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| MOPC095 | Mechanical and Thermal Prototype Testing for a Rotatable Collimator for the LHC Phase II Collimation Upgrade | simulation, collimation, beam-losses, impedance | 286 | ||
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The Phase II upgrade to the LHC collimation systems calls for complementing the 30 high robust Phase I graphite collimators with 30 high Z, low impedance Phase II collimators. The design for the collimation upgrade has not been finalized. One option is to use metallic rotatable collimators and this design will be discussed here. The Phase II collimators must be robust in various operating conditions and accident scenarios. A series of prototype collimator jaws have been tested for both mechanical and thermal compliance with the design goals. Collimator jaw shape after thermal expansion benchtop tests were compared to ANSYS simulation results. Mechanical tests were also performed to demonstrate fabrication precision and collimator movement operation as designed.
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| MOPC101 | Design Considerations of Fast-cycling Synchrotrons Based on Superconducting Transmission Line Magnets | proton, synchrotron, cryogenics, target | 301 | ||
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Fast cycling synchrotrons have become necessary components of contemporary accelerator systems for advanced nuclear and high-energy physics programs. We explore a possibility of using super-ferric dipole magnets of up to 2 Tesla B-field powered by a superconducting transmission line conductor. We present both the LTS and the HTS conductor design options for these magnets and their impact on both static and dynamic power losses with operation cycles from o.5 Hz to 5 Hz, depending on the beam energy and the size of the accelerator ring. We also discuss expected B-field quality and the corrector magnets options. We outline magnet string inter-connections and creation of space for the corrector magnets and discuss option for a superconducting dump switch of the quench protection system.
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| MOPC105 | Activities of Hitachi Relating to Construction of J-PARC Accelerator | synchrotron, linac, injection, rfq | 310 | ||
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The Japan Proton Accelerator Research Complex (J-PARC) consists of a 330-m-long linac, a 3-GeV rapid cycle synchrotron with a circumference of 350 m, and a 50-GeV synchrotron with a circumference of 1,570 m. Owing to a collaboration between the Japan Atomic Energy Agency (JAEA) and the High Energy Accelerator Research Organization (KEK), the accelerators will be commencing operations at the site of JAEA Tokai Research and Development Center. The beam commissioning of the entire accelerator system is planned to take place before the end of 2008. Along with the JAEA and KEK, Hitachi has contributed to the construction of the system by manufacturing some major equipment with specifications that are of the highest level in the world.
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| MOPC121 | Progress on Dual Harmonic Acceleration on the ISIS Synchrotron | acceleration, synchrotron, proton, beam-losses | 349 | ||
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The ISIS synchrotron at the Rutherford Appleton Laboratory in the UK is currently undergoing an RF upgrade. Four, h=4 cavities have been installed in addition to the existing 6, h=2, cavities and should be capable of increasing the operating current from 200 to 300 μA. Two of the four cavities have been in operation for the last 2 user cycles improving trapping lossess and increasing operating currents beyond 200 μA. The remaining two cavities were commissioned in the spring of 2008. This paper reports on hardware commissioning, beam tests and beam simulation results.
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| MOPC144 | Installation of the Front End Test Stand High Performance H- Ion Source at RAL | ion, ion-source, extraction, acceleration | 412 | ||
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.
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| MOPD015 | Current Status of Development in TETD of High-power Vacuum Microwave Devices | klystron, linac, electron, proton | 475 | ||
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TETD (Toshiba Electron Tubes & Devices Co., LTD.) has been developing a wide variety of klystrons and input couplers in collaboration with some Japanese research institutes. This article presents recent results of the development including a C-band and an S-band pulsed klystrons for SPring-8 Joint Project for XFEL, 1.3-GHz horizontal MBK for DESY and a 1.3-GHz TTF-type input coupler for the European XFEL. As an application to fusion experimental devices, development of a 5-GHz, 500-kW CW klystron for KSTAR and a 170-GHz quasi CW gyrotron for ITER are also presented.
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| MOPD016 | ALS Storage Ring RF System Upgrade | klystron, storage-ring, controls, booster | 478 | ||
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ALS is one of the first third generation synchrotron light sources which has been operating since 1992 at Berkeley Lab. Presently, the ALS Storage Ring System is comprised of a single 330kW klystron feeding two normal-conducting single-cell RF cavities via a WR1800 circulator and magic-tee transmission system. The klystron has operated well beyond its expected lifetime and even though replacement klystrons are available from a different manufacturer, we have opted to build the replacement amplifier with a system of four Inductive Output Tubes, (IOT). The new amplifier system will use Cavity Combiners (CaCo) to combine IOT outputs and a magic-tee to combine IOT pairs to feed the existing transmission line connected to the cavities. The existing HVPS will be upgraded to interface with the four IOT amplifiers and its crowbar will be replaced with a series solid-state switch. The system is being designed to operate with the industry standard external cavity IOTs (80kW) and integral cavity IOTs (90-100kW). In this paper we will present the details of the upgrade of each of the sub-systems in the ALS Storage Ring RF System.
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| MOPD024 | RF Power System for the IFMIF-EVEDA Prototype Accelerator | rfq, controls, radio-frequency, linac | 496 | ||
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The IFMIF-EVEDA accelerator will be a 9 MeV, 125 mA cw deuteron accelerator prototype for verifying the validity of the accelerator design for IFMIF. The RFQ, matching section and DTL resonant cavities must be fed with continuous RF power at 175 MHz frequency with an accuracy of 1% in amplitude and ± 1° in phase. Currently two possible solutions for the DTL design are considered. The first option consists of normal conducting (NC) Alvarez type cavities and the second option consists of superconducting (SC) Half Wave Resonator cavities. Both options impose different demands on the RF system which are analyzed in this paper. The RF power system will be made of several amplification stages and will be based on vacuum tube amplifiers. The main characteristics of RF system including those of the high voltage power sources required to feed the anodes of the high power tubes will be presented in this paper.
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| MOPD027 | AMC-based Radiation Monitoring System | radiation, monitoring, controls, electron | 505 | ||
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This paper reports a novel radiation monitoring system able to monitor gamma and neutron radiation in an accelerator tunnel in the nearest proximity of the electronic components of the control system. The monitoring system is designed as an Advanced Mezzanine Module (AMC) and it is dedicated for the Low Level Radio Frequency (LLRF) control system based on the Advanced Telecommunication Computing Architecture (ATCA). The AMC module is able to communicate with LLRF control system using both I2C interface defined by Intelligent Platform Management Interface (IPMI) standard and PCI Express. The measured gamma radiation dose and neutron fluence are sent to data acquisition computer using Ethernet network and stored in a database. Static Random Access Memory (SRAM) is applied as a neutron dosimeter. The principle of the detector is based on the radiation effect initiating the Single Event Upsets (SEUs) in a high density microelectronic SRAMs. A well known RadFET dosimeter is used to monitor gamma radiation.
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| MOPD028 | Radio Frequency Power Sources for the Muon Ionisation Cooling Experiment | cathode, vacuum, controls, monitoring | 508 | ||
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For any future Neutrino Factory the accelerator aperture will be a major cost driver. Potentially the aperture can be reduced and significant capital savings made if ionisation cooling is utilised on the muon beam. In order to demonstrate the effectiveness of ionisation cooling a demonstrator needs to be built and operated. MICE, the Muon Ionisation Cooling Experiment is that demonstrator. The RF requirements of MICE will be met using high power vacuum tube based RF circuits donated by LBNL and CERN. This paper will discuss these circuits, their refurbishment, the construction of HT power supplies and ancillary equipment and high power testing.
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| MOPD033 | The ALBA RF Amplifier System Based on Inductive Output Tubes (IOT) | controls, factory, coupling, storage-ring | 523 | ||
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The ALBA accelerator RF systems include a complete new transmitter developed in collaboration between Thomson Broadcast & Multimedia (TBM), Thales Electron Devices (TED) and CELLS. A new IOT version, based on the previous TH793 has been developed by TED: the TH793-1, dedicated to scientific applications. It has demonstrated cw operation up to 90 kW at 500 MHz. In addition, a TH18973 LS cavity has also been developed, featuring a 6”1/8 coaxial RF output, an optimized cooling system and centred operation at 500 MHz, 7 MHz bandwidth and ± 5 MHz tuning range. TBM developed a new amplifier system to achieve high reliability and performance. Each IOT is powered by an individual power supply based on the Pulse Step Modulator technology. The amplifier control system was designed on a PLC controller with the possibility to interface with the Tango control system. The first amplifier was delivered to ALBA in summer 2007 and is already in use for the conditioning and testing of the first RF cavity. The remaining 13 amplifiers will be delivered in the second half of 2008. The paper gives an overview on the design and operation performance during commissioning and cavity testing.
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| MOPD034 | Status of the High Power, Solid-State RF Amplifier Development at Laboratori Nazionali di Legnaro | controls, synchrotron, extraction, coupling | 526 | ||
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The development of high power, unconditionally stable solid-state amplifiers for superconducting low-beta cavities, performed at Laboratori Nazionali di Legnaro in the framework of the EURISOL Design Study, has led to the construction and testing of two, newly designed 10 kW units that can be used both individually or coupled together to obtain a 20 kW source. Characteristic of this family of amplifiers, based on parallel assemblies of 300W modules equipped with mosfets and individual circulators, is their possibility of operating in any matching conditions and also, at a reduced power, in case of failure of one mosfet. Characteristics of the amplifiers and of the high power combiner will be described, and their performance and test results will be reported.
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| MOPP002 | A Study of Failure Modes in the CLIC Decelerator | quadrupole, lattice, simulation, linac | 550 | ||
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The CLIC Drive Beam decelerator is responsible for producing the RF power for the main linacs, using Power Extraction and Transfer Structures (PETS). To provide uniform power production, the beam must be transported with very small losses. In the paper failure modes for the operation of the decelerator are investigated, and the impact on beam stability, loss level and machine protection issues is presented. Quadrupole failure, PETS inhibition and PETS break down scenarios are being considered.
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| MOPP099 | MICE RF System | controls, emittance, factory, superconducting-magnet | 787 | ||
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The Muon Ionisation Cooling Experiment (MICE) at the Rutherford Appleton Laboratory uses normal conducting copper cavities to re-accelerate a muon beam after it has been retarded by liquid hydrogen absorbers. Each cavity operates at 200MHz and requires 1MW of RF power in a 1ms pulse at a repetition rate of 1Hz. In order to provide this power, a Thales TH116 triode, driven by a Burle 4616 tetrode is used, with each amplifier chain providing ~2.5MW. This power is then split between 2 cavities. The complete MICE RF system is described, including details of the low level RF, the power amplifiers and the coaxial power distribution system.
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| MOPP103 | High Field Gradient RF System for Bunch Rotation in PRISM-FFAG | impedance, controls, cathode, synchrotron | 796 | ||
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The PRISM project aims to supply a high quality muon beam using a wide aperture FFAG for mu-e conversion experiment. The low energy muon which has a large momentum spread will be manipulated in the FFAG using a bunch rotation technique with a low frequency RF around 3.5 MHz. Because of a short lifetime of muon, the rotation should be end in 5-6 turns in the FFAG and more than 2 MV is needed. The low frequency RF system using a magnetic alloy is designed to achieve a very high field gradient of more than 200 kV/m. The whole system is designed for a very low duty pulse operation to minimize the cost. The system has been modified to operate at 2 MHz for the beam test using alpha particle. A field gradient of more than 100 kV/m has been obtained by the preliminary test.
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| MOPP104 | Possible Upgrade Scenario for J-PARC Ring RF | impedance, synchrotron, acceleration, linac | 799 | ||
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The whole J-PARC RCS RF system is operational and during beam commissioning in 2007 the beam in RCS was successfully accelerated to final energy and then extracted. The Main Ring RF system has been installed in the tunnel. Both Ring RF systems are based on the new technology using magnetic alloy loaded cavities and have achieved higher field gradient than existing ferrite base RF systems in this frequency region. For the future upgrade of the J-PARC Main Ring, a short accelerating cycle is required to increase the average beam current. In this paper, a possible upgrade scenario for RF cavities based on improvements of the magnetic alloy ring cores will be described.
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| MOPP121 | Full Real-time Temperature Mapping System for 9-cell ILC-type Cavities | monitoring, radio-frequency | 841 | ||
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The mapping of outer-wall temperatures during the vertical test of a superconducting radio-frequency (SRF) cavity has been one of the most successful tools in detecting the cavities’ critical hot spots. However, due to the excessive number of sensors needed, no fixed-type temperature mapping (T-mapping) system that covers all cells has been built for 9-cell cavities. With the consensus that T-mapping analysis is needed in order to improve the yield of high-gradient cavities, a system with a reduced data acquisition time and increased temperature sensitivity, compared to rotating-arm systems, has been developed at Los Alamos National Laboratory. The system consists of ~5,000 100 Ω 1/8W Allen-Bradley resistors placed azimuthally every 10 degrees, a similar number of other resistors and diodes that implement the switching scheme, and data acquisition codes written in Labview. The details of the system and first results are presented and discussed.
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| TUPC006 | A CompactRIO-based Beam Loss Monitor for the SNS RF Test Cave | beam-losses, radiation, controls, diagnostics | 1050 | ||
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An RF Test Cave has been built at the Spallation Neutron Source (SNS) to be able to test RF cavities without interfering the SNS accelerator operations. In addition to using thick concrete wall to minimize radiation exposure, a Beam Loss Monitor (BLM) must abort the operation within 100 μsec when the integrated radiation within the cave exceeds a threshold. We choose the CompactRIO platform to implement the BLM based on its performance, cost-effectiveness, and rapid development. Each in/output module is connected through an FPGA to provide point-by-point processing. Every 10 μsec the data is acquired analyzed and compared to the threshold. Data from the FPGA is transferred using DMA to the real-time controller, which communicates to a gateway PC to talk to the SNS control system. The system includes diagnostics to test the hardware and integrates the losses in real-time. In this paper we describe our design, implementation, and results.
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| TUPC019 | A Retarding Field Detector to Measure the Actual Energy of Electrons Participating in E-cloud Formation in Accelerators | electron, controls, simulation, pick-up | 1086 | ||
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Electron cloud related phenomena can cause potentially detrimental effects on beam stability in many planned and under construction accelerators. The possibility to reduce such unwanted phenomena lies on the observation that, machine commissioning does reduce Secondary Electron Yield (SEY). Such SEY reduction (scrubbing) is due to the fact that electrons produced during e-cloud formation hit the accelerator wall, modifying their surface properties. ‘Scrubbing” has been studied only as a function of impinging electron dose but never as a function of the e-cloud electron energy. Simulations predict that the e-cloud is formed by electrons with very low energies (<50 eV). Given the potentially lower scrubbing efficiency for equal dose of very low energy electrons compared to medium energy one, it would be important to measure the actual energy of the electrons forming the cloud in real accelerators. For this reason we decided to construct an optimized retarding Field energy electrometer to be installed in accelerators. Here we will describe what solutions have been adopted during the design phase of such “home made” detector and some laboratory test will be showed and discussed.
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| TUPD004 | 10Hz Pulsed Power Converters for the ISIS Second Target Station(TS-2) | kicker, pulsed-power, controls, proton | 1440 | ||
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The Extracted Proton Beamline to the ISIS second target station has two 10Hz pulsed magnet systems which extract the proton beam from the existing 50Hz beamline. Kicker 1 magnet system deflects the beam 12.1mrad and kicker 2 magnet system deflects the beam 95mrad. Both magnets are identical, however each pulsed power converter is considerably different. This paper describes the design requirements, topology, installation, testing and successful operation of both pulsed power converters.
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| TUPD007 | The Design and Fabrication of the Kicker Power Supply for TPS Project | kicker, injection, storage-ring, photon | 1446 | ||
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The preliminary test results of the kicker power supply for TPS (Taiwan Photon Source) project will be presented in this report. The achieved capability of this test unit demonstrates that it fulfills the design requirement of providing half-sine pulsed current of 2.5 kA (peak), 5.2 s (base-width), with jitter < 1 ns (peak-to-peak). Both units of using thyratron and IGBT switches are built with the same requirements. The technical considerations of both units for this particular application will be discussed.
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| TUPD010 | High-power Switch with SI-thyristor for the Power Supply of Very High Repletion Rate Pulsed Quadrupole Magnet | quadrupole, induction, kicker, positron | 1452 | ||
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A solid-state switch with SI-thyristors is implemented as the high power switch for the pulsed quadrupole magnet power supply. Its repletion rate is 100 kHz with the half sign 1 microsecond pulse. The switch has been successfully operated.
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| TUPD016 | Grounding and Induced Voltage Issues of the Injection Bump Magnet System of the 3-GeV RCS in J-PARC | controls, linac, proton, synchrotron | 1461 | ||
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The power supply of the injection shift bump magnets is required to rate a large current with high precision. The rating current is 20 kA and the pulse width is 1.3 ms. The power supply with the multiple connected two-quadrant IGBT choppers, which is controlled by the switching frequency over 48 kHz, realizes the tracking error less than 1.0 %. However, the switching noise due to the IGBT choppers caused damages to the control device and the measuring instrument. The ground cables were changed to copper sheets, so that the voltage due to the switching noise between the power supply board and the ground decreased from 800 V to 40 V. Furthermore, the output voltage of the RF shield was measured in connection with the several waveform patterns. These results showed the good agreement with the calculation and the experiment. The good performances of the shift bump magnet and power supply have been confirmed.
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| TUPD017 | Design of Main Ring Dipole Power Supply for HIRFL-CSR | controls, dipole, feedback, heavy-ion | 1464 | ||
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This paper introduces the main circuit topologic, control method and double reference setting system of a dipole power supply which is the pivotal device of the HIRFL-CSR(Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring). The power supply works at the pulse mode, with the peak output power of 3.15MW (3000A, 1045V). To fulfill difficult requirements especially for the tracking error, which is needed less than 300ppm, a special topologic is adopted. The power supply has two parts: SCR rectifier provides the most energy and PWM converter provides correcting current and perfect reaction for tracking current setting. Now the dipole power supply is performing well during the CSR commissioning, with the perfect tracking error, well long-time stability and low ripple current.
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| TUPP002 | Uniform Motion Control Solution for Variety of Motion Applications | controls, feedback, acceleration, insertion | 1526 | ||
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Control solutions for motion applications require high degree of flexibility regarding the use and connectivity. Being fairly simple or highly complex, micro- or millimeter precision, one or multiple axis… the system designer has to tackle specific interfacing issues. One platform should fit different applications and provide cost effective solutions. Flexible software platform is required on one side to satisfy control system (CS) application requirements. On the other side variety of hardware (HW)–controlled by motion controller, i.e., power stages, position feedback–also requires some degree of connection flexibility. Paper presents a design of a motion control platform that offers flexible interfacing both to CS and HW, elegant extendibility options for selection of feedback protocols, low-level direct access for engineering control and enables large distances between controller and motors.
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| TUPP004 | Evolution and Status of the Electronic Logbooks at the ESRF | controls, storage-ring, synchrotron, radio-frequency | 1532 | ||
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In 2004 the ESRF moved to electronic logbooks. Such logbooks should be configurable enough to be used in several situations: document management, exchange of technical information and, in the Control Room, as a powerful tool for storing and retrieving information at a glance. The St James software company developed such a product which met our constraints and which is easy to configure. Moreover, this product can be tailored and evolved with time by its users and allows automatic access to control system parameters. After gaining experience with several logbooks using the old version 4 system, a new more user-friendly version which offers extensive customisation possibilities has been launched. This new version, J5, has already been interfaced to the ESRF control system (Tango) through a Python binding. This allows automatic triggering of records on specific events and the generation of automatic reports from the history database system. J5 can use an LDAP server for security management.
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| TUPP005 | Application Programs for the Elettra Booster Commissioning and Operation | booster, optics, controls, lattice | 1535 | ||
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The application programs developed for the commissioning and operation of the new Elettra injector* are all based on the TANGO control system, a new high level framework and a beam optics module named Vicky**. The present paper summarizes the main developed application programs and their successful use during commissioning and operation of the new injector.
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*"Overview of the Status of the Elettra Booster Project," these proceedings. |
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| TUPP009 | Implementation and Operation of the Elettra Booster Control System | controls, booster, injection, linac | 1544 | ||
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A new injector based on a 100 MeV linac and a 2.5 GeV booster synchrotron has been built and commissioned at Elettra to provide full energy and top up injection into the storage ring. The booster replaces the 1.2 GeV linac that will be used for the new 4th generation light source FERMI@Elettra currently under construction at Elettra. A new architecture has been adopted for the booster control system based on the Tango control system software. The implementation of the control system and the tools developed to meet an aggressive commissioning time schedule are presented. The experience gained during the operation of the booster is also discussed.
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| TUPP014 | Control System for a 150 MeV FFAG Complex in KURRI | controls, radiation, proton, booster | 1556 | ||
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A simple, convenient control system has been developed for a 150 MeV proton FFAG accelerator complex at Research Reactor Institute, Kyoto University(KURRI). This control system is based on conventional PCs and programmable logic controllers (PLC) and these are connected over TCP/IP network. Each PLC is responsible for autonomous control of connected devices such as motors or power supplies, and also responsible for maintaining a parameter database periodic(~100 ms typically) read/written by remote PCs over TCP/IP network. Man-machine interfaces and integrated sequences are developed using LabView environment on these PCs. This control system has been successfully served for the actual operation of the FFAG complex, including the radiation protection control. Further developments, such as portable devices serving man-machine interfaces on site and the integration of SQL server for logging all possible parameters of this accelerator complex, are on the way.
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| TUPP157 | Commissioning of L-band Electron Accelerator for Industrial Applications | electron, klystron, bunching, gun | 1875 | ||
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An intense L-band electron linear accelerator is under construction at CESC (Cheorwon Electron-beam Service Center) for industrial applications. It is capable of producing 10-MeV electron beams with a 30-kW average beam power. For high-power capability, we adopted 1.3 GHz, and the RF source is a 25-MW pulsed klystron with a 60-kW average RF output power. A pre-buncher is used before the bunching section, which is built-in with the regular accelerating sections. The accelerating structure is a disk-loaded waveguide with a constant-impedance operated in the 2π/3-mode. It is to be operated under the fully beam-loaded condition for high average power with the 6-μs pulse length and the 350-Hz repetition rate. In this paper, we present details of the accelerator system and commissioning results.
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| WEPC055 | General Status of SESAME | microtron, controls, storage-ring, booster | 2115 | ||
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An update of the status of SESAME is presented. SESAME is a third generation light source facility under construction in Allan, Jordan. The storage ring electron beam energy is 2.5 GeV, the beam emittance is 26 nm.rad and 12 straight sections are available for Insertion Devices. The injector consists of a 22.5 MeV microtron and 800 MeV booster synchrotron, with a repetition rate of 1 Hz. The SESAME building has been handed over on Dec. 2007 and this note focuses on the upgrade and installation plans for the SESAME injector system during the 2008. In the meantime, preparations of technical specifications for most of the storage ring subsystems are in progress. In this note the conceptual design of the storage ring’s bending magnet, pulsed magnets and their power supplies, RF system, shielding wall and the cooling system are presented. The tendering of these components is expected by mid 2008.
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| WEPC083 | Status of the SSRF Booster | booster, injection, dipole, extraction | 2189 | ||
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The SSRF booster is a 2Hz electron synchrotron. It accelerates electrons, coming from a 150 MeV linac, to a final energy of 3.5 GeV in 250ms and extracts them into the storage ring. The booster lattice is based on a FODO structure with missing dipoles, forming 28 cells with 8 straight sections of a 2-folder symmetry and 180m circumference. The SSRF injector (Include 150 MeV linac, booster and two transport lines) was designed for Top-Up injection, which has single-bunch and multi-bunch beam modes. After 9 months installation and pre-commissioning, the SSRF booster commissioning started on September 30, 2007. The first 3.5GeV beam was obtained On Oct.5, and the first extracted beam was obtained on Oct.29, 2007. The booster serves as a injector for storage ring from Dec. 21, 2007. In this paper, the design, installation and commissioning of the SSRF booster and transport lines are described.
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| WEPC091 | Beam Injection by Use of a Pulsed Sextupole Magnet at the Photon Factory Storage Ring | injection, sextupole, storage-ring, pulsed-power | 2204 | ||
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We will install a pulsed sextupole magnet (PSM) in order to test a new injection system for the top-up injection at the Photon Factory storage ring (PF ring) in the spring of 2008. A parabolic magnetic field of the PSM can give an effective kick to the injected beam that passes a distant region from the field center. And there is little modulation of the orbit of the stored beam because it passes around the center of the PSM. To achieve the beam injection at the PF ring, the PSM has a length of 0.3m, a magnetic field of 400 Gauss at a peak current of 3000A and a pulse width of 2.4μsec in a half-sine form. We already made the PSM and measured the magnetic field. We will report the result of the PSM beam injection at the PF ring.
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| WEPC093 | Finalized Design of the Pulsed Magnets and their PS for SESAME Ring Injection | kicker, septum, injection, vacuum | 2210 | ||
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The design of the SESAME storage ring injection pulsed magnet systems have been improved in order to take benefit of the most recent realizations in Synchrotrons. These pulsed systems are optimised for the injection into the 2.5GeV storage ring of the 800 MeV electrons beam prepared by the Booster. The septum magnet is based on a direct driven septum technology, out of vacuum, with a thin vacuum chamber of rectangular cross section permitting to get a good field transverse homogeneity. The four kicker magnets will be of the window frame geometry, around a racetrack alumina vacuum chamber, integrating a forced air cooling in order to avoid significant thermal heating due to the stored beam. These magnets can be opened for backup and will be completely CEM shielded. Their pulsed power supplies will be built based on solid-state HV switches, even for short half-sine pulses generation.
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| WEPC102 | Commissioning of the Electromagnetic Insertion Devices at SOLEIL | undulator, radiation, insertion, insertion-device | 2237 | ||
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SOLEIL is the French 2.75 GeV third generation synchrotron radiation light source. Eleven undulators are installed yet in the storage ring and nineteen more Insertion Devices (ID) will be installed on the ring by January 2010. Among the installed IDs, there are four electromagnetic undulators of two different designs: one 640 mm period air coils undulator called HU640 and three 256 mm period undulators called HU256, made up of independent H yoke dipoles. The HU640 provides photons in any polarisation from linear to elliptical, in a range extending from 5 to 40 eV, thanks to three different groups of coils powered independently. The HU256, which are subject to hysteresis, provide horizontal and vertical, periodic or quasi-periodic linear polarisations, and also circular polarisation, covering a total range from 10 eV to 1 keV. The effects of each undulator on the closed orbit have been extensive studied, and compensated, using dedicated embedded steering coils. The correction method will be explained and its results will be shown and compared to the magnetic measurements. Finally, the first measurements of the radiation produced will be shown and compared to previsions.
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| WEPC110 | Development of a Conventional Multipole Wiggler MPW-80 | wiggler, multipole, synchrotron, electron | 2258 | ||
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The design for an 80 mm period hybrid wiggler is presented. The design requirements and mechanical difficulties for holding, positioning, and driving the magnetic arrays are explored. The structural and finite element analysis, magnetic design, and electrical considerations that influenced the design are then analyzed. This wiggler will be installed at ALBA a new synchrotron radiation source being built at the site of the Centre Direccional in Cerdanyola del Vallès, nearby Barcelona, and will produce ultra-violet and X-ray beams of exceptional brightness. The facility will comprise a 3 GeV electron storage ring, injected from a ~100 MeV linac through a full energy booster synchrotron.
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| WEPC137 | Design of Two Variable Polarization Undulators for the ALBA Project | undulator, controls, polarization, beam-losses | 2329 | ||
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This paper summarizes the main aspects of the magnetic, mechanical and control system design of two APPLE-II type undulators presently under construction in the framework of a collaboration between CELLS and Sincrotrone Trieste.
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| WEPC154 | Design and Fabrication of Multipole Corrector Magnet | controls, multipole, quadrupole, octupole | 2368 | ||
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The Taiwan Light Source (TLS) had started to operate in top-up mode injection since October 2005. Meanwhile, the Elliptically Polarized Undulator (EPU5.6) was operated very well in the decay mode operation. However, the partial beam loss had occurred when the top-up injection was executed at magnet gap and magnet array phase are fixed at the minimum gap and π(vertical polarization mode), respectively. In order to solve the partial beam loss, we design a new multipole corrector magnet to be installed in the downstream of the EPU5.6 to compensate for the multipole field error. This multipole magnet can provide the normal and skew components of the dipole, quadrupole, sextupole, octople, and dodecapole field components. Changeable multipole field components mechanism has been designed by using a special electric circuit. In addition, the measurement systems of Hall probe and stretch wire are used to measure the field quality of the multipole corrector magnet. This report will discuss the magnet circuit design, mechanical design, the switching mechanism of the multipole field components, and the field measurement results.
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| WEPD008 | Automatic System for the DC High Voltage Qualification of the Superconducting Electrical Circuits of the LHC Machine | controls, monitoring, cryogenics, dipole | 2416 | ||
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A system has been developed to verify automatically with the application of a DC high voltage, the insulation resistance between circuits to circuit and circuit to ground. In the most complex case of the LHC machine up to 72 circuits share the same volume inside the cryogenic lines and each circuit can have an insulation fault versus any other circuit or versus ground. The system can connect up to 80 circuits and apply a voltage up to 2 kV DC. The leakage of current flowing through each circuit is measured within a range of 1 nA to 2 mA. The matrix of measurements characterizes the paths taken by the currents and recognizes weak points of the insulation between circuits. The system is composed of a DC voltage source, a data acquisition card that measures with precision currents and voltages and drives up to 5 high voltage switching modules offering each 16 channels. A LabVIEW based application controls the system for an automatic and safe operation. This paper describes the hardware and software design, the testing methodology and the results obtained during the qualification of the LHC superconducting circuits.
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| WEPD010 | Electronic Systems for the Protection of Superconducting Devices in the LHC | dipole, extraction, insertion, quadrupole | 2422 | ||
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The Large Hadron Collider LHC incorporates an unprecedented amount of superconducting components: magnets, bus-bars, and current leads. Most of them require active protection in case of a transition from the superconducting to the resistive state, the so-called quench. The electronic systems ensuring the reliable quench detection and further protection of these devices have been developed and produced over the last years and are currently being put into operation. The paper will describe the various protection devices and hereby focus on the final test and commissioning phase of the system. First results from operation will be presented as well as an analysis of the system performance.
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| WEPD020 | Stability of Superconducting Wire in Magnetic Field | superconducting-magnet, cryogenics, dipole | 2449 | ||
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Main cause of premature quench in superconducting magnet is the heat generated due to superconducting wire motion. The wire motion occurs where electromagnetic force to conductors exceeds frictional force on surfaces of the conductors. Hence, frictional properties of the conductors and winding structures are important parameters for characterizing stability of the superconducting windings. An experimental setup was prepared to detect wire movement by observing spike in voltage of the superconducting sample wire. A detailed study was carried out in order to study superconducting wire motion under different experimental conditions such as varying applied load to specimen wire, back up field, varying the interface of superconductor and base material. The base materials used are polyimide film and Dyneema. The Dyneema has low frictional coefficient and negative thermal expansion. In the case of Dyneema, it is found that amplitude of voltage generated due to wire motion reduces and also relatively smooth motion of wire is observed. These effects are attributed to the low frictional coefficient. The experimental observation will be discussed in detail.
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| WEPP170 | A 15-T Pulsed Solenoid for a High-power Target Experiment | target, proton, factory, collider | 2889 | ||
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The MERIT experiment, which ran at CERN in 2007, is a proof-of-principle test for a target system that converts a 4-MW proton beam into a high-intensity muon beam for either a neutrino factory complex or a muon collider. The target system is based on a free mercury jet that intercepts an intense proton beam inside a 15-T solenoidal magnetic field. Here, we describe the design and performance of the 15-T, liquid-nitrogen-precooled, copper solenoid magnet.
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| THPC065 | Orbit Stability Status and Improvement at SOLEIL | feedback, booster, target, injection | 3134 | ||
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SOLEIL is a 2.75 GeV third generation synchrotron light source delivering photons to beam-lines since January 2007. Stability of the beam-line source points is crucial for the user experiments. Typically this stability has to be below one tenth of the transverse beam sizes. This is challenging especially in the vertical plane leading to sub-micrometer values. This paper will describe the position stability achieved today without and with the slow orbit feedback. Impact of different noise sources and present limitations will be described. To end an improvement strategy will be given for short and medium terms.
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| THPC119 | Progress of TLS Fast Orbit Feedback System and Orbit Stability Studies | feedback, controls, simulation, brilliance | 3260 | ||
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The orbit feedback system of the TLS has been deployed for a decade and continuously upgraded. However, due to limitation of the existing hardware, the system cannot remove orbit excursion caused by the perturbation due to fast operation of insertion devices. The newly proposed orbit feedback system with the upgraded digital BPM system and switching corrector power supply system is planned to be installed and commissioned in late 2008. The preliminary calculation on the stability performance for the orbit feedback system is presented in the report. New fast orbit feedback system can be expected to achieve a submicron stability of the electron beam working at a bandwidth of at least 60 Hz.
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| THPC120 | Conceptual Design and Performance Estimation of The TPS Fast Orbit Feedback System | feedback, controls, vacuum, closed-orbit | 3263 | ||
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A 3 GeV Synchrotron (TPS) is proposed in Taiwan. Its storage ring consists of 24 double-bend cells with 6-fold symmetry and the circumference is 518.4m. The report presents the initial design of the fast orbit feedback system (FOFB) for TPS. The system uses 168 BPMs and 168 correct magnets to stabilize global closed orbit at 10 kHz updated rate. The different subsystems are modeled: the BPM systems, the corrector magnet, vacuum chamber, and etc. The latency of the communication and computation is also studied. The preliminary calculation on the stability performance for the orbit feedback system is presented in the report. The FOFB is expected to achieve a submicron stability of the electron beam working at a bandwidth of at least 100 Hz.
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| THPC130 | Integrated Global Orbit Feedback with Slow and Fast Correctors | feedback, brilliance, emittance, storage-ring | 3292 | ||
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The NSLS-II Light Source which is planned to be built at Brookhaven National Laboratory will provide users with ultra-bright synchrotron radiation sources and is designed for horizontal beam emittances <1 nm. Full utilization of the very small emittances and beam sizes requires sub-micron orbit stability in the storage ring. This can be provided by means of a wide bandwidth orbit feedback system. Traditional approach is to utilize a uniform set of fast correctors or use two separate systems with strong slow and weaker fast correctors. In the latter case two systems need to communicate to suppress transients associated with different update rates of corrector settings. In this paper we consider an integrated system with two types of correctors. Its main feature is that setpoints of slow correctors are updated with the same rate as fast correctors; however the bandwidth is limited in order to stay in linear regime. Possible architectures and technical solutions as well as achievable performance are discussed.
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| THPC140 | The Performance of a Fast Closed Orbit Feedback System with Combined Fast and Slow Correctors | feedback, closed-orbit, simulation, vacuum | 3315 | ||
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For NSLSII closed orbit feedback system, in order to reduce the noise caused by the step changes of the power supplies in the feedback system, the angular kick corresponding to the last bit of the power supplies for the fast correctors must be smaller than 3 nrad*. On the other hand, in order to carry out closed orbit alignment or orbit correction after a long term drift, we need strong correctors with 0.8 mrad kick strength*. In order to avoid the requirement of correctors with both large strength and very small minimum step size, we consider separate sets of slow correctors with large strength and fast correctors with smaller maximum strength. In order to avoid fast and slow feedback systems working in parallel, and avoid the possible interaction between two feedback systems, we consider the possibility of using only one fast feedback system with slow correctors periodically removing the DC components of the fast correctors so that the DC components in fast feedback system would not accumulate to reach saturation even after a large long term drift of the closed orbit motion. We report on simulation of the performance of this combined system for NSLSII in this paper.
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* NSLSII Preliminary Design Report (2007) |
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| THPP003 | RF System Design for the EMMA FFAG | controls, coupling, acceleration, linac | 3377 | ||
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In this report the RF system design for EMMA is described. The power source options, power supplies, waveguide distribution scheme and control system is discussed. The architecture necessary to meet the operation specifications requires a large degree of adjustment. To simplify commissioning and enhance the versatility of the machine a complex RF system is desired. This report details the RF "knobs" included to meet this.
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| THPP047 | Prototype of the High Voltage Section for the 2 MeV Electron Cooler at COSY | electron, feedback, acceleration, controls | 3467 | ||
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The design, construction and installation of a 2 MeV electron cooling system for COSY-Juelich is proposed to further boost the luminosity even with strong heating effects of high-density internal targets. In addition the 2 MeV electron cooler for COSY is intended to test some new features of the high energy electron cooler for HESR at FAIR/GSI. The design of the 2 MeV electron cooler will be accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. The design and first experiments of a new developed prototype of the high voltage section, consisting of a gas turbine, magnetic coils and high voltage generator with electronics is reported.
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| THPP071 | Construction of Six-sector FFAG Ring for Muon Phase Rotation | multipole, alignment, injection, vacuum | 3524 | ||
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PRISM is a next-generation of muon source which provides high purity, high intense and high brightness beam. In PRISM, a PRISM-FFAG is one of key section which make a muon beam narrow energy width by using phase rotation technique. To demonstrate the phase rotation, a six-cell FFAG ring has been constructed; the ring consists of full size of scaling-FFAG magnets and a high gradient rf cavity. The experiment is achieved by injecting alpha particles from a radioisotope source as a beam. Construction of the ring has been started from September, 2007; beam duct has been designed and installed, the six FFAG magnets has been aligned, etc. In this paper, we will present the design of the ring and the construction (alignment, etc) from engineering point of view.
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| THPP097 | Commissioning Results of the Kicker Magnet in J-PARC RCS | kicker, extraction, proton, impedance | 3590 | ||
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Installation of the kickers in the extraction section of the RCS in J-PARC facility was completed. And they succeeded to extract the 3GeV proton beams in the first beam test. The operation parameters of the kickers agreed well with the parameters which were estimated from the magnetic field measurement and the current test of the power supplys. In this report, we summarized the results of the excitation test and the commissioning of the kicker magnet. The results of the magnetic field measurement showed the good uniformity in the wide range of the aperture. The characteristic feature of each kicker power supply was also measured precisely. Although the rise time and jitter of the output pulse have some minor variation due to the different characteristics of the thyratrons, the degree of variation was acceptably small. Combining the results of the magnetic field measurements, the relation between the charging voltage and the magnetic field was obtained for each kicker. The accelerated beam was successfully extracted at the operation parameters which were obtained from the relationship. The measurements result which was obtained by using the beam is also reported.
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| THPP120 | Measurements on an A/D Interface Used in the Power Supply Control System of the Main Dipoles of CNAO | dipole, synchrotron, pick-up, controls | 3638 | ||
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The CNAO (the Italian Centre of Oncological Hadrontherapy, near Pavia) is in its final step of construction and is about to be fully operative. It is based on a synchrotron that can accelerate protons up to 250MeV and carbon ions up to 400MeV/u for the treatment of patients. In this paper we describe an A/D interface, used in the power supply control system of the synchrotron main dipoles, called B-Train. The field is measured in a dedicated dipole connected in series with the sixteen ones of the synchrotron and is then fed back to the power supply. The field is obtained integrating and digitizing the voltage induced on a pickup coil inserted in the gap of the seventeenth dipole. The A/D interface under study is based on a 64-channel current to frequency converter ASIC, in CMOS 0.35 μm technology, followed by a counter and uses a recycling integrator technique. The digital signal obtained is then used to generate a feedback signal for control system of the dipoles power supply. We present the electronic structure, the lab measurements and the behavior for various setups of the A/D interface described.
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| THPP121 | The SSRF Storage Ring Dipole and Sextupole Magnet Power Supplies | controls, dipole, sextupole, storage-ring | 3641 | ||
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SSRF is a third generation synchrotron radiation light source. It has a full energy injection storage ring of 3.5GeV. The storage ring dipole magnet string and sextupole magnets strings are powered by 10 large magnet power supplies. The power supply output current ranges from 250A to 800A, and the output voltage ranges from 140V to 840V. These power supplies are digital controlled, with bridge topology, and diode rectifiers with step-down transformers. In this paper, the commissioning results of these power supplies are presented, together with the circuit topology and the control schemes.
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| THPP122 | Fast High-Power Power Supply for Scanning Magnets of CNAO Accelerator | controls, booster, synchrotron, dipole | 3643 | ||
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The paper presents the design aspects and performance measurements of the CNAO Scanning Magnets’ power supply (PS) rated ±550A/±660V and developed in collaboration between OCEM SpA and INFN-CNAO. CNAO is a medical synchrotron producing carbon ions and protons for the cure of deep tumours. The Scanning Magnets are dipole magnets used to move the beam in an x-y plane at the very end of the beam extraction line. The PS current will be set in order to cover the targeted tumour area. To accomplish such a task the specifications of the PS are very stringent: current ramp speed is required to be as fast as 100 kA/s with an overall precision class of 100 ppm. Moreover the wide (20x20 cm2) area to be covered by the beam requires a wide current range. High voltage peaks are required during transients whereas low voltage is needed during steady state. The above characteristics are challenging design issues both with respect to topology and control optimization.
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| THPP123 | Ramping Power Supplies for the SSRF Booster | controls, booster, dipole, feedback | 3646 | ||
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The SSRF booster magnetic field ramped with a 250ms ramp, 2Hz cycle rate, and biased quasi-sinusoidal wave shape is successfully realized. Two Digital Switch-mode Power Supplies (DSPS) separately deliver currents to all dipoles, and other four DSPS deliver to the quadrupoles and sextupoles in families. Tracking precision and reducing line power fluctuation requirements are particularly challenging because of the fast ramp and high inductance load. In order to meet the requirements, the magnetic energy recycle, digital regulation and novel PID correction circuit are used. On Oct. 5th 2007, after a few days commissioning of the SSRF booster, the beam was boosted up to 3.5GeV firstly in SSRF, it proved that the design of ramping power supplies was correct and the manufacture was successful. The power supply system and its performance are described in this paper.
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| THPP125 | Performance Evaluation of the Switching Mode AC Power Supply | booster, controls, dipole, impedance | 3652 | ||
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In order to improve the injection efficiency, the output current waveform of the AC power supplies must be great. Therefore, to ensure smooth and efficient injection of the booster ring, the phase jitter of the AC power supplies current must be less than ±4ns. A new AC power supply is constructed and employ IGBT modules operating at higher switching frequency than the old GTO-based system for the dipole magnet. This new power supply will not only improve the phase jitter but also increase the operating efficiency than the old power supply. The measured dynamic range of the of the 10 Hz sine wave current output is better than 75dB and phase jitter is less than ±4ns. The improved performance evaluation is illustrated in the paper.
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| THPP127 | ATF2 High Availability Power Supplies | controls, diagnostics, monitoring, beam-losses | 3658 | ||
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ATF2 is an accelerator test facility modeled after the final focus beamline envisioned for the ILC. By the end of 2008, KEK plans to commission the ATF2. SLAC and OCEM collaborated on the design of 38 power systems for beamline magnets. The systems range in output power from 1.5 kW to 6 kW. Since high availability is essential for the success of the ILC, Collaborators employed an N+1 modular approach, allowing for redundancy and the use of a single power module rating. This approach increases the availability of the power systems. Common power modules reduces inventory and eases maintenance. Current stability requirements are as tight as 10 ppm. A novel, SLAC-designed 20-bit Ethernet Power Supply Controller provides the required precision current regulation. In this paper, Collaborators present the power system design, the expected reliability, fault immunity features, and the methods for satisfying the control and monitoring challenges. Presented are test results and the status of the power systems.
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| THPP128 | Failure Mechanisms of Power Systems in Particle Accelerator Environments and Strategies for Prevention | radiation, shielding, simulation, proton | 3661 | ||
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This paper discusses the mechanisms that cause degradation and failure in DC-DC converters destined for high radiation and magnetic field environments, particularly those encountered in accelerators. Failure mechanisms discussed include transformer saturation, loss of PWM control, and power supply turn-off. Degradation mechanisms that produce circuit performance outages include circuit parameter drift in Mosfets due to temperature and Vgsth reduction. Environmentally induced drift of current limit, voltage references, and switching performance are also presented. The author’s background in worst case analysis of Space based power supplies gives them particular insight into the radiation impact, assessment, and mitigation of such phenomenon. A variety of techniques for identifying and reducing the probability of these failures are presented. Methods include analysis based strategies, modified switching timing and control, improved gate drive circuitry, proper component selection, and appropriate shielding. Results are provided for a 3kW supply developed for the LHC at CERN using COTS in an 45kRAD TID, 7.7·1012 neutron fluence, and 300 Gauss magnetic field environment.
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| THPP129 | New Generation of AD-measurement Cards for High Accuracy Measurements | controls, shielding | 3664 | ||
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Current transducers, together with the AD conversion of the measured current, are the key elements of high precision power supplies. The accuracy of commercially available current transducers is within the range of a few ppm. Any degradation of this precision by the succeeding stages must be kept as small as possible. Therefore, the accuracy of the AD conversion has to be at least in the same order of magnitude. The presented AD-measurement card improves the accuracy of the available, already calibrated precise ADCs by correcting the remaining errors. The necessary accuracy can only be achieved by measuring and correcting the miscellaneous errors of ADC and involved components, like voltage reference, antialiasing filter and input amplifier. From the measured deviation a correction look-up table is derived and later processed. Other implemented means for the improvement of the precision are the stabilization of the temperature, minimization of the electromagnetic influence by galvanic isolation, reduction of electrical noise and a fully differential signal path.
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| THPP130 | SSRF Magnet Power Supply System | storage-ring, dipole, booster, controls | 3667 | ||
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The Shanghai Synchrotron Radiation Facility (SSRF) is a third-generation synchrotron radiation light source. In SSRF, there are 520 sets of magnet power supplies for the storage ring and 163 sets for injector. All of the power supplies are in PWM switched mode with IGBT. A high precision stable output power supply for 40 dipoles rated at 840A/800V with the stability of ±2·10-5/8hrs is used for the storage ring. 200 sets of chopper type power supplies are used for exciting main winding of quadrupoles independently. In the booster, two sets of dynamic power supplies for dipoles and two sets for quadrupoles run at the biased 2Hz quasi-sinusoidal wave. All above power supplies work with digital power supply controllers designed by either PSI or SINAP. All power supplies are manufactured at professional power supply companies in China.
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| THPP134 | Injection and Extraction DC Magnets Power Supplies for 3GeV Rapid Cycling Synchrotron of J-PARC | extraction, septum, injection, feedback | 3676 | ||
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Proton beams have been successfully accelerated to the design energy of 3 GeV in the RCS at the J-PARC*. In the injection, dump and extraction sections of the RCS, septum magnets, a quadrupole magnet, dc kicker magnets and steering magnets have been installed and operated at DC. For the septum magnets, there is little space area available for the septum coil and a magnetic shield**. Therefore the power supplies are required high excitation current. Maximum currents of the injection and dump septum magnets are less than 7 kA. The extraction septum magnets need the maximum current of 12 kA***. For saving the cost and the installation space of the extraction septum magnets power supplies, a main power supply, which excites three extraction septum magnets in series, and three auxiliary power supplies for adjusting the current to the each magnet are employed. Long-term stability and the current ripples are required to be less than the order of 100 ppm for those power supplies in order to provide the required acceptance for the beams. This presentation shows design and measurements of the the injection and extraction DC power supplies.
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*JAERI Technical Report 2003-044 and KEK Report 2002-13. |
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| THPP136 | The Replacement of the Isis White-circuit Choke | coupling, synchrotron, factory, proton | 3679 | ||
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ISIS, located at the Rutherford Appleton Laboratory is the world’s leading pulsed neutron source. It produces intense bursts of neutrons every 20mS when 800MeV protons are fired into a heavy metal target by an accelerating synchrotron. The ISIS synchrotron is based on a resonant “White Circuit”* allowing superimposed DC and AC currents to circulate in the ring of dipole and quadrupole magnets. The magnets themselves resonate with tuned capacitor banks at 50Hz and a large ten-winding choke allows both a path for the DC component of the current and a means to inject the AC power which maintains the 50Hz AC oscillation. This choke, which dates from the 1960’s, was a veteran of the “NINA” synchrotron in Daresbury before it began service at ISIS. Should it fail it could take at years to repair and a scheme is now well under way to replace it with ten individual chokes with in-situ spares so that the system will gain redundancy and robustness. This paper covers progress to date and the problems that have been encountered and their solutions.
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*M. G. White et al. "A 3-BeV High Intensity Proton Synchrotron," The Princeton-Pennsylvania Accelerator, CERN Symp.1956 Proc., p525. |
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| THPP144 | The Vacuum System for SSRF Storage Ring | vacuum, photon, synchrotron, storage-ring | 3702 | ||
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The vacuum system for SSRF was completed at the end of 2007 and has run for one month without any malfunction. The vacuum chamber for the storage ring made from stainless steel 316LN plate. About 180 absorbers and 80 RF bellows with a single finger structure are used for the storage ring. About 292 compound pumps (SIP+NEG) and 188 TSP are used. After the vacuum system in the straight section of a cell and all pumps in the bending section were baked, the ultimate pressure reached 2×10－8 Pa. Normally, the temperature raise on the chambers any where is less than 4℃ with current 100mA. The temperature raise of the cooling water for all absorbers is less than 3℃. The vacuum control and interlock system are on working order.
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| THPP148 | Implementation of the SSRF Vacuum Control System | controls, vacuum, ion, booster | 3714 | ||
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The Shanghai Synchrotron Radiation Facility (SSRF) is a third generation light source consisting of a 150MeV linac, a full energy booster and a 3.5GeV storage ring. The vacuum control system is a standard hierarchical control system based on EPICS. Serial device servers are used to connect most of vacuum devices such as gauge controllers, pump power supplies to the control network directly and integrated with EPICS using soft IOC. Ethernet based PLC systems are adopted for the valves control, temperature monitor, etc. The soft IOCs are running on the rack servers and the VLAN is used for separate to the other systems. An enhanced distributed archive engine stores runtime data to centre database that using native XML data type with XML schema for data storage. It is a high performance system and running well for daily operation now.
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| THPP150 | LANSCE Vacuum System Refurbishment Plan and Vacuum Alert System Improvements for Predictive Maintenance | vacuum, ion, linac, monitoring | 3717 | ||
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The Los Alamos Neutron Science Center (LANSCE) accelerator, an 800-MeV H+/H- LINAC with a storage ring, has been operated over 30 years since early 1970s. A refurbishment project named LANSCE-R was approved and started in 2007. This paper describes our plan for vacuum system refurbishment as well as an update on the ongoing vacuum email alert system improvement project, which will eventually notify workers of the need for predictive maintenance of particular devices like ion pumps.
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