2th EuCard Col/Mat WP Meeting Phase II Collimators: Project Status and Recent Progress 2th EuCard Col/Mat WP Meeting 22th March 2010 A. Bertarelli on behalf of the Phase II Collimation Design team

Outline Present design of Collimator Jaws Numerical Simulations BPM prototype installation New Materials R&D Future outlook Conclusions 2 2

Fine adjustment system Collimator Jaw Design Jaw with 3 Segments on 2 intermediate adjustable support. Modular design allowing choice of alternative materials Fine adjustment system Mo Back-Stiffener Segmented jaw: each piece independently supported on the back stiffener. Enhanced geometrical stability 3 3 3

Collimator Jaw Design Jaw with 3 Segments on 2 intermediate adjustable support. Modular design allowing choice of alternative materials Each sector independently cooled by a brazed cooler Jaw Jaw - Stiffener Machined cooling circuit with brazed covers Back - Stiffener 4 4 4

Numerical simulations FLUKA model of complete Phase II collimator Thermal deflection (Steady-state 1 hr t) Total deposited power (@0.8 e11 p/s) 20.6 kW Plot of Fluka processed data at z=0.28m (Wmax=92 W/cm3)

Numerical simulations Preliminary simulations of direct 7 TeV beam impact (200 ns): SiC gives promising results (no melting as opposed to Glidcop jaw). Simulations with hydrodynamic codes + dynamic characterization of the materials + HiRadMat tests required. Glidcop Jaw Temperature distribution Max Pressure increase of cooling water: ~60bar SiC Jaw Maximum principal stress distribution ~25bar 5th D.o.F. motor allows to move all the vacuum tank by ± 10mm. Collimators should withstand up to 5 accidents. Melted region (grey) Affected region (grey): Thermal stresses exceeding tensile strength 6 6 6

BPM functional prototype Complete prototype assembled and installed in SPS. First electrical tests give promising results 7 7

New Materials R&D Intensive new Materials Characterization in collaboration with several institutes (AIT, EPFL, GSI, RRC-KI, PoliTo) Cu-CD Liquid Infiltration (EPFL: Al-CD and Ag-CD as possible alternatives) Hot Pressing (AIT) SiC Sintered vs. CVD (suitable suppliers under evaluation) GlidCop Molybdenum Copper Diamond Composite Silicon Carbide

New Materials R&D Ongoing Activities Brazing Coatings Tests already performed: Cu/SiC, CuCD/SiC, CuCD/Cu… Simulation of brazing processes ongoing Coatings Optimization of coatings for improved Cu/Glidcop brazing (CERN) Materials Characterization Thermo-physical Properties (CERN, AIT, EPFL) Dynamic Characterization and Shock-wave Simulations (PoliTo) Materials Irradiation (KI, GSI, AIT) Work-plan established on Meeting 26/02/2010

Present and Future Outlook Manufacturing of Metal-CD samples Large Cu-CD tiles (to be) produced by AIT Optimization of CD content (AIT / EPFL) Irradiation studies Samples to be provided by AIT Tests carried out by KI and GSI (results by Apr. ‘11) Material characterization Material candidates fully characterized (thermo-physical and mechanical properties). AIT, PoliTo, CERN, EPFL Simulations In-depth Hydrodynamic FEM simulations (PoliTo; GSI) Prototyping (CERN) 10 10

CONCLUSIONS Design of collimator jaws very advanced. BPM prototype manufactured, installed, under test. New full Phase II prototype under manufacturing. Material R&D program in progress, but lot of work still ahead of us. Main axes are: Development of Metal-CD (Cu-CD, Ag-CD, Mo-CD) Assemblying different materials (SiC, SiC coating, brazing) Irradiation tests and simulations FEM and hydrodynamic simulations. Tracking simulations 11 11