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G J Hirst
CLF
4GLS Schematic
CW gun (4 MeV)
600 MeV
750 MeV
4 MeV dump (~400kW)
1 GeV dump (~1 kW)
BC 2
XUV-FEL
Spontaneoussource
XUV experiments
Seed laserVisible
XUV-FELgun
BC 1
3rd harm.
THzsource
Photon diagnostics & filtering
High average current
VUV-FEL
Spontaneous sources and beam optics/compression
High bunch charge
200 MeV
Beam transport & compression
Bending magnet source
550 MeV - Linac 1
Matching &diagnostics
200 MeV
IR-FEL
50 MeV
50 MeV
G J Hirst
CLF
4GLS Time Structures
• XUV FEL: ~1 kHz, using high-charge bunches substituted into the low-charge train
• “XUV” spontaneous: From same bunches as XUV FEL
• VUV FEL: ~5 MHz cavity round-trip rate
• Undulators & BMs: Up to the accelerator RF rate(0.7-1.5 GHz - TBD)
• IR FEL: ~5 MHz cavity round-trip rate
• Conventional lasers: Arbitrary
G J Hirst
CLF
4GLS Synchronisation
User synchronisation requests (from 53 experiments*):
Conventional VUV FELUndulators
lasers
IR FEL 1 10 4
VUV FEL 4 7
XUV FEL 2 2 1
Undulators/BMs 2(It is suspected that conventional laser requirements have been underestimated)*See the 4GLS Science Case at www.4gls.ac.uk/Documents/EPSRC-Dec2001/Science_Case.pdf
G J Hirst
CLF
4GLS Synchronisation
User synchronisation requests (from 53 experiments*):
Conventional VUV FELUndulators
lasers
IR FEL 1 10 4
VUV FEL 4 7
XUV FEL 2 + seeding 2 1
Undulators/BMs 2(It is suspected that conventional laser requirements have been underestimated)*See the 4GLS Science Case at www.4gls.ac.uk/Documents/EPSRC-Dec2001/Science_Case.pdf
G J Hirst
CLF
4GLS/DS3 Programme
• Machine stability:
Can a machine like 4GLS be designed and built with enough stability for a distributed RF system to be a good timing reference everywhere ?
• Local sensors:
If the machine is not stable enough then local sensors will be needed. Can these be sufficiently accurate and cheap to be fielded in many locations ?
• Complex time structures:
Can signal processing systems be developed to allow feedback jitter correction when the pulse time structure is irregular ?
G J Hirst
CLF
ERLP TestsERLP is a 35 MeV ERL with 1.3 GHz SCRF and an 81.25 MHz, 6mA photoinjector
Bunch compression to 600 fs is planned
Photoinjector laser locked to RF to <400 fs
Complex time structures will be trialled
Separate kHz/mJ TiS laser for EO measurements
Local pickup sensors will be tested
G J Hirst
CLF
4GLS Project Plan
ERLP Electron gun completeAccelerator assembledCommissioning & testing
4GLSConceptual Design ReportTechnical Design ReportBid submittedBid decision
EUROFEL DS3Local timing sensor reportMachine stability reportComplex time structure report
2005 2006 2007Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4