Commissioning and Utilisation of ERLP

David HolderASTeC, Daresbury Laboratory

• Introduction to ERLP;Introduction to ERLP;

• ASTeC’s contribution to ERLP;ASTeC’s contribution to ERLP;

• ASTeC’s plans for ERLP ASTeC’s plans for ERLP exploitation.exploitation.

Content

ERLP• 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.

Parameters

• Nominal Gun Energy 350

keV

• Injector Energy 8.35 MeV

• Circulating Beam Energy 35 MeV

• Linac RF Frequency 1.3 GHz

• Bunch Repetition Rate 81.25 MHz

• Max Bunch Charge 80 pC

• Max Average Current 13 µA

• 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.

Machine Status

• 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

0 0.5 1 1.5 2 2.50

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200 G205 G210 G215 G

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

buncher solenoid booster

Gun Commissioning April to June

Photoinjector Laser - Collaboration with CLF

• 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 1

Confirming suitability of TBA arc design chosen for 4GLS:

Machine Commissioning 2

Confirming 4 dipole chicane bunch compression scheme:

Machine Commissioning 3

4-dipole chicane4-dipole chicane

LBLB

LDLD

• 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.

Machine Commissioning 4

before FEL

after FEL

1

23

4

Machine Commissioning 5Measurements

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

• 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.

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

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.

ERLP Exploitation 2

The end