AWAKE RF Synchronization and LLRF Budget Review
Reported by Wolfgang Hofle
Acknowledgement: A. Butterworth, H. Damerau, S. Doebbert, J. Molendijk, S. Rey (BE/RF)
10 December 2014
AWAKE Experimental Layout
electrons
wakefield potential
Synchronize a three beam system:• SPS proton bunch• LASER pulse• RF gun and electron
acceleration
Provide RF clocks to• experiment• instrumentation
Edda Gschwendtner, CERN
3
CERN
CNGS
SPS
Edda Gschwendtner, CERN
SPS BA2
SPS BA3SPS RF
SPS BA4
AWAKE RF Fiber links
existing RFFiber links
existing RFFiber linksto LHC RF
4Edda Gschwendtner, CERN
Layout of the AWAKE Experiment
LLRF/synchronization(protected from radiation)
Klystron drive
Clock distribution (subject to future specification)
Note: exact locations of electronicssubject to integration studies
ps triggerfor streak camera !
Power supply UPS ?
Synchronization signals
CERN BE/RF
1 pulse every 5 SPS turns
RF reference frequency (+/- 1 kHz)
laser pulse picker
10Mhz reference for synchronization of instrumentation etc.
Alternative (optional):make RF sourceat 3 GHz or 3 GHz – fo masterin case difficultieswith x34 harm. multiplier
MASTER
3 GHz LLRF
Clock GenerationFiber Optic link (FO)
based on T. Bohl, A. Butterworth
Fiber Optic link – SPS synchronisation
• 4 fibers for evaluation doneEN/EL provided existing fibers free of charge for temporary use
• 10 fibers for final installation BA3 FC AWAKE (central AWAKE budget)• 2 LHC RF VME style crates with FO links 30 kCHF• Hardware prototyping for phase compensation 30 kCHF• Production and spares 25 kCHF• Instrumentation to monitor phase drift 20 kCHF (collaboration)• Oscilloscopes to monitor transmitted pulses 45 kCHF• GPS antenna, computers, local cabling 19 kCHF• FSU for installation / assembly 30 kCHFTotal: 174 kCHF + 20 kCHF
• Note: Any adaptation of SPS beam control side link assumed absorbed in SPS operations • Assumption: Extraction to AWAKE looks to SPS similar to an extraction to LHC and uses the
same hardware in the SPS
Clock Generation – 3 GHz LLRF• 1 LHC RF VME style 15 kCHF• Prototype clock generation and klystron LL drive 25 kCHF• Production clock generation 30 kCHF• Spares for VME & clock generation 15 kCHF• PLC control (phase shifters/motors) 10 kCHF• Local cabling, clocks fan-out, computers 24 kCHF• FSU for installation / assembly 30 kCHF• GPS 10 MHz reference: 20 kCHF (from collaboration)• RF source to replace Modelocker during off-time (from collaboration ?) 30 kCHF
Total: 149 kCHF + 20 kCHF + 30 kCHF
• clock generation includes 25 kCHF provision for “fast timing” • responsibility of clock and fast timing distribution to clarify (location of hand-over)• cabling of clocks to users (BI, experiment) not included in budget• Commercial digitizers / acquisition cards not included in LLRF budget• optional locking of LASER to 3 GHz source not included (may be required at later stage)
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2013 2014 2015 2016 2017 2018
Proton beam-line
Experimental area
Electron source and beam-line
Time-Scale
Edda Gschwendtner, CERN
Installation
Studies, design Fabrication Installation
Comm
issioning
data taking
Comm
issioning data taking
Time-scale for AWAKE as in the MTP
Modification, Civil Engineering and installation
Study, Design, Procurement, Component preparation
Study, Design, Procurement, Component preparation
• fellow for synchronization selected, will start in May 2015• until May 2015: evaluation of phase drifts to AWAKE on test fiber links
evaluate phase noise of 88 MHz in Munich, make prototype x34 for 3 GHz• priority from May 2015: fiber-optic link and then clock generation development • decision point if RF source at 3 GHz needed with LASER locked to it: not before summer 2015
Plan: