Minutes of the 54th MTE meeting held on Thursday March 15th 2012

Present :

N. Baddams, S. Damjanovic, S. Gilardoni, M. Giovannnozzi

Excused :

J. Borburgh, M. Hourican

1. A complete analysis of the energy deposition is available and this should serve a s a basis for a detailed estimate of temperature increase in order to define the cooling required for the septum blade (Action: ABT).

2. The blade material might be selected also based on impedance considerations.

3. The energy deposition in the vacuum chamber of MMU15 should be considered as input to decide whether cooling is needed (Action: MG to contact D. Bodart).

4. The longitudinal dimension of the dummy septum tank should be decided, as this has an impact on the overall SS15 layout (dimensions of the vacuum chamber section that should connect the tank to MMU14 and 15) as well on the optimisation of the shielding (Action: ABT).

5. The study of the shielding optimisation has been completed: radiation outside is not too sensitive to transverse dimensions. The shielding height, however, is a critical parameter for radiation level outside the tunnel. A height of 2.10 m is the optimal value. The longitudinal position could provide an additional dose reduction of about 30% and this is worth the optimisation efforts.

6. The transverse dimensions are such that the shielding would interfere with the bus-bars on the inside of the tunnel. It is therefore proposed to change the layout of the shielding. A simple table will be supporting the shielding (very much like the situation in SS47 and 48 where the internal dumps are installed). Hence, the bus burs will not be blocked by the shielding. The dummy septum will still be put on a concrete block that would be located on the metallic table. The review of the design should be co-ordinated by ABT with civil engineering to confirm choices and drawing office to define the details of the table (Action: ABT, GS-SE, EN-MEF).

7. Tracking of particles should be considered (Action: RP and ABP).