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)

8

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: