PARTICIPATION IN THE DESIGN AND R&D ACTIVITIES FOR A FUTURE LINEAR COLLIDER:

PARTICIPATION IN THE DESIGN AND R&D ACTIVITIES FOR A FUTURE LINEAR COLLIDER: Accelerator and Detector aspects A. Faus-Golfe IFIC - Valencia FPA2005-02935

Outline • Scientific project • Main goals • Accelerator Physics • Machine Detector Interface • Detectors • Personnel & Task See Carlos Lacasta’s Talk A.Faus-Golfe

Scientific project: Main Goals Our project pretends to initiate/consolidate the participation of the IFIC to the ILC effort in both aspects: Detector Machine Machine Detector Interface A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects The IFIC participation has already started with: • A feasibility study of a non-linear collimation system for CLIC in 2002 in collaboration with CERN. A doctoral thesis started in the beginning of 2004: ”Design and Performance Evaluation of a Nonlinear Collimation System for CLIC and LHC”(CERN doctoral students program) • Participation in the European Project CARE-ELAN in the beginning of 2004 • Participation in the specific design study EUROTeV, approved in late 2004 A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects Feasibility of a non-linear collimation system for • Design Optics • Non-linear impact on the BDS • Cleaning efficiency • Spoiler survival • Application to other collimation systems (LHC, ILC) A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects • Ongoing work: See A. Faus-Golfe talk in Nanobeam 05 and CLIC BDS Day • Design Optics • Optics with bends between the skews shows better performance from the collimation efficiency point of view but there is no complete cancellation of the geometric aberration and the luminosity is very poor • New optics with no bends between the skews to avoid the luminosity degradation keeping good collimation efficiency • [T.Asaka, A.Faus-Golfe, J.Resta López, D. Schulte and F. Zimmermann “Alternatives Design for Collimation system” To be published ] A.Faus-Golfe

Sk Sk Sp Scientific Project: Main Goals Accelerator aspects 1st optics solution: No bends between the skews A.Faus-Golfe

Sk Sk Sp Scientific Project: Main Goals Accelerator aspects 2nd optics solution: Bends between the skews A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects Ongoing work: • Collimation survival • install perfect spoiler & perform simulations with MAD and PLACET [T.Asaka, J. Resta López “Characterization and Performance of the CLIC BDS with MAD, SAD and PLACET” ELAN (2005)] • consider real spoiler with scattering, install absorbers, optimize absorber locations, run BDSIM or SIXTRACK or MARS simulations (linear system already contains spoilers and absorbers) [Drozhdin et al, “Comparison of the TESLA, NLC and Beam Collimation system performance” CLIC Note 555 (2003)] • Chromatic properties & Luminosity performance & Beam size at the spoiler vs sextupole strength & average momentun off-set See J. Resta López talk in CLIC BDS Day A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects Entrance: IP: Importance of the benchmarking of codes Guinea-Pig Multiparticle tracking Optics lattice Beam-beam interaction transport performance MAD Placet SAD … Lie A.Faus-Golfe

Scientific Project: Main Goals Accelerator aspects A.Faus-Golfe

Scientific Project: Main Goals Machine Detector Interface Design study of the disrupted and energy degraded beam after the IP. Impact in the tracking performance. Simulations based on realistic beam conditions including the halo: • identify and estimate losses in the spent beam transport line • study of installation of relevant post-IP beam diagnostic(luminosity, energy and energy spread and polarisation monitors) A doctoral thesis started in the beginning of 2005: ”Design and Performance Evaluation of the MDI system for the ILC”(EU doctoral students program) Collaboration: A.Faus-Golfe

Scientific Project: Main Goals Machine Detector Interface • Ongoing work: • Beam parameters for e-e- mode operation at the ILC • e-e- shows sharper deflection curves (feedback slower) and faster luminosity drop with offset (more stringent constraints on residual offset) that makes feedback very difficult • Alternative beam parameters: increase of sy(steepness can be reduced at the expense of a factor 2 in L) and decrease sx(smoother deflection curve and partly recovered L at the expense of a factor 2 in db) • [C.Alabau, P.Bambade and A.Faus-Golfe, “Beam-Beam parameters for e-e- mode operation at ILC” To be published ] See C. Alabau talk in ECFA Study on Physics and detectors for ILC A.Faus-Golfe

Scientific Project: Main Goals Machine Detector Interface Increasing sy e-e- Deflection Angles (σx=σxo) e-e- Luminosity (σx=σxo) e-e- Beamstrahlung Loss (σx=σxo) - better deflection curve - lower luminosity (factor 2) - similar beamstrahlung energy loss A.Faus-Golfe

Scientific Project: Main Goals Machine Detector Interface Decreasing sx e-e- Deflection Angles (σx=0.5σxo) e-e- Luminosity (σx=0.5σxo) e-e- Beamstrahlung Loss (σx=0.5σxo) - better deflection curve / luminosity - greater beamstrahlung energy loss problems for beam extraction (maximum ~5-6%) problems for physics? A.Faus-Golfe

Personnel & Tasks TASK PERSONNEL Feasibility of a non-linear collimation system A. Faus-Golfe Particle tracking along BDSJ. Resta Lopez Machine Detector Interface A. Faus-Golfe J. Fuster Verdú C. Alabau Pons R&D on Si DetectorsC. Lacasta Llacer Participation on the design of tracking system J. Fuster Verdú Post-doc I. Carbonell Mechanical Eng. A.Faus-Golfe

Other related Project: Accelerator aspects Further work: Beam Instrumentation for TBL at CTF3/CLEX: See F.Toral and Y. Kubyshin talks • Mechanics A.Faus-Golfe

PARTICIPATION IN THE DESIGN AND R&D ACTIVITIES FOR A FUTURE LINEAR COLLIDER: