Minutes of the Linac4 Diagnostics Working Group Meeting held on 19 January 2009

Present: U.Raich, J.Tan, G.Bellodi, L.Soby, G.Tranquille, C.Dutriat, F.Lenardon, J-J.Gras, A.Lokhovitskiy, R.Scrivens, C.Carli, T.Hermanns, K.Hanke, B.Mikulec.

Agenda:

1. Communications

2. Follow-up of open actions

3. Highlights from the CARE emittance measurement workshop

4. Feschenko monitors (R.Scrivens)

5. Summary of the APL proposal on laser profile monitors (U.Raich, K.Hanke)

6. Measurement precision of current transformers (F.Lenardon)

7. AOB

1. Communications

PSB review: Last week the PSB review with Linac4 took place. K.Hanke mentioned that there has been an ad-hoc discussion on diagnostics after the presentations. The review committee underlined the importance of sufficient beam instrumentation. The following diagnostics were mentioned in particular: a large view screen to visualize both the injected and the circulating beam at once; measurement of the electrical signal from the stripping foil; at least 3 PUs in the ring that can measure turn-by-turn; BLMs; segmented H0/H- dump (foil degradation) with view screens in front; laser emittance measurement (not only after the Linac4 exit, but another one as close as possible to PSB injection). The slides of the committee recommendations can be found here (closeout.pdf).

Diagnostics WG: K.Hanke started compiling an EDMS document summarizing the current conclusions of the diagnostics working group before handing over the organization of the working group to BI (U.Raich and J-J.Gras). L.Soby underlined the importance of having clear written specifications available as soon as possible.

2. Follow-up of open actions

Simulations for emittance meter slit: U.Raich reported that O.Aberle started to work on the slit simulations.

BLMs: One of the upcoming meetings should be dedicated to a status report and discussion on BLMs. In this context it would be good to have G.Bellodi commenting on the loss distribution along the Linac4 line. Will it be possible to simulated the PS fringe field to finalize the loss distribution along this part of the Linac2 transfer line?

Dimensions of BI equipment for diagnostics bench: U.Raich said that the longitudinal dimensions of the BI equipment to be installed on the diagnostics movable bench are known and that they fit with the proposal made by G.Bellodi (see last minutes). He has a meeting this week with the drawing office to discuss how to proceed in order to obtain rapidly the required drawings. One worry is that the French deny to have the drawings of their magnets to be installed on the bench still available. It has to be seen if they can be found back or if enough information can be found in the CATIA drawings.
Link to the planning of the 3 MeV test stand: https://twiki.cern.ch/twiki/bin/view/SPL/TestStand

Wire scanners for 3 MeV test stand: C.Dutriat has found a motor to replace the contaminated motor for one of the 3 MeV test stand wire scanners. He would first like to confirm that the motor is really equivalent and will then proceed to its exchange.

-- BettinaMikulec - 19 Jan 2009

  • closeout.pdf: Recommendations of PSB with Linac4 review committee.
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