Transcript Post-Commissioning Controls Enhancements

SLAC National Accelerator Laboratory
Post-commissioning
Controls Enhancements
November 11-12, 2008
LCLS FAC
1
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
2
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
3
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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.
November 11-12, 2008
LCLS FAC
4
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
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Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
6
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
LBNL Stabilized Fiber System
J. Byrd, L. Doolittle, J. Staples, R. Wilcox
New LLRF receiver uses feedforward on RF phase
rather than correcting actual fiber length
November 11-12, 2008
LCLS FAC
7
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
SLAC Test of LBNL Stabilized Fiber
Compare two independently stabilized fibers in the
SLAC klystron gallery
November 11-12, 2008
LCLS FAC
8
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
9
Patrick Krejcik
[email protected]
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
November 11-12, 2008
LCLS FAC
10
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
11
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
Power Supply Upgrades
Included here mainly for completeness
Continue with upgrades to PS Controllers
implemented for LCLS
November 11-12, 2008
LCLS FAC
12
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
13
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
Software Upgrades
Fast feedback
High level applications
Development environment
Relational DataBase
November 11-12, 2008
LCLS FAC
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Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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.
November 11-12, 2008
LCLS FAC
15
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
Proposed Fast Feedback Architecture
November 11-12, 2008
LCLS FAC
16
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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)
November 11-12, 2008
LCLS FAC
17
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
18
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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.
November 11-12, 2008
LCLS FAC
19
Patrick Krejcik
[email protected]
SLAC National Accelerator Laboratory
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
November 11-12, 2008
LCLS FAC
20
Patrick Krejcik
[email protected]