BI-Linac4 meeting of Thursday 26th April 2007 Minutes by K.Hanke

Present: C.Dutriat, K.Hanke, I.Kozsar, T.Lefevre, M.Ludwig, M.Pasini, U.Raich, L.Soby, G.Tranquille

Agenda: 1. Matter arising from the previous meeting [Hanke] 2. Specs table for 3MeV test stand [Raich] 3. Specs table for Linac4 [Pasini] 4. Emittance scanner (Allison vs. moving slit) 5. Finalize agenda for the up-coming review 6. Instrumentation controls needs for 3 MeV test stand

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1. U.Raich has sent out the invitation and agenda for the Linac4 instrumentation review on 9 May. K.Hanke noted, that none of his corrections to the draft version have been implemented. U.Raich will re-iterate on the agenda. action: U.Raich.

Action for E.Bravin, J-J.Gras, U.Raich to work on controls and read-out for the slow wire scanners. Nothing has been done.

K.Hanke said that the chambers for the slow wire scanners have been manufactured. The next steps will be cleaning and leak testing.

2. U.Raich said that he has the full parameter and specs for the 3 MeV part. Furthermore there is an EDMS document on source and LEBT [link]. It was agreed that U.Raich will provide the specs in electronic form and K.Hanke will upload them on EDMS. action: U.Raich, K.Hanke.

The table has been uploaded on EDMS (840461 v1).

The cost and manpower table for the 3MeV part is still not completed. M.Pasini will send out the table once more. action: BI specialists.

3. M.Pasini showed a 1:20 drawing of Linac4. He pointed out the space constraints between the modules. For the quadrupoles, steerers and pick-up a solution can be found where these three items can be combined. A critical item are the profile monitors, for which BI estimates 20cm longitudinal space which is not available. K.Hanke asked why one cannot use the slow wire scanners, which use only a few cm in the beam line. T.Lefevre said that these devices do not allow for a shot-to-shot measurement. Furthermore, flanges need to be taken into account if it is intended to align the monitors. K.Hanke said that space constraints have a higher priority than the possibility to align the monitors. C.Dutriat suggested installing the SEM grids inside the tanks to gain space.

4. D.Kuchler has proposed the development and construction of an Allison emittance scanner in the frame of the US LARP collaboration. K.Hanke said that the issue of an Allison emittance scanner had been discussed following a suggestion of T.Meinschad in the meeting of 26 February 2007. At the time AB/BI recommended not to use such a device but to use a "traditional" moving slit / SEM grid device. AB/BI is presently looking into the possibility of

a) refurbishing an existing emittance scanner or b) re-building an emittance scanner.

The estimated delivery date is Oct 2007 (for refurbished device) or end 2007 for a new device. G.Tranquille confirmed that they have started to study the monitor. The cost and manpower estimate which AB/BI have submitted by the end of 2006 is based on scanning slit devices and NOT on an Allison emittance meter.

It was agreed that one should talk to the SNS expert during the review of 9 May in order to find out if an Allison emittance meter is feasible for Linac4.

5. See 1. U.Raich will iterate the agenda. action: U.Raich.

6. I.Kozsar said, that AB/CO need as soon as possible the requirements from AB/BI for controls infrastructure (VME crates, PLCs, mains, ethernet cabling…) for the 3 MeV test place. So far they have not received any information. K.Hanke said that this information is available as AB/BI has been requested to specify required rack space etc a while ago. U.Raich will provide the information to I.Kozsar. action: U.Raich. A.o.B This series of meeting will end with the Beam Diagnostic Review planned on May 9th. Any further work on the detailed design of the different instruments will be coordinated internally the BI group.

-- KlausHanke - 13 Sep 2007