Meeting on Linac4 - PSB BI Line, 23-November-2009

Present:  L. Sermues, M. Scholz, C. Carli, M. Channel, R. Noulibos, M. Channel, B, Balhan,
                M, Hourican, W.Weterings.

Excused: J. Borburgh, R. Chamizo.

• Status H-/0 internal Dump studies (RC) - postponed
• Status BI.SMV magnet calculations (BB)
  Bruno presented the current status of the BI.SMV magnet 3D analysis. As input was used the 2D magnet design made by Jan and the latest layout input. The study is made with a segmented yoke.  A prototype of a curved yoke has been made but proper construction and clamping of a curved coil might be problematic. The current design allows a beam acceptance of 35mm. For further details, see slides.
• Status BI.DIS magnet construction (MH)
  Mike presented the Status of BI.DIS Magnet Construction. One complete magnet system (5 BI.DIS) has been assembled and inserted in the vacuum tank. A special tooling was developed to guide the magnets in the tank by removable rails. A 30kV feedthrough was developed and successfully tested and the resulting design will be used for the BI.DIS, although the current PFN design only requires ~5kV due to the fact that the 25Ω impedance could be reduced to 5Ω. Finalizing the feedthrough design with multicontact connexions still remains to be done.
• BS magnets with ceramic vacuum chambers (WW)
  Wim presented possible vacuum variants for the BS magnets. The magnets could be assembled inside vacuum tanks. This is feasible, but large bulky tanks are required to house the magnets. Furthermore, bake-out will be required and intervention will be difficult and time-consuming, specially for intervention on one of the lower ring magnets, when both tanks will need to be removed. The use of undulated Inconel chambers has also been studied, but the influence of the eddy current effects and resulting optics perturbations have not yet been fully understood. (see also related meeting). The possibility of using ceramic chambers was also studied, this option would be feasible, but aperture restrictions for BS1 due to the increased thickness of the chamber still need to be resolved. Furthermore, the procurement and price of ceramic chambers could be an issue.
• AOB

WW