Chen, C S

Chen, J

Hsu, K T

Hsu, S Y

Hu, K H

Kuo, C H

Lee, S H

Ueng, T S

Wang, C J

CERN Document Server

UPDATE OF THE CONTROL SYSTEM AT  SRRCK. T. Hsu, C. J. Wang, Jenny Chen, C. H. Kuo, C. S. Chen, K. H. Hu, S. H. Lee,S. Y. Hsu, T. S. Ueng,   Synchrotron Radiation Research Center, Hsinchu, TaiwanAbstractThe control system of accelerator complex at SRRCwork well since its dedication in 1993. Several majorupgrade projects will finish in the early of nextmillennium to improve performance of the light source.Injector of SRRC will run in 1.5 GeV in 2000 withrejuvenated control system that has been integrated tomain control system recently. Orbit feedback system isdeveloped to improve orbit stability. The RF controlsystem will upgrade to accompany with superconductivityRF cavity project that is expected finish in 2001-2002.These developments in control system of SRRC aresummarized in this report.1 INTRODUCTIONThe storage ring of SRRC has been run near sevenyears. Several major upgrades will be done within 1999-2002 to improve performance of the storage ring. Controlsystem is a two-level hierarchical system [1]. The upperlayer consists of two process computers; several consoleworkstations and PCs. Process computer are used ascontrol server. Consoles are mainly used for user interface.The lower layer consists of many VME crates field levelcontrollers which routinely perform the local dataacquisition, interlock generation and carry out devicescontrol requests from the control consoles or processcomputers. Flexible and openness makes control systemupgrade easily.2 STATUS IN SRRC CONTROL SYSTEMOld VAX/VMS consoles has been migrated toAlpha/Unix environment in 1996. PC/WindowsNTconsole was implemented in mid-1997. Porting controlenvironment to PC/Linux environment has been done inearly of 1999. Control applications are increasing itsdemands to the bandwidth of control network. To transmitlarge data block, image and video information via controlnetwork without degrade performance, upgrade backboneto gigabits Ethernet is under way. Routing andsegmentation of 10 Mbits/sec nodes, which cannotupgrade in control system, is a provisional solution toincrease overall network performance. Many new controlapplications was developed based on X-Windows andMotif widgets. Various commercial tools (PV-WAVE,LabVIEW, MATLAB, …etc.) adopt to reducedevelopment efforts. VME crate system equips withtransient digitizers to acquire waveform and spectrum.Injection kickers and RF cavities occupy two longstraight sections. The remained four long straight sectionsare available for insertion devices. Four insertion devicesinclude a wiggler (W20), and three undulators (U5, U9,and EPU5.6) have been installed. A 3-poles, 6 Tsuperconductivity wiggler is in implementation phase.Orbit is sensitive to the operation of undulators in lowenergy machine like SRRC. Usually, a pre-defined tablestored correctors setting value as function of gap, updateend-correctors setting are done during gap change.However, several undulators move simultaneously or gapaccompanies with phase change is a big challenge in orbitcontrol. It’s seemed orbit feedback system is a bettersolution than feed-forward manner.Efforts was devoted to simplify and to re-engineeringthe control system. These activity are multi-purpose,includes performance improvement, avoid obsolete andreduce maintenance difficulties. Re-engineering of theinjector control system is an example of these efforts.3 HIGHLIGHT OF SOME NEWDEVELOPMENTS IN CONTROL SYSTEM3.1 Insertion Devices ControlIDs control in SRRC is in heterogeneous manner [2].Local controller of wiggler W20 is in PC/LabVIEWenvironment. The U5 local control software running inPC/MS-DOS environment. Both local controllers of W20and U5 connected to VME crate via IEEE-488 bus.Undulators U9 and EPU5.6 control are compatible withSRRC control environment which are based upon VMEcrate equip with PowerPC CPU running LynxOS. The U5system executes gap move request within a few secondsfor mm range move. Control system overhead contributesabout half of the elapse time for the operation. This is dueto the slowly response in local controller through IEEE-488 interface. Overhead of the control system is almostnegligible in EPU5.6 and U9. Re-engineering of W20 andU5 control is under planning to improve its performance.Software of EPU5.6 is shown in Figure 1. All IDs willshare similar hardware and software structure in nearfuture.Residue field compensation scheme has “fixed” and“follow” gap operation mode. Feed-forward control inorbit is used to reduce orbit excursion. Eliminate orbitchange during IDs motion by using orbit feedback thatcombines global and local are also available. It is shownthat orbit feedback system is effective to lock orbit indynamic operation of IDs during user shift. A few micronsin RMS orbit displacement control achieve duringmultiple IDs motion either in gap or in magnetic phase.Further improve in orbit control performance is under way.Beamline user can send command to control server orVME crates to perform limited gap/phase setting andstopping. Status of IDs is always available for query inInternational Conference on Accelerator and Large Experimental Physics Control Systems140International Conference  Accel rator and L rge Experim ntal Physics Control Systems, 1999, Trieste, Italycontrol system. Synchronized ID operation withmonochromator in beamline is supported.Setting Service  ProcessDDB Upload  ProcessID Service  ProcessMain Control ProgramsBeamline ID Access ProgramConsole  ComputerID Local ControllerDynamic DatabaseGeneral Reading ProcessAnalog InputDigital InputMotion ControllerAnalog OutputDigital OutputMotor Drivers, Limit SwitchesPower SuppliesMotor Information Update & Corrector Follow Gap /Phase ControlTilt sensors Temperature sensors ... etcFigure 1: Structure of the EPU5.6 control software.3.2 Orbit Feedback SystemGlobal orbit feedback system operates routinely [3].Present system composed VME crates to handle orbitacquisition, correctors control, and photon beam positionmonitor data acquisition. These crates share orbitinformation with reflective memory network.  Orbitacquisition VME crate systems host PowerPC runningLynxOS and support various operation modes. The orbitsampling rate is 1 kHz currently. The corrector controlVME crate is also in PowerPC/LynxOS environment. Thefeedback DSP modules are located on corrector crate.Current efforts are focus to improve the performance ofthe feedback loops on various operation conditions. Localorbit feedback loop using electron and photon beamposition monitors is under intensive test. Upgrade DSPsystem to new generation board equips withTMS320C6701s is in implementation phase. Fast DSPsprovide flexibility to include more BPMs and correctors infeedback loops and flexibility in control rule selection.3.3 Phase Space MonitorPhase space monitor was implemented by using 500MHz log-ratio detectors and VME based transientdigitizers. One transverse plane composes two BPMs withappropriate phase advance to measurement position andangle. Transient digitizers installed in VME crate are usedto acquire turn-by-turn beam position. A server programhosted on VME crate manages the operation ofmeasurement. Client program on console providesoperation interface. Time-domain and frequency-domainraw data display is supported. User interface to operatephase monitor display is shown in Figure 2. Digitizerconfiguration, kicker firing and related parameter changecan be done by the aid of this user interface.Figure 2. Phase space monitor user interface, 3νx ~ 22.3.4 New Control System of the SRRC 1.5 GeVInjectorThe turnkey injector system composed a 50 MeV linacand a 1.3 GeV electron booster synchrotron. The controlsystem consists a Bitbus network and one PLC in fieldlevel. Both systems are connected to a PC running iRMXIII operation system. A VAXstation uses as controlconsole. It is difficult to maintain and to operate theinjector control system due to its close nature, out-of-datein hardware and software.Re-engineering of the old injector control systemfinished in June 1999 [4]. PC/iRMX III system andVAXstation was obsolete. New control system kept PLCand most of the Bitbus nodes to save money. VME cratessystem access injector devices as shown in Figure 3. Theoperations of the injector are done on standard controlconsole in renewed system. The integration wasperformed during the injector in standby mode after everystorage ring fill cycle. This live upgrade strategicminimized interferes to the normal operation of thestorage ring.Upgrade booster to operate at 1.5 GeV is scheduled inJanuary 2000. Power supplies and chokes of the Whitecircuits should be replaced. New IGBT based switchingpower supplies provide superior performance comparewith old ones. Magnet of the booster excite by 10 Hzsinewave, PID controller are used to regulate amplitudeand phase of the booster AC power supplies. Thisregulation is essential to compensate thermal effects ofmagnets and chokes. The White circuit controlenvironment is shown in Figure 4.3.5 Control Environment of theSuperconductivity RF SystemTwo existing DORIS cavity will replaced by a CESRB-cell superconductivity RF (SRF) cavity in year of 2001-2002. The goal is to increase stored beam current to 500mA and eliminate coupled-bunch instabilities. Low beamcoupling impedance due to strong HOM damping willincrease beam current threshold drastically. The SRFcavity will install in CESR B-cell cyromodule. Existinglow level RF system will modify to accommodate newSRF system in high beam loading condition.141CPU 928I/OSiemens S5-135U PLCCP 143 H1/TCP/IPGun, Linac, Booster Vacuum Control & MonitoringEthernet Switching System with Gigabits BackboneTCP/IP, UDP/IPSRRC Console ComputersI/O I/OI/O I/OI/OExpansion CrateNew DC &AC Power Supplies Dipole, FQ, DQ  DDCPS 1300 A/136 V FQDCPS 160 A/120 V DQDCPS 160 A/120 V DACPS 420 Apeak/550 Vpeak FQACPS 45 Apeak/440 Vpeak DQACPS 45 Apeak/440 VpeakRS-422 On, Off, Reset, Read Status, ... etc.Personal Workstation 500/600 au PC/WindowsNTAlphaServer 1000A 5/400 & AlphaServer DS20 6/500SRRC Control EnvironmentPersonal Workstation 500/600 auBitbus Node 19 (FTS) Fast Timing SystemBitbus Node 14 (DCMC) Dipole CorrectorBitbus Node 16 (IBLC) LTB BeamlineBitbus Node 17 (RFCI) Booster RF Bitbus Node 1F (KIPS) Injection KickerBitbus Node 1D (SIPS) Injection Septum Bitbus Node 1C (BEPS3) Extrection Bumper #3Bitbus Node 1A (BEPS1) Extraction Bumper #3Bitbus Node 20 (KEPS) Extraction KickerBitbus Node 1B (BEPS2) Extraaction Bumper #2Bitbus Node 1E (SEPS) Extraction BumperPC/LinuxTo 1.5 GeV Storage Ring and Transport Line SystemQuadrupole, Sextupole Trim Magnet Power SuppliesCES RIO2-8061I/ODigital Delay GeneratorTime to Digital Converter10 Hz Sinewave GeneratorACPS Interlock ModuleADC ModuleDAC ModuleBitbus InterfaceCES RIO2-8061I/OI/OPLC, Bitbus Interface VME crateCES RIO2-8061Waveform GeneratorBitbus InterfaceWhite Circuit Interface VME CrateAnalog Input, Analog Output, Timing, InterlockBitbus Network1.5 GeV Injector Field DevicesFigure 3. 1.5 GeV booster control system16 Bits, 6 ch DAC DVME 626Clock Distribution B960AC Power SupplyDACPSFQACPSDQACPSAmplitude/Phase Detection Module16 Bits, 32 ch ADC VMIVME 3122ACPS AmplitudePhase10 Hz Clock3333Digital Delay Generator B951Time to Digital Converter B980High Purity 10 Hz Sinewave Generator and Amplitude Regulator3310 Hz Clock Input10 MHz Clock Input3 from DC Power Supplya.  to TDC x 1 b.  to DDGx 1 c.  Spare x 1to High Purity 10 Hz Sinewave Generator x 33to DC Power SupplyCPU Module RIO2 8061DDCPSFQDCPSDQDCPSall Power Supplies (On/Off Control Read Status Reset etc. ...)RS422SRRC 10HzSG x 3Dipole DCCTFQ DCCTDQ DCCTVME Crate 10/100 Mbit/s EthernetFigure 4. 1.5 GeV booster power supply control interfaceUpgrade RF transmitters to increase output power arealso scheduled. Intelligent controllers are used to regulatecrucial parameters, such as temperature, liquid helium(LHe) level, pressure, … etc. These controllers connect toVME crate by serial links. Various signals are alsoacquired with multi-channels ADC module to monitor theoperation of SRF system. Transient digitizer will recordrelevant events to aid the operation and debug the SRFsystem. The conceptual of control environment is shownin Figure 5. Various high level applications will aid RFconditioning, cold start, shutdown, and normal operation.RS-232 InterfaceCESR B-cell CryomoduleLow Level RF SystemTransmitterTransient DigitizerCPU ModuleControl Network* Control and monitoring * Display * Conditioning &    RF processing * Operation sequence * Data logger & brower * Alarm & report *       ... etc.Control ConsoleCryogenic Feedback LoopLHe level regulatorLHe pressure regulatorHEX gas flow regulator- Gap voltage - Tunner     position - Phase - field level - forward pwr - reverse pwr - temp - flow - RE relatedBeam currentVacuumPowerADCADCDACDigital InputDigital OutputSRF VME CrateSignal ConditioningFigure 5. Superconductivity RF system – controlenvironments4 SUMMARYControl system in SRRC is enhanced to support severalmajor upgrades in accelerator system. Improvement inopenness of the control system made the system moreflexibility. Unify control environment in acceleratorsystem are helpful to improve efficient of resource usage.Various activities in control system include hardwareupgrade and adopt modern software technology areessential to improvement the performance of theaccelerator system.REFERENCES[1] C. J. Wang et al., “The Design Schemes of GraphicUser Interface Database and Intelligent LocalController in the SRRC Control System”, NIM A352(1994) 300-305.[2] Jenny Chen, et al., “Control Issues of InsertionDevices”, PAC’99, New York City, U.S.A.[3] C. H. Kuo, et al., “Digital Global Orbit FeedbackSystem Developing in SRRC”, and “Local FeedbackExperiment in the Taiwan Light Source”, PAC’97,Vancouver, Canada.[4] C. J. Wang, et al., “The Integration of Booster andStorage Ring Control System in SynchrotronRadiation Research Center”, These Proceedings.142

Update of the Control System at SRRC

Update of the Control System at SRRC

Abstract

Similar works

Full text

Available Versions

CERN Document Server