Minutes of the 61st MTE meeting held on Thursday August 30th 2012

Present :

J. Borburgh, R. Brown, S. Damjanovic, M. Giovannozzi, C. Hernalsteens, S Mataguez, C. Pasquino.

Excused :

N. Baddams, R. Fernandez Ortega, S. Gilardoni, M. Hourican

 

1. Access to the PS tunnel could be granted during the next technical stop (18-19 September): this might be a very good opportunity to have a look at the details of SS15.

2. It will be important to have the concrete shielding finalised in order to define whether all blocks are available or some of them need to be built (Action: TE-ABT).

3. The vacuum situation after the installation of the dummy septum is being reviewed and a presentation is scheduled for the next meeting (Action: TE-VSC).

4. Evaluation of the impedance of the septum should be finalised. In particular, it should be assessed whether the proposed screen is really needed (Action: ABP).

5. The cabling work needed for the installation of the dummy septum is officially including in the planning of LS1 activities.

6. Ray mentions that in the current schedule of the PS activities, the installation of the dummy septum is foreseen for January 2014. He also mentions that that the dummy septum should be installed only after MMU14 is put back in its position (MMU14 has still old coils and will receive new PFWs during LS1, while MMU15 has been already refurbished ).

7. The possible addition of instrumentation has been discussed with R. Veness (BI). Mike will continue discussions to have conclusions by the next meeting (Action: TE-ABT).

8. The presentation by Cédric represents the first iteration on the determination of the efficiency of the dummy septum solution. The whole chain of tools (Fluka and PTC) seems to work. The figures presented will be carefully cross-checked and the new results will be presented in the coming meetings. The phase advance between SS15 and SS16 introduces an unavoidable inefficiency in the shadowing process. Tracking of the particles downstream of the septum 16 will be performed in order to assess whether hot spots are to be expected.

9. Concerning the cross section of the dummy septum blade, it seems there is no need to have a shape different from a plain rectangle, but some checks will be done with the numerical simulations, e.g., by taking into account the actual cross section of the magnetic septum blade in the Fluka simulations.