Injector/Linac Controls
An overview of the status of each of the controls
subsystems will be presented…
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – LLRF
Our goal for fast digitization:
14 bits (to get 12 effective bits) or 74 dB SINAD
119 MSPS with a minimum of 40 MSPS to meet
bandwidth requirement of 20 MHz
There are chips that come close to this (esp. @ 40
MHz). Example is TI ADS5500 but it’s not yet
available on an off-the-shelf VME board
customized board (or wait until on-the-shelf)
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – Diagnostics
Work is underway to set up a test area in FFTB
and in buildings 407 and 406
What we have already:
Network switch in place in bldg 407
EVG/EVR on loan from SLS
Spare Linac stripline BPMs will be installed in
FFTB
Spare WS will be installed in FFTB
Libera BPM control module purchase req in
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – Diagnostics
What we need to purchase:
Libera BPM module
Controls cables will be installed between FFTB
and bldg 406 (earliest Jan.05)
VME crate with slot 0 controller
What we need to build:
Ceramic BPM prototypes will be developed
Need PNET board to (intf: SLC MPG to EVG)
What we need to design and build:
Bunch Length Monitoring (CSR/OTR/CTR)
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector Controls – Drive laser
Controls has had input into content of RFI, RFP
and follow-up questions to 5 vendors
The specifications are:
VME arch is preferred
EPICS CA is comm protocol
500 msec response to commands
1 Hz update of all monitored values
RF pulse with 360 Hz fiducial is available
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector Controls – Drive laser
Vendors’ responses:
are light in detail;
none say they will use VME
where details are given, they indicate LabView
on Windows XP speaking Channel Access
protocol
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector Controls – Drive laser
What this means:
Timestamps may not be synchronized at all
pulse to pulse
It is unknown how they will synchronize when
LCLS is running at a subharmonic of the clock 120 Hz, 10 Hz, 1 Hz
Windows is another OS to maintain (upgrades,
patches to perform, EPICS builds/debugging
when things cease to work)
Labview is another licensed s/w package to
maintain
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – Timing
EVG 100 and EVR 100 on loan from SLS until end
of Feb., 2005
Manufacturer estimates that EVG 200 and EVR
200 ready for market between Nov. 2004 and May
2005
This system still needs PNET board (see
Stephanie Allison’s talk)
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – Vacuum
We have postponed vacuum activities to next
calendar year
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls – Power supplies
Kristi Luchini joins LCLS mid-October, focusing on
this task
Evaluation of ESD design development (Dave
McNair)
Testing and integration of SLS power supply
system
Evaluation of Diamond Light Source
implementation of SLS PS controllers with
redundant power modules
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector Controls – PPS,MPS,BCS
PPS PLC prototyping in progress
Working towards a Citizen Review of a PLC-based
PPS
MPS requirements being collected 15 msec turn off time
Modal control pulse to pulse (integration with the
EVG)
Two mitigation devices: drive laser and kicker
magnet
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Injector/Linac Controls –
Conventional Facilities
A/C Power – approved by mgmt to add in all 10
sectors
24 V Power – not yet added to all 10 sectors
Cabling – new safety requirements next March will
specify “low-smoke, non-halogenated cable” that
means additional cost
Cable Tray design in progress
Data will be timestamped within 500 msec of beam
pulse
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu
Linac Controls – Conclusions
Timestamps and triggering may not be
synchronized pulse to pulse in the injector drive
laser (controls may need additional effort to be
budgeted)
Some uncertainty in date of availability of
EVG/EVR timing boards
Cabling costs will increase due to change in safety
requirements next year
There’s still lots to do and lots of risks we can
minimize/eliminate by prototyping!
October 12, 2004
Facility Advisory Committee Meeting
Dayle Kotturi
dayle@slac.stanford.edu