Minutes of the 72nd MTE meeting held on Thursday April 4th 2013

Present :

S. Burger, S. Damjanovic, P. Demarest, R. Fernandez Ortega, S. Gilardoni, M. Giovannozzi, M. Hourican, J.-M. Lacroix, S. Mataguez, J. Vollaire.

Excused :

D. Bodart, J. Borburgh, C. Hernalsteens.

 

1. The design of the shielding has been reviewed:

   • Most of the blocks are now special in order to optimised the layout.

   • The length of the shielding has been reduced to 980 mm.

   • Four blocks are marble blocks.

   • Next steps:

     • Check that the efficiency in terms of radioprotection is still acceptable. In particular, the thickness of the side wall reduced to 200 mm and the increased opening in the downstream part of the shielding should be checked in detail (Action: Sanja).

     • Check that the length can be increased to 1000 mm without any impact on magnet access and installation (Action: Raul).

     • Check that the main magnet bus bars are accessible and that an additional overhang of 100 mm/200 mm would be acceptable too (Action: Raul).

     • Check that the transport endorses the proposed layout (Action: Raul).

2. Other points: 

   • Jean-Michel checked the overall integration:

     • The concrete block supporting the dummy septum should have special dimensions and the alignment screws are in contact with the downstream part of the shielding (Action: Mike).

   • The overall installation activity will be provided to Simon in order to be included in the LS1 general planning (Action: Mike).

   • Massimo reported that additional checks performed by S. Persichelli and B. Salvant showed that the line at 100 MHz recently observed in the simulations of the dummy septum impedance was also presented in the original design. Two possible solutions are at hand:

     • Introducing sliding contacts between the table supporting the dummy septum blade and the beam screen.

     • Introducing ferrites.

   • Mike comments that both are feasible and should not pose any problem. In this case the first solution would be the preferred option (Action: Mike, Serena, Benoit).

   • The BTV construction is progressing well and no issues are foreseen, so far. It is important to verify that the integration of the BTV is compatible with the new layout of the shielding (Action: Stephane).