1. 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

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

3. 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

4. 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

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

6. 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

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

8. 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

9. 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

10. 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

11. 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