Post-commissioning Controls Enhancements

1. Post-commissioning Controls Enhancements

2. Overview • Enhancements that will improve performance, reliability and maintainability • Includes deferred items not installed prior to commissioning • As well as improvements based on recent commissioning experience • And necessity based on aging plant • Hardware • Software … and documentation

3. Hardware Upgrades • Linac controls upgrade • Tom Himel’s talk addresses mainly Phase I new EPICS controller to bridge to existing CAMAC hardware • Phases II & III involve new hardware & software • BPMs • RF and LLRF upgrades • Timing • MPS • Power supplies and controllers • New diagnostics

4. BPMs • Complete Linac BPM upgrade with EPICS digitizers • New BPM cableplant from striplines to processor already installed to 3 locations per linac sector • Timing cable plant to each linac sector also installed • Install VME crates with IOC & EVR together with front end and digitizer in remaining sectors • In principal agreed to, awaiting account number.

5. RF Systems • Upgrade Phase and Amplitude Detectors (PADs) • Replace obsolete, unsupported SLAC PADs With new LCLS higher resolution digitizers • Vers. 1 LCLS PAD has bottleneck in the Coldfire mP • Upgrade with better performing DSP – full BSA • Linac upgrade of MKSU & PIOPs • Replace obsolete, unsupported hardware • Improve performance with single pulse RF waveform capture • Use embedded timing EVR and optimize design for large number of units • Preliminary 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

6. RF Systems (cont.) • Phase reference line and timing fiber backbone • Beam based longitudinal feedback on energy and bunch needed to meet performance specifications • Further 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 sectors • Derive new phase reference form the optically stabilized fiber distribution system

7. 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

8. SLAC Test of LBNL Stabilized Fiber Compare two independently stabilized fibers in the SLAC klystron gallery

9. Fiber Stabilization Results Measure 25 fs noise in 1 ns fiber length change Can compensate for 1 ps group delay error from carrier down to 35 fs

10. 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

11. Machine Protection System • LCLS relies on a new MPS • Old 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

12. Power Supply Upgrades • Included here mainly for completeness • Continue with upgrades to PS Controllers implemented for LCLS

13. New Diagnostics • Restore diagnostics cut from the original plan • Linac BPMs, Wire scanners, dump screen cameras • As the need arises, support new diagnostics for • Higher resolution bunch length measurement • THz spectrometer, X-band TCAV • Bunch arrival time monitoring for both photon and electron bunches • Emittance control: laser heater, foils

14. Software Upgrades • Fast feedback • High level applications • Development environment • Relational DataBase

15. Fast Feedback • Timeslot aware controls • Data link to photon experiments • New dedicated network for feedback IOCs – 120 Hz • New project kick off, with new team • Due for completion Jan-2010.

16. Proposed Fast Feedback Architecture

17. High Level Applications • New applications, as the need arises for FEL tuning • Alternative online modeling engines (MAD) • Start to end simulations • Real time comparison between S2E simulation and beam measurements • Enhance the development framework with a Rich Client Platform (RCP)

18. Software Development Environment • Implement a development platform on separate hardware • Software and application testing • SLC users were used to a parallel development machine that could be switched to production • Enhance the software deployment tools

19. Relational Database • Oracle was added after the controls architecture was established • We have now become dependant on the RDB • Config control, online model etc • Validation of consistency between EPICS and Oracle has become key • But, still waiting to hire a DB engineer • Ultimately move to a situation where Oracle is the master of the EPICS distributed DBs.

20. Further out • Interleaved operation of multiple undulator beamlines • Approval of upstream PPA programs such as FACET, requiring controls upgrades to the remainder of the linac to comply with new systems • Both of these require simultaneous operation of multiple beams on different timeslots