Minutes of the 65th MTE meeting held on Friday October 19th 2012

Present :

J. Borburgh, R. Brown, P. Demarest, S. Gilardoni, M. Giovannozzi, C. Hernalsteens, M. Hourican, E. Métral, S. Persichelli, B. Salvant.

Excused :

S. Mataguez, C. Pasquino.

 

1. Here are the main remarks from the impedance studies:

   • No particular issues are to be expected!

   • The beam screen is mandatory. Slots of 3mm time 10 mm (along the beam directions) should be foreseen. The ratio between holes and the whole beam screen surface should be 50%.

   • The beam screen should be in very good contact with the tank, but there is no need to have sliding contacts with the blade. Nevertheless, it will be important to minimise the gap below the beam screen whenever the blade is displaced towards the outside of the machine.

   • Ferrites should not be needed, but it is decided to provide supports just in case and an estimate of the surface needed is provided.

   • The impedance contribution is marginal, but detailed analysis of instabilities should be performed.

   • It is agreed that bench measurements will be performed before installing the device in the PS.

2. The recent details (i.e., ratio of holes and surface of beam screen and surface of ferrites) should be compared with parameters used for vacuum simulations (Action: TE-VCS).