BI-Linac4 meeting of Wednesday 11th October 2006 Minutes by M. Pasini and K. Hanke

Present: M. Pasini, K. Hanke, U. Raich, L. Soby, C. Dutriat, E. Bravin, G. Tranquille Excused: F. Lenardon, J.J.Gras

Agenda: 1. Finalize design, time-lines and cost estimate for the various devices in Linac4. [all equipment specialists] 2. LEBT diagnostics status [Raich] 3. BSHM test [Hanke]


1. K. Hanke and M. Pasini had distributed before the meeting an excel table to be filled in order to review the cost estimate and the man-power necessary for the Linac4 project.

No part of the table has been filled in so far. E. Bravin and U. Raich answered that it was not possible to have a break-down of the costs because it would need to spend some time looking into the design of the several elements. Due to the lack of personnel this study cannot be done in the next 18 months. In fact the previous estimate was done based on the present available equipment. For the Linac4 project the limited longitudinal space available requires some development which cannot be provided at this moment.

K. Hanke asked, whether the flange-to-flange distance for the different devices can be provided. This would allow to integrate the various components into the overall linac lay-out (where they need to be fitted in with quadrupoles and steerers) while a detailed design could be provided at a later stage. E. Bravin stated, that usually the flange-to-flange distance is the last parameter that they provide. Therefore, they can only base their space requirements on existing equipment. As a general rule, he claims that 30cm is the minimum space requirement for any type of equipment. U. Raich and L. Soby stated, that for transformers and pick-ups the longitudinal space requirement is of the order of 10cm.

As for the cost estimate, U. Raich said that the previous estimate is considered to be very approximate but at the same time not very wrong. Material and manpower budget need to be separated. U. Raich will re-circulate the previous cost-estimate as a basis for further discussion.

After some discussion the experts agreed to fill the table as much as they can for the next meeting.

2. Concerning the beam current transformer, U. Raich reported that F. Lenardon is looking into multiple suppliers for the ceramics with an aperture of 100mm (requirement from R. Scrivens).

Concerning the emittance device, the construction of a new device was excluded. The idea is now to re-use an existing instrument. U. Raich pointed out that it will require some refurbishing of the vacuum joints (the device is very old and the vacuum joints consist of aluminum wire). The cost of refurbishing the device is estimated to 4kEUR (C. Dutriat). As an alternative solution, the use of a commercial device used in the ISOLDE facility was discussed as well as a new technique (Allison emittance meter). Both options should be looked into by BI and be included in the xls file.

As for the Faraday cups there is no progress.

M. Pasini asked what the situation with the energy spectrometer is. Nobody has looked into this. U. Raich agreed to clarify the situation.

3. K. Hanke asked whether following his request from the last meeting a person has been nominated from BI to follow the beam test of the BSHM device. It is particularly relevant to involve BI in this activity as soon as possible, as the idea is that the BI group would eventually take over the responsibility for this device. This request has not been considered and it was stated that there is nobody available in the group to get involved in this.


The next meeting will be held on Wednesday 25th October 2006, at 10:30 in 37 R-020.

-- KlausHanke - 13 Sep 2007

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