Hamid Shoaee LCLS Facility Advisory Committee [email protected]October 2006 1 Control System Overview October 12, 2006 Hamid Shoaee for the LCLS Controls Group Outline Goals & Commissioning Schedule Injector Control System Installation Responses to FAC Concerns Status update Summary
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Hamid Shoaee LCLS Facility Advisory Committee [email protected] October 2006 1 Control System Overview October 12, 2006 Hamid Shoaee for the LCLS.
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The focus in the past six months has been timely installation of the injector Controls
Complete the design of critical systems and follow through with system productionAccelerate procurement activities to ensure availability for installationAlign cable plant design and procurement with the project-wide installation scheduleCollaborate with the physicists to ensure the availability of required software tools for machine commissioning
July 24July 24 S20 ready for laser installationS20 ready for laser installationAug 29Aug 29 Laser installation completeLaser installation completeDec 18Dec 18 Virtual cathode fully characterized (ready to install gun)Virtual cathode fully characterized (ready to install gun)Dec 19Dec 19 RF gun installation starts (10 days) + pre-beam checkoutRF gun installation starts (10 days) + pre-beam checkoutDec 18-Jan 1Dec 18-Jan 1 HolidaysHolidaysJan 2Jan 2 VVS’s switched on (RF power available)VVS’s switched on (RF power available)Jan 12Jan 12 First laser UV-light on cathodeFirst laser UV-light on cathodeJan 12-Feb 4Jan 12-Feb 4 Electron commissioning in GTL and gun-spectrometer onlyElectron commissioning in GTL and gun-spectrometer onlyJan 12-Feb 4Jan 12-Feb 4 RF processing L0a, L0b, Tcav (and gun: already processed)RF processing L0a, L0b, Tcav (and gun: already processed)Feb 4Feb 4 Latest start for L1 and X-band processing (assumed 15 days)Latest start for L1 and X-band processing (assumed 15 days)Feb 5Feb 5 Beam into L0a, L0b and down to SAB – Beam into L0a, L0b and down to SAB – L0a,b proc. completeL0a,b proc. completeFeb 20Feb 20 Beam into L1 linac (to TD11 dump) - Beam into L1 linac (to TD11 dump) - L1, X-band proc. completeL1, X-band proc. complete~June~June Take beam down full linac (to BSY SL2 stopper)Take beam down full linac (to BSY SL2 stopper)
Vault/Linac CheckoutsPower on access: Check polarity of magnets Read-backs , Motion controller: Exercise motion-control YAG/OTR camera images: Use Alignment laser to define screen center
Pre-Beam preparation Laser stabilization system Fiducializing of real cathode location w.r.t virtual cathode LLRF for Gun, L0a, L0b (Volt. feedback, Phase Lock) Start conditioning (Gun, L0a, L0b) if PPS ready
Dark current measurement if FC1 ready Vacuum pumps and gauges reading available
Installation details will be presented in the breakout session
With a few exceptions the procurement of control components has been completedWhile the majority of subsystems will be installed on time, a few will be just in time delivery, including BPMs and Toroids electronics.Systems are typically checked out on test stands, and field installation will be done by Davis-Bacon contractors.
Production Systems DeliveredNetworks at S20 RF Hut & MCC: physical and wireless
LCLSDMZ, LCLS private, wirelessMCC infrastructure built: power & racksFirst group of LINUX RHEL4 Servers:
2 applications, 2 EPICS archiver
Control Room Linux Workstation – 4 (24-inch) monitor & 2 monitor configurations
Control Room StationsS20 Laser Room is actively in use to commission laserMain Control Center (MCC) Control Room space is allocated, installing 3 Workstations & laptop work areasMCC Foyer: space for SUNray & laptop work areas
Working on applications and migrating to production environments.Error LogsArtemis LCLS area existsOperations and Physics E-logs createdCyber Security Protection Program (CSPP) Update Completed – MCC enclave included LCLS accelerator controlsAIP network upgrade at MCC for gigabit traffic to support digital control room
The controls group made the wise decision to extend the 1553 MPS system for the injector turn-on and will later continue development of the newer MPS system (which is needed to respond in 1 pulse rather than the 3 pulse response time of the 1553 MPS system). An update on MPS progress should be presented at the next FAC meeting. In addition to implementing the 1553 system, further work should be done on the new system.
There will be a presentation on the MPS in the breakout session.
Work has been done on the design of the linac MPS and a design review will be held in November
They still have a tight schedule. There has been progress since the last review, but no decision has been taken on which digitizer to use yet. This decision should be taken very soon.
The schedule is still very tight. However we have selected a digitizer and the details will be presented at the breakout session
FAC Response 3 – Cost, Schedule, cable plant concerns
Management has changed. [Hamid] has made some changes and does think they can support an on time injector commissioning with some temporary solutions. We agree with the latter statement and believe the schedule will be very tight. Particular attention is needed for the cables in the linac which must be installed in the coming shutdown. We support Hamid’s plan to rework the schedule and cost estimates.
Linac Cable plant installation is proceeding well and will be completed during the shutdown.
There has been a bottom up cost estimate of the control system
It seems like now there is less emphasis on using COTS solutions. Increase that emphasis please. For example the plan has been to use a commercial card for the timing system, but now they are thinking of getting rights to the design and modifying it to remove unused functionality and reduce cost. We highly doubt this would be worth the engineering effort.
All timing system electronics have been procured from the manufacturer. There are no plans to produce them locally.
With a few exceptions, most of the controls electronics consist of commercial boards: exceptions include BPM & Toroid AFE, LLRF.
Different groups may be using different embedded IOCs. See if they can be standardized. Don’t do this if it is so late in the development cycle that the change would be highly disruptive.
A single embedded IOC board is being used on a number of systems including BPM, Toroid, BLM, LLRF
Controls would benefit from a full time deputy and designated technical leads for each technical area. The latter would be people who spend 25% of their time on management and do technical work the rest of the time.
The recently revised controls budget includes a deputy position which will be posted shortly.
PPSLCLS Injector PPS Reviews are CompleteRSC ‘conditional approval’ obtainedHardware drawings, wiring diagrams are complete; installation in progress
BCSPrevents radiation from ‘escaping’ the shielding enclosureDirect measurements of radiation or beam lossProtection of safety-critical collimators and stoppers Hardware is nearing readiness for installationOriginal ‘Mode-switching’ BCS proposal has been sidelined for nowPropose an ‘Interim BCS’ where conservatively “All BCS faults shut-off all Guns.”
Interim MPS Using existing linac infrastructure (1553 MPS)Adding new signals and devicesInterim MPS will be used for gating beam
Single Shot ModeBurst Mode
MPS algorithm is responsible for both LCLS and CID beamPockels cell and MPS mechanical shutter limit laser rate on cathodeHardware procurement is almost complete and installation will be completed in early December
The injector laser stabilization system includes two feedback loops
The first loop includes two mirrors, each with two actuators and one camera. It stabilizes laser traveling through a 10-meter tubeThe second loop includes one mirror with two actuators and adjusts the laser position on the cathode.
The IOC reads the image from camera, calculates the laser’s position error and applies a correction to the actuators.The loop operates @ 1 Hz, and the camera is synced to 120Hz.
The prototype of the first loop has been tested for several months and works well.
We have a total 14 Toroids and 2 Faraday cups of which 6 Toroids and 2 Faraday cups are needed for commissioning
Beam Charge Monitor Chassis is built in SLAC to handle signal conditioning, integration and MPS interface.
Acromag IP330 ADC is used in IOC to interface with Beam Charge Monitor Chassis. Since the existing EPICS driver did not match our requirement, a brand new driver developed.
4-Channel fast ADC is built at SLAC to image dark current for FC01, FCG1 and IM01, IM02(optional).
7 Wire Scanners for Injection CommissioningHardware Assembled, Tested (without beam), Calibrated, and currently being installedSoftware is 80% completeRequire further testing of PMTs and Ion Chambers for acquisition of Wire data
LLRF Distribution Scope of Work – Injector Turn-on
Sector 20 RF distribution systemPhase and Amplitude Controllers (PACs) – 5 unitsPhase and Amplitude Detectors (PAD) – 2 unitsPhased Locked Oscillator – Use SPPS unit for Turn OnLO Generator – Complete - 50% tested – looks good so farMultiplier – 476MHz to 2856MHz – Complete 75% Tested4 distribution chassis – Complete 102MHz, 2056MHz, 2830.5MHzLaser Phase Measurement – in Design, diagnostic, not required for turn on – Laser group wants it next week. Distribution Amplifiers – 10W, 2850MHz due Oct 25, 102MHz Amp being built
LLRF Control and Monitor System1 kW Solid State S-Band Amplifiers – 5 units – Design Complete, In FabPAD – 12 units – 6 required for turn on PAC – 6 unitsBunch Length Monitor Interface – awaiting Specs
Beam Phase CavityWill use single channel of PAD ChassisPill box cavity with 2 probes and 4 tuners – 2805MHz 3 units Complete
11:30am Controls Organization Overview H. Shoaee12:00pm Injector/Linac Controls Installation R. Fuller12:30 Lunch (FAC members only) 1:30pm High-Level Applications & Feedback D. Fairley 2:00pm Timing Systems Update P. Krejcik 2:30pm PLC-based PPS M. Saleski 3:00pm BPM Update S. Smith 3:30pm Break 4:00pm Machine Protection System S. Norum
ConclusionsGreat progress has been made in the past six months towards readiness for injector installationWhile the majority of Controls subsystems will be installed on time, a few will be just in time deliveryAn ETC exercise has identified and fixed a number shortcomings in the baseline budgetThe collaboration with other departments at SLAC has proven very productiveWhile commissioning the injector, we need to be aware of the installation schedule for the rest of the machine including the experimental areasThrough collaboration with the physics group are ensuring the availability of required applications software for injector commissioning.