SPL Front End - 3 MeV Technical Coordination Committee

3MeVTCC

Minutes of Meeting 65 held on 1 September 2010

Participants: G. Bellodi, E. Berthome, B. Cheymol, A. Dallocchio, T. Dobers, D. Gerard, F. Lenardon, A. Lombardi, C. Maglioni, O. Midttun, B. Mikulec, M. Paoluzzi, B. Puccio, F. Roncarolo, C. Rossi, M. Sordet, D. Steyaert, S. Tavares, M. Widorski.

Table of Contents:

1.     InformationC. Rossi

2.     Status of the design and fabrication of the Linac4 movable test benchD. Steyaert

3.     Status of the design of the emittance meter slitE. Berthome

4.     The Beam Interlock Control (BIC) for the 3 MeV Test StandG. Bellodi

5.     Tour de Table (comments by the representatives of the different teams)

The next meeting will be held on 3 November.

Relevant links

3 MeV Test Stand web page

EDMS document of this meeting

3 MeV Test Stand layout (phase 1)

3 MeV Test Stand general infrastructure (electricity and water)

3 MeV Test Stand "cablotheque"

3 MeV Test Stand planning


1.  Information – C. Rossi

C. Rossi's presentation

A presentation is given by G. Bellodi about the work that is being done for the preparation of the Beam Interlock Control (BIC) for the Test Stand, showing the different options that are currently under discussion.

D. Steyaert will then present the progress in the preparation of the Test Stand diagnostic line.

The next cabling campaign will mainly concern the installation of the RF amplifier for the third buncher cavity and the installation of the diagnostic line. This work, initially foreseen for the end of September, has been delayed to allow performing an important RF test on the PIMS prototype cavity. For this reason a special bunker will be built at the Test Stand; however this test will not perturb the activity of development of the ion source, which remains our top priority, as far as the operation of the Test Stand is concerned. A proposal for the naming convention of the diagnostic line has been sent to the people in charge of the different equipments and a confirmation is required before the cable list can be established.

Three workstations have been ordered to be installed in the Test Stand control room, that we will try to prepare for September.

A new planning for the Test Stand has been partially prepared; however I am waiting for the definition a new schedule for ion source activities before it can be published.

The fabrication of the Linac4 RFQ is now focused on the preparation of the T1 for the second brazing that should occur at the beginning of October. The semi-finishing of the T3 is in progress and the first brazing step is foreseen for the beginning of November. A new planning for the realization of the RFQ will soon be presented by S. Mathot.

General interest and follow-up from previous meetings

Please check Test Stand activities and documentation at: https://twiki.cern.ch/twiki/bin/view/SPL/TestStand

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2.  Status of the design and fabrication of the Linac4 movable test bench – D. Steyaert

D. Steyaert comments the list of components of the Test Stand diagnostic line, in order to summarize the progress that has been made since the  last meeting (30.06.2010) in the design and fabrication of the diagnostic line  (D. Steyaert's presentation):

All five pick-ups for the diagnostic line will be delivered at the same time, due to the late delivery of the ceramic feedthroughs.

The vacuum chamber inner diameter has been reduced from 67 to 66 mm in order to adapt to pipe sizes available at the CERN store. Flange sizes do not change.

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3.  Status of the design of the emittance meter slit – E. Berthome

E. Berthome present the progress made in the design of the emittance meter slit so far  (E. Berthome's presentation):

A compensating system has been designed in order to assure the precision required with an optional second bellow to keep the vacuum volume constant during the movement of the mechanism. The vacuum tank still require some finalization work and the supplier for the movement mechanism has still to be chosen.

Two samples of graphite plates have been received from one possible supplier and they are being qualified at the metrology workshop.

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4.  The Beam Interlock Control (BIC) for the 3 MeV Test Stand – G. Bellodi

G. Bellodi introduces the different options that are under discussion for the realization of the Beam Interlock Control (BIC) that can act as a safety interlock system for the protection of the personnel accidentally accessing the Test Stand during operation  (G. Bellodi's presentation):

The aim of such system is to provide a condition for the beam permit under safe operational condition; hence the local device-specific interlocks are not included into this chain and are left to the responsibility of the owners.

The possibility is being considered to introduce into this interlock chain also the access interlock, meaning the chain of the contact switches that will be installed on the access doors to the Test Stand area.

The logic for the enabling of the RF amplifier of the ion source must be inverted in order to integrate the RF amplifier in the BIC system.

The BE safety unit will be consulted for the final choice of the appropriate system.

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5.  Tour de Table

T. Dobers: The alignment team requires to participate to the workshop follow-up meetings; regular invitation will be sent to its representatives M. Jones and T. Dobers.

F. Lenardon: Two BCTs will be finished before the end of September; the installation date for the LEBT BCT will be given by R. Scrivens as soon as a new schedule for the ion source development is available.

The next 3MeVTCC meeting will be held on 3 November.

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