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L inear C ollider – A ccelerator and B eam D elivery

L inear C ollider – A ccelerator and B eam D elivery. Roger Barlow PPARC: UCL 2nd October 2002. The Challenges. Accelerator Science needs more brain power.

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L inear C ollider – A ccelerator and B eam D elivery

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  1. Linear Collider –Accelerator and Beam Delivery Roger Barlow PPARC: UCL 2nd October 2002

  2. The Challenges Accelerator Science needs more brain power “There are two excellent reasons for the stakeholders in these fields to take a more active role in this part of instrumentation development. • The control of increasing facility costs needs intellectual input. • The need for new capabilities in pushing forward the frontiers in the various sciences demands involvement by those who best understand these capabilities.” • Maury Tigner, Cern Courier May 2002 LC-ABD PPARC SoI

  3. The components LC-ABD Forum Umbrella organisation Basic Technology bid Laserwire FONT LiCAS Computation Coherent Radiation Electro-Optic Sensing LC-ABD PPARC SoI

  4. FONT Keep beams colliding – feedback applied to the other beam. Essential to get luminosity – beam bunches nm across UK leading in design of vital LC component Tests at SLAC Bid submitted Feedback On Nanosecond Timescales LC-ABD PPARC SoI

  5. LiCAS • Phase I • Measure collider component positions during installation. (Current technology cannot do this.) • Techniques: • FSI (frequency Scanning ) with Telecommunications lasers and fibre amplifiers • Laser Straightness monitors • Spec: 200 micron 3D absolute position over 600 m segments • Close collaboration with DESY (MOU) for test and use in TESLA FEL. Technique applicable to all LCs • Bid submitted to PPRP (£70K) Phase II Online monitoring of collider component positions Techniques: Phase I + Michelson interferometry Spec: Phase I with differential measurements  nm and absolute measurement to 100 m over 600 m LC-ABD PPARC SoI

  6. Bunch Profile monitor – needs to be accurate and non-destructive and fast and reliable Hardware development. Tests at CERN & DESY Geant4 simulation in accelerator codes Investigate feasibilty of Shintake beam size monitor – uses laser interference pattern Developments have had support Working with RAL laser group Bid for continuation submitted Laserwire/Simulation LC-ABD PPARC SoI

  7. Computation • Many questions – new computing techniques and facilities (Grids, Beowulf 2) available for exploitation. Needed as simulation becomes complicated (non-linear, many-body) • Liverpool and Manchester+ASTeC • Work started – PhD students • Want to build infrastructure of accelerator science: courses etc. • Bid submitted LC-ABD PPARC SoI

  8. Beam profile studies (1) • Bunch passing periodic structure  Smith Purcell Radiation (far I-R) • Coherent enhancement forz • Tested at Frascati with 14ps bunches • Bid in preparation £245K over 4 years George Doucas (Oxford) LC-ABD PPARC SoI

  9. Beam profile studies (2) Electro-optic sensors: Birefringent Crystal affected by beam pulse, sampled by laser Sensitive at subpicosecond level Tested at FELIX Free Electron Laser Bid in preparation £600K Allan Gillespie (Abertay) LC-ABD PPARC SoI

  10. Conclusion Accelerator science is a priority • Needs university involvement in R&D as well as major commitments to CLRC machine builders • LC-ABD groups committing time, people, effort • PPARC support is and will be needed LC-ABD PPARC SoI

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