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Synchronisation Activities for 4GLS Supported by EUROFEL DS3

Synchronisation Activities for 4GLS Supported by EUROFEL DS3 G J Hirst CCLRC Central Laser Facility. IR-FEL. 50 MeV. 4GLS Schematic. 4 MeV dump (~400kW). CW gun (4 MeV). 50 MeV. Beam transport & compression. BC 1. 600 MeV. 3 rd harm. 200 MeV. 550 MeV - Linac 1. 750 MeV.

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Synchronisation Activities for 4GLS Supported by EUROFEL DS3

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  1. Synchronisation Activities for 4GLS Supported by EUROFEL DS3 G J HirstCCLRC Central Laser Facility

  2. IR-FEL 50 MeV 4GLS Schematic 4 MeV dump (~400kW) CW gun (4 MeV) 50 MeV Beam transport & compression BC 1 600 MeV 3rd harm. 200 MeV 550 MeV - Linac 1 750 MeV XUV-FELgun Photon diagnostics & filtering Matching & diagnostics XUV experiments Spontaneous source High bunch charge XUV-FEL 200 MeV BC 2 1 GeV dump (~1 kW) Visible Seed laser High average current VUV-FEL Spontaneous sources and beam optics/compression Bending magnet source THz source

  3. 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

  4. 4GLS Synchronisation Conventional VUV FEL Undulators lasers IR FEL 1 10 4 VUV FEL 4 7 XUV FEL 2 2 1 Undulators/BMs 2 User synchronisation requests (from 53 experiments*): (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

  5. 4GLS Synchronisation Conventional VUV FEL Undulators lasers IR FEL 1 10 4 VUV FEL 4 7 XUV FEL 2 + seeding 2 1 Undulators/BMs 2 User synchronisation requests (from 53 experiments*): (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

  6. 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 ?

  7. ERLP Tests ERLP 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 Separate kHz/mJ TiS laser for EO measurements Local pickup sensors will be tested Complex time structures will be trialled

  8. 4GLS Project Plan 2005 2006 2007 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 ERLP Electron gun complete Accelerator assembled Commissioning & testing 4GLS Conceptual Design Report Technical Design Report Bid submitted Bid decision EUROFEL DS3 Local timing sensor report Machine stability report Complex time structure report

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