Commissioning and utilisation of erlp
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Commissioning and Utilisation of ERLP. David Holder ASTeC, Daresbury Laboratory. Content. Introduction to ERLP; ASTeC’s contribution to ERLP; ASTeC’s plans for ERLP exploitation. ERLP. E nergy R ecovery Linac P rototype Demonstrating skills and technologies for 4GLS:

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Commissioning and Utilisation of ERLP

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Commissioning and Utilisation of ERLP

David Holder

ASTeC, Daresbury Laboratory


  • Introduction to ERLP;

  • ASTeC’s contribution to ERLP;

  • ASTeC’s plans for ERLP exploitation.


  • Energy Recovery Linac Prototype

  • Demonstrating skills and technologies for 4GLS:

    • Operation of photo injector electron gun;

    • Operation of superconducting electron linac;

    • Energy recovery from a FEL-disrupted beam;

    • Synchronisation of gun and FEL output.


  • Nominal Gun Energy350 keV

  • Injector Energy8.35 MeV

  • Circulating Beam Energy35 MeV

  • Linac RF Frequency1.3 GHz

  • Bunch Repetition Rate81.25 MHz

  • Max Bunch Charge80 pC

  • Max Average Current13 µA

Machine Status

  • Laser system nearly ready;

  • IOTs under test on site;

  • Gun ceramic – major source of delay – now expected March 2006 (~1 year late);

  • Accelerator modules arriving April/June 2005 (~6 months late);

  • 4 K commissioning Feb 06.

Gun Commissioning April to June

  • Dedicated diagnostic beamline designed by ASTeC to fully characterise the gun and benchmark the codes used for design; e.g. predicted effect of spacecharge:




Gun Commissioning April to June

Comparison and benchmarking of beam dynamics code for injectors - ASTRA and GPT

Photoinjector Laser - Collaboration with CLF

Machine Commissioning 1

  • Complete machine ready September 06;

  • Aim to demonstrate energy recovery with wiggler-disrupted beam early 2007;

  • Very challenging technical and timescale issues;

  • ASTeC has overall responsibility for successful planning and execution.

Machine Commissioning 2

Confirming suitability of TBA arc design chosen for 4GLS:




4-dipole chicane

Machine Commissioning 3

Confirming 4 dipole chicane bunch compression scheme:

Machine Commissioning 4

before FEL

  • Modeling of FEL interaction using in Genesis 1.3;

  • Major tool used for design of 4GLS sources;

  • Commissioning measurements will confirm validity of code and other calculations.

after FEL

Machine Commissioning 5



Measurements to verify start to end simulations results



First case of complete S2E modelling of an ERL with a FEL and energy recovery

Machine Commissioning 6

Operation of 2 K cryosystem - vital to operation of 4GLS

ERLP Exploitation 1

As an R&D exercise NOT as a user facility.

  • Accelerator test bed:

    • advanced accelerator operation, diagnostics, photocathode guns, SCRF, electron beam/laser synchronisation;

  • science

    • THz

    • X-ray (NWSF grant £2.9M, 3 years)

    • combined sources/synchronisation.

ERLP Exploitation 2

Compton backscattering X-ray source

Time resolved X-ray diffraction studies aimed at probing the mechanisms of shock compression of matter on sub picosecond (ps) timescales.

THz beamline and a tissue culture facility.

To use the ultrahigh intensity, broadband THz radiation for the study of biological systems.

The end

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