Keyword: interface
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MOPMR018 Beam Position Monitor for Circular Proton Accelerators hadron, controls, instrumentation, closed-orbit 267
 
  • M. Žnidarčič, E. Janezic
    I-Tech, Solkan, Slovenia
  • K. Lang
    GSI, Darmstadt, Germany
  
  Position monitoring, tune calculation and subsequent optimization of hadron circular accelerators requires specific instrumentation. Libera Hadron is the newly developed instrument intended for data acquisition and post processing of signals from shoe-box or capacitive type pickups. Development, initial measurements and verification of the instrument performance were conducted in the Instrumentation Technologies' laboratories, followed by the characterization measurements of the unit carried out at Facility for Anti-proton and Ion Research (FAIR) facility. This article discusses the new BPM electronics concept, the tests performed and the performance obtained.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR018  
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MOPMW043 Overview of High Power Vacuum Dry RF Load Designs vacuum, linac, klystron, accelerating-gradient 504
 
  • A.K. Krasnykh, A. Brachmann, F.-J. Decker, T.J. Maxwell, J. Sheppard
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by US Department of Energy under contract DE-AC02-76SF00515
A specific feature of RF linacs based on the pulsed traveling wave (TW) mode of operation is that only a portion of the RF energy is used for the beam acceleration. The residual RF energy has to be terminated into an RF load. Higher accelerating gradients require higher RF sources and RF loads, which can stably terminate the residual RF power. This overview will outline vacuumed RF loads only. A common method to terminate multi-MW RF power is to use circulated water (or other liquid) as an absorbing medium. A solid dielectric interface (a high quality ceramic) is required to separate vacuum and liquid RF absorber mediums. Using such RF load approaches in TW linacs is troubling because there is a fragile ceramic window barrier and a failure could become catastrophic for linac vacuum and RF systems. Traditional loads comprising of a ceramic disk have limited peak and average power handling capability and are therefore not suitable for high gradient TW linacs. This overview will focus on 'vacuum dry' or 'all-metal' loads that do not employ any dielectric interface between vacuum and absorber. The first prototype is an original design of RF loads for the Stanford Two-Mile Accelerator. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW043  
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MOPMY013 Design Study of Collector for CEPC 650 MHz Klystron gun, klystron, simulation, operation 540
 
  • S.C. Wang, D.D. Dong, S. Fukuda, G. Pei, O. Xiao, .. Zaib-un-Nisa, Z.S. Zhou
    IHEP, Beijing, People's Republic of China
  • S. Fukuda
    KEK, Ibaraki, Japan
  
  This paper presents the design and simulation of collector for CEPC 650 MHz high-power CW klystron. Power dissipation in collector is optimised by universal beam spread curve using EGUN code, and beam trajectory in collector is verified by Magic code. The thermal analysis is done by ANSYS-CFX, and groove number and water flow rate are optimized by fluid-solid coupled heat transfer simulation.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY013  
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MOPMY030 SOSDAQ - a Data Acquisition and Slow Control System for the Swiss Light Source 500 MHz 65 Kw Solid State Power Amplifier controls, distributed, network, monitoring 560
 
  • M.A. Gaspar, T. Garvey
    PSI, Villigen PSI, Switzerland
  
  The Paul Scherrer Institut has developed a compact 500 MHz - 65 kW solid state RF power amplifier intended for applications in booster and storage rings of modern synchrotron light sources. The solid state power amplifier is presently under evaluation in the booster ring of the Swiss Light Source (SLS). In order to achieve this high RF output power levels using the present state of the art solid state technology, a large number of power amplifier modules, each one including its own power amplifier module and a local monitoring and control, are combined, configuring a complete distributed system. In order to monitor and control this large distributed system, we developed a specific data acquisition, monitoring and control system, called SOSDAQ. This system offers flexibility for efficiency optimization, easy addition and replacement of components, easy configuration for different types of power and efficiency requirements, among other features. We will discuss about the control system architecture, the software and the hardware implementation, and the results obtained.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY030  
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MOPMY031 Development of a 500 MHz Solid-state RF Amplifier as a Combination of Ten Modules operation, status, rf-amplifier, factory 563
 
  • T.-C. Yu, F.-Y. Chang, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Z.K. Liu, C.H. Lo, C.L. Tsai, M.H. Tsai, Ch. Wang, M.-S. Yeh
    NSRRC, Hsinchu, Taiwan
  
  The recent development of semiconductor technology has proved that a solid-state RF amplifier is an attractive alternative high-power RF source for numerous accelera-tor applications. Because of the great redundancy and reliability of solid-state amplifiers present in many facili-ties worldwide, the development of a kW-level RF power per module using compact planar baluns has also been undertaken in NSRRC. Ten amplifier modules are com-bined to achieve stable output power 8 kW as an initial conceptual realization of a basic power unit within a combined network. This article describes each portion of the amplifier with the experimental results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY031  
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MOPOR002 Impedance Simulations and Measurements for ThomX Storage Ring impedance, simulation, wakefield, storage-ring 586
 
  • A.R. Gamelin, C. Bruni, V. Chaumat, D. Le Guidec, P. Lepercq, R. Marie
    LAL, Orsay, France
  
  Funding: Work is supported by ANR-10-EQPX-51, by grants from Région Ile-de-France, IN2P3 and Pheniics Doctoral School
ThomX is a compact Compton Backscattering Source (CBS) which is being built at LAL, Orsay, France. ThomX ring has a short circumference of 18 m and a design energy of 50 MeV. Due to the low energy of the beam and in order to avoid beam degradation it is important to evaluate the ring components impedance. A CST Particle Studio impedance simulation of the different components of the ring (BPM, bellows, optical chamber, etc.) is under way. It will be followed by a bench measurement of the longitudinal and transverse impedance using the coaxial wire method. This paper will detail the preliminary results of the ThomX storage ring impedance simulations and the measurement principle we will use. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR002  
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MOPOY038 Studies for Tuning Algorithm of Superconducting Cavity Amplitude and Phase in the RAON Accelerator cavity, linac, GUI, simulation 932
 
  • H. Jin, J.-H. Jang
    IBS, Daejeon, Republic of Korea
  
  The RAON accelerator utilizes the low energy and high energy superconducting linacs for the acceleration of the stable ion beams and the rare isotope beams. The low energy superconducting linac is composed of the quarter-wave resonator (QWR) and the half-wave resonator (HWR) cavities, and the high energy superconducting linac consists of two kinds of single-spoke resonator (SSR) cavities. In the beam commissioning, the tuning of these superconducting cavities is a significant issue to achieve the targeted beam energy and to avoid the deterioration of the beam quality. In this paper, we will present the tuning program based on the phase scan tuning algorithm for the superconducting cavity amplitude and phase in the RAON accelerator and describe the simulation results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY038  
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TUPMB034 Design and Manufacture of a Superconducting Solenoid for D-Line of J-PARC Muon Facility solenoid, operation, vacuum, radiation 1177
 
  • T. Semba, Y. Hagiwara, S. Kido, S. Nakajima, Y. Tanaka
    Hitachi Ltd., Ibaraki-ken, Japan
  • N. Kawamura, Y. Makida, Y. Miyake, H. Ohhata, K. Sasaki, K. Shimomura
    KEK, Ibaraki, Japan
  • N. Kurosawa
    KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
  • Y. Murata
    Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan
  • P. Strasser
    High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science (IMSS), Ibaraki, Japan
  
  A superconducting solenoid for J-PARC muon facility was newly designed and manufactured. High Energy Accelerator Research Organization (KEK) has been operating the J-PARC Muon Science Establishment (MUSE) since 2008. Among its four muon beam lines, the decay muon line (D-Line) has been extracting and providing surface muons and positive decay muons up to a momentum of 50 MeV/c for various users, utilizing a superconducting solenoid. The D-Line as well as the other J-PARC facility suffered severe damages from the earthquake on March 11, 2011. It necessitated rebuilding of the damaged superconducting solenoid. New design parameter of the solenoid is as follows: length of solenoid: 6 m, diameter of warm bore: 0.2 m, magnetic field of bore center: 3.5 T, rated current: 415 A, superconducting wire: NbTi/Cu, quench protection: quench back heaters. The six-meter-long solenoid consists of twelve pieces of 0.5-meter-long superconducting coils. The entire solenoid is forced-indirectly cooled by supercritical helium flow. This report describes the design and manufacturing process of the newly built superconducting solenoid for D-Line of J-PARC muon facility.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB034  
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TUPMR032 Initial Commissioning of the Rutherford Appleton Laboratory (RAL) Scaled Negative Penning Ion Source plasma, cathode, operation, space-charge 1314
 
  • D.C. Faircloth, S.R. Lawrie, T. Rutter, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  A new high duty factor, scaled Penning surface plasma source is being developed at RAL. This paper provides initial commissioning results. A stable high-current (up to 100 A) pulsed discharge is obtained, but the anode overheats, caused by poor thermal contact at elevated temperatures. The overheating anode yields a noisy discharge, with low output current, and makes high duty factor operation impossible. The performance of a thermal interface material for aperture plate (plasma electrode) cooling is detailed. An update on the cathode heaters is provided. The anode to source-body fit is analysed at different temperatures for different combinations of mechanical tolerances. This offers insights when compared to ISIS operational sources. A new anode with modified tolerance dimensions for improved fit is being manufactured and will be tested in June 2016.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR032  
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TUPMW030 Review of LHC On-line Model Implementation and of its Applications optics, quadrupole, operation, database 1505
 
  • T. Persson, J.M. Coello de Portugal, M. Fjellstrom, L. Malina, J. Roy, P.K. Skowroński, A. Szczotka
    CERN, Geneva, Switzerland
  • J.S. Moeskops
    RID, Delft, The Netherlands
  
  The online model of the LHC aims to provide an accurate description of the machine at any given time. In order to do so it extracts the current optics in the machine along with other crucial parameters. It also provides the functionality to match the measured orbit using virtual correctors and the measured beta functions using virtual quadrupoles. In this way an accurate effective model can be created. In order to facilitate the use of the online model a graphical user interface has been developed. In this article we describe the design of the online model and its application in different studies. We give examples how it has been used to predict the influence of changes before they were applied to the machine.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW030  
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TUPMY009 MuSim, a Graphical User Interface for Multiple Simulation Programs simulation, proton, electron, real-time 1559
 
  • T.J. Roberts, M.A.C. Cummings, R.P. Johnson
    Muons, Inc, Illinois, USA
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  
  MuSim is a new user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parametrized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer (with a slider to vary the transparency of solids), allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline, MAD-X, and MCNP; more coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today's standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today's technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY009  
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TUPMY033 Radiation of Charged Particle Flying into Chiral Isotropic Medium polarization, radiation, vacuum, plasma 1620
 
  • S.N. Galyamin, A.V. Tyukhtin
    Saint-Petersburg State University, Saint-Petersburg, Russia
  • A.A. Peshkov
    HIJ, Jena, Germany
  
  Funding: Work is supported by the Grant of the Russian Foundation for Basic Research (No. 15-32-20985).
In recent years, the interest to radiation of moving charged particles in media with chiral properties is connected with relatively new and prospective method for diagnostics of biological objects which uses the Cherenkov radiation ' Cherenkov luminescence imaging*. Optical activity (chirality, gyrotropy) is typical or biological matter and is caused by mirrorless structure of molecules. Contrary to such gyrotropic medium as magnetized ionospheric plasma, aforementioned media are isotropic. One distributed model describing the frequency dispersion of isotropic chiral media is Condon model. In this report, we continue the investigation performed in our previous paper** where we dealt with the field produced by uniformly moving charge in infinite chiral isotropic medium. Moreover, we perform generalization of early paper***, where the problem with half-space was considered in the specific case of slow charge motion. We present typical radiation patterns in vacuum area and corresponding ellipses of polarization which allows determination of the chiral parameter of the medium.
* Spinelli A.E. et al. // NIM A. 2011. V. 648. P. S310.
** Galyamin S.N. et al. // Phys. Rev. E. 2013. V. 88. P. 013206.
*** Engheta N., Mickelson A.R. // IEEE Trans. AP. 1982. V. 30. P. 1213.
 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY033  
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TUPOY014 PSI Gantry 3: Integration of a New Gantry into an Existing Proton Therapy Facility controls, proton, coupling, optics 1927
 
  • A. Koschik, C. Baumgarten, C. Bula, J.P. Duppich, A. Gerbershagen, M. Grossmann, V. Rizzoglio, J. Welte
    PSI, Villigen PSI, Switzerland
  
  Paul Scherrer Institute extends its proton therapy facility PROSCAN by a third gantry. It is delivered by Varian Medical Systems (VMS) as part of a joint research project. Gantry 3 is equipped with a cone beam CT and allows 360 degrees of rotation while occupying a 10.5 m diameter. The integration of a gantry into the existing PSI-system typically being designed for a complete Varian system is a challenging project, since also the certification is to be maintained. Especially the interfaces between the PROSCAN-control system and the one of Gantry 3 have been a major development. Gantry 3 is designed to deliver proton beam of up to 8 nA with an accuracy better than a mm, while having a high level of over-current protection. This comprises a new current monitoring unit, several levels of interlock controllers and a beam energy dependent intensity compensation concept. One challenge concerns the specified layer switching time of 200 ms, required to reduce the treatment time to enable for repainting. After technical commissioning, acceptance tests and hand over, the clinical commissioning is foreseen in the second half of 2016 with the first patient treatment in December 2016.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY014  
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TUPOY053 In-Kind Contributions: A Prosperous Model of Procurement for Large-scale Science Projects controls, vacuum, site, experiment 2017
 
  • R. Amirikas, P. Ghosh
    FAIR, Darmstadt, Germany
  
  The number of research infrastructures which are being built with significant amount of In-Kind Contributions (IKCs) from partners and stakeholders is on the increase. One of the main advantages of the utilization of IKCs in big science projects is to enable numerous partners with technological and scientific know-how participate directly in such projects. Thus, IKCs promote capacity building in technology and knowledge transfer of these partners. However, management and execution of IKCs are particularly challenging. The 2nd In-Kind Contributions Workshop (IKCW 2015) was organized by the Facility for Antiproton and Ion Research in Europe (FAIR) with the aim of sharing experiences on the procurement and management of large-scale international science projects through IKCs. This paper focuses on the analysis of the issues pertaining to how to best implement and execute IKCs from the initial phase of assignment until full delivery for both accelerator and experiments. Discussions held during IKCW 2015 are used to highlight these points further. The goal of this paper is to present the reader with a synopsis of the challenges and opportunities faced in procurement through IKCs.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY053  
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WEPMB005 Manufacturing of the IFMIF Series Power Couplers operation, vacuum, cavity, cryomodule 2122
 
  • H. Jenhani, N. Bazin, N. Berton, G. Devanz, P. Hardy, V.M. Hennion
    CEA/IRFU, Gif-sur-Yvette, France
  
  In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, a Linear IFMIF Prototype Accelerator (LIPAc) is presently under construction for the first phase of the project. Eight power couplers are needed for the cryomodule of LIPAc. After the validation of the two prototypes, the manufacturing of the Series Power Couplers was lunched. This paper will report the status of the manufacturing progress. It will also describe the acceptance tests in addition to the criteria adopted for these critical RF power units. The manufacturing imperfections and some finishing techniques used for the different parts will be also presented and discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB005  
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WEPMB011 ESS Medium and High Beta Cavity Prototypes cavity, HOM, coupling, cryomodule 2138
 
  • P. Michelato, A. Bellandi, M. Bertucci, A. Bignami, A. Bosotti, J.F. Chen, L. Monaco, R. Paparella, P. Pierini, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • C.G. Maiano
    DESY, Hamburg, Germany
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  • S. Pirani
    ESS, Lund, Sweden
  
  In the framework of the ESS activity in progress at INFN-LASA, we are designing and developing 704.42 MHz Medium (β=0.67) and High (β=0.86) beta prototype cavities plug compatible with the ESS cryomodule design. The cells of one Medium and one High beta cavity are fabricated with high quality CBMM Large Grain Niobium (480 mm dia. Ingot, RRR=300, sliced by Heraeus) while a Medium beta cavity is done with Fine Grain material for comparison. The prototype cavities will be produced by the firm Ettore Zanon S.p.A. under the supervision of INFN - LASA group.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB011  
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WEPMB024 Study on Nondestructive Inspections for Super-conducting Cavity cavity, cryogenics, survey, radiation 2174
 
  • H. Tongu, H. Hokonohara, Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Hajima, M. Sawamura
    JAEA, Ibaraki-ken, Japan
  • H. Hayano, T. Kubo, T. Saeki, Y. Yamamoto
    KEK, Ibaraki, Japan
  
  Funding: The work is supported by Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
We have been studying nondestructive inspections for super-conducting spoke cavities. The temperature mapping (T-map) and X-ray mapping (X-map) are powerful inspection methods to locate a hot spot during the vertical RF tests. There would be a defect under the hot spot and the defect may be the cause of a quench. Our XT-map system (a combined system of T-map and X-map) has a high resolution in space. Because the huge amount of sensor signals are multiplexed at a hi-speed scanning rate in the vicinity of the sensors, the small number of signal lines makes the installation process easy and reduces the system complexity. Our XT-map got useful results on finding a defect in vertical RF tests of International Linear collider super-conducting cavity. The XT-map system is useful as low cost nondestructive inspections for superconducting spoke cavity. The study will be reported. progresses will be reported. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB024  
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WEPMB048 Macros for Identification of Higher Order Modes Types, Their Transverse Shunt Impedance and Kick Factor HOM, cavity, higher-order-mode, damping 2220
 
  • Ya.V. Shashkov
    MEPhI, Moscow, Russia
  • A. Orlov
    NRNU, Moscow, Russia
  
  Funding: *Work supported by Ministry of Education and Science grant 3.245.2014/r
During the design studies of accelerating cavities one of the most time-consuming tasks is classification of the higher order modes (HOM) types. To automate the process of identification of HOM types special macros for CST Microwave studio was written. This article describes the programs algorithm of mode recognition and the results of the analysis on the example of single cell and 9 cell cavities. Macros for the calculation of the HOM transverse shunt impedance upon Q-factor values and kick-factor was also written.
Higher order modes, electrodynamic characteristics, macros 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB048  
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WEPMR050 Development of Web-based User Interface for Beam Status Monitoring of 100-MeV Proton Linac controls, EPICS, monitoring, database 2389
 
  • Y.G. Song, J.H. Kim
    KAERI, Gyeongbuk, Republic of Korea
  • Y.-S. Cho, H.-J. Kwon
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
  
  Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
The goal of web-based user interface is to create a user interface which makes it easy and efficient to operate the KOMAC facility. A web-based user interface for a beam status monitoring of the KOMAC 100 MeV linac and beam lines has been developed with accessing Experimental Physics and Industrial Control System (EPICS) Channel Access (CA) protocol and relational database. Web service is combined with EPICS CA protocol. As a result, a beam operator and user can monitor the beam status in real time by using a web browser of remote PC or wireless device. In this paper, we are describing the implementation of web-based user interface for a beam status monitoring of the KOMAC proton linac. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR050  
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WEPOR029 Concept of a Fire and Gas Safety System for Accelerators operation, radiation, detector, cryogenics 2729
 
  • M. Dole, S. Grau, D. Raffourt
    CERN, Geneva, Switzerland
  
  Today CERN's facilities are equipped with automatic smoke and gas detection systems. Upon smoke or gas leak detection, local safety actions are automatically performed and alarms indicating the location and type of danger are transmitted to the CERN Fire Brigade. The firefighters then size their intervention based on the information received. The increasing complexity, size and quantity of CERN installations drives safety systems to evolve in the direction of simplicity. Intuitive interfaces are required to cope with high turnover of firefighters, and the inherent multinational environment. Global overview of alarms and safety actions statuses are needed by firefighters to decide on the best strategy for intervention. In some emergency situations, it might be necessary to manually trigger remote actions. CERN is studying a new concept, inspired by French standards, where the detection and protection layers are separated and act independently, but provide a common interface. This paper presents an application of this concept for the SPS* accelerator. Detection, fire-compartment and evacuation zones are presented, as well as the architecture of the detection and protection layers.
*SPS: Super Proton Synchrotron 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR029  
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WEPOR045 PACMAN - the MedAustron Measurement Data Analysis Framework framework, GUI, data-analysis, software 2774
 
  • A. Wastl, A. Garonna, T.K.D. Kulenkampff, S. Nowak
    EBG MedAustron, Wr. Neustadt, Austria
  
  During the commissioning of the synchrotron-based MedAustron accelerator facility, the analysis and interpretation of data of various sources was required. A dedicated framework was developed to analyze the raw data provided by the accelerator control system (ACS). A tested and documented software core with a simple and standardized interface allows also non-programming professionals to easily base their applications on this framework which is essential to efficiently make progress in the dynamic environment of commissioning. This document presents the structure of the framework, the interface between the software core and higher level applications and gives an example using all framework levels.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR045  
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WEPOW040 Preliminary Beam Test for TPS Fast Orbit Feedback System feedback, power-supply, vacuum, electronics 2930
 
  • P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, C.Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  TPS (Taiwan Photon Source) is a 3 GeV synchrotron light source which had be successfully commissioning with SRF up to 500 Amp in 2015 and scheduled to open user operation in 2016. As most of the 3rd generation light source, the fast orbit feedback system would be adopted to eliminate various disturbances and improve orbit stability. Due to the vacuum chamber material made of aluminum with higher conductivity and lower bandwidth, extra fast correctors mounted on bellows will be used for FOFB correction loop and DC correction of fast correctors would be transferred to slow ones and avoid fast corrector saturation. This report summarizes the infrastructure of the FOFB and the preliminary beam test is also presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW040  
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WEPOW055 Bayesian Optimization of FEL Performance at LCLS FEL, controls, laser, electron 2972
 
  • M.W. McIntire, T.M. Cope, D.F. Ratner
    SLAC, Menlo Park, California, USA
  • S. Ermon
    Stanford University, Stanford, California, USA
  
  Funding: Research is supported by the U.S. Department of Energy under Contract No. DE-AC02-76SF00515.
The LCLS free-electron laser at SLAC is tuned via a huge number of parameters such as energy and magnet settings. Much of this tuning, including quadrupole magnet settings, is typically done by hand by the LCLS operators. In this paper we introduce an automated tuning system using Bayesian optimization, and describe its application to the optimization of noisy objectives such as FEL performance. We demonstrate with preliminary results from our implementation at LCLS that this system can improve both the speed of tuning procedures as well as the quality of the resulting solution. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW055  
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WEPOY039 GIOTTO: A Genetic Code for Demanding Beam-dynamics Optimizations electron, software, space-charge, gun 3073
 
  • A. Bacci
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • V. Petrillo
    Universita' degli Studi di Milano, Milano, Italy
  • M. Rossetti Conti
    Universita' degli Studi di Milano & INFN, Milano, Italy
  
  GIOTTO is a software based on a Genetic Algorithm (GA). Its development started in 2007 with a work published on NIMB (263, 2007, 488-496) and presented at PAC07 (THPAN031). When the parameters, defining an acceleration machine beam line, are strongly correlated in nonlinear way, the GAs are a powerful tool to coup with these difficulties. These conditions are typically generated by space-charge, as in the high brightness e-beam photo-injectors or when the Velocity Bunching compression technique (VB) is used. The power of GIOTTO is the adaptability to different cases, given by its own structure that permits to drive different external codes in series, the possibility to define a user dependent multi objective fitness function and function constraints on the beam dynamics, as well as the possibility to turn off the genetic optimization to perform statistical analysis (machine jitters). Up today it has been used in Thomson/Compton sources, ultra-short e-bunches generation by VB, focusing channel and dog-leg lines optimizations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY039  
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WEPOY044 Review of CPU and GPU Faddeeva Implementations timing, GPU, simulation, space-charge 3090
 
  • A. Oeftiger, R. De Maria, L. Deniau, K.S.B. Li, E. McIntosh, L. Moneta
    CERN, Geneva, Switzerland
  • A. Aviral
    BITS Pilani, Pilani, India
  • S. Hegglin
    ETH, Zurich, Switzerland
  • A. Oeftiger
    EPFL, Lausanne, Switzerland
  
  Funding: CERN, Doctoral Studentship EPFL, Doctorate
The Faddeeva error function is frequently used when computing electric fields generated by two-dimensional Gaussian charge distributions. Numeric evaluation of the Faddeeva function is particularly challenging since there is no single expansion that converges rapidly over the whole complex domain. Various algorithms exist, even in the recent literature there have been new proposals. The many different implementations in computer codes offer different trade-offs between speed and accuracy. We present an extensive benchmark of selected algorithms and implementations for accuracy, speed and memory footprint, both for CPU and GPU architectures. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY044  
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THPMW004 Conceptual Design for the HEPS Power Supply System power-supply, booster, controls, storage-ring 3540
 
  • F. Long, Y.P. Liu, X. Qi, Z.H. ZhenHua
    IHEP, Beijing, People's Republic of China
  
  The High Energy Photon Source (HEPS) requires more than 1600 power supplies with various kinds of power rating. The power supply system includes power supplies for the Booster, Transport, and Storage Ring. The power supply for the Booster is based on 2Hz sinusoidal dynamic current output with 1000ppm current tracking requirement. And the power supply performance requirements of 10ppm long-term current stability are much more rigorous than commercial power supplies. The paper shows the conceptual design of the power supply system for the HEPS and possible solutions to critical technical challenges.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW004  
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THPMW013 Development of PAL-XFEL Magnet Power Supply FPGA, power-supply, operation, status 3564
 
  • K.-H. Park, S.-H. Jeong, Y.-G. Jung, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  • W.S. Choi
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  
  All magnets and magnet power supplies (MPS) for PAL-XFEL had been installed at the site. The all MPSs had been tested with the magnets at the field. The total number of assembled MPSs was amounted to 688, which were grouped into nine categories by their power capacities in order to reduce the manufacturing cost and make maintenance easy. The general specifications for the MPS for the PAL- XFEL were summarized. The design configurations of the MPS were also explained to satisfy the given requirements such as the output current stability. The test results of performances of the MPSs for corrector magnets were described here.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW013  
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THPMY013 Laser-Beam Welding for a TPS Beam-Position Monitor laser, controls, vacuum, target 3679
 
  • Y.T. Huang, C.-C. Chang, J.-R. Chen, G.-Y. Hsiung, S-N. Hsu
    NSRRC, Hsinchu, Taiwan
  
  The TPS beam-position monitor has two feedthroughs in one flange structure. The hermetic seal was formed with laser-beam welding (LBW). Nd-YAG LBW was adopted to weld a button electrode with a feedthrough; CO2 LBW served for a feedthrough and a flange, Fig. 1. A robotic arm was used for Nd-YAG LBW so that it could accomplish the complicated geometry of the welded joint. Although the CO2 laser was not coordinated with a robotic arm, fixtures were made to implement a circular welded joint the same as welding the feedthrough into a flange. For not only Nd-YAG but also CO2 LBW, the cover gas is the major key that avoids oxidation from atmospheric oxygen and maintains shiny weld beads. Taguchi methods were exploited to find the appropriate parameters for the Nd-YAG pulsed laser, for instance, the laser power, pulse-filling time, frequency etc.. This paper presents the process and details of laser-beam welding of two types for a beam-position monitor.
Laser beam weld, Nd-YAG, CO2, POWER, filling time, beam position monitor 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY013  
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THPMY025 Mechanical Integration of the IFMIF-EVEDA Radio Frequency Quadrupole rfq, vacuum, site, alignment 3712
 
  • P. Mereu, E.A. Macri, M. Mezzano
    INFN-Torino, Torino, Italy
  • P. Bottin, E. Fagotti, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • D. Gex
    F4E, Germany
  
  The Linear IFMIF Prototype Accelerator, the high intensity deuteron linac compact demonstrator of the IFMIF machine, is in an advanced installation phase at BA site (Rokkasho, Japan), within a European-Japan collaboration coordinated respectively by F4E and JAEA. The RFQ (5 Mev, 130 mA) is an Italian in-kind contribution under the responsibility of INFN. Is it a 9,8 m-long structure made of 18 modules, pre-assembled in three parts. The various aspects of the RFQ integration inside the LIPAc are presented here, with details about the various functional services of the RFQ, the different interfaces with other sub-components of the linac and with the building and the structural validation through the seismic analysis. Some peculiar aspects related to the installation of the RFQ are also detailed (i.e. the handling tooling, precise positioning jigs).  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY025  
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THPOW027 Compact X-band Accelerator Controls for a Laser-Compton X-ray Source controls, laser, LabView, timing 3996
 
  • D.J. Gibson, G.G. Anderson, C.P.J. Barty, R.A. Marsh
    LLNL, Livermore, California, USA
  
  Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
LLNL's compact, tunable, laser-Compton x-ray source has been built around an advanced X-band photogun and accelerator sections and two independent laser systems. In support of this source, a complete integrated control system has been designed and built from scratch to provide access to the critical control points and continues to grow to simplify operation of the system and to meet new needs of this research capability. In addition to a PLC-based machine protection component, a custom, LabView-based suite of control software monitors systems including low level and high power RF, vacuum, magnets, and beam imaging cameras. This system includes a comprehensive operator interface, automated and expandable arc detection to optimize rf conditioning of the high-gradient structures, and automated quad-scan-based emittance measurements to explore the beam tuning parameter space. An overview of this system is presented, including the latest upgrades to FPGA-based hardware for the RF system controls. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW027  
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THPOY009 Control System of the C-Band Standing-Wave Accelerator for the Medical Application operation, linac, controls, monitoring 4104
 
  • H. Lim, D.H. Jeong, M.W. Lee, M.J. Lee, S.W. Shin, J. Yi
    Dongnam Institute of Radiological and Medical Sciences, Busan, Republic of Korea
  
  A control system has been developed for the 6 MeV C-band accelerator which will be used for the medical application. It is built in the PXI platform and implemented for the operation and the monitoring of sub-components by the LabView programs. To communicate with components in the RF noise environment and to send/store the various monitoring data to the storage server, the interface based on Ethernet is used and it allows the real-time monitoring and the safe and fast feed-back system. In order to achieve the beam stability < 3.3 %, the automatic frequency controller for the magnetron is implemented by the feed-back scheme using the frequency waveform data and the constant cavity temperature is controlled by the real-time monitoring and interlock. In addition, the dose rate and flatness are controlled by a monitor chamber. The interlock system is also designed to protect the patients and also linac components against the improper operation, largely radiation, the misbehavior of monitoring parameters, etc. The architecture and main features are described and operation results are reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY009  
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THPOY017 Design and Implementation of Embedded Applications with EPICS Support for Accelerator Controls EPICS, controls, operation, embedded 4122
 
  • Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  Low-cost credit-card size SBCs (single-board computer) are with small footprint, powerful in CPU performance and rich interfaces solution to widely adopted for educational purposes and also suitable for small scale embedded applications. The card-size SBCs have been applied for several applications with EPICS support at the TPS control system environment as auxiliary supports which are not suitable to use standard platform in existed control system due to economics, simplicity, specialty view points. The more efforts of several implemented applications are summarized in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY017  
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THPOY022 Database Development for NSLS-II Accelerator Data Management database, operation, status, lattice 4137
 
  • J. Choi, T.V. Shaftan
    BNL, Upton, Long Island, New York, USA
  
  Funding: DOE contract No: DE-SC0012704
NSLS-II is developing a database which will be used for the accelerator data management. The information related to the operation is the main target at this stage. Also, various documents are being collected to provide easy access and installing workflow management is under consideration. The database will have web-based interfaces to communicate with the users. This paper overviews the database structures and required functionalities. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY022  
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THPOY039 Development of an Analysis Framework for the Beam Instrumentation Interface to the Beam Interlock System at ESS neutron, electronics, proton, monitoring 4185
 
  • R. Andersson, E. Bargalló, A. Nordt
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is currently being built in Lund, Sweden. When it is fully operational in 2025, it will host the most powerful neutron spallation facility in the world. The high-power proton beam needs to be carefully controlled and monitored in order to avoid possible damage to the sensitive equipment. Some of the most critical inputs to the beam interlock system are the beam monitors, delivered by the beam instrumentation group at ESS. In case local protection systems along the accelerator do not foresee a loss of beam, the beam monitors are the last line of defence to stop the proton beam and avoid equipment damage and consecutive downtime. It is essential for the protection of the machine that the whole beam permit signal chain, from monitors to actuators, fulfills strict reliability requirements. This paper describes the role and importance of the beam monitors to correctly measure beam losses and interface with the beam interlock system. It also describes one of several reliability studies that are performed to develop appropriate interfaces in the beam permit signal chain.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY039  
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THPOY051 Upgrades to the SPEAR3 Single-Photon Bunch Measurement System timing, controls, EPICS, software 4223
 
  • T.M. Cope, S. Allison, W.J. Corbett, Y.H. Xu
    SLAC, Menlo Park, California, USA
  
  The SPEAR3 accelerator uses a Single Photon Time-Correlated Counting (TCSPC) system to accurately measure the time profile of electron bunches circulating in the storage ring. The detection hardware uses the PicoHarp 300 TCSPC processor module initially equipped with an available Hamamatsu H7360-01 photon counting head. The H7360-01 was later replaced with a PicoQuant Hybrid-06 PMA to decrease single-photon arrival time jitter. At the same time we adopted an EPICS-based TCSPC software package developed at DIAMOND for robust data acquisition and display. In this paper we report on recent beam profile measurements and upgrades to the data acquisition software system including installation of a local EPICS IOC for real-time access to the bunch profile from SLAC's centralized Accelerator Control Room (ACR). High-level operator interface and monitoring applications developed in Python are discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY051  
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