IPAC2013 - Classification: 06 Instrumentation, Controls, Feedback and Operational Aspects / T04 Accelerator/Storage Ring Control Systems

Paper	Title	Page
THPEA002	The Accelerator Control System at ELSA	3149
	D. Proft, F. Frommberger, W. Hillert ELSA, Bonn, Germany
	To fulfill the new requirements of the post-accelerator mode of the electron stretcher facility ELSA, a new computer control system was developed during the early 1990s. Providing capabilities to control and monitor the facility, it represents the top layer of a distributed control system composed of HP workstations, VME and field bus processors as well as linux based personal computer s. In addition to regular updates and improvements, the HP-UX operated part of the control system recently was ported to linux, so the outdated HP workstations could be replaced by a single linux PC. All reference values, for example the betatron tune or the extraction energy, can be specified using a window-based graphical user front end. They are directly computed to hardware compatible representations. Vice versa, measured beam parameters, e.g. the transversal beam emittance, are displayed for easy user access, allowing real time diagnostics. This abstraction layer allows for an intuitive approach to machine operation, requiring no detailed knowledge of the hardware implementation. In this contribution, the design principles and implementation at different layers of the control system are presented.

THPEA003	Use of FPGA-based Configurable Electronics to Calibrate Cavities	3152
	S. Schäfer, A. Klaus, H. Klingbeil, B. Zipfel GSI, Darmstadt, Germany U. Hartel, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany
	At the GSI Helmholzzentrum für Schwerionen-forschung GmbH the accuracy requirements for synchrotron rf cavities have strongly increased in the last years, especially for multi-harmonic operation. For heavy-ion acceleration the amplitude and phase have to be well adjusted over a whole machine cycle. In order to compensate small deviations induced by low-level rf components (LLRF) and transmission lines in the control paths, a calibration electronic (CEL) with a characteristic map was developed. It is a real-time module which is based on modern FPGA (Field Programmable Gate Array) technology and adaptable to special cavities with various physical dependencies (e.g. attenuation, dispersion, temperature drift, aging etc.). The hardware and software architecture of this CEL module are presented here.

THPEA004	Precise Verification of Phase and Amplitude Calibration by means of a Debunching Experiment in SIS18	3155
	U. Hartel, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany J. Grieser, D.E.M. Lens TU Darmstadt, RTR, Darmstadt, Germany H. Klingbeil, U. Laier, K.-P. Ningel, S. Schäfer, B. Zipfel GSI, Darmstadt, Germany
	Funding: Work supported by the GSI Helmholtzzentrum für Schwerionenforschung GmbH Several new rf cavity systems have to be realized for the FAIR synchrotrons and for the upgrade of the existing GSI synchrotron SIS18. For this purpose, a completely new low-level rf system architecture* has been developed, which is now used in SIS18 operation. Closed-loop control systems stabilize the amplitude and the phase of the rf gap voltages. Due to component imperfections the transmission and the detection of the actual values lead to systematic errors without countermeasures. These errors prohibit the operation of the rf systems over the whole amplitude and frequency range within the required accuracy. To compensate the inevitable errors, the target values provided by the central control system are modified by so-called calibration electronics*** modules. The calibration curves can be measured without the beam, but the desired beam behaviour has to be verified by experiments. For this purpose, a debunching scenario was selected as a SIS18 beam experiment that proved to be very sensitive to inaccuracies. In this contribution the results of this experiment are presented, showing for the first time at GSI by beam observation that the accuracy requirements are met based on predefined calibration curves. * “FAIR - Baseline Technical Report,” Volume 2, Accelerator and Scientific Infrastructure, (2006). Klingbeil et al.: Phys. Rev. ST Accel. Beams 14, 102802, 2011. * S. Schaefer et al., “Use of FPGA-based Configurable Electronics to Calibrate Cavities,” THPEA003, these proceedings.

THPEA006	!CHAOS Historical Engine	3158
	M. Mara, A. Paoletti Istituto Nazionale di Fisica Nucleare, Amministrazione Centrale, Frascati, Italy C. Bisegni, G. Di Pirro, L.G. Foggetta, G. Mazzitelli, A. Stecchi INFN/LNF, Frascati (Roma), Italy L. Catani, F. Zani INFN-Roma II, Roma, Italy
	!CHAOS is an INFN project aimed at creating the communication framework and the services needed for the definition of a new control system standard, mainly addressed to large experimental apparatus and particle accelerators. !CHAOS is under test at DAΦNE accelerator and has been developed to overcome the strong requirements throughput of new accelerators, like superB. One of the main components of the framework is the historical engine (HST Engine), a cloud-like environment optimized for the fast storage of large amount of data produced by the control system’s devices and services (I/O channels, alerts, commands, events, etc.), each with its own storage and aging rule. The HST subsystem is designed to be highly customizable, such to adapt to any desirable data storage technologies, database architecture, indexing strategy and fully scalable in each part. The architecture of HST Engine and the results of preliminary tests for the evaluation of performance are presented.

THPEA010	Design and Implementation of the Remote Control System of the Digital Magnet Power Supply of China Spallation Neutron Source	3167
	X. Wu, Y.C. He, J. Liu, C.H. Wang, J.C. Wang IHEP, Beijing, People's Republic of China
	The magnet power supplies of the China Spallation Neutron Source (CSNS) can be classified into three types: rapid cycling synchrotron (RCS) resonant power supplies, fast response power supplies and DC power supplies. All of the magnet power supplies are controlled by the intelligent controller called Digital Power Supply Control Module (DPSCM), which can regulate the current and voltage circuit. The DPSCM is developed by the power supply group. It has two RS232 communication interfaces. All the command setting and reading power parameters are transmitted by Modbus protocol. Therefore, we made the communication protocol based on Modbus RTU between the remote control system and the DPSCM. This paper introduces the design of the remote control interface to the DPSCM. We developed EPICS IOC applications and real-time database on MOXA embedded serial device DA710 and OPIs using Control System Studio (CSS) according to different kinds of the power supplies. We have tested the remote control system with these kinds of power supplies. The test result shows that the remote control system is stable and reliable and it can basically meet the requirements of power supply system and physicists.

THPEA011	WPF Based EPICS Server and its Application in CSNS	3170
	Y.L. Zhang, G. Lei IHEP, Beijing, People's Republic of China
	The control system of China Spallation Neutron Source(CSNS) is under construction based on EPICS. The Linac low level RF(LLRF) local control program running on a local control PC uses Windows Presentation Foundation( WPF) as its development tool and uses the C# codes to implement the functionality. The Linac LLRF control system is non-EPICS, so the Linac LLRF local variables can’t be accessed directly from EPICS. Therefore we need to port the Linac LLRF local control system to EPICS. This paper presents the WPF base EPICS server and its application in CSNS.

THPEA017	Based on Channel Archiver of EPICS to Realize SSC-LINAC System Efficiently Beam Tuning	3179
	S.Z. Gou, M. Yue, W. Zhang IMP, Lanzhou, People's Republic of China
	In order to improve running efficiency of accelerator, shorten the time of changing accelerator beam is key link and it should be considered how to accelerate the ion to specific energy quickly and accurately. We will discuss how to use years of heavy ion accelerator operation data to generate a set of virtual accelerator equipment data for specific ion and energy, load to all the accelerator equipment fast. EPICS provide Channel Archiver tools that can achieve and store data from the IOC equipment operation information. In this study, we use Archive Engine tool and Oracle to combine data acquisition function and data management function. Firstly store the Archive Engine acquisition data into Oracle database, and then according to the data to create accelerator system operation snapshot as the basis for beam tuning. The snapshot data includes all equipment state and parameters at special time in accelerator operating. When the ion is to be changed, related snapshot in Oracle database will be retrieved and loaded to all the equipment and to realize efficiently beam tuning.

THPEA018	Design of an Integrated Platform based on CSS and MATLAB for SSC-LINAC System Controlling and Data Analysis	3182
	M. Yue, S.Z. Gou, W. Zhang IMP, Lanzhou, People's Republic of China
	CSS is the abbreviation of Control System Studio and is widely used in particle accelerator experiments area. Based on Eclipse, it is a collection of tools which can display details of the PV, show alarm state, as well as the function of data browsers, archive engine and so on. CSS offers an integrated approach to build a control system. We have recently developed a control and monitor system for the SSC-LINAC system to control and monitor power supply, vacuum, high frequency, and other accelerator equipments. In the area of accelerator controlling, we often need to do some mathematical operations like Fourier transform of the monitored data to get some accuracy performances of interested equipments. Unfortunately, CSS cannot satisfy this requirement. It is well known that MATLAB plays very well in data process and provides many mathematical tools. If we can combine these two tools together, we can get better control strategy. In the presentation, we will discuss the design of this integrated platform to implement the display, control and data process.

THPEA019	A Method of Implementing HIRFL-CSR Chopper Controls	3185
	K. Gu, S. An, X.J. Liu, W. Zhang IMP, Lanzhou, People's Republic of China
	A method of implementing controls of chopper for HIRFL-CSR (Heavy Ion Research Facility of Lanzhou and Cooler Storage Rings) is introduced. This method is based on an ARM and DSP co-operation system. The control algorithm of this method is based on a data structure which is defined and implemented in the DSP module. Output data is created by the control algorithm and the actually pulse output is triggered by a timer which is achieved through a logic circuit actualized in a FPGA chip. The results show that the method is flexible and the control system matches the chopper regulating requirements.

THPEA020	The Design for Presetting Data Automatically in HIRFL Power Supply Control System	3187
	X.J. Liu, Y. Chen, K. Gu, A. Shi, J.Q. Wu, F. Yang, W. Zhang IMP, Lanzhou, People's Republic of China
	This article introduces the structure of power supply in HIRFL(Heavy Ion Research Facility in Lanzhou) and designs a program which can preset power supply data automatically. We use Labview which is produced by NI Corporation to read Excel, access the Oracle database and send the generated instructions to power supply controllers. This program brings great convenience to physicists. It is used in SSC(Separated Sector Cyclotron) power supply system. The result shows that we can preset data quickly and accurately.

THPEA021	A Platform Control System for 320 kV HV Platform	3189
	W. Zhang, K. Gu, J.Y. Li, X.J. Liu IMP, Lanzhou, People's Republic of China
	This article describes the platform control system applied to the Chinese Academy of 320KV HV platform for highly charged ions. This system is composed of the hardware and the software. The hardware is composed of the network controller based on ATmega128 core chip. Our control group has designed the network controller for controlling the different types of equipment on the platform. The control system achieves the reliability, stability control of the different types of equipment on the HV platform, and control of the network, improve operational efficiency. The software uses NI Corporation's LABVIEW to program user interface. We have established for the application modules of the network controller in the LABVIEW and realized the optimization of the network controller to configure and use. The platform control system has run three years in the 320KV HV platform.

THPEA022	The Remote Control System for LAPECR1	3192
	W.X. Zhou, F.Y. Lin, J.F. Luo, Y.Y. Wang, J. Yin, Y.J. Yu, D.T. Zhou IMP, Lanzhou, People's Republic of China
	In order to support the debug of LAPECR1(Lanzhou All Permanent Magnet ECR Ion Source No.1) which merely provides H⁺ beam for HIRFL(Heavy Ion Research Facility in Lanzhou), a control system was realized in November 2011. The control system is composed of some controllers, a control-software and Intranet which is established by a switch. All of the controllers can access to Intranet directly or through serial-switch. And the controllers of the HV power and motor were designed by us. A IPC(Industrial Personal Computer) could control all of the equipments through Intranet. For the software of the system, it is designed using C++. And it could show the important data in the form of spectrum for the purpose of analysis and debug. The control system can acquire data and send command from/to the corresponding equipment.

THPEA024	The Control System of the SDUV-FEL Test Facility	3195
	J.G. Ding, S.M. Hu, G.Y. Jiang, H.F. Miao, H. Zhao, H.J. Zhu SINAP, Shanghai, People's Republic of China
	At SINAP, the Shanghai deep ultraviolet FEL test facility (SDUV FEL) was integrated to test the FEL key technologies and principles. The facility was constructed based on the existed SINAP 100MeV LINAC with modifications of cathode gun replacement and magnet compressor segment increment, extension of the undulator section, and the seeded laser system. The control system of the facility has been developed which upgraded and extended from the existed LINAC control system. The system was integrated based on the EPICS toolkit, consists of several subsystems of magnet power supply control, timing, vacuum monitor, RF control, undulator gap adjustment, and machine protection system. In this paper, the SDUV FEL control system is introduced. Solutions of equipment control, hardware and software implementations, and system integrations are described in details.

THPEA028	Embedded EPICS Controller in Inserting Devices of SSRF	3204
	G.Y. Jiang SSRF, Shanghai, People's Republic of China G.H. Chen SINAP, Shanghai, People's Republic of China
	SSRF is the first homemade third-generation of synchrotron radiation light source in China. In the first stage of SSRF, 7 beamlines have been built. Among of them, 5 beamlines have used inserting devices (IDs) including both of wigglers and undulators. To support stable and long life beam, the control part of these IDs must focus on high stability and high precision. Thus, Simens PLC, which has been widely used in industrial control fields, was used as local device controllers to control the motors. About upper layer control, we adopted a kind of embedded EPICS controller to implement the control of correction coil power supplies and PLC. This embedded EPICS controller is based on a commercial Ethernet/Serial converter which running MontaVista linux as its operation system. Beyond this, EPICS IOC Core program and several kinds of device control drivers were integrated to it. After several months using, the whole system works stably. Details of the necessary integration work and operation performance will be discussed in this paper.

THPEA030	Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators	3207
	I. Rutkowski, K. Czuba, M. Grzegrzólka Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland D.R. Makowski, A. Mielczarek, P. Perek TUL-DMCS, Łódź, Poland H. Schlarb DESY, Hamburg, Germany
	Modern linear accelerators require high-precision RF field regulation of accelerating cavities. A critical component to achieve high-precision in the feedback loop a Low Level Radio Frequency (LLRF) controller is the vector modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design and performance of an improved vector modulator module (DRTM-VM2). It is constructed as Rear Transition Module (RTM). The module consists of digital, analog, diagnostic and management subsystems. FPGA from Xilinx Spartan 6 family receives data from control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier and fast RF gates for external interlock system. Pin assignment on the Zone3 connector is compliant with digital class D1.2 recommendations proposed by DESY. The design has been optimized for mass production and for easy extends to wider frequency range. Electronic switches offer software configuration of power and clock sources.

THPEA031	REGAE LLRF Control System Overview	3210
	I. Rutkowski, Ł. Butkowski Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland M. Hoffmann, H. Schlarb, Ch. Schmidt DESY, Hamburg, Germany
	The linear accelerator REGAE (Relativistic Electron Gun for Atomic Exploration) at DESY delivers electron bunches with a few femtosecond duration for time-resolved investigation of material structures in pump-probe configuration. To achieve sub-10fs resolution, the Low Level RF controls for the normal conducting S-band cavities must provide field stability of .005% in amplitude and of .005deg in phase. To achieve these demands, the recently developed LLRF control modules based on the Micro-Telecommunications Computing Architecture (MTCA.4) platform are used. For precise field detection and control a rear transition module (DRTM-DWC8VM1) housing 8 down-converters and 1 vector-modulator has been developed. The down-converted signals are transmitted to low-noise ADCs on an advanced mezzanine card (SIS8300L) with two high speed DACs driving the vector-modulator. The on board FPGA device runs the advanced control algorithms with minimum latency. Shot-to-shot learning feed forward and ultra-fast analog and digital feedbacks are applied. In this paper, the first results of the new RTM-AMC module pairs are presented together with the achievements and limitations on the RF field stability.

THPEA032	Software for Power Supplies Control of the NSLS-II Booster Synchrotron	3213
	P.B. Cheblakov, A.A. Derbenev, S.E. Karnaev, S.S. Serednyakov BINP SB RAS, Novosibirsk, Russia M.A. Davidsaver, Y. Tian BNL, Upton, New York, USA
	The booster synchrotron of the NSLS-II light source at Brookhaven National Laboratory (BNL) provides electron beam acceleration from 200 MeV up to 3 GeV in 300 ms. This imposes strict conditions on both accuracy of control and synchronization of ramping Power Supplies (PS). Hardware part of PS controls are based on electronics specially developed at BNL and includes Power Supply Controllers (PSC) and Power Supply Interfaces (PSI). The former represents digital part of hardware and implements low-level logic (generating ramp functions, simple data verification and data acquisition), communication with control system software and PSI. The latter is an analogue part of entire system and it performs generation and acquisition analogue and digital signals by a set of on-board DACs, ADCs and digital inputs/outputs. The PSC and the PSI are connected by digital fibre optic link for electrical decoupling. This paper describes software for the booster synchrotron PSs control which is based on EPICS and includes a specially designed electronics configuration, a set of programs to manage ramp functions and to control different types of power supplies, both pulsed and ramping.

THPEA033	Electronics for Precise Measurements of Accelerator Pulsed Magnets	3216
	A.V. Pavlenko, A.M. Batrakov, I.V. Ilyin BINP SB RAS, Novosibirsk, Russia
	Injection and extraction systems of modern accelerator complexes have high requirements for measurements accuracy of pulsed magnets field parameters. To satisfy these demands the fast and precision digital integrators were elaborated in BINP, Russia. These devices are intended for measurements in pulsed magnets (septum magnets, bumps, etc.) with the field duration, ranging from 5 μs, providing a relative accuracy better than 5•10^-5. The set of these devices are the main measuring electronics in injection and extraction section of 3 GeV Booster Ring at NSLS-II facility, which is under construction now in BNL (USA).

THPEA034	ESS Integrated Control System Integration Support and the Agile Methodology Proposal	3219
	M. Reščič Cosylab, Ljubljana, Slovenia L. Fernandez, A. Nordt ESS, Lund, Sweden
	The stakeholders of the ESS Integrated Control System (ICS) reside in four main parts of the ESS machine: accelerator, target, neutron instruments and conventional facilities. In order to maintain and support the standardized hardware and software platforms for controls all of the stakeholders' integration requirements and efforts must be strictly harmonized. This called for a decision by the ICS to perform the majority of the work in a package titled 'Integration Support', ranging from FPGA code development to EPICS integration. This exposes a high number of interfacing systems and devices and planning of such activities for each system make the standard waterfall planning model highly inefficient and risky. In order to properly address the planning risks the agile methodology is proposed - from product owners and teams to scrums and sprints, everything to offer a better and more efficient integration support to controls stakeholders.

THPEA038	ESS Naming Convention	3222
	K. Rathsman, G. Trahern ESS, Lund, Sweden J. Malovrh Rebec, M. Reščič, M. Vitorovic Cosylab, Ljubljana, Slovenia
	The European Spallation Source is an intergovernmental project building a multidisciplinary research laboratory based upon thermal neutrons. The main facility will be built in Lund, Sweden. Construction is expected to start 2013 and the first neutrons will be produced in 2019. The ESS linac will deliver 5 MW of power to the target at 2.5 GeV, with a nominal current of 50 mA. The ESS Naming Convention is based on a standard, originally developed for the Super Superconducting Collider (SSC) and later adopted by other large research facilities, e.g. the Spallation Neutron Source (SNS), Facility for Rare Isotope Beams (FRIB), International Thermonuclear Experimental Reactor (ITER), and the Continuous Electron Beam Accelerator Facility (CEBAF). The ESS Naming Convention was agreed upon and approved at a very early stage of the ESS project in order to establish a standard before names started to evolve. The main scope was to standardise meaningful, yet short and mnemonic signal and device names. The present paper describes the naming convention, the site wide implementation at ESS and associated web based tools.

THPEA050	Power Supply Control and Applications Development for the TPS Storage Ring Quadrupole and Sextupole Magnet	3258
	Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The TPS intermediate power supply for storage ring quadrupole and sextupole magnets with current rating 250 Amp will be equipped with Ethernet interface. The quadrupole power supply is 18bit with higher stability than sextupole with 16 bits, and have internal data buffer for post-mortem capability. The dedicated IOCs are built individually at the 24 cPCI platforms to manipulate the devices of the 24 cells of storage ring respectively. Each IOC is used to control 10 quadrupole magnet power supplies and 7 sextupole magnet power supplies. The GUIs of storage ring quadrupole and sextupole power supplies controls were implemented by the EDM toolkit. The client console can use the specific EDM pages to access power supplies via PVs channel access. The measured currents of quadrupole and sextupole power supplies were read back for observing performance. Some applications, like the degauss process, boot function and etc, are also developed with the specific toolkit. The efforts will be summarized at this report.

THPEA055	NESTOR Facility Control System	3267
	D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine
	The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA057	Compensation Schemes for Operation of FEL Wigglers on Duke Storage Ring	3270
	J.Y. Li, H. Hao, S.F. Mikhailov, V. Popov, W. Wu, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. The Duke FEL is the photon driver for the High Intensity Gamma-ray Source (HIGS). To extend the capabilities of the FEL and HIGS to higher photon energy regions, a FEL wiggler switchyard system was developed in the recent years. This system was installed and commissioned in 2012. The FEL wiggler switchyard is used to change between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section in a short period of time (a few days). With a total of six electromagnetic wigglers, the Duke FEL can be operated in a number of wiggler configurations and with a wide range of magnetic fields. The operation of uncompensated FEL wigglers can cause significant changes to the electron beam closed orbit and magnetic lattice. To maintain a sufficiently large dynamic aperture for an efficient injection and good beam lifetime, a set of complex compensation schemes, including magnetic field and lattice compensation, have been developed for the operation of the FEL wigglers. This paper reports the overall architecture and performance of the FEL wiggler compensation schemes and their implementation in the accelerator controls system using the feedforward mechanism.

THPEA059	Database for Accelerator Modeling	3273
	C.P. Chu, J. Wu SLAC, Menlo Park, California, USA D. Dohan, G. Shen BNL, Upton, Long Island, New York, USA H.H. Lv IHEP, Beijing, People's Republic of China Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. A database for model data is design for the Facility for Rare Isotope Beams (FRIB) Project. The database schema design takes most general approach and is not limited to FRIB models. Programmatically access to the database can be done through a set of Application Programming Interfaces (APIs). Initial data population demonstrates that the database is suitable for XAL application framework. The model database is also part of a collaboration for complete database needs among various domains across an accelerator.

THPEA060	LLRF System for LCLS-II at SLAC	3276
	Z. Geng, B. Hong, K.H. Kim, R.S. Larsen, D. Van Winkle, C. Xu SLAC, Menlo Park, California, USA
	Funding: Work supported by US Department of Energy Contract DE AC03 76SF00515 After LCLS-I successfully delivering the full operation for users, SLAC has been approved to build the second Linac Coherent Light Source, LCLS-II, which makes use of another third of the 2-mile long Linac from Sector 10 to Sector20. The LLRF System will use mTCA (Micro Telecommunication Computing Architecture) to replace the VME system for LCLS-II injector and some key stations along the LINAC. The faster data acquisition and more powerful FPGA and CPU in the mTCA system enable the LLRF system to extend its control ability to a 2.5 μsec beam pulse rate of 360Hz. The new LLRF system is more compact and has the capability of low latency intra-pulse feedback to reduce fast phase and amplitude jitter during a single pulse. The prototype of the mTCA based LLRF control system has been operating at RF station 28-2 in LCLS-I. Detailed design structure and the prototype experimental results will be presented that demonstrate the system meets the exacting phase and amplitude stability requirements for LCLS-II.

THPEA061	EPICS Accelerator Control System for the IAC-RadiaBeam THz Project	3279
	A. Andrews, B.L. Berls, T. Downer, C.F. Eckman, K. Folkman, Y. Kim, C. O'Neill, J. Ralph IAC, Pocatello, IDAHO, USA P. Buaphad, Y. Kim ISU, Pocatello, Idaho, USA
	The Idaho Accelerator Center (IAC) of Idaho State University has been operating a 44 MeV L-band linac for various nuclear physics related applications. However, for the past several years, this research has been done without the aid of a modern computer based control system. To obtain a better reproducibility and stability in operation, the EPICS accelerator control system has been applied to control various components of this linac. This has been done for the purpose of a joint THz research project between IAC and RadiaBeam that was performed in November 2012. This paper describes the development of the EPICS accelerator control system used during this joint THz research experiment.

Paper

Title

Page

The Accelerator Control System at ELSA

3149

D. Proft, F. Frommberger, W. Hillert
ELSA, Bonn, Germany

To fulfill the new requirements of the post-accelerator mode of the electron stretcher facility ELSA, a new computer control system was developed during the early 1990s. Providing capabilities to control and monitor the facility, it represents the top layer of a distributed control system composed of HP workstations, VME and field bus processors as well as linux based personal computer s. In addition to regular updates and improvements, the HP-UX operated part of the control system recently was ported to linux, so the outdated HP workstations could be replaced by a single linux PC. All reference values, for example the betatron tune or the extraction energy, can be specified using a window-based graphical user front end. They are directly computed to hardware compatible representations. Vice versa, measured beam parameters, e.g. the transversal beam emittance, are displayed for easy user access, allowing real time diagnostics. This abstraction layer allows for an intuitive approach to machine operation, requiring no detailed knowledge of the hardware implementation. In this contribution, the design principles and implementation at different layers of the control system are presented.

THPEA003

Use of FPGA-based Configurable Electronics to Calibrate Cavities

3152

S. Schäfer, A. Klaus, H. Klingbeil, B. Zipfel
GSI, Darmstadt, Germany
U. Hartel, H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany

At the GSI Helmholzzentrum für Schwerionen-forschung GmbH the accuracy requirements for synchrotron rf cavities have strongly increased in the last years, especially for multi-harmonic operation. For heavy-ion acceleration the amplitude and phase have to be well adjusted over a whole machine cycle. In order to compensate small deviations induced by low-level rf components (LLRF) and transmission lines in the control paths, a calibration electronic (CEL) with a characteristic map was developed. It is a real-time module which is based on modern FPGA (Field Programmable Gate Array) technology and adaptable to special cavities with various physical dependencies (e.g. attenuation, dispersion, temperature drift, aging etc.). The hardware and software architecture of this CEL module are presented here.

THPEA004

Precise Verification of Phase and Amplitude Calibration by means of a Debunching Experiment in SIS18

3155

U. Hartel, H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany
J. Grieser, D.E.M. Lens
TU Darmstadt, RTR, Darmstadt, Germany
H. Klingbeil, U. Laier, K.-P. Ningel, S. Schäfer, B. Zipfel
GSI, Darmstadt, Germany

Funding: Work supported by the GSI Helmholtzzentrum für Schwerionenforschung GmbH
Several new rf cavity systems have to be realized for the FAIR synchrotrons and for the upgrade of the existing GSI synchrotron SIS18*. For this purpose, a completely new low-level rf system architecture** has been developed, which is now used in SIS18 operation. Closed-loop control systems stabilize the amplitude and the phase of the rf gap voltages. Due to component imperfections the transmission and the detection of the actual values lead to systematic errors without countermeasures. These errors prohibit the operation of the rf systems over the whole amplitude and frequency range within the required accuracy. To compensate the inevitable errors, the target values provided by the central control system are modified by so-called calibration electronics*** modules. The calibration curves can be measured without the beam, but the desired beam behaviour has to be verified by experiments. For this purpose, a debunching scenario was selected as a SIS18 beam experiment that proved to be very sensitive to inaccuracies. In this contribution the results of this experiment are presented, showing for the first time at GSI by beam observation that the accuracy requirements are met based on predefined calibration curves.
* “FAIR - Baseline Technical Report,” Volume 2, Accelerator and Scientific Infrastructure, (2006).
** Klingbeil et al.: Phys. Rev. ST Accel. Beams 14, 102802, 2011.
*** S. Schaefer et al., “Use of FPGA-based Configurable Electronics to Calibrate Cavities,” THPEA003, these proceedings.

THPEA006

!CHAOS Historical Engine

3158

M. Mara, A. Paoletti
Istituto Nazionale di Fisica Nucleare, Amministrazione Centrale, Frascati, Italy
C. Bisegni, G. Di Pirro, L.G. Foggetta, G. Mazzitelli, A. Stecchi
INFN/LNF, Frascati (Roma), Italy
L. Catani, F. Zani
INFN-Roma II, Roma, Italy

!CHAOS is an INFN project aimed at creating the communication framework and the services needed for the definition of a new control system standard, mainly addressed to large experimental apparatus and particle accelerators. !CHAOS is under test at DAΦNE accelerator and has been developed to overcome the strong requirements throughput of new accelerators, like superB. One of the main components of the framework is the historical engine (HST Engine), a cloud-like environment optimized for the fast storage of large amount of data produced by the control system’s devices and services (I/O channels, alerts, commands, events, etc.), each with its own storage and aging rule. The HST subsystem is designed to be highly customizable, such to adapt to any desirable data storage technologies, database architecture, indexing strategy and fully scalable in each part. The architecture of HST Engine and the results of preliminary tests for the evaluation of performance are presented.

THPEA010

Design and Implementation of the Remote Control System of the Digital Magnet Power Supply of China Spallation Neutron Source

3167

X. Wu, Y.C. He, J. Liu, C.H. Wang, J.C. Wang
IHEP, Beijing, People's Republic of China

The magnet power supplies of the China Spallation Neutron Source (CSNS) can be classified into three types: rapid cycling synchrotron (RCS) resonant power supplies, fast response power supplies and DC power supplies. All of the magnet power supplies are controlled by the intelligent controller called Digital Power Supply Control Module (DPSCM), which can regulate the current and voltage circuit. The DPSCM is developed by the power supply group. It has two RS232 communication interfaces. All the command setting and reading power parameters are transmitted by Modbus protocol. Therefore, we made the communication protocol based on Modbus RTU between the remote control system and the DPSCM. This paper introduces the design of the remote control interface to the DPSCM. We developed EPICS IOC applications and real-time database on MOXA embedded serial device DA710 and OPIs using Control System Studio (CSS) according to different kinds of the power supplies. We have tested the remote control system with these kinds of power supplies. The test result shows that the remote control system is stable and reliable and it can basically meet the requirements of power supply system and physicists.

THPEA011

WPF Based EPICS Server and its Application in CSNS

3170

Y.L. Zhang, G. Lei
IHEP, Beijing, People's Republic of China

The control system of China Spallation Neutron Source(CSNS) is under construction based on EPICS. The Linac low level RF(LLRF) local control program running on a local control PC uses Windows Presentation Foundation( WPF) as its development tool and uses the C# codes to implement the functionality. The Linac LLRF control system is non-EPICS, so the Linac LLRF local variables can’t be accessed directly from EPICS. Therefore we need to port the Linac LLRF local control system to EPICS. This paper presents the WPF base EPICS server and its application in CSNS.

THPEA017

Based on Channel Archiver of EPICS to Realize SSC-LINAC System Efficiently Beam Tuning

3179

S.Z. Gou, M. Yue, W. Zhang
IMP, Lanzhou, People's Republic of China

In order to improve running efficiency of accelerator, shorten the time of changing accelerator beam is key link and it should be considered how to accelerate the ion to specific energy quickly and accurately. We will discuss how to use years of heavy ion accelerator operation data to generate a set of virtual accelerator equipment data for specific ion and energy, load to all the accelerator equipment fast. EPICS provide Channel Archiver tools that can achieve and store data from the IOC equipment operation information. In this study, we use Archive Engine tool and Oracle to combine data acquisition function and data management function. Firstly store the Archive Engine acquisition data into Oracle database, and then according to the data to create accelerator system operation snapshot as the basis for beam tuning. The snapshot data includes all equipment state and parameters at special time in accelerator operating. When the ion is to be changed, related snapshot in Oracle database will be retrieved and loaded to all the equipment and to realize efficiently beam tuning.

THPEA018

Design of an Integrated Platform based on CSS and MATLAB for SSC-LINAC System Controlling and Data Analysis

3182

M. Yue, S.Z. Gou, W. Zhang
IMP, Lanzhou, People's Republic of China

CSS is the abbreviation of Control System Studio and is widely used in particle accelerator experiments area. Based on Eclipse, it is a collection of tools which can display details of the PV, show alarm state, as well as the function of data browsers, archive engine and so on. CSS offers an integrated approach to build a control system. We have recently developed a control and monitor system for the SSC-LINAC system to control and monitor power supply, vacuum, high frequency, and other accelerator equipments. In the area of accelerator controlling, we often need to do some mathematical operations like Fourier transform of the monitored data to get some accuracy performances of interested equipments. Unfortunately, CSS cannot satisfy this requirement. It is well known that MATLAB plays very well in data process and provides many mathematical tools. If we can combine these two tools together, we can get better control strategy. In the presentation, we will discuss the design of this integrated platform to implement the display, control and data process.

THPEA019

A Method of Implementing HIRFL-CSR Chopper Controls

3185

K. Gu, S. An, X.J. Liu, W. Zhang
IMP, Lanzhou, People's Republic of China

A method of implementing controls of chopper for HIRFL-CSR (Heavy Ion Research Facility of Lanzhou and Cooler Storage Rings) is introduced. This method is based on an ARM and DSP co-operation system. The control algorithm of this method is based on a data structure which is defined and implemented in the DSP module. Output data is created by the control algorithm and the actually pulse output is triggered by a timer which is achieved through a logic circuit actualized in a FPGA chip. The results show that the method is flexible and the control system matches the chopper regulating requirements.

THPEA020

The Design for Presetting Data Automatically in HIRFL Power Supply Control System

3187

X.J. Liu, Y. Chen, K. Gu, A. Shi, J.Q. Wu, F. Yang, W. Zhang
IMP, Lanzhou, People's Republic of China

This article introduces the structure of power supply in HIRFL(Heavy Ion Research Facility in Lanzhou) and designs a program which can preset power supply data automatically. We use Labview which is produced by NI Corporation to read Excel, access the Oracle database and send the generated instructions to power supply controllers. This program brings great convenience to physicists. It is used in SSC(Separated Sector Cyclotron) power supply system. The result shows that we can preset data quickly and accurately.

THPEA021

A Platform Control System for 320 kV HV Platform

3189

W. Zhang, K. Gu, J.Y. Li, X.J. Liu
IMP, Lanzhou, People's Republic of China

This article describes the platform control system applied to the Chinese Academy of 320KV HV platform for highly charged ions. This system is composed of the hardware and the software. The hardware is composed of the network controller based on ATmega128 core chip. Our control group has designed the network controller for controlling the different types of equipment on the platform. The control system achieves the reliability, stability control of the different types of equipment on the HV platform, and control of the network, improve operational efficiency. The software uses NI Corporation's LABVIEW to program user interface. We have established for the application modules of the network controller in the LABVIEW and realized the optimization of the network controller to configure and use. The platform control system has run three years in the 320KV HV platform.

THPEA022

The Remote Control System for LAPECR1

3192

W.X. Zhou, F.Y. Lin, J.F. Luo, Y.Y. Wang, J. Yin, Y.J. Yu, D.T. Zhou
IMP, Lanzhou, People's Republic of China

In order to support the debug of LAPECR1(Lanzhou All Permanent Magnet ECR Ion Source No.1) which merely provides H⁺ beam for HIRFL(Heavy Ion Research Facility in Lanzhou), a control system was realized in November 2011. The control system is composed of some controllers, a control-software and Intranet which is established by a switch. All of the controllers can access to Intranet directly or through serial-switch. And the controllers of the HV power and motor were designed by us. A IPC(Industrial Personal Computer) could control all of the equipments through Intranet. For the software of the system, it is designed using C++. And it could show the important data in the form of spectrum for the purpose of analysis and debug. The control system can acquire data and send command from/to the corresponding equipment.

THPEA024

The Control System of the SDUV-FEL Test Facility

3195

J.G. Ding, S.M. Hu, G.Y. Jiang, H.F. Miao, H. Zhao, H.J. Zhu
SINAP, Shanghai, People's Republic of China

At SINAP, the Shanghai deep ultraviolet FEL test facility (SDUV FEL) was integrated to test the FEL key technologies and principles. The facility was constructed based on the existed SINAP 100MeV LINAC with modifications of cathode gun replacement and magnet compressor segment increment, extension of the undulator section, and the seeded laser system. The control system of the facility has been developed which upgraded and extended from the existed LINAC control system. The system was integrated based on the EPICS toolkit, consists of several subsystems of magnet power supply control, timing, vacuum monitor, RF control, undulator gap adjustment, and machine protection system. In this paper, the SDUV FEL control system is introduced. Solutions of equipment control, hardware and software implementations, and system integrations are described in details.

THPEA028

Embedded EPICS Controller in Inserting Devices of SSRF

3204

G.Y. Jiang
SSRF, Shanghai, People's Republic of China
G.H. Chen
SINAP, Shanghai, People's Republic of China

SSRF is the first homemade third-generation of synchrotron radiation light source in China. In the first stage of SSRF, 7 beamlines have been built. Among of them, 5 beamlines have used inserting devices (IDs) including both of wigglers and undulators. To support stable and long life beam, the control part of these IDs must focus on high stability and high precision. Thus, Simens PLC, which has been widely used in industrial control fields, was used as local device controllers to control the motors. About upper layer control, we adopted a kind of embedded EPICS controller to implement the control of correction coil power supplies and PLC. This embedded EPICS controller is based on a commercial Ethernet/Serial converter which running MontaVista linux as its operation system. Beyond this, EPICS IOC Core program and several kinds of device control drivers were integrated to it. After several months using, the whole system works stably. Details of the necessary integration work and operation performance will be discussed in this paper.

THPEA030

Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators

3207

I. Rutkowski, K. Czuba, M. Grzegrzólka
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
D.R. Makowski, A. Mielczarek, P. Perek
TUL-DMCS, Łódź, Poland
H. Schlarb
DESY, Hamburg, Germany

Modern linear accelerators require high-precision RF field regulation of accelerating cavities. A critical component to achieve high-precision in the feedback loop a Low Level Radio Frequency (LLRF) controller is the vector modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design and performance of an improved vector modulator module (DRTM-VM2). It is constructed as Rear Transition Module (RTM). The module consists of digital, analog, diagnostic and management subsystems. FPGA from Xilinx Spartan 6 family receives data from control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier and fast RF gates for external interlock system. Pin assignment on the Zone3 connector is compliant with digital class D1.2 recommendations proposed by DESY. The design has been optimized for mass production and for easy extends to wider frequency range. Electronic switches offer software configuration of power and clock sources.

THPEA031

REGAE LLRF Control System Overview

3210

I. Rutkowski, Ł. Butkowski
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
M. Hoffmann, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany

The linear accelerator REGAE (Relativistic Electron Gun for Atomic Exploration) at DESY delivers electron bunches with a few femtosecond duration for time-resolved investigation of material structures in pump-probe configuration. To achieve sub-10fs resolution, the Low Level RF controls for the normal conducting S-band cavities must provide field stability of .005% in amplitude and of .005deg in phase. To achieve these demands, the recently developed LLRF control modules based on the Micro-Telecommunications Computing Architecture (MTCA.4) platform are used. For precise field detection and control a rear transition module (DRTM-DWC8VM1) housing 8 down-converters and 1 vector-modulator has been developed. The down-converted signals are transmitted to low-noise ADCs on an advanced mezzanine card (SIS8300L) with two high speed DACs driving the vector-modulator. The on board FPGA device runs the advanced control algorithms with minimum latency. Shot-to-shot learning feed forward and ultra-fast analog and digital feedbacks are applied. In this paper, the first results of the new RTM-AMC module pairs are presented together with the achievements and limitations on the RF field stability.

THPEA032

Software for Power Supplies Control of the NSLS-II Booster Synchrotron

3213

P.B. Cheblakov, A.A. Derbenev, S.E. Karnaev, S.S. Serednyakov
BINP SB RAS, Novosibirsk, Russia
M.A. Davidsaver, Y. Tian
BNL, Upton, New York, USA

The booster synchrotron of the NSLS-II light source at Brookhaven National Laboratory (BNL) provides electron beam acceleration from 200 MeV up to 3 GeV in 300 ms. This imposes strict conditions on both accuracy of control and synchronization of ramping Power Supplies (PS). Hardware part of PS controls are based on electronics specially developed at BNL and includes Power Supply Controllers (PSC) and Power Supply Interfaces (PSI). The former represents digital part of hardware and implements low-level logic (generating ramp functions, simple data verification and data acquisition), communication with control system software and PSI. The latter is an analogue part of entire system and it performs generation and acquisition analogue and digital signals by a set of on-board DACs, ADCs and digital inputs/outputs. The PSC and the PSI are connected by digital fibre optic link for electrical decoupling. This paper describes software for the booster synchrotron PSs control which is based on EPICS and includes a specially designed electronics configuration, a set of programs to manage ramp functions and to control different types of power supplies, both pulsed and ramping.

THPEA033

Electronics for Precise Measurements of Accelerator Pulsed Magnets

3216

A.V. Pavlenko, A.M. Batrakov, I.V. Ilyin
BINP SB RAS, Novosibirsk, Russia

Injection and extraction systems of modern accelerator complexes have high requirements for measurements accuracy of pulsed magnets field parameters. To satisfy these demands the fast and precision digital integrators were elaborated in BINP, Russia. These devices are intended for measurements in pulsed magnets (septum magnets, bumps, etc.) with the field duration, ranging from 5 μs, providing a relative accuracy better than 5•10^-5. The set of these devices are the main measuring electronics in injection and extraction section of 3 GeV Booster Ring at NSLS-II facility, which is under construction now in BNL (USA).

THPEA034

ESS Integrated Control System Integration Support and the Agile Methodology Proposal

3219

M. Reščič
Cosylab, Ljubljana, Slovenia
L. Fernandez, A. Nordt
ESS, Lund, Sweden

The stakeholders of the ESS Integrated Control System (ICS) reside in four main parts of the ESS machine: accelerator, target, neutron instruments and conventional facilities. In order to maintain and support the standardized hardware and software platforms for controls all of the stakeholders' integration requirements and efforts must be strictly harmonized. This called for a decision by the ICS to perform the majority of the work in a package titled 'Integration Support', ranging from FPGA code development to EPICS integration. This exposes a high number of interfacing systems and devices and planning of such activities for each system make the standard waterfall planning model highly inefficient and risky. In order to properly address the planning risks the agile methodology is proposed - from product owners and teams to scrums and sprints, everything to offer a better and more efficient integration support to controls stakeholders.

THPEA038

ESS Naming Convention

3222

K. Rathsman, G. Trahern
ESS, Lund, Sweden
J. Malovrh Rebec, M. Reščič, M. Vitorovic
Cosylab, Ljubljana, Slovenia

The European Spallation Source is an intergovernmental project building a multidisciplinary research laboratory based upon thermal neutrons. The main facility will be built in Lund, Sweden. Construction is expected to start 2013 and the first neutrons will be produced in 2019. The ESS linac will deliver 5 MW of power to the target at 2.5 GeV, with a nominal current of 50 mA. The ESS Naming Convention is based on a standard, originally developed for the Super Superconducting Collider (SSC) and later adopted by other large research facilities, e.g. the Spallation Neutron Source (SNS), Facility for Rare Isotope Beams (FRIB), International Thermonuclear Experimental Reactor (ITER), and the Continuous Electron Beam Accelerator Facility (CEBAF). The ESS Naming Convention was agreed upon and approved at a very early stage of the ESS project in order to establish a standard before names started to evolve. The main scope was to standardise meaningful, yet short and mnemonic signal and device names. The present paper describes the naming convention, the site wide implementation at ESS and associated web based tools.

THPEA050

Power Supply Control and Applications Development for the TPS Storage Ring Quadrupole and Sextupole Magnet

3258

Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The TPS intermediate power supply for storage ring quadrupole and sextupole magnets with current rating 250 Amp will be equipped with Ethernet interface. The quadrupole power supply is 18bit with higher stability than sextupole with 16 bits, and have internal data buffer for post-mortem capability. The dedicated IOCs are built individually at the 24 cPCI platforms to manipulate the devices of the 24 cells of storage ring respectively. Each IOC is used to control 10 quadrupole magnet power supplies and 7 sextupole magnet power supplies. The GUIs of storage ring quadrupole and sextupole power supplies controls were implemented by the EDM toolkit. The client console can use the specific EDM pages to access power supplies via PVs channel access. The measured currents of quadrupole and sextupole power supplies were read back for observing performance. Some applications, like the degauss process, boot function and etc, are also developed with the specific toolkit. The efforts will be summarized at this report.

THPEA055

NESTOR Facility Control System

3267

D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA057

Compensation Schemes for Operation of FEL Wigglers on Duke Storage Ring

3270

J.Y. Li, H. Hao, S.F. Mikhailov, V. Popov, W. Wu, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
The Duke FEL is the photon driver for the High Intensity Gamma-ray Source (HIGS). To extend the capabilities of the FEL and HIGS to higher photon energy regions, a FEL wiggler switchyard system was developed in the recent years. This system was installed and commissioned in 2012. The FEL wiggler switchyard is used to change between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section in a short period of time (a few days). With a total of six electromagnetic wigglers, the Duke FEL can be operated in a number of wiggler configurations and with a wide range of magnetic fields. The operation of uncompensated FEL wigglers can cause significant changes to the electron beam closed orbit and magnetic lattice. To maintain a sufficiently large dynamic aperture for an efficient injection and good beam lifetime, a set of complex compensation schemes, including magnetic field and lattice compensation, have been developed for the operation of the FEL wigglers. This paper reports the overall architecture and performance of the FEL wiggler compensation schemes and their implementation in the accelerator controls system using the feedforward mechanism.

THPEA059

Database for Accelerator Modeling

3273

C.P. Chu, J. Wu
SLAC, Menlo Park, California, USA
D. Dohan, G. Shen
BNL, Upton, Long Island, New York, USA
H.H. Lv
IHEP, Beijing, People's Republic of China
Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
A database for model data is design for the Facility for Rare Isotope Beams (FRIB) Project. The database schema design takes most general approach and is not limited to FRIB models. Programmatically access to the database can be done through a set of Application Programming Interfaces (APIs). Initial data population demonstrates that the database is suitable for XAL application framework. The model database is also part of a collaboration for complete database needs among various domains across an accelerator.

THPEA060

LLRF System for LCLS-II at SLAC

3276

Z. Geng, B. Hong, K.H. Kim, R.S. Larsen, D. Van Winkle, C. Xu
SLAC, Menlo Park, California, USA

Funding: Work supported by US Department of Energy Contract DE AC03 76SF00515
After LCLS-I successfully delivering the full operation for users, SLAC has been approved to build the second Linac Coherent Light Source, LCLS-II, which makes use of another third of the 2-mile long Linac from Sector 10 to Sector20. The LLRF System will use mTCA (Micro Telecommunication Computing Architecture) to replace the VME system for LCLS-II injector and some key stations along the LINAC. The faster data acquisition and more powerful FPGA and CPU in the mTCA system enable the LLRF system to extend its control ability to a 2.5 μsec beam pulse rate of 360Hz. The new LLRF system is more compact and has the capability of low latency intra-pulse feedback to reduce fast phase and amplitude jitter during a single pulse. The prototype of the mTCA based LLRF control system has been operating at RF station 28-2 in LCLS-I. Detailed design structure and the prototype experimental results will be presented that demonstrate the system meets the exacting phase and amplitude stability requirements for LCLS-II.

THPEA061

EPICS Accelerator Control System for the IAC-RadiaBeam THz Project

3279

A. Andrews, B.L. Berls, T. Downer, C.F. Eckman, K. Folkman, Y. Kim, C. O'Neill, J. Ralph
IAC, Pocatello, IDAHO, USA
P. Buaphad, Y. Kim
ISU, Pocatello, Idaho, USA

The Idaho Accelerator Center (IAC) of Idaho State University has been operating a 44 MeV L-band linac for various nuclear physics related applications. However, for the past several years, this research has been done without the aid of a modern computer based control system. To obtain a better reproducibility and stability in operation, the EPICS accelerator control system has been applied to control various components of this linac. This has been done for the purpose of a joint THz research project between IAC and RadiaBeam that was performed in November 2012. This paper describes the development of the EPICS accelerator control system used during this joint THz research experiment.