Meeting on Linac4 - PSB BI Line, 22-February-2010

Present:  L. Sermeus, C. Bracco,  F. Roncarolo, U. Raich, B. Goddard, M. Hourican, J. Borburgh, R. Chamizo.

• Follow up previous meetings
  It was mentioned that the specification for the H0/H- injection beam dump is being prepared to be send out for approval. This will be done simultaneously with the specification for the measurement of the beam current at the PSB H0/H- injection beam dump, to be discussed during this meeting.
• Measurement of beam current at the PSB H0/H- injection beam Dump
  BG presented a proposal for the specification for measurement of the beam current at the H0/H1 dump. Since electrical insulation of dump block seems to be difficult due to dump heating issue, thermal contact, etc. the use of a ‘Faraday cup’ principle to measure the stripped electrons is proposed. The performance specification and design requirements were discussed and will be documented in an engineering specification, which will circulate for comments shortly.
• BS chicane magnet options; discussion of technical feasibility of 0.5 ms and 5ms decay times
  BB presented further simulations results of the dump impact on the BS4 field for fast decay under vacuum magnets and slow decay outside vacuum magnet. The influence of a single, not segmented, graphite block was presented and the results were ~4 times higher (5*10^{4- T} not segmented, 1.6*^10-4 T segmented). It was proposed to study the influence of the variation of the conductivity of graphite and the calculate the values of the multi-poles in the magnetic field.
• Preliminary results on H⁰ Dump simulations
  RC presented preliminary results of the H0 dump simulations. The thermal simulations showed a temperature increase of the dump block of ~30 degrees in case a water-cooled heat sink is attached to the end of the dump block. The feasibility of such a design was discussed and it was mentioned that the required vacuum in that region shall be in the (dynamic) range of 10^-8.
• AOB
  It was proposed to discuss the specification of the BTV screen in the stripping foil region during next meeting.

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