Keyword: linac
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MOM308 XFEL Machine Protection System (MPS) Based on uTCA kicker, operation, undulator, FPGA 1
  • S. Karstensen, M.E. Castro Carballo, J.M. Jäger, M. Staack
    DESY, Hamburg, Germany
  For the operation of a machine like the 3 km long linear accelerator XFEL at DESY Hamburg, a safety system keeping the beam from damaging components is obligatory. This machine protection system (MPS) must detect failures of the RF system, magnets, and other critical components in various sections of the XFEL as well as monitor beam and dark current losses, and react in an appropriate way by limiting average beam power, dumping parts of the macro-pulse, or, in the worst case, shutting down the whole accelerator. It has to consider the influence of various machine modes selected by the timing system. The MPS provides the operators with clear indications of error sources, and offers the possibility to mask any input channel to facilitate the operation of the machine. In addition, redundant installation of critical MPS components will help to avoid unnecessary downtime. This paper summarizes the requirements on the machine protection system and includes plans for its architecture and for needed hardware components. It will show up the clear way of configuring this system - not programming. Also a look into the financial aspects (manpower / maintenance / integration) will be presented.  
slides icon Slides MOM308 [1.487 MB]  
MOPGF001 Use Interrupt Driven Mode to Redesign an IOC for Digital Power Supply at SSC-LINAC power-supply, controls, Ethernet, EPICS 1
  • S. An, K. Gu, X.J. Liu, J.Q. Wu, W. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
  SSC-LINAC control system is based on EPICS architecture. The sub control system of digital power supplies is a kind of IOC send and receive custom command via Ethernet and TCP/IP protocol. The old IOC is designed to use period scan mode IOC, and there are so many digital power supplies, that we can't make sure every connect condition of digital power supply is fine. IOC must wait a long time if one of them can't connect correctly and other digital power supply's PV may also be blocked. An IOC that uses interrupt driven mode to avoid the shortcoming was designed. This will be described in this paper.  
poster icon Poster MOPGF001 [0.853 MB]  
MOPGF014 LLRF Controls Upgrade for the LCLS XTCAV project at SLAC controls, LLRF, klystron, software 1
  • S. Condamoor, Y. Ding, P. Krejcik, H. Loos, T.J. Maxwell, J.J. Olsen
    SLAC, Menlo Park, California, USA
  Funding: This work was performed in support of the LCLS project at SLAC. Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
SLAC's Low Level Radio Frequency (LLRF) controls software for the S-Band deflecting structures needed to be upgraded significantly when a new X-Band transverse deflecting cavity (XTCAV) was installed downstream of the LCLS undulators in Spring 2013 to assist in FEL diagnostics such as characterizing the temporal profile of X-ray pulses that vary shot-to-shot. The unique location of the XTCAV in the beamline posed several challenges. A new design of the Modulator and Klystron control Support Unit (MKSU-II) for interlocking was added at the XTCAV controls station that required new software development. The timing setup was also different from the rest of the Linac. This paper outlines the LLRF controls layout for the XTCAV and discusses the manner in which the challenges were addressed. XTCAV has now become a successful tool for gathering data that enables reconstruction of X-ray FEL power profiles with greater resolution.
SLAC Publication Number: SLAC-PUB-16414
poster icon Poster MOPGF014 [3.646 MB]  
MOPGF029 Personnel Protection System Upgrade for the LCLS Electron Beam Linac operation, PLC, EPICS, hardware 1
  • C. Cyterski, E.P. Chin
    SLAC, Menlo Park, California, USA
  As facilities age and evolve, constant effort is needed in upgrading control system infrastructure; this applies to all aspects of an accelerator facility. Portions of the Personnel Protection System of the Linac Coherent Light Source are still relying on a legacy, relay-based Safety System. An upgrade is underway to modernize these systems using Siemens S7-300 Safety PLCs and Pilz PNOZMulti programmable controllers. The upgrade will be rolled out over multiple years requiring the implementation to be fully compatible with adjacent legacy system while setting the foundation for the new generation system. The solution relies on a modularized safety system which can be deployed in a short time (1 month) while being flexible enough to adapt to the evolving needs over the next 20 years.  
poster icon Poster MOPGF029 [0.274 MB]  
MOPGF038 Design and Commissioning Results of MicroTCA Stripline BPM System data-acquisition, software, electronics, hardware 1
  • S. L. Hoobler, R.S. Larsen, H. Loos, J.J. Olsen, S.R. Smith, T. Straumann, C. Xu, A. Young
    SLAC, Menlo Park, California, USA
  The Linac Coherent Light Source (LCLS) is a free electron laser (FEL) facility operating at the SLAC National Accelerator Laboratory (SLAC). A stripline beam position monitor (BPM) system was developed at SLAC [1] to meet the performance requirements necessary to provide high-quality stable beams for LCLS. This design has been modified to achieve improved position resolution in a more compact form factor. Prototype installations of this system have been operating in the LCLS LINAC and tested at the Pohang Accelerator Laboratory (PAL). Production systems are deployed at the new PAL XFEL facility and at the SPEAR storage ring at the Stanford Synchrotron Radiation Lightsource at SLAC. This paper presents the design and commissioning results of this system.  
poster icon Poster MOPGF038 [0.809 MB]  
MOPGF049 100Hz Data Acquisition in the TANGO Control System at the Max IV Linac TANGO, hardware, controls, electron 1
  • P.J. Bell, V.H. Hardion, V. Michel
    MAX-lab, Lund, Sweden
  The MAX IV synchrotron radiation facility is currently being constructed in Lund, Sweden. A linear accelerator serves as the injector for the two storage rings and also as the source of short X ray pulses, in which mode it will operate with a 100Hz repetition rate. The controls system, based on TANGO, is required to collect and archive data from several different types of hardware at up to this 100Hz frequency. These data are used for example in offline beam diagnostics, for which they must be associated to a unique electron bunch number. To meet these requirements, the timing performance of the hardware components have been studied, and a TANGO Fast Archiver device created. The system is currently in the deployment phase and will play an important role in allowing the linac and Short Pulse Facility reach their 100Hz design goal  
poster icon Poster MOPGF049 [17.953 MB]  
MOPGF079 European XFEL Cavities Piezoelectric Tuners Control Range Optimization cavity, operation, controls, LLRF 1
  • W. Cichalewski, A. Napieralski
    TUL-DMCS, Łódź, Poland
  • J. Branlard, Ch. Schmidt
    DESY, Hamburg, Germany
  The piezo based control of the superconducting cavity tuning has been under the development over last years. Automated compensation of Lorentz force detuning of FLASH and European X-FEL resonators allowed to maintain cavities in resonance operation even for high acceleration gradients (in range of 30 MV/m). It should be emphasized that cavity resonance control consists of two independent subsystems. First of all the slow motor tuner based system can be used for slow, wide range mechanical tuning (range of hundreds of kHz). Additionally the piezo tuning system allows for fine, dynamic compensation in a range of ~1 kHz. In mentioned pulse mode experiments (like FLASH), the piezo regulation budget should be preserved for in-pulse detuning control. In order to maintain optimal cavity frequency adjustment capabilities slow motor tuners should automatically act on the static detuning component at the same time. This paper presents work concerning development, implementation and evaluation of automatic superconducting cavity frequency control towards piezo range optimization. FLASH and X-FEL dedicated cavities tuning control experiences are also summarized.  
poster icon Poster MOPGF079 [0.932 MB]  
MOPGF114 Controls Interface into the Low-Level RF System in the ARIEL e-Linac at TRIUMF LLRF, controls, ISAC, interface 1
  • J.J. Pon, K. Ezawa, R. Keitel, R.B. Nussbaumer, J.E. Richards, M. Rowe, P.J. Yogendran
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  Phase 1 of TRIUMF Advanced Rare Isotope Laboratory (ARIEL) was completed in September 2014. At phase 1, the Low-Level RF (LLRF) system of ARIEL's electron linear accelerator (e-Linac) consists of a buncher and a deflector, one single-cavity injector cryomodule and the first cavity of two dual-cavity accelerating cryomodules. The model for the e-Linac LLRF system is largely based on the experience gained from the fully-commissioned TRIUMF ISAC-II linear accelerator (linac). Similarly, the EPICS-based Controls for the e-Linac LLRF builds on the lessons learned with the linac LLRF Controls. This paper describes the interface between the ARIEL Control System (ACS) and the e-Linac LLRF using EPICS ASYN/StreamDevice and a SCPI-like protocol. Also discussed are the ACS EDM displays and future plans for LLRF Controls.  
poster icon Poster MOPGF114 [3.428 MB]  
MOPGF121 Stripping Foil Displacement Unit Control for H Injection in PSB at CERN vacuum, controls, radiation, PLC 1
  • P. Van Trappen, R. Noulibos, W.J.M. Weterings
    CERN, Geneva, Switzerland
  For CERN's Linac4 (L4) Proton Synchrotron Booster (PSB) injection scheme, slices of the 160 MeV H beam will be distributed to the 4 superposed synchrotron rings of the PSB. The beam will then be injected horizontally into the PSB by means of an H charge-exchange injection system using a graphite stripping foil to strip the electrons from the H ions. The foil and its positioning mechanism will be housed under vacuum inside a stripping foil unit, containing a set of six foils that can be mechanically rotated into the beam aperture. The band with mounted foils is controlled by a stepping motor while a resolver, micro-switches and a membrane potentiometer provide foil position feedback. The vicinity of the ionizing beam and vacuum requirements have constrained the selection of the above mentioned control system parts. The positioning and interlocking logic is implemented in an industrial Programmable Logic Controller (PLC). This paper describes the design of the stripping foil unit electronics and controls and presents the first results obtained from a test bench unit which will be installed in the Linac4 transfer line by the end of the 2015 for foil tests with beam.  
poster icon Poster MOPGF121 [3.080 MB]  
MOPGF137 Interlock of Beam Loss at Low Energy Part of J-PARC Linac DTL, operation, detector, rfq 1
  • A. Miura, Y. Kawane, N. Kikuzawa, T. Maruta
    JAEA/J-PARC, Tokai-mura, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
  J-Parc linac has developed the output beam power by increasing of acceleration energy and the peak beam current. The beam loss is getting serious along with increasing the output beam power, however, the beam loss caused at the low energy part is difficult to detect due to the low energy radioactive emission. An interlock system has been developed to prevent from the sufficient material activation using the beam current monitors. In the system, an electrical circuit to take the beam transmission between two beam current monitors is newly designed and fabricated. This paper describes the performance of the electrical circuit and the system configuration will be introduced.  
MOPGF138 Overview and Design Status of the Fast Beam Interlock System at ESS interface, FPGA, operation, electronics 1
  • A. Monera Martinez, R. Andersson, A. Nordt, M. Zaera-Sanz
    ESS, Lund, Sweden
  • C. Hilbes
    ZHAW, Winterthur, Switzerland
  The ESS, consisting of a pulsed proton linear accelerator, a rotating spallation target designed for an average beam power of up to 5 MW, and a suite of neutron instruments, requires a large variety of instrumentation, both for controlling as well as protecting the different hardware systems and the beam. The ESS beam power is unprecedented and an uncontrolled release could lead to serious damage of equipment installed along the tunnel and target station within only a few microseconds. Major failures of certain equipment will result in long repair times, because it is delicate and difficult to access and sometimes located in high radiation areas. To optimize the operational efficiency of the facility, accidents should be avoided and interruptions should be rare and limited to a short time. Hence, a sophisticated machine protection system is required. In order to stop efficiently the proton beam production in case of failures, a Fast Beam Interlock (FBI) system with a targeted reaction time of less than 5 microseconds and very high dependability is being designed. The design approach for this FPGA-based interlock system will be presented as well as the status on prototyping.  
poster icon Poster MOPGF138 [2.412 MB]  
MOPGF153 Beam Instrumentation and Data Acquisition for CRYRING@ESR controls, ion, instrumentation, hardware 1
  • T. Hoffmann, H. Bräuning, R. Haseitl, R. Lonsing, P.B. Miedzik, T. Milosic, A. Petit, A. Reiter
    GSI, Darmstadt, Germany
  At FAIR the re-assembly of the well known CRYRING accelerator, formerly hosted by Manne Siegbahn Laboratory (MSL) Stockholm, is currently in progress. This compact low energy heavy ion synchrotron and experimental storage ring will be a testing platform for all control system (CS) concepts decided on for FAIR. The CRYRING CS will be based on the system originally developed by CERN which combines the JAVA based application level LSA (LHC Software Architecture) , the data acquisition level FESA (Front-End Software Architecture) and the White Rabbit based timing system. All parts have been enhanced with GSI specific functionality. In preparation for the commissioning of CRYRING later in 2015 all required beam instrumentation (BI) equipment including the software is now under development. The data acquisition (DAQ) concepts for the various instruments is presented, with emphasis on the seamless integration into the overall CS. For standard BI systems, such as digital imaging, profile and intensity measurement, VME and IndustryPC based DAQ systems are used. For beam position monitoring a new hardware strategy which combines the microTCA and FMC (FPGA mezzanine card) form factors is under evaluation.  
poster icon Poster MOPGF153 [2.028 MB]  
MOPGF162 MaRIE - Instrumentation & Control System Design Status and Options controls, undulator, electron, proton 1
  • M. Pieck, R.W. Garnett, F.E. Shelley, B.G. Smith
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by Los Alamos National Laboratory for the U.S. Department of Energy under contract W-7405-ENG-36. LA-UR-15-27877
Los Alamos National Laboratory has defined a new signature science facility, Matter-Radiation Interactions in Extremes (MaRIE) that builds on the existing capabilities of the Los Alamos Neutron Science Center (LANSCE). It will be the first multi-probe materials research center to combine high-energy, high-repetition-rate, coherent x-rays with electron and proton-beam charged-particle imaging to perform in-situ measurements of a sample in extreme environments. At its core, a 42-keV XFEL will be coupled with the LANSCE MW proton accelerator. A pre-conceptual design for MaRIE has been established. Technical risk reduction for the project includes an injector test-stand that is currently being designed. New accelerators are either planned, under construction, or currently in operation around the world, providing opportunities for the MaRIE project to leverage the instrumentation & controls (I&C) efforts of these facilities to minimize non-recurring engineering costs. This paper discusses possible MaRIE I&C system implementation choices and trade-offs, and also provides an overview of the proposed MaRIE facilities and the current design.
poster icon Poster MOPGF162 [0.399 MB]  
TUC3O06 Machine Protection System for the KOMAC 100-MeV Proton Linac ion, operation, proton, ion-source 1
  • Y.G. Song, Y.-S. Cho, D.I. Kim, H.S. Kim, H.-J. Kwon, K.T. Seol, S.P. Yun
    KAERI, Daejon, Republic of Korea
  Funding: This work has been supported through KOMAC operation fund of KAERI by MSIP(Ministry of Science, ICT and Future Planning)
A Machine Protection System (MPS) is one of the important systems for the 100-MeV proton linear accelerator of the Korea Multi-purpose Accelerator Complex (KOMAC). The MPS is required to protect the very sensitive and essential equipment during machine operation. The purpose of the MPS is to shut off the beam when the Radio-Frequency (RF) and ion source are unstable or a beam loss monitor detects high activation. The MPS includes a variety of sources, such as beam loss, RF and high voltage converter modulator faults, fast closing valves for vacuum window leaks at the beam lines and so on. The MPS consists of a hard-wired protection for fast interlocks and a soft-wired protection for slow interlock. The hardware-based MPS has been fabricated, and the requirement has been satisfied with the results within 3 μs. The Experimental Physics and Industrial Control System (EPICS) control system has been also designed to monitor and control the MPS using a Programmable Logic Controller (PLC). This paper describes the design and implementation of the MPS for the 100-MeV proton linear accelerator of the Korea Multi-purpose Accelerator Complex (KOMAC).
slides icon Slides TUC3O06 [12.865 MB]  
WEC3O04 New Event Timing System for Damping Ring at SuperKEKB timing, operation, positron, damping 1
  • H. Kaji, K. Furukawa, M. Iwasaki, T. Kobayashi, F. Miyahara, T.T. Nakamura, M. Satoh, M. Suetake, M. Tobiyama
    KEK, Ibaraki, Japan
  • Y. Iitsuka
    EJIT, Hitachi, Ibaraki, Japan
  • T. Kudou, S. Kusano
    Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
  • M. Liu, C.X. Yin
    SINAP, Shanghai, People's Republic of China
  SuperKEKB is the upgrade of KEKB, which is the world's largest luminosity accelerator at KEK. One of key items to realize 40 times larger luminosity than that of KEKB is damping ring (DR) for positron injection. The injector linac (LINAC) once stores the produced positrons into DR and suppress their emittance. Then low emittance positrons are extracted from DR and injected into the main ring. For this complicated injection process, the Event Timing System* for LINAC** was upgraded and its soundness is demonstrated by injecting electrons into two light source rings***. New Event modules were also installed under the Event network for LINAC as the sub timing system for DR. New Event modules were developed which can be operated with the different Event clock from that of upstream modules. It solves the difference in RF frequency between LINAC (2856MHz) and DR (509MHz). This sub timing system can manage the triggers towards totally 84 BPMs at DR although it consists of only 5 Event modules. The timing of those triggers can be independently set in more precise than 100ps. The requirements to DR timing system and the newly developed modules with its configuration at DR are explained.
*H. Kaji et al., THCOCA04, Proc. of ICALEPCS'13, San Francisco, CA.**H. Kaji et al., TUPRI109, Proc. of IPAC'14, Dresden, Germany.***Abstract submitted to IPAC'15.
slides icon Slides WEC3O04 [1.496 MB]  
WEPGF061 Beam Trail Tracking at Fermilab database, interface, software, booster 1
  • D.J. Nicklaus, L.R. Carmichael, R. Neswold, Z.Y. Yuan
    Fermilab, Batavia, Illinois, USA
  This paper presents a system for acquiring and sorting data from select devices depending on the destination of each particular beam pulse in the Fermilab accelerator chain. The 15 Hz beam that begins in the Fermilab Linac can be directed to a variety of additional accelerators, beam lines, beam dumps, and experiments. We have implemented a data acquisition system that senses the destination of each pulse and reads the appropriate beam intensity devices so that profiles of the beam can be stored and analyzed for each type of beam trail. It is envisioned that this data will be utilized long term to identify trends in the performance of the accelerators.  
poster icon Poster WEPGF061 [2.194 MB]  
WEPGF113 Physics Application Infrastructure Design for FRIB Driver Linac target, EPICS, controls, ion 1
  • G. Shen, Z.Q. He, M. Ikegami, D. Liu, D.G. Maxwell, V. Vuppala
    FRIB, East Lansing, Michigan, USA
  • E.T. Berryman
    NSCL, East Lansing, Michigan, USA
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
FRIB, which is a new heavy ion accelerator facility to provide intense beams of rare isotopes is currently under construction at Michigan State University. Its driver linac accelerates all stable ions up to uranium, and targets to provides a CW beam with the energy of 200MeV/u and the beam power of 400 kW. The beam commissioning of the driver linac has been planned to start from December 2017. A new infrastructure is under development using service oriented architecture for physics applications, which is a 3-tier structure consisting of upper level, middle layer, and low level respectively. The detailed design and its current status will be presented in this paper.
WEPGF120 Timing System at MAX IV - Status and Development timing, storage-ring, TANGO, controls 1
  • J.J. Jamroz, J. Forsberg, V.H. Hardion, V. Martos, D.P. Spruce
    MAX-lab, Lund, Sweden
  Funding: MAX IV Laboratory
A MAX IV construction of two storage rings (SR1.5GeV and SR3GeV) and a short pulse facility (SPF) has been proceeding over last years and will be finished in the middle of 2016. In 2014, few timing procurements were successfully finalized according to the MAX IV requirements and the installation works are ongoing along with the TANGO control system integration.
poster icon Poster WEPGF120 [0.721 MB]  
WEPGF122 Real-Time Performance Improvements and Consideration of Parallel Processing for Beam Synchronous Acquisition (BSA) EPICS, timing, real-time, operation 1
  • K.H. Kim, S. Allison, T. Straumann, E. Williams
    SLAC, Menlo Park, California, USA
  Funding: Work supported by the the U.S. Department of Energy, Office of Science under Contract DE-AC02-76SF00515 for LCLS I and LCLS II.
Beam Synchronous Acquisition (BSA) provides a common infrastructure for aligning data to each individual beam pulse, as required by the Linac Coherent Light Source (LCLS). BSA allows 20 independent acquisitions simultaneously for the entire LCLS facility and is used extensively for beam physics, machine diagnostics and operation. BSA is designed as part of LCLS timing system and is currently an EPICS record based implementation, allowing timing receiver EPICS applications to easily add BSA functionality to their own record processing. However, the non-real-time performance of EPICS record processing and the increasing number of BSA devices has brought real-time performance issues. The major reason for the performance problem is likely due to the lack of separation between time-critical BSA upstream processing and non-critical downstream processing. BSA is being improved with thread level programming, breaking the global lock in each BSA device, adding a queue between upstream and downstream processing, and moving out the non-critical downstream to a lower priority worker thread. The use of multiple worker threads for parallel processing in SMP systems is also being investigated.
poster icon Poster WEPGF122 [1.665 MB]  
WEPGF128 Development Status of the Sirius Timing System timing, injection, storage-ring, electron 1
  • J.L.N. Brito, S.R. Marques, L.A. Martins, D.O. Tavares
    LNLS, Campinas, Brazil
  Sirius is a new low-emittance 3 GeV synchrotron light source under construction in Brazil by LNLS, scheduled for commissioning in 2018. Its timing system will be responsible for providing low jitter synchronized signals for the beam injection process as well as reference clocks and triggers for diverse subsystems such as electron BPMs, fast orbit feedback and beamlines distributed around the 518 meters circumference of the storage ring, Booster and Linac. It will be composed of Ethernet-configured standalone event generators and event receivers modules developed by SINAP through a collaboration with LNLS. The modules will be controlled by remote EPICS soft IOCs. This paper presents the system structure and the status of the development, some options for integrating it to the Sirius BPM MicroTCA platform are also discussed.  
poster icon Poster WEPGF128 [13.921 MB]