Meeting on Linac4 - PSB BI Line, 05-Mai-2008

Present: Jan Borburgh; Christian Carli; Michel Chanel; Mohammad Eshraqi; Tony Fowler; Brennan Goddard; Michael Hourican; Volker Mertens; Wim Weterings

• WW reported on the Linac4 workpackage holders meeting of 22 April, showing slides of the status of project and some general communications, information about project documents and templates, EDMS and the EVM implementation. It was noted that a new work package (2.13 Beam intercepting devices, Y. Kadi AB/ATB) has been added to the LINAC4 work breakdown structure. BG proposed to invite Y.Kadi to one of our future meetings in order to discuss issues concerning the head-tail dump as well as the unstripped H^-dump.
   

• JB reported on the ongoing feasibility study concerning BI.BS magnet fall time. The field delay due to eddy currents in a vacuum chamber for a out of vacuum BS magnet were estimated by MC. As a base results of the out of vacuum BS magnet presented in the previous meeting were used. A magnet gap of 80 mm was assumed. The dB/dt was chosen 740 mT/ms, corresponding to a 1ms fall time of BI.BS3, giving a delay of 67 μs.
  A prototype magnet is being built to verify the calculated eddy current data.
   

• BB reported that the price enquiry for the BI.DIS ferrites is in ongoing.
   

• MH reported that the BI.DIS prototype coil manufacture has started.
   
• CC mentioned that, together with MC, quite some work was done on the conceptional aspects and on the geometry of the PSB H^- injection and a preliminary description of their ideas and conclusions has been written. BG replied that we should discuss this in a dedicated meeting in the context of what we have already worked on, and especially with respect to the aperture and bumper layout. However, being severely limited in resources for these studies, which has been signaled many times to our management, less time than planned has been devoted to this subject Nevertheless, the injection system design still remains AB/BT mandate.

WW