Paper | Title | Other Keywords | Page |
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MOPRO086 | On-line Beam Control with Ocelot at Siberia-2 | controls, closed-orbit, dipole, simulation | 289 |
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Siberia-2 is a synchrotron light source with electron beam energy up to 2.5GeV, currently undergoing upgrade of controls hardware and software. Ocelot, an accelerator physics framework, was integrated with the new orbit correction system for high level beam control. We describe the steps taken for simulation studies of orbit correction strategies on a virtual machine model, integration of the software into the control system and experimental results. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO086 | ||
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MOPME012 | A New Tool for Automated Orbit and Spin Motion Analysis | lattice, experiment, storage-ring, simulation | 403 |
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There are a lot of tools to simulate beam dynamics in accelerators of various types. Many of them are intended to use for specific purposes, and there are universal codes that can simulate both orbit and spin motion in magnetic and electrostatic structures. To start using these codes beam physicist first should have learn syntax, know features and methods how to describe lattice and beams in this particular code. Output data structures of different simulation programs are also vary and depend on peculiarities of each program. This paper proposes a new tool for automated generation and execution of input files for simulation programs and for data analysis of output data. The developed tool allows to describe a lattice, calculate different lattice parameters (like tunes) using simulation program, track particles inside the lattice and analyze various parameters of output data (like beam depolarization). Simulations and analysis can be done in parallel using built-in parallelization mechanisms, and all results can be stored in the database and can be easily fetched when needed. The tool is used to simulate beam and spin dynamics in different lattices to increase spin coherence time. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME012 | ||
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MOPME031 | SolCalc: A Suite for the Calculation and the Display of Magnetic Fields Generated by Solenoid Systems | solenoid, GUI, superconductivity, interface | 445 |
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SolCalc is a software suite that computes and displays magnetic fields generated by a three dimensional (3D) solenoid system. Examples of such systems are the Mu2e magnet system and Helical Solenoids for muon cooling systems. SolCalc was originally coded in Matlab, and later upgraded to a compiled version (called MEX) to improve solving speed. Matlab was chosen because its graphical capabilities represent an attractive feature over other computer languages. Solenoid geometries can be created using any text editor or spread sheets and can be displayed dynamically in 3D. Fields are computed from any given list of coordinates. The field distribution on the surfaces of the coils can be displayed as well. SolCalc was benchmarked against a well-known commercial software for speed and accuracy and the results compared favorably. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME031 | ||
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MOPME046 | Supervision Software for the Integration of the Beam Interlock System with the CERN Accelerator Complex | operation, monitoring, hardware, linac | 476 |
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The Accelerator complex at the European Organisation for Nuclear Research (CERN) is composed of many systems which are required to function in a valid state to ensure safe beam operation. One key component of machine protection, the Beam Interlock System (BIS), was designed to interface critical systems around the accelerator chain, provide fast and reliable transmission of beam dump requests and trigger beam extraction in case of malfunctioning of equipment systems or beam losses. Numerous upgrades of accelerator and controls components during the Long Shutdown 1 (LS1) are followed by subsequent software updates that need to be thoroughly validated before the restart of beam operation in 2015. In parallel, the ongoing deployments of the BIS hardware in the PS booster (PSB) and the future LINAC4 give rise to new requirements for the related controls and monitoring software due to their fast cycle times. This paper describes the current status and ongoing work as well as the long-term vision for the integration of the Beam Interlock System software into the operational environment. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME046 | ||
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MOPME050 | Reliable Software Development for Machine Protection Systems | controls, framework, interface, feedback | 489 |
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The Controls software for the Large Hadron Collider (LHC) at CERN, with more than 150 millions lines of code, resides amongst the largest known code bases in the world. Industry has been applying agile software engineering techniques for decades now, and the advantages of these techniques can no longer be ignored to manage the code base for large projects within the accelerator community. Furthermore, CERN is a particular environment due to the high personnel turnover and manpower limitations, where applying agile processes can improve both, the codebase management as well as its quality. This paper presents the successful application of the agile software development process SCRUM for machine protection systems at CERN, the quality standards and infrastructure introduced together with the agile process as well as the challenges encountered to adapt it to CERN’s environment. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME050 | ||
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MOPRI006 | Possible Uses of Gamma-rays at Future Intense Positron Sources | undulator, positron, synchrotron, electron | 586 |
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Funding: This research is funded in part by STFC grant ST/G008248/1 The baseline design of the ILC (International Linear Collider) positron source requires the production of an intense flux of gamma rays. In this paper we present an investigation of using the gamma ray beam of the ILC for additional applications, including nuclear physics. As a result of changing the collimator shape, as well as the parameters of the undulator magnets, we obtained spectra from numerical simulations using the HUSR/GSR software package. We present results from simulations and a discussion of possible future investigations in this paper. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI006 | ||
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TUPRO018 | Prospects for the LHC Optics Measurements and Corrections at Higher Energy | optics, coupling, GUI, quadrupole | 1046 |
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LHC will resume operation in 2015 at 6.5 TeV. The higher energy allows for smaller IP beta functions, further enhancing the optics errors in the triplet quadrupoles. Moreover the uncertainty in the calibration of some quadrupoles will slightly increase due to saturation effects. The complete magnetic cycle of the LHC will take longer due to the higher energy and extended squeeze sequence. All these issues require more precise and more efficient optics measurements and corrections to guarantee the same optics quality level as in 2012 when a 7% peak beta-beating was achieved. This paper summarizes the on-going efforts for achieving faster and more accurate optics measurements and corrections. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO018 | ||
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TUPRO082 | Shape Optimization for the ESRF II Magnets | multipole, quadrupole, magnet-design, lattice | 1232 |
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Magnets are a keystone of the ESRF upgrade programme. The specifications of the magnets of the ESRF II lattice are stringent: high gradients, extended Good Field Region (GFR) and vertical gaps large enough for the X-ray beam ports. The magnet design approach is presented here. Shape optimization of the magnet poles is systematically used. The magnet design is treated as an ill-posed, non linear, constrained problem. Iterative algorithms have been developed; the algorithms converge in less than 10 iterations, leading to very short computation time. This design method has been applied to high gradient quadrupole magnets. The shape optimization leads to original pole profiles. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO082 | ||
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TUPRO110 | Analytic Methods of Simulating Magnetic Fields for the Taiwan Photon Source | dipole, multipole, simulation, photon | 1307 |
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Analytic methods of four kinds served for analysis of the magnetic field of TPS magnets that were simulated with OPERA 2D and 3D software. These analytic methods include fast Fourier transform, one-dimensional fitting, two-dimensional circular or elliptic fitting and a differential field. In this paper we discuss the precision of varied analytic methods for properties of a magnetic field in various situations. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO110 | ||
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TUPRI102 | Intervention Modelling at High-energy Particle Accelerators | radiation, simulation, target, software-tool | 1814 |
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Funding: This research project has been supported by a Marie Curie Fellowship of the European Community’s Seventh Framework Programme under contract number (PITN-GA-2010-264336-PURESAFE). An important aspect in the design and operation of high-energy particle accelerators is the planning of maintenance interventions. In the planning of these interventions, optimizing the exposure of the maintenance workers to ionizing radiation is a core issue. In this context, we have addressed the need for an interactive visual software tool. The intervention planning has been modelled mathematically. A proof-of-concept software tool has been implemented using this model, providing interactive visualization of facilities and radiation levels, tools for trajectory planning and automatic calculation of the expected integrated equivalent radiation dose. We explore the use of the software using a large experimental hall at CERN as a case study. Interactive visualization of the facilities and radiation levels, tools for interactive trajectory planning as well as automatic calculation of the expected integrated equivalent dose contracted during an intervention are explored. The obtained results prove the relevance of the developed methodology and software tool and demonstrate, among others, a better exploitation of the simulation data, leading to a potential accuracy gain. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI102 | ||
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TUPRI109 | Construction and Commissioning of Event Timing System at SuperKEKB | timing, linac, injection, positron | 1829 |
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The Event Timing System of Injector Linac at KEK is upgraded to satisfy the new requirements for the SuperKEKB project. After finishing the design and feasibility studies*, we have constructed the new system at Main Trigger Station of Linac. The new functions are developed in this system to perform the injection control of positrons with the newly constructed damping ring. Besides, we integrate the capability to adjust the trigger timing just 20 ms before injection so that the injection RF-bucket of the ring can be decided at the last minute. Now, both the new system and the current working system are operational at Main Trigger Station. This is important for the smooth taking over of Event Timing System. Even during the construction period, Linac must be operated to provide beams into the two light source rings. In this situation, we can carry out enough tests with the actual condition. These tests do not disturb the regular operation and brush up the Event Timing System to enable the quick startup of the SuperKEKB operation. We report about the detailed configuration of the new system and its commissioning performed in the 2014 spring run period.
* H. Kaji et al., "Upgrade of Event Timing System at SuperKEKB", proceedings of ICALEPCS13, San Francisco, USA, October 6-11, 2013. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI109 | ||
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WEPRO040 | Field Measurement Facility for PAL-XFEL Undulators | undulator, controls, FEL, laser | 2032 |
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Pohang Accelerator Laboratory (PAL) is developing the SASE based FEL for X-ray coherent photon sources. The PAL developed the prototype undulator that was 5.0 m magnetic length. The PAL has constructed the undulator field measurement facility to confirm the field qualities of the XFEL undulators in the assembly building. The temperature stability of the measurement rooms was controlled within ±0.1°C. Two field measurement benches that included Hall probe scan, flip coil and stretched wire system were installed and evaluated their performances. The field profile of the prototype undulator was characterized and shimmed using the installed measurement system. This paper described the field measurement facility with the performance test results of the two benches. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO040 | ||
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WEPRO076 | Constructing the ESS Linear Accelerator: Pragmatic Approaches to Design and System Integration at the European Spallation Source | interface, linac, hardware, proton | 2131 |
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The European Spallation Source (ESS) is a neutron science facility comprising a linear H+ accelerator, a tungsten target station, 22 neutron instruments, a suite of laboratories and a supercomputing data processing centre. The Accelerator project represents about a third of the total ESS construction budget and several European countries participate as in-kind contributing partners to it. It is crucial to guarantee requirements consistency, clarity of interface definition and proper space allocation. Potential functional and design inconsistencies must be promptly detected and actively resolved, bridging the project from the conceptual design towards a smooth, cost and time effective installation. Moreover, while the correct synergies are established and maintained, the organisational burden has to be minimized, aspect particularly relevant given the intrinsic prototypic nature of projects of this type. This paper describes the system architecture and the tools deployed to integrate the design of the ESS Linear Accelerator and to prepare for its installation. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO076 | ||
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WEPME038 | Introduction to the Latest Version of the Test-particle Monte Carlo Code Molflow+ | vacuum, simulation, injection, cryogenics | 2348 |
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The Test-Particle Monte Carlo code Molflow+ is getting more and more attention from the scientific community needing detailed 3D calculations of vacuum in the molecular flow regime mainly, but not limited to, the particle accelerator field. Substantial changes, bug fixes, geometry-editing and modelling features, and computational speed improvements have been made to the code in the last couple of years. This paper will outline many of these new features, and show examples of applications to the design and analysis of vacuum systems at CERN and elsewhere. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME038 | ||
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WEPRI095 | Modelling of a Short-period Superconducting Undulator | undulator, simulation, alignment, radiation | 2716 |
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STFC, in collaboration with Diamond Light Source, are designing and building a 15.5 mm period, 1.26 T superconducting undulator. This paper describes the modelling of the undulator, using Radia and Opera. Extensive numerical modelling has been carried out to simulate the effect of manufacturing tolerances on the quality of the magnetic field, in order to meet the demanding 3° rms phase error specification. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI095 | ||
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THPRO094 | Large Scale Particle Tracking and the Application in the Simulation of the RFQ Accelerator | rfq, simulation, emittance, space-charge | 3107 |
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Large scale particle tracking is important for the design and optimization of the Radio-frequency Quadrupole (RFQ) accelerator. In this paper, we present RFQ simulation results of new parallel software named LOCUS3D, which is developed at Institute of Software, Chinese Academy of Sciences. It is based on Particle-In-Cell method and calculates three-dimensional space charge field by an efficient parallel fast Fourier transform method. A RFQ accelerator in Tsinghua University is simulated by tracking 100 million macro particles. This RFQ is designed to accelerate protons from 50 keV to 3 MeV, with peak beam current of 50 mA. As large number of particles been simulated, more accurate and detailed information have been obtained. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO094 | ||
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THPRO106 | Developing Matlab-based Accelerator Physics Application for the ILSF Commissioning and Operation | controls, quadrupole, storage-ring, GUI | 3143 |
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The ILSF control system is supposed to operate with Epics system. The simultaneous use of Matlab Middle Layer (MML) and Accelerator Toolbox (AT) allow for parallel, high level machine control and accelerator physics application that communicate with control system via Epics via channel access. The MML has been papered for ILSF storage ring. Some high level applications are also tested in ILSF storage ring via MML. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO106 | ||
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THPRO107 | Application Programs of Elettra and FERMI@Elettra | controls, optics, booster, undulator | 3146 |
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At Elettra we have high level software application programs used on the ring and others, based on the TANGO control, a new High Level Framework and a beam optics module, firstly developed and successfully used for the commissioning and operation of the Elettra booster and now for FERMI@Elettra transfer lines. The paper describes the present status and some of the application programs. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO107 | ||
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THPRO110 | High Availability Software Architecture of C-ADS Control System | controls, database, EPICS, software-architecture | 3153 |
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The control system of Accelerator Driven Sub-critical System (ADS) should be a high-availability (HA) system with fault tolerant architecture, due to the potential utilizations of the ADS, such as separating and transmuting irradiated nuclear fuel. This paper discusses the HA software architecture of ADS control system which mainly composed by four softwares, which are 1) low floor communication and control system–-EPICS [1], 2) hierarchal programming framework of the accelerator–XAL [2], 3) monitoring and operating large scale control systems–Control System Studio (CSS) [1], 4) data storage and service infrastructure–HA database and server cluster. In addition, the recent development of ADS control system is briefly introduced in this paper. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO110 | ||
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THPRO115 | Control System Design Considerations for MYRRHA ADS | controls, EPICS, PLC, network | 3162 |
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The accelerator (ACC) is the first step of the accelerator driven system (ADS). A high power continuous wave ACC is required for ADS applications. An essential aspect of ACC is beam availability. It must be an order of magnitude better than current best systems. High availability is achieved by fault tolerance and redundancy of the ACC. Three factors play a key role here: use of components in a high MTBF regime, parallel and serial redundancy of components, ability to repair failing elements. In terms of ACC controls system (CS) EPICS and Linux is chosen as proven technology. High availability will be achieved through making parts of the CS redundant. Subsystems shall be redundant by design. If failure of a subsystem is detected, pre-defined scenarios should kick-in. System model or "virtual accelerator" can be implemented to predict effects of parameter change, determine required configuration of set points for optimal performance or re-configuration in case of sub-system failure. Implementation of predictive diagnostics can harvest large amount of data created by archiving service. Prediction of failure allows for controlled shutdown as opposed to abrupt stop. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO115 | ||
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THPME161 | Integration of Beam Diagnostics Devices for a Therapy Accelerator | timing, real-time, controls, beam-diagnostic | 3641 |
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MedAustron is a synchrotron based accelerator complex, used for cancer treatment as well as for non-clinical research, and is situated in Wiener Neustadt, Austria. Cosylab has been working closely with MedAustron to develop the core accelerator control system and is now also working on on-site integration of beam diagnostics (BD) devices. These devices are critical for commissioning of the accelerator as well as later during regular operation to ensure high up-time of the machine. Beam instrumentation devices are fully integrated into the Front End Controller Operating System (FECOS) of the accelerator. FECOS is a custom designed control system framework implemented in LabVIEW, which provides unified interfaces and core services to all software components in the system. The Master Timing System component provides configurable real-time events distribution (triggers), essential for measurement and control in sections where the beam is bunched and device actions need to be synchronized. Both companies, MedAustron and Cosylab also developed user interfaces that are designed to be intuitive, while maintaining a level of flexibility for physics research. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME161 | ||
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THPRI019 | Reliability and Availability Modeling for Accelerator Driven Facilities | simulation, operation, vacuum, linac | 3803 |
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Accelerator driven facilities are and will have to be designed to a very high level of reliability and beam availability to meet expectations of the users and experiments. In order to fulfill these demanding requirements on reliability and overall beam availability, statistical models have been developed. We compare different statistical reliability models as well as tools in terms of their performance, capacity and user-friendliness. In addition we also benchmarked some of the existing models. We will present in detail a tool being used for LHC and LINAC4 which is based on the commercially available software package Isograph and a tool using Excel, which was developed in house for ESS-systems. The impact of an early reliability modeling on the design of mission critical systems will be presented as well. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI019 | ||
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THPRI022 | The Accelerator Reliability Forum | HOM, operation, controls, instrumentation | 3813 |
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A high reliability is a very important goal for most particle accelerators. The biennial Accelerator Reliability Workshop covers topics related to the design and operation of particle accelerators with a high reliability. In order to optimize the over-all reliability of an accelerator one needs to gather information on the reliability of many different subsystems. While a biennial workshop can serve as a platform for the exchange of such information, the authors aimed to provide a further channel to allow for a more timely communication: the Particle Accelerator Reliability Forum (http://reliability.forumotion.com). This contribution will describe the forum and advertise it's usage in the community. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI022 | ||
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THPRI027 | Automated Conditioning System for Siemens Novel Electrostatic Accelerator | power-supply, vacuum, interface, controls | 3825 |
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Siemens has proposed a novel compact DC electrostatic tandem accelerator to produce protons of a few MeV and is currently commissioning a prototype at the Rutherford Appleton Laboratory. The geometry of the accelerator involves large surfaces which are exposed to high electric fields and therefore need long procedures for conditioning. An automated system for conditioning has been developed. It reacts quicker to breakdowns than a human operator could do, thus being more effective and also reduces the time spent by research staff on the conditioning. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI027 | ||
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THPRI028 | Acoustic Spark Localization for the 201 MHz RF Cavity | cavity, experiment, Windows, vacuum | 3828 |
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Funding: Work supported by U.S. Department of Energy Current designs for muon cooling channels require high-gradient RF cavities to be placed in solenoidal magnetic fields in order to contain muons with large transverse emittances. It has been found that doing so reduces the threshold at which RF cavity breakdown occurs. To aid the effort to study RF cavity breakdown in magnetic fields it would be helpful to have a diagnostic tool which can detect breakdown and localize the source of the breakdown inside the cavity. We report here on the experiment setup for localizing sparks in an RF cavity by using piezoelectric transducers and on preparation for data collection on a 201.25 MHz vacuum cavity. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI028 | ||
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THPRI097 | A Retrospective View to the Magnet Interlock Systems at CERN | PLC, operation, interlocks, linac | 4001 |
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Several thousands of both, superconducting and normal conducting magnets are in charge of guiding the particle beams in CERN’s accelerator complex. In order to protect the magnet and powering equipment from damage, dedicated magnet interlock and protection systems are deployed throughout the various accelerators and transfer lines. These systems have worked extremely well during the first years of LHC operation, providing highly dependable interlocking of magnet powering based on industrial COTS components. This paper reviews the performance of the more than 70 individual installations during the first LHC running period and compares the operational experience with the initial expectations of dependability. Additional improvements required to address specific operational needs and observed shortcomings are presented. Finally, we review the existing magnet interlock infrastructure in the LHC injector complex and the ongoing renovation works during the first long shutdown. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI097 | ||
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