LCABD Linear Collider Accelerator and Beam Delivery Roger
LC-ABD Linear Collider – Accelerator and Beam Delivery Roger Barlow PPARC: UCL 2 nd October 2002 Ba. Bar: an IT perspective Slide /12
LC-ABD 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 Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 2
LC-ABD The components LC-ABD FONT Li. CAS Coherent Radiation Roger Barlow 2 Oct 2002 Forum Laserwire Computation Electro-Optic Sensing LC-ABD PPARC So. I Umbrella organisation Basic Technology bid 3
LC-ABD FONT Feedback On Nanosecond Timescales 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 Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 4
LC-ABD Li. CAS 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 3 D 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 ( £ 70 K) Roger Barlow 2 Oct 2002 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 So. I 5
LC-ABD Laserwire/Simulation Bunch Profile monitor – needs to be accurate and non-destructive and fast and reliable • Hardware development. Tests at CERN & DESY • Geant 4 simulation in accelerator codes • Investigate feasibilty of Shintake beam size monitor – uses laser interference pattern Roger Barlow 2 Oct 2002 • Developments have had support • Working with RAL laser group • Bid for continuation submitted LC-ABD PPARC So. I 6
LC-ABD Computation • Many questions – new computing techniques and facilities (Grids, Beowulf 2) available for exploitation. Needed as simulation becomes complicated (non-linear, manybody) • Liverpool and Manchester+ASTe. C • Work started – Ph. D students • Want to build infrastructure of accelerator science: courses etc. • Bid submitted Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 7
LC-ABD Beam profile studies (1) • Bunch passing periodic structure Smith Purcell Radiation (far IR) • Coherent enhancement for z • Tested at Frascati with 14 ps bunches • Bid in preparation £ 245 K over 4 years George Doucas (Oxford) Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 8
LC-ABD 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 £ 600 K Allan Gillespie (Abertay) Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 9
LC-ABD 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 Roger Barlow 2 Oct 2002 LC-ABD PPARC So. I 10
- Slides: 10