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Patrick Krejcik LCLS FAC [email protected] du November 11-12, 2008 1 SLAC National Accelerator Laboratory Post-commissioning Controls Enhancements
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20081
SLAC National Accelerator Laboratory
Post-commissioning Controls Enhancements
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20082
SLAC National Accelerator Laboratory
Enhancements that will improve performance, reliability and maintainabilityIncludes deferred items not installed prior to commissioningAs well as improvements based on recent commissioning experienceAnd necessity based on aging plantHardwareSoftware
Overview
… and documentation
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20083
SLAC National Accelerator Laboratory
Hardware Upgrades
Linac controls upgradeTom Himel’s talk addresses mainly Phase I new EPICS controller to bridge to existing CAMAC hardwarePhases II & III involve new hardware & software
BPMsRF and LLRF upgradesTimingMPS Power supplies and controllersNew diagnostics
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20084
SLAC National Accelerator Laboratory
BPMs
Complete Linac BPM upgrade with EPICS digitizersNew BPM cableplant from striplines to processor already installed to 3 locations per linac sectorTiming cable plant to each linac sector also installedInstall VME crates with IOC & EVR together with front end and digitizer in remaining sectorsIn principal agreed to, awaiting account number.
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20085
SLAC National Accelerator Laboratory
RF Systems
Upgrade Phase and Amplitude Detectors (PADs) Replace obsolete, unsupported SLAC PADsWith new LCLS higher resolution digitizersVers. 1 LCLS PAD has bottleneck in the Coldfire PUpgrade with better performing DSP – full BSA
Linac upgrade of MKSU & PIOPsReplace obsolete, unsupported hardwareImprove performance with single pulse RF waveform captureUse embedded timing EVR and optimize design for large number of unitsPreliminary conceptual design with embedded processor, FPGA and PCI
Linac upgrades with sold state subboosters Partially implemented at LCLS injector both reliability and control benefits. Performance and flexibility with individual klystron Phase and Amplitude Control (PAC)
Linac modulator and interlocks upgrade
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20086
SLAC National Accelerator Laboratory
RF Systems (cont.)
Phase reference line and timing fiber backboneBeam based longitudinal feedback on energy and bunch needed to meet performance specificationsFurther stabilizing the reference phase distribution relieves some of the feedback burden and improves performance at low beam rate and recovery from periods of no beam.
Extend the LCLS in-tunnel, temp. stabilized, hard copper phase ref. line to more sectorsDerive new phase reference form the optically stabilized fiber distribution system
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20087
SLAC National Accelerator Laboratory
LBNL Stabilized Fiber SystemJ. Byrd, L. Doolittle, J. Staples, R. Wilcox
New LLRF receiver uses feedforward on RF phase rather than correcting actual fiber length
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20088
SLAC National Accelerator Laboratory
SLAC Test of LBNL Stabilized Fiber
Compare two independently stabilized fibers in the SLAC klystron gallery
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 20089
SLAC National Accelerator Laboratory
Fiber Stabilization ResultsMeasure 25 fs noise in 1 ns fiber length change
Can compensate for 1 ps group delay error from carrier down to 35 fs
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200810
SLAC National Accelerator Laboratory
Timing system
The present LCLS Event Generator (EVG) slaves off the SLC Master Pattern Generator (MPG) via PNET
EVG can take over this role but needs to be programmed with non-LCLS beam codes
Event system hardware is proprietary (MicroResearch Finland)
Have started working on an embedded Event Receiver (EVR) into FPGAs used in generic control modules such as the link node chassis
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200811
SLAC National Accelerator Laboratory
Machine Protection System
LCLS relies on a new MPSOld MPS works via the MPG, which is going away.
Upstream linac will need to be converted to new MPS
In conjunction with linac RF upgrades we will integrate klystrons into new MPS
Preemptive beam abort when a klystron cycles
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200812
SLAC National Accelerator Laboratory
Power Supply Upgrades
Included here mainly for completenessContinue with upgrades to PS Controllers implemented for LCLS
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200813
SLAC National Accelerator Laboratory
New Diagnostics
Restore diagnostics cut from the original planLinac BPMs, Wire scanners, dump screen cameras
As the need arises, support new diagnostics forHigher resolution bunch length measurement
THz spectrometer, X-band TCAV
Bunch arrival time monitoring for both photon and electron bunchesEmittance control: laser heater, foils
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200814
SLAC National Accelerator Laboratory
Software Upgrades
Fast feedbackHigh level applicationsDevelopment environmentRelational DataBase
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200815
SLAC National Accelerator Laboratory
Fast Feedback
Timeslot aware controlsData link to photon experimentsNew dedicated network for feedback IOCs – 120 HzNew project kick off, with new team
Due for completion Jan-2010.
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200816
SLAC National Accelerator Laboratory
Proposed Fast Feedback Architecture
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200817
SLAC National Accelerator Laboratory
High Level Applications
New applications, as the need arises for FEL tuningAlternative online modeling engines (MAD)Start to end simulationsReal time comparison between S2E simulation and beam measurementsEnhance the development framework with a Rich Client Platform (RCP)
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200818
SLAC National Accelerator Laboratory
Software Development Environment
Implement a development platform on separate hardware
Software and application testingSLC users were used to a parallel development machine that could be switched to production
Enhance the software deployment tools
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200819
SLAC National Accelerator Laboratory
Relational Database
Oracle was added after the controls architecture was establishedWe have now become dependant on the RDB
Config control, online model etcValidation of consistency between EPICS and Oracle has become key
But, still waiting to hire a DB engineerUltimately move to a situation where Oracle is the master of the EPICS distributed DBs.
Patrick Krejcik
LCLS FAC [email protected]
November 11-12, 200820
SLAC National Accelerator Laboratory
Further out
Interleaved operation of multiple undulator beamlinesApproval of upstream PPA programs such as FACET, requiring controls upgrades to the remainder of the linac to comply with new systemsBoth of these require simultaneous operation of multiple beams on different timeslots
