1. WP: Parameters and design. Plans from IFIC, Valencia Javier Resta López on behalf of the IFIC accelerator group (http://gap.ific.uv.es) IFIC (CSIC-UV), Valencia, Spain CLIC WP meeting 3rd November 2011

2. BDS activities Our field of interest: CLIC post-linac collimation system (in BPH-BDS WP). What has been done so far? – Optics design of collimation system for 3 TeV CM – Specification of collimator parameters (for spoilers and absorbers) – Preliminary thermo-mechanical simulation studies for Be based spoiler model and Ti-alloy based absorber model – Preliminary collimator wakefield studies – Optical optimisation of betatron collimation system – Development of simulation codes for collimation studies: I. Agapov et al., Phys.Rev.ST Accel.Beams 12 (2009) 081001 – Present status of the CLIC collimation system: J. Resta-Lopez et al., arXiv:1104.2426v1 [physics.acc-ph], and arXiv:1104.2431v1 [physics.acc-ph], 13-April-2011

3. BDS activities Post-linac collimation system What is next? – Improve collimation system design – Detailed design of collimators (material, geometry). Hardware specifications (engineering design for the CLIC TDR) – Performance studies: Determine collimator wakefield effects (collaboration with BPH-SIM). Possible experimental tests Complete tracking study using a realistic model of the halo and taking into account secondary particle emission + wakefields (collaboration with BPH-SIM) Realistic simulations for the thermo-mechanical analysis of the energy collimators, considering results from recent failure mode studies (collaboration with BPH-MP) – Explore other collimation alternatives: Other materials (e.g. SiC foam for the spoilers), materials with special electromagnetic properties Non-linear collimation optics (design optimisation) Crystal collimation

4. BDS activities Participation in possible experimental program (connection with BTS-001): – Measurement of collimator wakefields in a regime as close as possible to CLIC regime: proposal to be presented next year for test at SLAC ESTB (details to be discussed during a kickoff meeting) – Collaborators: J. Barranco, A. Latina, G. Rumolo, D. Schulte, R. Tomas, CERN H. Day, R. M. Jones, Cockroft Institute, University of Manchester, UK J. L. Fernandez-Hernando, S. Jamison, ASTeC, UK A. Seryi, JAI, University of Oxford, UK J. Smith, Lancaster University and Tech-X UK Ltd, UK IFIC accelerator group, Valencia, Spain Strong collaboration with SLAC staff members will be essential for the preparation, commissioning and execution of this experiment

5. BDS activities For the collimator wakefield experiment, the IFIC accelerator group could contribute to the following tasks: – Analytical calculation of wakefield kick factors – Simulation of wakefield effects – Design and construction of new collimator prototypes, following the design specifications for CLIC collimators – Commissioning of experimental setup – Development of necessary software for data acquisition and posterior analysis – Participation in the requested experimental shifts – Data analysis and comparison with results from theory and simulations

6. Additional activities we could also contribute to BPH-SIM: Integrated modelling and performance – Task 3: Static tolerances, beam-based alignment and tuning BPH-RTML: Ring-To-Main-Linac – Task 1:Beam line design: Design missing beam lines and provide matching sections Design pre-linac collimation system (synergy with post-linac collimation studies in BPH-BDS WP)