Keyword: software
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MOPAB061 DAΦNE BTF Improvements of the Transverse Beam Diagnostics detector, linac, timing, positron 250
 
  • P. Valente
    INFN-Roma, Roma, Italy
  • B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
    INFN/LNF, Frascati (Roma), Italy
  
  The DAΦNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e- and 540 MeV for e+), intensity (from single particle up to 1010/bunch) and pulse length (in the range 1.5-40 ns) up to 49 Hz, depending on the operations of the DAΦNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focusing conditions is reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB061  
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MOPAB089 Development of a Digital Beam Signal Processor Test System Based on MATLAB and SCPI EPICS, controls, hardware, data-acquisition 329
 
  • F.Z. Chen, L.W. Lai, Y.B. Leng, N. Zhang
    SSRF, Shanghai, People's Republic of China
  • Y.B. Yan
    SINAP, Shanghai, People's Republic of China
  
  The SXFEL (Soft X-ray Free Electron Laser) and DCLS (Dalian Coherence Light Source) have been under con-structions since 2015. To satisfy the huge demands of digital beam position monitor processor, we batch pro-duced over 200 sets of DBPM processor. This paper de-scribes a high automatic test platform based on MATLAB and SCPI, used for the device acceptance test and performance evaluation. The simulation beam sig-nals generated by the Agilent signal source MXG N5181A, connected to a 4-way power splitter. The network control system based on the architecture of the client and server mode, integrated instruments test commands and exper-imental data transferred via a Mercury router. Using EP-ICS LabCA realized the data acquisition channel access interface. The platform has been successfully used for the Dalian Coherent Light Source (DCLS) devices acceptance testing, the noise level, crosstalk between channels, ampli-tude frequency response and SNR test reports automatic generation under test.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB089  
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MOPAB096 Universal Digital Aggregator for in-Line Signal Processing hardware, target, operation, PLC 352
 
  • M.P. Kopeć, L.J. Dudek, A. Kisiel, M.A. Knafel, A.I. Wawrzyniak, M. Zając
    Solaris National Synchrotron Radiation Centre, Jagiellonian University, Kraków, Poland
  
  Universal digital aggregator is a device for general signal processing with around 100kHz bandwidth. It contains of 4 inputs and 4 open-drain outputs - all of which are fully programmable. When the number of controlling digital signals exceeds the number of input ports of a device there is a need to either multiplex those signals or process them before the target device. The aggregator can be powered from the target device so no additional cabling is needed, especially considering its low power consumption. This straightforward, complex and portable device can be easily applied where PLC solutions are difficult to implement.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB096  
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MOPIK036 Study of the Magnetizing Relationship of the Kickers for CSNS kicker, extraction, neutron, target 582
 
  • M.Y. Huang, Y.W. An, S. Fu, N. Huang, W. Kang, Y.Q. Liu, L. Shen, L. Wang, S. Wang, Y.W. Wu, S.Y. Xu, J. Zhai, J. Zhang
    IHEP, Beijing, People's Republic of China
  
  Funding: Work supported by National Natural Science Foundation of China (11205185)
The extraction system of CSNS mainly consists of two kinds of magnets: eight kickers and one lambertson magnet. In this paper, firstly, the magnetic test results of the eight kickers were introduced and then the filed uniformity and magnetizing relationship of the kickers were given. Secondly, during the beam commissioning in the future, in order to obtain more accurate magnetizing relationship, a new method to measure the magnetizing coefficients of the kickers by the real extraction beam was given and the data analysis would also be processed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK036  
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MOPIK072 Recent Upgrades of the Bunch Arrival Time Monitors at FLASH and European XFEL laser, controls, electronics, electron 695
 
  • 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 and European XFEL a high resolution intra train bunch arrival time measurement is mandatory, providing a crucial information for the beam based feedback system. At FLASH and European XFEL a reliable arrival time detection with a resolution better than 0.1% is required for a broad range of bunch charges, from 1 nC down to 20 pC. The system developed is based on electro-optical sampling where an ultra-short pulsed laser is employed. Several bunch arrival time monitors (BAM) were developed and are since 2012 in operation at the FLASH facility. A major upgrade involved the development of new hardware and software based on the MTCA standard. Special operation mode at both facilities includes the possibility to subdivide the bunch train in up to three segments, each with different bunch energy and charge, causing variation of the time jitter within the bunch train itself. A further upgrade includes the measurement of the arrival time and application of delay correction for each of the three segments. In this poster, we describe the development, installation and commissioning of the hardware, firmware and software of the new system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK072  
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MOPVA037 Development and Commissioning of the Doppler-Shift Unit for the Measurement of the Ion Species Fractions and Beam Energy of the ESS Proton Source proton, coupling, linac, optics 936
 
  • C.A. Thomas, T.J. Shea
    ESS, Lund, Sweden
  • J. Fils
    GSI, Darmstadt, Germany
  • Y. Lussignol, P. Mattei
    CEA/DSM/IRFU, France
  • Ø. Midttun
    University of Bergen, Bergen, Norway
  • L. Neri
    INFN/LNS, Catania, Italy
  • F. Senée, O. Tuske
    CEA/IRFU, Gif-sur-Yvette, France
  
  ESS proton source is in going to be soon delivered to the ESS project. In order to qualify the source, a series of beam instrumentation diagnostics have been designed and produced. In particular, a specific spectrograph dedicated to the fraction species measurement is currently commissioned. This instrument not only is capable of measuring the fraction species produced by the source, but also it can measure their energy and energy spread, the mass of the different species, and additional spectral rays coming from the gas species in presence in the vacuum chamber. We present in this paper the commissioning of this instrument, the Doppler Shift unit, dedicated to the measurement of the fraction species.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA037  
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MOPVA094 ESS Spoke Cavity Conditioning at FREIA cavity, vacuum, controls, feedback 1074
 
  • H. Li, K.J. Gajewski, L. Hermansson, M. Jobs, R.J.M.Y. Ruber, R. Santiago Kern
    Uppsala University, Uppsala, Sweden
  
  The first ESS double spoke cavity installed with RF power coupler was tested in the HNOSS cryostat at the FREIA Laboratory. Power coupler and cavity conditioning have been optimized in order to reach high efficiency and high availability by reducing the time and effort of the overall conditioning process. Meanwhile, an optimal procedure for ESS conditioning is studied. This paper presents the study result and experience of the RF conditioning procedure for the first ESS double spoke cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA094  
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TUPAB007 Analysis of the Dependability of the LHC Quench Detection System During LHC Run 2 and Further System Evolution radiation, operation, electronics, superconducting-magnet 1311
 
  • T. Podzorny, D.O. Calcoen, R. Denz, A.P. Siemko, J. Spasic, J. Steckert
    CERN, Geneva, Switzerland
  
  The quench detection system (QDS) of the LHC superconducting circuits is an essential part of the LHC machine protection and ensures the integrity of key elements of the accelerator. The large amount of hardwired and software interlock channels of the QDS requires a very high system dependability in order to reduce the risk of affecting the successful operation of the LHC. This contribution will present methods and tools for systematic fault tracking and analysis, and will discuss recent results obtained during the LHC production run in 2016. Measures for maintaining and further improving of the system performance will be explained. An overview of the further evolution of the LHC QDS also in view of the upcoming High Luminosity Upgrade of the LHC will be given.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB007  
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TUPAB043 Design and Simulation of Voltage Multiplier Column of a 300keV, 10mAParallel Fed Cockcroft Walton Electron Accelerator for Industrial Applications simulation, electron, coupling, gun 1421
 
  • M. Nazari, F. Abbasi Davani, F. Ghasemi
    Shahid Beheshti University, Tehran, Iran
  • S. Ahmadiannamin
    ILSF, Tehran, Iran
  
  In this article a 300keV, 10mA multiplier column has been designed for a parallel fed Cockcroft Walton electron accelerator for industrial applications. The parallel fed Cockcroft Walton multiplier is a capacitive coupling multiplier with diode rectification which can convert an input RF voltage to a low ripple output DC voltage. In this research tried to get a low ripple (300keV output) dc voltage. At first, the voltage multiplier column has been simulated with pspice simulation software. After doing the pspice simulations, optimum value of different parameters has been get. At the end we try to get the optimum values of pspice simulations with a mechanical design with CST STODIO. The mechanical design of voltage multiplier and its equivalent circuit hah a good accordance with each other.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB043  
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TUPAB125 Magnetic Field Measurements at LBNL on Soft X-Ray and Hard X-Ray Undulator Segments for the Linear Coherent Light Source Upgrade (LCLS-II) Project undulator, photon, linac, alignment 1612
 
  • E.J. Wallén, D. Arbelaez, J.N. Corlett, L. Fajrado, H.W. Kim, M. Leitner, S. Marks, D. Schlueter, A. Zikmund
    LBNL, Berkeley, California, USA
  • Yu.I. Levashov, H.-D. Nuhn, Z.R. Wolf
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the Director, O'ce of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Stanford Linear Accelerator Laboratory is currently constructing the Linear Coherent Light Source II (LCLS-II), a FEL which will deliver x-rays at an energy range 0.2-5 keV at high repetition rate of up to 1 MHz using a new 4 GeV superconducting linac, and at an energy range 1-25 keV when using the existing copper linac at up to 120 Hz. To cover the full photon energy range, LCLS-II includes two variable-gap, hybrid-type permanent magnet undulator lines: A soft x-ray undulator (SXR) line with 21 undulator segments for the photon energy range 0.2-1.3 keV plus a hard x-ray undulator (HXR) line with 32 undulator segments designed for a photon energy range from 1-5 keV when using the superconducting linac. The HXR line is also designed to support 25 keV and higher photon energies when using the existing copper linac. Lawrence Berkeley National Laboratory (LBNL) is responsible for fabricating the undulators and tuning 23 of the HXR undulators. This paper summarizes the magnetic field measurements carried out on the pre-production undulators and describes the plans at LBNL for the magnetic measurements on the HXR undulators in series production. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB125  
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TUPIK007 VisualPIC: A New Data Visualizer and Post-Processor for Particle-in-Cell Codes simulation, plasma, interface, GUI 1696
 
  • A. Ferran Pousa, R.W. Aßmann
    DESY, Hamburg, Germany
  • A. Martinez de la Ossa
    University of Hamburg, Hamburg, Germany
  
  Numerical simulations are heavily relied on for evaluating optimal working points with plasma accelerators and for predicting their performance. These simulations produce high volumes of complex data, which is often analyzed by scientists with individually prepared software and analysis tools. As a consequence, there is a lack of a commonly available, quick, complete and easy-to-use data visualizer for Particle-In-Cell simulation codes. VisualPIC is a new application created with the aim of filling that void, providing a graphical user interface with advanced tools for 2D and 3D data visualization, post-processing and particle tracking. The program is developed under the principles of open source and with a modular design, an approach and architecture which allow interested scientists to contribute by adding new features or compatibility for additional simulation codes.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK007  
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TUPIK042 Solenoid Alignment for the SRF Photoinjector of BERLinPro at HZB solenoid, alignment, SRF, electron 1778
 
  • G. Kourkafas, A. Jankowiak, T. Kamps, J. Li, J. Völker
    HZB, Berlin, Germany
  • M. Schebek
    Humboldt University Berlin, Berlin, Germany
  
  The Berlin Energy Recovery Linac Prototype (BERLinPro) at Helmholtz Zentrum Berlin (HZB) aims to deliver a continuous-wave (cw) electron beam of high average current (100 mA) and brilliance (normalized emittance below 1 mm mrad). The achievement of these demanding goals depends significantly on the performance of the electron source, a superconducting RF (SRF) photoinjector. A critical component for the quality of the generated beam is the superconducting solenoid magnet. In order to optimize its operation and minimize parasitic contributions, special attention has been given to the precise alignment of this element using a hexapod mover. Due to the strict limitations inside a cryostat, a complex coupling between the solenoid in vacuum and the hexapod in air has been realized, requiring sophisticated software and hardware mechanisms to prevent collisions. Along with this setup, the developed beam-based alignment procedure and its performance are demonstrated in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK042  
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TUPIK045 Closed Orbit Feedback for FAIR - Prototype Tests at SIS18 controls, feedback, closed-orbit, distributed 1784
 
  • B.R. Schlei, H. Liebermann, D. Ondreka, P.J. Spiller, R.J. Steinhagen
    GSI, Darmstadt, Germany
  
  A new steering software for cycle-to-cycle closed orbit as well as trajectory control is currently under development for FAIR's planned control system. It has been successfully tested with beam at the SIS18 in 2016. COAT (i.e., Controlling Orbits And Trajectories) has been realized as a distributed, Java-based application. It consists of a background daemon process that handles the actual beam-based feedback logic, and independent clients that provide visualization and various user-interaction capabilities. Built on top of the LSA settings management system, code-shared and also used at CERN, the system is kept generic. Furthermore, it is designed to support multiple accelerators, transfer lines and users in parallel. In particular, it can handle continuously changing optics and other in advance known changing beam parameters. The COAT computer program is part of a set of newly developed beam-based feedback tools* for FAIR. Preliminary results of our proof-of-concept prototype studies indicate, e.g., in view of the observed SIS18 machine reproducibility, that such a cycle-to-cycle feedback control scheme may be adequate also for the other FAIR accelerators and transfer lines.
*see separate contribution by R. J. Steinhagen et al. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK045  
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TUPIK049 ChimeraTK - A Software Tool Kit for Control Applications controls, framework, hardware, EPICS 1798
 
  • G. Varghese, M. Heuer, M. Hierholzer, M. Killenberg, L.P. Petrosyan, Ch. Schmidt, N. Shehzad, M. Viti
    DESY, Hamburg, Germany
  • K. Czuba, A. Dworzanski
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • C.P. Iatrou, J. Rahm
    TU Dresden, Dresden, Germany
  • T. Kozak, P. Prędki, J. Wychowaniak
    TUL-DMCS, Łódź, Poland
  • M. Kuntzsch, R. Steinbrück
    HZDR, Dresden, Germany
  • S. Marsching
    Aquenos GmbH, Baden-Baden, Germany
  • A. Piotrowski
    FastLogic Sp. z o.o., Łódź, Poland
  
  The presentation provides an overview of the ChimeraTK framework. The project started from a demand for software libraries that provide convenient access to PCIE bus based cards on the MicroTCA.4 platform. Previously called MTCA4U, ChimeraTK is evolving towards a set of frameworks and tools that enable users to build up control applications, while abstracting away specifics of the underlying system. Initially, the focus of the project was the DeviceAccess C++ library and its bindings for Matlab and Python, along with a Qt based client that used DeviceAccess under the hood. However, ChimeraTK has expanded to include more tools like the ControlSystemAdapter, VirtualLab and ApplicationCore. The ControlSystemAdapter framework focuses on tools that enable application code to be written in a middle ware agnostic manner. VirtualLab focuses on facilitating testing of application code and providing functional mocks. The ApplicationCore library aims at unifying application interfaces to other tools in the toolkit and improving abstraction. We present an update on improvements to the project and discuss motivations and applications for these new set of tools introduced into the toolkit.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK049  
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TUPIK057 The Real-Time Waveform Mask Interlock System for the RF Gun Conditioning of the ELI-NP Gamma Beam System gun, vacuum, operation, real-time 1822
 
  • S. Pioli, D. Alesini, A. Gallo, L. Piersanti
    INFN/LNF, Frascati (Roma), Italy
  • F. Cardelli, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
  • D.T. Palmer
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  
  The new Gamma Beam System (GBS), within the ELI-NP project, under installation in Magurele (RO) by INFN, as part of EuroGammas consortium, can provide gamma rays that open new possibilities for nuclear photonics and nuclear physics. ELI-GBS gamma rays are produced by Compton back-scattering to get monochromaticity (0,1% bandwidth), high flux (1013 photon/s the highest in the world), tunable directions and energies up to 19 MeV. Such gamma beam is obtained when a high-intensity laser collides a high-brightness electronbeam with energies up to 720 MeV. The RF-Gun, made with the novel clamping gasket technique, working in '-mode at 100 Hz with a max. RF input of 16 MW, RF peak field of 120 MV/m and filling time of 420 ns was fully tested and conditioned few month ago at ELSA. This paper will describe the real-time fast-interlock system based on waveform mask technique used during RF Gun conditioning in order to monitor on-line reflected RF signals for a faster pulse-to-pulse detection of breakdowns and to ensure the safety of Gun and modulator tripping such devices before next RF pulse.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK057  
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TUPIK061 Data Acquisition and Controls Integration of the AWAKE Experiment at CERN controls, experiment, proton, extraction 1833
 
  • V.K.B. Olsen
    University of Oslo, Oslo, Norway
  • J.J. Batkiewicz, S. Deghaye, S.J. Gessner, E. Gschwendtner
    CERN, Geneva, Switzerland
  • P. Muggli
    MPI, Muenchen, Germany
  
  The AWAKE experiment has been successfully installed in the CNGS facility at CERN, and is currently in its first stage of operation. The experiment seeks to demonstrate self-modulation of an SPS proton beam in a rubidium plasma, driving a wakefield of several gigavolt per meter. We describe the data acquisition and control system of the AWAKE experiment, its integration into the CERN control system and new control developments specifically required for AWAKE.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK061  
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TUPIK063 The Configurable Software Interlock System for HLS-II operation, EPICS, controls, vacuum 1836
 
  • Y. Song, G. Liu, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  The interlock system is an essential component for an accelerator facility. A configurable software interlock system(SIS) is designed for Hefei Light Source II (HLS-II), which complements the hardware interlock system to ensure equipment and operators' safety. The system is developed using Python under the EPICS framework with the method of separating the configuration file from the interlock program. The interlock logic is completely determined by the configuration file and its nested tree structure is easy to expand. The test results indicate that the new software interlock system is reliable, flexible and convenient to operate. This paper will describe the design and the construction of HLS-II SIS.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK063  
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TUPIK064 Application of Smoothing Analysis in the Alignment and Installation Process of Particle Accelerator alignment, storage-ring, closed-orbit, Windows 1839
 
  • W. Wang, X.Y. He, L. Lin, F.F. Wu, Q. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  With the development of technology and theory of particle accelerator, the new particle accelerators will be built in the near future. Comparing with the running accelerators, higher efficiency and accuracy of installation and alignment are required. It is necessary for all the storage ring magnets to be placed with a high relative accuracy to meet the stringent demands of accelerator physics. Smoothing analysis is a practical method considering both relative accuracy and work efficiency. This article mainly introduces the principle and application of smoothing analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK064  
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TUPIK065 A Software for Smoothing Magnet Track in Particle Accelerator* interface, alignment, storage-ring, network 1842
 
  • Q. Zhang, X.Y. He, G. Liu, W. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  This article describes a software for smoothing magnet track in particle accelerator. This paper introduces the development process of the software from the aspects of interface design, algorithm analysis, parameter meaning and so on. Magnet track smoothing means that under the conditions of meeting absolute accuracy, if the relative position error of the adjacent magnet is too large, it will cause the loss of beam, we call the track curve is not smooth enough. Smooth analysis can find these magnet components, the curve is smooth after a reasonable ad-justment. The software is based on the least square method. The software is tested by using the data of HLS storage ring, the results meet the needs of the work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK065  
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TUPIK087 Phase Advance Interlocking Throughout the Whole LHC Cycle quadrupole, optics, kicker, operation 1901
 
  • K. Fuchsberger, A. Calia, M.A. Galilée, G.H. Hemelsoet, M. Hostettler, D. Jacquet, J. Makai, M. Schaumann
    CERN, Geneva, Switzerland
  
  Each beam of CERN's Large Hadron Collider (LHC) stores 360 MJ at design energy and design intensity. In the unlikely event of an asynchronous beam dump, not all particles would be extracted immediately. They would still take one turn around the ring, oscillating with potentially high amplitudes. In case the beam would hit one of the experimental detectors or the collimators close to the interaction points, severe damage could occur. In order to minimize the risk during such a scenario, a new interlock system was put in place in 2016. This system guarantees a phase advance of zero degrees (within tolerances) between the extraction kicker and the interaction point. This contribution describes the motivation for this new system as well as the technical implementation and the strategies used to derive appropriate tolerances to allow sufficient protection without risking false beam dump triggers.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK087  
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TUPIK088 Development of a New System for Detailed LHC Filling Diagnostics and Statistics injection, diagnostics, framework, controls 1905
 
  • A. Calia, K. Fuchsberger, G.H. Hemelsoet, D. Jacquet
    CERN, Geneva, Switzerland
  
  In the CERN accelerator complex the Super Proton Synchrotron (SPS) is used as injector of the Large Hadron Collider (LHC). Statistics on the injection and beam availability in 2015 showed that too much time is spent at injection. Reducing this time could improve LHC availability and luminosity over the year. Currently, useful data to diagnose the problems is sparse and shown in different applications. Operators time is wasted in debugging and checking for the source of the problem before trying another injection. A new Software application for diagnostics of the LHC Filling is under development which collects data from multiple inputs of the CERN Control System and concentrates them in one central view. The inputs are processed and matched with a set of rules (or assertions) that need to be fulfilled for an injection to be successful. Whenever a problem occurs, the operator can check the Filling Diagnostic for hints on what is the source of the problem during the injection. Filling Diagnostic also produces statistics of the LHC injections and the causes of failed injections, this will allow significantly better analysis of the LHC performance for next year.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK088  
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TUPIK115 Control System Developments for the Diamond Light Source DDBA Upgrade controls, feedback, storage-ring, vacuum 1996
 
  • W.A.H. Rogers, M.G. Abbott, K.A.R. Baker, N.W. Battam, M.J. Furseman, I.J. Gillingham, P. Hamadyk, M.T. Heron, D.G. Hickin, S.C. Lay, I.P.S. Martin, A.J. Rose
    DLS, Oxfordshire, United Kingdom
  
  Upgrading one Double Bend Achromat cell to a Double Double Bend Achromat (DDBA) cell in the Diamond Light Source storage ring* necessitated a broad range of changes to the overall control system. These changes covered developments to the interface layer of the controls system to incorporate changes to the underlying instrumentation, associated development of user interface, changes to real-time feedback and feed-forward processes and to the online accelerator model. Given the pressures to minimise the shutdown length, the control system developments were optimised for time effective installation and commissioning. This paper outlines the control system developments for DDBA, the management process and lessons learnt from this process.
* R.P. Walker et al., The Double-Double Bend Achromat (DDBA) Lattice Modification for the Diamond Storage Ring, Proc. IPAC 2014, MOPRO103, (2014) 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK115  
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TUPVA106 Solvements of the Asynchronization between the Bpms and Corrector Power Supplies in RCS of CSNS* EPICS, hardware, injection, power-supply 2339
 
  • M.T. Li
    CSNS, Guangdong Province, People's Republic of China
  • Y.W. An, Y.D. Liu
    IHEP, Beijing, People's Republic of China
  
  Funding: Work supported by the National Natural Science Foundation of China ( Grant No. 11405189)
This paper studies the possible solvements of the asyn-chronization between the BPMs and Corrector Supplies in RCS of CSNS, to increase the accuracy of the response matrix measurement and the obit correction. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA106  
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WEPAB101 Lattice Optimization Using Jupyter Notebook on HPC Clusters Linux, lattice, Windows, operation 2818
 
  • H. Nishimura, K.M. Fernsler, S. James, G.M. Jung, Y. Qin, K. Song, C. Sun
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the Director Office of Science of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231
Tracy accelerator simulation library was originally developed for the Advanced Light Source (ALS) design studies at LBNL in the late 1980's. It was originally written in Pascal, later ported to C++, and then to C#. It is still actively updated and currently used by the ALS Upgrade Project (ALS-U) to design and to optimize the lattice. Recently, it has been reconstructed to provide ease of use and flexibility by leveraging the quickly growing Python language. This paper describes our effort of porting it to Jupyter Notebook on our institutional High-Performance Computing (HPC) clusters. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB101  
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WEPAB121 Database for NSLS-II Accelerator Operation database, interface, operation, controls 2854
 
  • J. Choi, R.I. Farnsworth, T.V. Shaftan, G.J. Weiner, X. Yang
    BNL, Upton, Long Island, New York, USA
  
  Funding: DOE Contract No: DE-SC0012704
NSLS-II is employing a database and corresponding user interfaces which are used for the accelerator data sharing and management. The database include operation related information such as beam optics parameters, magnet measurement data, survey data and operation summary. To improve the usability, other functionalities are also being added. However, due to the limited scope, the general expectation of the overall facility cannot not be met and, in order to solve the issue, we are in the process of adopting Component Database (ComponentDB) developed at Advanced Photon Source (APS). This paper shows the current status of the process. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB121  
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WEPIK080 Preliminary Study of Beam Dynamics Compensation for the Elliptically Polarized Undulator at the HLS-II electron, simulation, undulator, dynamic-aperture 3114
 
  • Z.H. Yang, Z.H. Bai, W. Li, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  An elliptically polarized undulator (EPU) was installed at the upgraded Hefei Light Source, HLS-II, for special users. Due to that the area of good field of the EPU is not large enough, the resulting beam dynamics is serious. At present, the lattice is changed to lower beta functions at the EPU to solve this problem. However, the compensation for the EPU is necessary for better operation of the machine in the future. In this paper, we used the surface fitting method to extract the Hamiltonian of the EPU from the real surface magnetic field data. Thus, we can obtain the effective Hamiltonian of the ring, which can be analyzed using normal form or other techniques. Then the beam dynamics effects resulting from the EPU can be compensated by optimizing the nonlinear quantities with striplines.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK080  
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WEPVA075 Labview-Based Software for Electron Gun Controller controls, electron, LabView, gun 3439
 
  • Z.X. Shao, H. Gao, W. Liu, C.Y. Pan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by the National Science Foundation of China (No: 21327901)
Instrument control can improve measurement level of automation. In the actual control of the accelerator electron gun, we need to obtain a voltage with different amplitudes for the filament. Boost and voltage regulator modules should be used in the 220V AC input conditions. In order to adjust the filament voltage and stabilize the filament current more convenient, we developed a control software based on LabVIEW. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA075  
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WEPVA081 Topology Optimization for a Superconducting Cyclotron Main Magnet cyclotron, proton, extraction, target 3446
 
  • L.G. Zhang, K. Fan, S. Hu, L.X.F. Li, Z.Y. Mei, B. Qin, Z.J. Zeng
    HUST, Wuhan, People's Republic of China
  • W. Chen
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
  
  Main magnet is the heaviest component in a superconducting cyclotron, which occupies a large amount of cost. Topology optimization method is implanted to minimize the weight of main magnet while keep the field performance, which will make significant economic benefit. Due to the powerful superconducting coils, the main magnet is driven into saturation, and the nonlinear effect of the material must be considered. If the ordinary standard density method is used for the main magnet structure optimization, the nonlinear B-H relation have to be interpolated and the sensitivity analysis is very complicated. In this paper, a proper 2D model is established and the optimization formulation is given using standard density method. Then, the optimized topology of the main magnet for a 250MeV superconducting proton cyclotron is designed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA081  
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WEPVA106 A Consolidation Roadmap for the CERN Power Converters controls, hardware, operation, experiment 3514
 
  • D. Nisbet, J.-P. Burnet
    CERN, Geneva, Switzerland
  
  At CERN the Electrical Power Converter group is re-sponsible for the design and exploitation of more than 5000 power systems throughout the accelerator complex, powering predominantly magnet circuits, in addition to RF and electro-static systems. Currently, a variety of systems are in operation, in some cases these are over 30 years old. Furthermore, the group must maintain operationally a total of six hardware platforms, each with dedicated software. In light of this, a consolidation roadmap has been determined to rejuvenate the power converter complex and to reduce the total number of control platforms. This paper presents a summary of the CERN power converter equipment to be consolidated, and the roadmap to achieve consolidation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA106  
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THPAB011 Optimization of Multicell Microwave Cavities Using YACS cavity, controls, dipole, multipole 3708
 
  • B.D. Isbarn, B. Riemann, M. Sommer, T. Weis
    DELTA, Dortmund, Germany
  
  Funding: Work supported by the BMBF under contract no. 05K13PEB.
YACS is a 2.5D finite element method solver capable of solving for the full 3D eigenfrequency spectra of resonant axisymmetric structures while reducing the computational problem to a 2D rotation plane. The most recent revision of the code introduced arbitrary order basis functions and curved meshes, for both triangular and quadrilateral unstructured meshes. This led to significant increases in convergence rates. However, due to the utilization of curved meshes and the complex coordinate transformations that are involved, spurious modes were introduced when solving the axisymmetric problem. Although workarounds do exist that circumvent these issues by lowering the likelihood and frequency of spurious modes, linear triangular meshes with higher order basis functions were chosen due to their simplicity and spurious free solutions. In order to support the usage of spline cavities as an alternative parameterization to the well known elliptical cavities, parameter space scans were carried out for non-reentrant spline cavities. In addition a new optimization strategy is presented that exploits the arbitrary polynomial order of Bézier curves by utilizing the degree elevation technique. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB011  
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THPAB016 Investigation on the Ion Motion Towards Clearing Electrodes in an Accelerator ion, electron, simulation, linac 3723
 
  • G. Pöplau
    COMPAEC e.G., Rostock, Germany
  • A. Meseck
    HZB, Berlin, Germany
  
  High brightness beams provided by linac-based accelerators require several measures to preserve their high quality and to avoid instabilities, where the mitigation of the impact of residual ions is one of these measures, in particular if high repetition rates are aimed for. Over the last decade three ion-clearing strategies: clearing electrodes, bunch gaps and beam shaking have been applied to counteract the degrading impact of the ions on the electron beam. Currently, their merit as clearing strategies for next generation high brightness accelerators such as energy recovery linacs (ERLs) are under intensive investigations with both simulations and measurements. In this paper, we present numerical studies for the behavior of ions generated by electron bunch passages within the field of electrodes. The objective is to investigate the ion motion towards the electrodes and to study under which circumstances and up to which ratio, equilibrium between ion generation and ion-clearing is established. Hereby several ion species and shapes of electrodes are considered with typical parameters of future high current linacs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB016  
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THPAB052 Recent Developments in DEMIRCI, the RFQ Design Software rfq, simulation, ion, multipole 3830
 
  • E. Celebi
    Bogazici University, Bebek / Istanbul, Turkey
  • O. Cakir, G. Turemen, B. Yasatekin
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • G. Turemen, B. Yasatekin
    TAEK - SANAEM, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  
  Funding: This project has been supported by TUBITAK with project number 114F106.
The RFQ design tool DEMIRCI aims to provide fast and accurate simulation of a light ion accelerating cavity and of the ion beam in it. It is a modern tool with a graphical user interface leading to a point and click method to help the designer. This article summarizes the recent developments of DEMIRCI software such as the addition of beam dynamics and 8-term potential coefficient calculations. Its results are compared to other software available on the market, to show the attained compatibility level. Finally the future prospects are discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB052  
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THPAB118 Stabilization of Timing System Operation of J-PARC Linac and RCS timing, operation, linac, network 4000
 
  • H. Takahashi, N. Hayashi
    JAEA/J-PARC, Tokai-mura, Japan
  • Y.I. Itoh
    Total Support Systems Corporation, Tokai-mura, Naka-gun, Ibaraki, Japan
  • M. Kawase, Y. Sawabe
    Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
  
  At the timing system for J-PARC Linac and Rapid Cycling Synchrotron (RCS), the distribution of timing information (beam tag, type, etc.) and the monitoring and control of timing system are performed via the reflective memory (RFM). The more 10 years elapsed after operation start of J-PARC. Therefore, it is concerned about the occurrence of malfunctions due to time-related deterioration of the devices of timing system. Especially, the malfunctions of a management computer to monitor and control the all timing devices and RFMs to configure the timing system data network have a significant impact. Then, the management computer was renewed and PCI-Express RFMs are installed instead of PCI RFMs. However, after renewal computer, the trouble by data corruption of RFM network was happened anew. In this paper, the contents and the results our cause investigation of data corruption and those of the measures employed for stabilizing the timing system operation are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB118  
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THPAB121 The Study of Accelerator Data Archiving and Retrieving Software database, EPICS, interface, operation 4007
 
  • 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB121  
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THPAB137 New Approach in Developing Open XAL Applications interface, GUI, framework, controls 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, …).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB137  
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THPAB149 Characterization of the THz Radiation-Based Bunch Length Measurement System for the NSRRC Photoinjector radiation, laser, electron, detector 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB149  
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THPIK083 Mechanical Fabrication of ESS-Bilbao RFQ rfq, vacuum, cavity, linac 4279
 
  • J.L. Muñoz, I. Bustinduy, J. Martin, A. Ortega, I. Rueda, A. Zugazaga
    ESS Bilbao, Zamudio, Spain
  • M.A. Carrera, A. Garbayo
    AVS, Elgoibar, Spain
  
  The fabrication of the first segment of ESS-Bilbao's RFQ has started in 2016. The segment, of about 800 mm in length, is an assembly of 4 elements: two major vanes and two minor ones. The assembly will be done by making use of carefully-designed vacuum polymeric gaskets instead of brazing. Electron beam welding has been used during fabrication of the vanes. Apart from conventional CAD systems, a home-made tool for vane modulation solid generation has been successfully used. Machining process from copper blocks to final elements is described in detail. Also, the software tools created to assess the quality of the vanes by analyzing the metrology measurements, particularly of the modulation, are described in the paper. In order to test and validate the chosen vacuum strategy, an aluminum model using the same gaskets as the final model was built and tested. Results will also be presented. The fabrication of the first segment is expected to end up in early 2017, so assembly, segment alignment and vacuum tests with the real device will also be included in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK083  
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THPIK104 Transient Simulation of the ISIS Synchrotron Singlet Quadrupoles Using OPERA 3D quadrupole, simulation, synchrotron, proton 4334
 
  • I. Rodríguez
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  Type QX106 singlet magnets are AC defocusing quadrupoles used in the ISIS main synchrotron ring. They have an aperture of 202 mm and a yoke length of 303 mm, so the end effects are significant. The iron poles and the yoke are asymmetric and the coils are driven by a 50Hz, 400 A AC current, biased with a DC current of 665 A. Therefore the yoke has to be laminated, and the laminations are slitted up to a depth of 90 mm on each side to further reduce the eddy current losses. Two 3D models (DC and transient) have been developed using OPERA 3D for different purposes. Both models require the use of an anisotropic BH curve for the yoke, and the transient model also requires an anisotropic conductivity and a prismatic/hexahedral mesh to overcome the limitations of the linear tetrahedral edge elements in OPERA's vector potential formulation. The quadrupole field quality was originally measured in 1982 with a DC excitation at the biased peak current (1065 A) and those measurements are now compared to both models. The iron losses due to the eddy currents are also presented and compared to the original specifications defined in 1980, as well as an estimation of the eddy currents in the coils.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK104  
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THPVA078 The Beam Quality Assurance of the MedAustron Particle Therapy Accelerator framework, SRF, synchrotron, hardware 4634
 
  • L.C. Penescu
    Abstract Landscapes, Montpellier, France
  • A. De Franco, F. Farinon, M. Kronberger, C. Kurfürst, S. Myalski, S. Nowak, F. Osmić, M.T.F. Pivi, C. Schmitzer, P. Urschütz, A. Wastl
    EBG MedAustron, Wr. Neustadt, Austria
  • T.K.D. Kulenkampff
    CERN, Geneva, Switzerland
  
  The delivery of clinical beams for patient treatment at the MedAustron Ion Therapy Center requires extensive accelerator performance verifications, which are performed in several steps. In first instance, the key parameters of the beam delivered to the irradiation rooms (beam position, spot size, energy and intensity) are verified via measurements performed with beam diagnostic devices distributed along the accelerator. The second verification step consists in testing the full functionality of the therapy accelerator, including the medical frontend: scanning magnets performance, intensity monitoring and safety features. The final verification step is the quality assurance (QA) done by the medical department. An extended set of reference measurements assures the fast identification of the faulty components in case of a performance deviation, and the totality of the accumulated data allows in-depth analysis of the accelerator performance. We present here the trends and correlations observed during the first verification step for the most important parameters, as well as the lessons learned through all the implementation stages of the beam quality assurance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA078  
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THPVA093 Open XAL Status Report 2017 GUI, controls, site, interface 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA093  
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