Minutes of the 62nd MTE meeting held on Thursday September 13th 2012

Present :

P. Chiggiato, S. Damjanovic, S. Gilardoni, M. Giovannozzi, C. Hernalsteens, M. Hourican , A. Lachaize, C. Pasquino.

Excused :

N. Baddams, J. Borburgh, R. Brown

 

1. 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).

2. The situation of the impedance computation is being reviewed and Massimo will verify for the possibility of having a presentation in the near future (Action: ABP).

3. Concerning the vacuum in the sector 20, the studies showed that strictly speaking it is not needed any additional pumping. The presentation triggered the following points that will be discussed at the next meeting:

   • The installation of a blind flange on the top of the vacuum vessel for installation of an ion pump in case of need is excluded. Indeed, it would prevent to align the neighbouring main magnets and it would need to be dismantled each time a realignment is needed.

   • A different solution could be to study whether additional pumping could be added to MM14. Another alternative would be to add a pumping port beneath the vacuum chamber next to the dummy septum.

   • In case of heating due to trapped modes ferrites might be needed. This option would require installing only appropriate ferrites, with a proper treatment. Vacuum simulations to take into account increased desorption will be carried out.

4. A meeting to discuss the possibility to install beam monitoring device has been organised.

5. The estimate of the losses on the septum 16 has been re-checked by Cédric finding an agreement with old estimates (of 1%). Preliminary results show that 0.8% will be lost on the dummy septum, while 0.2% should reach the extraction septum. This is roughly the same level of losses that we have now on SMH16 for the CT.

6. The cabling work required for the dummy septum has been confirmed in the official planning of LS1 activities.