish a high level of automation for future operation. Modern Accelerator Control Systems allow a fast access to both, accelerator settings and beam diagnostics data. This provides the opportunity to implement algorithms for automated adjustment of e.g. magnet settings to maximize transmission and optimize required beam parameters. The fast-switching magnets in GSI-beamlines are an optimal basis for an automatic exploration of the parameter-space. The optimization of the parameters for the SIS18 multi-turn-injection using a genetic algorithm has already been simulated. The first results of our automatized online parameter optimization at the CRYRING@ESR injector are presented here. [] S. Appel, O. Boine-Frankenheim: Optimization of Multi-turn Injection into a Heavy-Ion Synchrotron using Genetic Algorithms, Proceedings of IPAC2015, Richmond, USA (2015)
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THPAB104	Engineering Documentation and Asset Management for the European XFEL Accelerator	3960
	L. Hagge, J.A. Dammann, T.T. Hongisto, J. Kreutzkamp, D. Käfer, B. List, S. Rohwedder, S. Sühl, N. Welle DESY, Hamburg, Germany A. Frank European XFEL, Schenefeld, Germany
	At the European XFEL, extensive technical documentation has been created during design and construction of the accelerator. It is based on a configuration database (the DESY EDMS), which provides an inventory of major accelerator systems. The configuration database registers components and their used materials, tracks component design and fabrication history, and contains engineering documents and drawings, and work and inspection records. Technical documentation can be accessed through intuitive reports and navigational tree structures, representing specific beamline sections or areas of the facility. Access on mobile devices in the accelerator tunnel is supported by component tags with QR codes. A dedicated front-end has been developed for automatically uploading and cross-linking documents to the configuration database, reducing documentation efforts in the project teams. The configuration database now serves as a foundation for upcoming technical operation and maintenance activities. The paper provides an overview of the available engineering documentation and its access methods, and discusses its expected role and benefits in future maintenance processes.
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THPAB121	The Study of Accelerator Data Archiving and Retrieving Software	4007
SUSPSIK089	use link to see paper's listing under its alternate paper code
	Y.S. Qiao, G. Lei, Z. Zhao IHEP, Beijing, People's Republic of China
	This paper presents a novel archiving and retrieving software designed for BEPC-II and other particle accelerators. At BEPC-II, real-time data are stored as index files recorded by traditional EPICS Channel Archiver. Never-theless, index files are not suitable for long-term maintenance and difficult for data analysis. The NoSQL database MongoDB is used for this new system due to aging technologies, so as to promote the data storage reliability, usability, and possible future advanced data analysis. A cross-platform UI (User Interface) has also been developed to make it quicker and easier to access the database. The writing and query performance are tested for this software.
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THPAB122	Open XAL Development for Xi'an Proton Application Facility	4010
	Y. Yang, X. Guan, Y. Lei, W. Wang, X.W. Wang, S.X. Zheng TUB, Beijing, People's Republic of China M.C. Wang, Z.M. Wang, H.Z. Zhang State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
	Beam commission tools for Xi'an Proton Application Facility (XiPAF) will be developed based on Open XAL. In this paper, we present preparations made for adopting Open XAL in XiPAF, including a newly designed database schema based on MySQL, modifying db2xal application based on database schema to create optics file automatically. We also add time-dependent nodes in XiPAF's online model to meet the need of energy ramping in synchrotron. A set of high-level applications as well as a new virtual accelerator is under development.
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THPAB136	Kameleon - a Behavior-Rich, Non-Memoryless and Time-Aware Generic Simulator	4040
	R.N. Fernandes ESS, Lund, Sweden N. Senaud CEA/DRF/IRFU, Gif-sur-Yvette, France
	At ESS, thousands of devices will be used to control both the machine and end-station instruments. To enable ongoing development when access to these devices is not possible (for whatever the reason), Kameleon was implemented. It is a behavior-rich, non-memoryless and time-aware generic simulator that handles clients through a TCP/IP connection. An instance of this client is an EPICS IOC or a Tango Device Server. Kameleon consumes a user-defined file that describes the commands received from a client and, optionally, the reaction to these through statuses sent back to the client. Key features are: 1) Ubiquitous (runs in disparate platforms such as Windows and Linux). 2) Behavior-rich (predefined behaviors as well as user-defined). 3) Non-memoryless (the state of the simulation can be preserved between events and/or elapsed time). 4) Time-aware (statuses can be sent to the client either event-based or time-based). 5) Flexible (commands and statuses are described in a simple user-defined file - nothing is hard-coded in Kameleon). Kameleon will be used in a myriad of scenarios at ESS such as development of EPICS devices support, IOCs, OPI screens, testing of IOCs and alarm workflows.
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THPAB137	New Approach in Developing Open XAL Applications	4043
	C. Rosati, E. Laface ESS, Lund, Sweden
	Open XAL project is a pure-Java open source development environment used for creating accelerator physics applications, scripts and services. Working with Open XAL requires developing a Java application with a prominent graphical user interface, allowing the final user to interact with the accelerator model, and to graphically view the results such interaction produced. Nevertheless the Open XAL support for specialized components (handling plotting, EPICS connection) and for a document-view application framework, relieving the developer of the burden related with this programming aspects, a lot of boilerplate code has still to be created, making the developer spending more time in UI than in accelerator physics code. In this paper a new approach in developing Open XAL applications is explained. Here the developer is relieved of the UI-related common code code by using software tools, allowing him to visually design the flow of data and events between the various elements of the applications (widgets and models), and automatically generate the application code, where code generation can be customized to use one of the available plugged programming languages (Java, Python, JS, …).
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THPAB140	MAX IV Online Linac Model	4047
	L. Isaksson, E. Mansten, S. Thorin MAX IV Laboratory, Lund University, Lund, Sweden
	An online linac model has been developed at MAX IV in order to enable a calculation of the properties of the linac beam based on the actual settings of the magnetic elements. The model is based on the Elegant simulation code and uses the design linac lattice file. A set of Matlab scripts fetch the actual settings of all elements via the Tango control system, pass these values on to Elegant and run the simulation. The model includes an optimization option for yielding desired beta- and alpha-function values at various points along the linac by calculating optimal settings for chosen elements.
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THPAB145	CERN Accelerators Topology Configuration: Facing the Next Long Shutdown	4066
	S. Bartolome-Jimenez, T.W. Birtwistle, S. Chemli, N. Gilbert, A.-L. Perrot, J. Piar, V. Simetka, B. Vazquez de Prada Planas CERN, Geneva, Switzerland
	The Configuration and Layout (CL) team at CERN ensures that there is a clear and coherent representation of the status of the CERN underground facilities (about 60 km of equipment) and main accelerator projects at a given point in time. In view of the major equipment changes to be carried out during the extended end of year technical stop (EYETS), the next Long Shutdown (LS2), and to facilitate the associated preparatory work of multiple CERN groups, the CL team has developed an immersive visualisation tool, displaying 360 degree panoramic images of CERN underground facilities. In addition, the CL team is launching a process to manage future layout configurations inside the CERN Layout database in parallel to the current configuration. This paper presents the 360 degree panorama visualisation tool and the parallel configuration process, to view the past, current and future status of the CERN accelerator complex. It highlights their added value for the CERN groups in the preparatory phase for upgrade and consolidation modifications and discusses the potential future improvements.
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THPAB146	Investigation of the Remanent Field of the SPS Main Dipoles and Possible Solutions for Machine Operation	4069
	F.M. Velotti, H. Bartosik, J. Bauche, M.C.L. Buzio, K. Cornelis, M.A. Fraser, V. Kain CERN, Geneva, Switzerland
	The CERN Super Proton Synchrotron (SPS) provides different types of beams at different extraction energies. The main magnets of the SPS are regulated with a current loop, but it has turned out that hysteresis effects from the main dipoles have a significant impact on reproducibility and hence efficiency and availability. Beam and machine parameters were found to depend on the programmed sequence of magnetic cycles - the so-called super cycle - representing the production of the different beams. The scientific program of the SPS requires frequent changes of the supercycle composition and the effect of the main magnet hysteresis has to be understood, modelled and used in accelerator control system. This paper summarises the first main field measurements carried out with the currently available systems during operational conditions as well as measurements of vital machine and beam parameters as a function of the super cycle composition. Finally, ideas will be presented to provide reproducibility by automatically correcting different parameters taking the magnetic history of the main magnets into account.
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THPAB147	Automatic Local Aperture Measurements in the SPS	4073
	V. Kain, H. Bartosik, S. Cettour Cave, K. Cornelis, F.M. Velotti CERN, Geneva, Switzerland
	The CERN SPS (Super Proton Synchrotron) serves as LHC injector and provides beam for the North Area fixed target experiments. It is equipped with flat vacuum chambers to accommodate the large horizontal beam size required during transition crossing and slow extraction. At low energy, the vertical acceptance becomes critical with high intensity large emittance fixed target beams. Optimizing the vertical available aperture is a key ingredient to optimize transmission and reduce activation around the ring. Aperture measurements are routinely carried out after each shutdown. Global vertical aperture measurements are followed by detailed bump scans at the locations with the loss peaks. During the 2016 run a tool was developed to provide an automated local aperture scan around the entire ring. This allowed to establish detailed reference measurements of the vertical aperture and identify directly the SPS aperture bottlenecks. The methodology applied for the scans will be briefly described in this paper and the analysis discussed. Finally, the 2016 SPS measured vertical aperture will be presented and compared to the results obtained with the previous method.
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THPAB149	Characterization of the THz Radiation-Based Bunch Length Measurement System for the NSRRC Photoinjector	4080
	C.C. Liang, B.Y. Chen, C.H. Chen, M.C. Chou, S. Fann, C.S. Huang, N.Y. Huang, J.-Y. Hwang, W.K. Lau, A.P. Lee, T.Y. Lee, W.Y. Lin, T.-C. Yu NSRRC, Hsinchu, Taiwan
	A part of high brightness photo-injection (HBI) project at NSRRC is intending to adopt Coherent Transition Radiation (CTR) and Coherent Undulator Radiation (CUR) to generate THz radiation with an ultrashort electron bunch. Such high intensity THz sources allow the THz spectrum to be conducted easily with a THz interferometer and a Golay cell detector. Furthermore, the radiation spectrum carries information of the electron distribution which allows ultrashort electron bunch length measurements. For verifying correct measuring procedure during the CTR and CUR experiments, a conventional THz radiation generated by optical rectification from a ZnTe crystal has been performed. The produced THz pulse was sent into a Michelson interferometer which is designed for the autocorrelation of the intense, sub-mm and mm-wavelength, spatially-coherent radiation pulses. The THz spectrum can be further obtained from the interferogram by the Fourier transform process. In such way, the THz spectrum can be investigated if the result is satisfactory and can be applied on the THz CTR and CUR experiments for the next step.
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THPAB151	Online Optimisation Applications at SPS	4086
	T. Pulampong, P. Klysubun, S. Kongtawong, S. Krainara, P. Sudmuang SLRI, Nakhon Ratchasima, Thailand
	Optimisation of a particle accelerator with very limited diagnostic system is proved to be very challenging and complicated. Theoretical calculation and perfect machine model never guarantee the best solution in the actual machine. In this work, optimisation of injection system from Low energy Beam Transport line (LBT) to Siam Photon Source (SPS) storage ring and reduction of beam coupling employing Robust Conjugate Direction Search (RCDS) algorithm are demonstrated. New record improvement on injection efficiency and better coupling control will be presented.
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THPAB153	An Online Multi-Objective Optimisation Package	4092
	I.P.S. Martin, M. Apollonio, R. Bartolini, M.J. Furseman DLS, Oxfordshire, United Kingdom R. Bartolini, G.A. Bird JAI, Oxford, United Kingdom D.R. Obee Durham University, Durham, United Kingdom
	The overall performance of an electron storage ring is critically dependant on a large number of variables. It can be characterised in many ways, such as by lifetime, injection efficiency, beam stability and so on. It is frequently the case however that improving one parameter comes at the cost of harming another. Equally, given the large number of variables involved in optimising the ring performance, the true, global optimum solution may be difficult to identify using simple parameter scans. In order to address this problem, a flexible optimisation tool has been developed. This tool is capable of optimising several parameters at once and can cope with an arbitrary number of variables (individually or in families). The tool is designed to be robust to measurement noise, and has been applied to a number of different optimisation problems. This paper presents an overview of the package, as well as the results of the first tests.
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THPIK064	Beam Lifetime Analysis of HLS-II Storage Ring	4242
	K. Xuan, C. Li, J.Y. Li, G. Liu, G. Liu, J.G. Wang, L. Wang, W. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Beam lifetime is one of the important parameters of electron storage rings, which can describe the particle loss rate quantitatively and is restrict by quantum lifetime, beam-gas scattering and Touschek effect. The upgrade project of Hefei light source, named HLSII, has greatly improved the performance of the light source. The beam lifetime has been maintained at more than 5 hours. In this paper, a combined analysis method is derived by the analysis of the beam lifetime, and the method is applied to the HLSII storage ring. The experimental results show that this method is simple and reliable for the analysis of the Touschek lifetime and beam-gas scattering lifetime.
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THPVA093	Open XAL Status Report 2017	4676
	A.P. Zhukov, C.K. Allen, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA D.A. Brown NMSU, Las Cruces, New Mexico, USA Y.-C. Chao SLAC, Menlo Park, California, USA C.P. Chu, Y. Li IHEP, Beijing, People's Republic of China J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati ESS, Lund, Sweden P. Gillette, P. Laurent, E. Lécorché, G. Normand GANIL, Caen, France I. List, M. Pavleski Cosylab, Ljubljana, Slovenia X.H. Lu CSNS, Guangdong Province, People's Republic of China J.E. Muller CERN, Geneva, Switzerland
	The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.
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THPVA095	Storage Ring Injection Kickers Alignment Optimization in NSLS-II	4683
	G.M. Wang, W.X. Cheng, J. Choi, T.V. Shaftan, X. Yang BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The SR is designed to work in top-off injection mode. The injection straight includes a septum and four fast kicker magnets with independent amplitude and timing control. Ideally, fast kickers formed a local bump, which is transparent to stored beam during top off injection. Due to mismatch of kicker voltage, timing or waveform, there is residual betatron oscillation and impact normal operation. This paper will present the injection kicker waveform measurement with beam, local and global alignment optimization to in improve top off injection transition.
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Paper

Title

Page

Beam-Based Optimization of Storage Ring Nonlinear Beam Dynamics

3627

X. Huang, J.A. Safranek
SLAC, Menlo Park, California, USA

Funding: Work supported in part by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
This paper will present considerations and algorithms for direct online optimization of the nonlinear beam dynamics of existing and future storage rings. The experimental setup and results from using this approach to improve the dynamic aperture of the SPEAR3 storage ring, using the robust conjugate direction search method and the particle swarm optimization method, will be covered.

Slides THXA1 [1.589 MB]

DOI •

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THPAB072

Application of Voronoi Diagram to Mask-Based Intercepting Phase-Space Measurements

3872

A. Halavanau, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
Q. Gao, J.G. Power, E.E. Wisniewski
ANL, Argonne, Illinois, USA
Q. Gao
TUB, Beijing, People's Republic of China
G. Ha
POSTECH, Pohang, Kyungbuk, Republic of Korea
P. Piot
Fermilab, Batavia, Illinois, USA

Intercepting multi-aperture masks (e.g. pepper pot or multislit mask) combined with a downstream transverse-density diagnostics (e.g. based on optical transition radiation or employing scintillating media) are commonly used for characterizing the phase space of charged particle beams and the associated emittances. The required data analysis relies on precise calculation of the RMS sizes and positions of the beamlets originated from the mask which drifted up to the analyzing diagnostics. Voronoi diagram is an efficient method for splitting a plane into subsets according to the distances between given vortices. The application of the method to analyze data from pepper pot and multislit mask based measurement is validated via numerical simulation and applied to experimental data acquired at the Argonne Wakefield Accelerator facility. We also discuss the application of the Voronoi diagrams to quantify transversely-modulated beams distortion.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB072

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THPAB092

Orbit and Dispersion Tool at European XFEL Injector

3932

SUSPSIK088

use link to see paper's listing under its alternate paper code

N. Ghazaryan
CANDLE SRI, Yerevan, Armenia
M.E. Castro Carballo, W. Decking
DESY, Hamburg, Germany

Trajectory and electron beam size play an essential role in Free Electron Laser (FEL) obtainment. Since transverse dispersion changes off-energy particle trajectories and increases the effective beam size, dispersion and orbit must constantly be controlled and corrected along the whole lattice. In this paper the principles underlying the orbit and dispersion correction tool, developed at DESY, are described. The results of its testing on European XFEL injector are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB092

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THPAB096

Automatized Optimization of Beam Lines Using Evolutionary Algorithms

3941

S. Appel, V. Chetvertkova, W. Geithner, F. Herfurth, U. Krause, S. Reimann, M. Sapinski, P. Schütt
GSI, Darmstadt, Germany
D. Österle
KIT, Karlsruhe, Germany

Due to the massive parallel operation modes at GSI accelerators, a lot of accelerator setup and re-adjustment has to be made by operators during a beam time. This is typically done manually using potentiometers and is very time-consuming. With the FAIR project the complexity of the accelerator facility increases further and for efficiency reasons it is recommended to establish a high level of automation for future operation. Modern Accelerator Control Systems allow a fast access to both, accelerator settings and beam diagnostics data. This provides the opportunity to implement algorithms for automated adjustment of e.g. magnet settings to maximize transmission and optimize required beam parameters. The fast-switching magnets in GSI-beamlines are an optimal basis for an automatic exploration of the parameter-space. The optimization of the parameters for the SIS18 multi-turn-injection using a genetic algorithm has already been simulated*. The first results of our automatized online parameter optimization at the CRYRING@ESR injector are presented here.
[*] S. Appel, O. Boine-Frankenheim: Optimization of Multi-turn Injection into a Heavy-Ion Synchrotron using Genetic Algorithms, Proceedings of IPAC2015, Richmond, USA (2015)

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THPAB104

Engineering Documentation and Asset Management for the European XFEL Accelerator

3960

L. Hagge, J.A. Dammann, T.T. Hongisto, J. Kreutzkamp, D. Käfer, B. List, S. Rohwedder, S. Sühl, N. Welle
DESY, Hamburg, Germany
A. Frank
European XFEL, Schenefeld, Germany

At the European XFEL, extensive technical documentation has been created during design and construction of the accelerator. It is based on a configuration database (the DESY EDMS), which provides an inventory of major accelerator systems. The configuration database registers components and their used materials, tracks component design and fabrication history, and contains engineering documents and drawings, and work and inspection records. Technical documentation can be accessed through intuitive reports and navigational tree structures, representing specific beamline sections or areas of the facility. Access on mobile devices in the accelerator tunnel is supported by component tags with QR codes. A dedicated front-end has been developed for automatically uploading and cross-linking documents to the configuration database, reducing documentation efforts in the project teams. The configuration database now serves as a foundation for upcoming technical operation and maintenance activities. The paper provides an overview of the available engineering documentation and its access methods, and discusses its expected role and benefits in future maintenance processes.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB104

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THPAB121

The Study of Accelerator Data Archiving and Retrieving Software

4007

SUSPSIK089

use link to see paper's listing under its alternate paper code

Y.S. Qiao, G. Lei, Z. Zhao
IHEP, Beijing, People's Republic of China

This paper presents a novel archiving and retrieving software designed for BEPC-II and other particle accelerators. At BEPC-II, real-time data are stored as index files recorded by traditional EPICS Channel Archiver. Never-theless, index files are not suitable for long-term maintenance and difficult for data analysis. The NoSQL database MongoDB is used for this new system due to aging technologies, so as to promote the data storage reliability, usability, and possible future advanced data analysis. A cross-platform UI (User Interface) has also been developed to make it quicker and easier to access the database. The writing and query performance are tested for this software.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB121

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THPAB122

Open XAL Development for Xi'an Proton Application Facility

4010

Y. Yang, X. Guan, Y. Lei, W. Wang, X.W. Wang, S.X. Zheng
TUB, Beijing, People's Republic of China
M.C. Wang, Z.M. Wang, H.Z. Zhang
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China

Beam commission tools for Xi'an Proton Application Facility (XiPAF) will be developed based on Open XAL. In this paper, we present preparations made for adopting Open XAL in XiPAF, including a newly designed database schema based on MySQL, modifying db2xal application based on database schema to create optics file automatically. We also add time-dependent nodes in XiPAF's online model to meet the need of energy ramping in synchrotron. A set of high-level applications as well as a new virtual accelerator is under development.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB122

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THPAB136

Kameleon - a Behavior-Rich, Non-Memoryless and Time-Aware Generic Simulator

4040

R.N. Fernandes
ESS, Lund, Sweden
N. Senaud
CEA/DRF/IRFU, Gif-sur-Yvette, France

At ESS, thousands of devices will be used to control both the machine and end-station instruments. To enable ongoing development when access to these devices is not possible (for whatever the reason), Kameleon was implemented. It is a behavior-rich, non-memoryless and time-aware generic simulator that handles clients through a TCP/IP connection. An instance of this client is an EPICS IOC or a Tango Device Server. Kameleon consumes a user-defined file that describes the commands received from a client and, optionally, the reaction to these through statuses sent back to the client. Key features are: 1) Ubiquitous (runs in disparate platforms such as Windows and Linux). 2) Behavior-rich (predefined behaviors as well as user-defined). 3) Non-memoryless (the state of the simulation can be preserved between events and/or elapsed time). 4) Time-aware (statuses can be sent to the client either event-based or time-based). 5) Flexible (commands and statuses are described in a simple user-defined file - nothing is hard-coded in Kameleon). Kameleon will be used in a myriad of scenarios at ESS such as development of EPICS devices support, IOCs, OPI screens, testing of IOCs and alarm workflows.

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THPAB137

New Approach in Developing Open XAL Applications

4043

C. Rosati, E. Laface
ESS, Lund, Sweden

Open XAL project is a pure-Java open source development environment used for creating accelerator physics applications, scripts and services. Working with Open XAL requires developing a Java application with a prominent graphical user interface, allowing the final user to interact with the accelerator model, and to graphically view the results such interaction produced. Nevertheless the Open XAL support for specialized components (handling plotting, EPICS connection) and for a document-view application framework, relieving the developer of the burden related with this programming aspects, a lot of boilerplate code has still to be created, making the developer spending more time in UI than in accelerator physics code. In this paper a new approach in developing Open XAL applications is explained. Here the developer is relieved of the UI-related common code code by using software tools, allowing him to visually design the flow of data and events between the various elements of the applications (widgets and models), and automatically generate the application code, where code generation can be customized to use one of the available plugged programming languages (Java, Python, JS, …).

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB137

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THPAB140

MAX IV Online Linac Model

4047

L. Isaksson, E. Mansten, S. Thorin
MAX IV Laboratory, Lund University, Lund, Sweden

An online linac model has been developed at MAX IV in order to enable a calculation of the properties of the linac beam based on the actual settings of the magnetic elements. The model is based on the Elegant simulation code and uses the design linac lattice file. A set of Matlab scripts fetch the actual settings of all elements via the Tango control system, pass these values on to Elegant and run the simulation. The model includes an optimization option for yielding desired beta- and alpha-function values at various points along the linac by calculating optimal settings for chosen elements.

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THPAB145

CERN Accelerators Topology Configuration: Facing the Next Long Shutdown

4066

S. Bartolome-Jimenez, T.W. Birtwistle, S. Chemli, N. Gilbert, A.-L. Perrot, J. Piar, V. Simetka, B. Vazquez de Prada Planas
CERN, Geneva, Switzerland

The Configuration and Layout (CL) team at CERN ensures that there is a clear and coherent representation of the status of the CERN underground facilities (about 60 km of equipment) and main accelerator projects at a given point in time. In view of the major equipment changes to be carried out during the extended end of year technical stop (EYETS), the next Long Shutdown (LS2), and to facilitate the associated preparatory work of multiple CERN groups, the CL team has developed an immersive visualisation tool, displaying 360 degree panoramic images of CERN underground facilities. In addition, the CL team is launching a process to manage future layout configurations inside the CERN Layout database in parallel to the current configuration. This paper presents the 360 degree panorama visualisation tool and the parallel configuration process, to view the past, current and future status of the CERN accelerator complex. It highlights their added value for the CERN groups in the preparatory phase for upgrade and consolidation modifications and discusses the potential future improvements.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB145

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THPAB146

Investigation of the Remanent Field of the SPS Main Dipoles and Possible Solutions for Machine Operation

4069

F.M. Velotti, H. Bartosik, J. Bauche, M.C.L. Buzio, K. Cornelis, M.A. Fraser, V. Kain
CERN, Geneva, Switzerland

The CERN Super Proton Synchrotron (SPS) provides different types of beams at different extraction energies. The main magnets of the SPS are regulated with a current loop, but it has turned out that hysteresis effects from the main dipoles have a significant impact on reproducibility and hence efficiency and availability. Beam and machine parameters were found to depend on the programmed sequence of magnetic cycles - the so-called super cycle - representing the production of the different beams. The scientific program of the SPS requires frequent changes of the supercycle composition and the effect of the main magnet hysteresis has to be understood, modelled and used in accelerator control system. This paper summarises the first main field measurements carried out with the currently available systems during operational conditions as well as measurements of vital machine and beam parameters as a function of the super cycle composition. Finally, ideas will be presented to provide reproducibility by automatically correcting different parameters taking the magnetic history of the main magnets into account.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB146

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THPAB147

Automatic Local Aperture Measurements in the SPS

4073

V. Kain, H. Bartosik, S. Cettour Cave, K. Cornelis, F.M. Velotti
CERN, Geneva, Switzerland

The CERN SPS (Super Proton Synchrotron) serves as LHC injector and provides beam for the North Area fixed target experiments. It is equipped with flat vacuum chambers to accommodate the large horizontal beam size required during transition crossing and slow extraction. At low energy, the vertical acceptance becomes critical with high intensity large emittance fixed target beams. Optimizing the vertical available aperture is a key ingredient to optimize transmission and reduce activation around the ring. Aperture measurements are routinely carried out after each shutdown. Global vertical aperture measurements are followed by detailed bump scans at the locations with the loss peaks. During the 2016 run a tool was developed to provide an automated local aperture scan around the entire ring. This allowed to establish detailed reference measurements of the vertical aperture and identify directly the SPS aperture bottlenecks. The methodology applied for the scans will be briefly described in this paper and the analysis discussed. Finally, the 2016 SPS measured vertical aperture will be presented and compared to the results obtained with the previous method.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB147

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THPAB149

Characterization of the THz Radiation-Based Bunch Length Measurement System for the NSRRC Photoinjector

4080

C.C. Liang, B.Y. Chen, C.H. Chen, M.C. Chou, S. Fann, C.S. Huang, N.Y. Huang, J.-Y. Hwang, W.K. Lau, A.P. Lee, T.Y. Lee, W.Y. Lin, T.-C. Yu
NSRRC, Hsinchu, Taiwan

A part of high brightness photo-injection (HBI) project at NSRRC is intending to adopt Coherent Transition Radiation (CTR) and Coherent Undulator Radiation (CUR) to generate THz radiation with an ultrashort electron bunch. Such high intensity THz sources allow the THz spectrum to be conducted easily with a THz interferometer and a Golay cell detector. Furthermore, the radiation spectrum carries information of the electron distribution which allows ultrashort electron bunch length measurements. For verifying correct measuring procedure during the CTR and CUR experiments, a conventional THz radiation generated by optical rectification from a ZnTe crystal has been performed. The produced THz pulse was sent into a Michelson interferometer which is designed for the autocorrelation of the intense, sub-mm and mm-wavelength, spatially-coherent radiation pulses. The THz spectrum can be further obtained from the interferogram by the Fourier transform process. In such way, the THz spectrum can be investigated if the result is satisfactory and can be applied on the THz CTR and CUR experiments for the next step.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB149

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THPAB151

Online Optimisation Applications at SPS

4086

T. Pulampong, P. Klysubun, S. Kongtawong, S. Krainara, P. Sudmuang
SLRI, Nakhon Ratchasima, Thailand

Optimisation of a particle accelerator with very limited diagnostic system is proved to be very challenging and complicated. Theoretical calculation and perfect machine model never guarantee the best solution in the actual machine. In this work, optimisation of injection system from Low energy Beam Transport line (LBT) to Siam Photon Source (SPS) storage ring and reduction of beam coupling employing Robust Conjugate Direction Search (RCDS) algorithm are demonstrated. New record improvement on injection efficiency and better coupling control will be presented.

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THPAB153

An Online Multi-Objective Optimisation Package

4092

I.P.S. Martin, M. Apollonio, R. Bartolini, M.J. Furseman
DLS, Oxfordshire, United Kingdom
R. Bartolini, G.A. Bird
JAI, Oxford, United Kingdom
D.R. Obee
Durham University, Durham, United Kingdom

The overall performance of an electron storage ring is critically dependant on a large number of variables. It can be characterised in many ways, such as by lifetime, injection efficiency, beam stability and so on. It is frequently the case however that improving one parameter comes at the cost of harming another. Equally, given the large number of variables involved in optimising the ring performance, the true, global optimum solution may be difficult to identify using simple parameter scans. In order to address this problem, a flexible optimisation tool has been developed. This tool is capable of optimising several parameters at once and can cope with an arbitrary number of variables (individually or in families). The tool is designed to be robust to measurement noise, and has been applied to a number of different optimisation problems. This paper presents an overview of the package, as well as the results of the first tests.

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THPIK064

Beam Lifetime Analysis of HLS-II Storage Ring

4242

K. Xuan, C. Li, J.Y. Li, G. Liu, G. Liu, J.G. Wang, L. Wang, W. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Beam lifetime is one of the important parameters of electron storage rings, which can describe the particle loss rate quantitatively and is restrict by quantum lifetime, beam-gas scattering and Touschek effect. The upgrade project of Hefei light source, named HLSII, has greatly improved the performance of the light source. The beam lifetime has been maintained at more than 5 hours. In this paper, a combined analysis method is derived by the analysis of the beam lifetime, and the method is applied to the HLSII storage ring. The experimental results show that this method is simple and reliable for the analysis of the Touschek lifetime and beam-gas scattering lifetime.

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THPVA093

Open XAL Status Report 2017

4676

A.P. Zhukov, C.K. Allen, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
D.A. Brown
NMSU, Las Cruces, New Mexico, USA
Y.-C. Chao
SLAC, Menlo Park, California, USA
C.P. Chu, Y. Li
IHEP, Beijing, People's Republic of China
J.F. Esteban Müller, B.T. Folsom, E. Laface, Y.I. Levinsen, C. Rosati
ESS, Lund, Sweden
P. Gillette, P. Laurent, E. Lécorché, G. Normand
GANIL, Caen, France
I. List, M. Pavleski
Cosylab, Ljubljana, Slovenia
X.H. Lu
CSNS, Guangdong Province, People's Republic of China
J.E. Muller
CERN, Geneva, Switzerland

The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010 The goal of the collaboration is to establish Open XAL as a multi-purpose software platform supporting a broad range of tool and application development in accelerator physics (Open XAL also ships with a suite of general purpose accelerator applications). This paper discusses progress in beam dynamics simulation, interaction with control system and software organization. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.

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THPVA095

Storage Ring Injection Kickers Alignment Optimization in NSLS-II

4683

G.M. Wang, W.X. Cheng, J. Choi, T.V. Shaftan, X. Yang
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The SR is designed to work in top-off injection mode. The injection straight includes a septum and four fast kicker magnets with independent amplitude and timing control. Ideally, fast kickers formed a local bump, which is transparent to stored beam during top off injection. Due to mismatch of kicker voltage, timing or waveform, there is residual betatron oscillation and impact normal operation. This paper will present the injection kicker waveform measurement with beam, local and global alignment optimization to in improve top off injection transition.

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