Minutes of the Linac4 Project meetings

meeting no. 1

date: 04 September 2007

distribution: M. Vretenar; S. Maury; A. Lombardi; F. Gerigk; C. Rossi; K. Hanke; R. Principe; R. Garoby; J. Monteiro; C. Lacroix; R. Scrivens; D. Kuchler; Th. Meinschad; M. Paoluzzi; F. Caspers; S. Ramberger; M. Pasini; R.Wegner; E. Sargsyan; N. Alharbi; G. Bellodi; W. Hofle; P. Baudrenghien, L. Arnaudon; J. Broere; J. Marques Balula; J.-M. Giguet; U. Raich; L. Soby; L. Bruno; Th. Zickler; M. Buzio; E. Bravin; G. Tranquille; T. Lefebvre, C. De Almeida Martins; E. Mahner; E. Page; J. Serrano; W. Weterings; B. Goddard; T. Fowler; J. Borburgh; C. Carli; M. Chanel; M. Martini; V. Chohan; S. Prodon; M. Jones; T. Dobers; B. Mikulec; L. A. Lopez-Hernandez; Y. Body; S. Brown; D. Parchet; M. Silari; F. Corsanego; E. Mauro; P. Bourquin; G. Favre; S. Mathot; Y. Cuvet; M. Timmins.

copy: S. Myers; L. Evans; J. De Jonghe

EDMS: https://edms.cern.ch/document/867589/1


1. Presentation of the project (M. Vretenar)
2. Revisions to the Linac4 design since the TDR (F. Gerigk)
3. Integration of Linac4 equipment in the new building (M. Timmins)
5. Tour de table
6. next meeting

1. Presentation of the project (M. Vretenar)

The Linac4 Project has been approved by the Council at its June Meeting. The approved programme includes (in the 2nd Theme, high priority programme to be achieved by 2011, to eliminate concerns about reliability and technical bottlenecks in the present injection line) the construction of Linac4, replacing Linac2 as injector to PSB, the design of a Superconducting Proton Linac (SPL) replacing the PSB, and finally the design of a new PS (PS2). Construction of Linac4 is approved as a high priority project starting in January 2008 and lasting 4 years (2008-11). The requirement of the management is to start the PSB in 2012 with the new Linac4 beam. Since the Linac4 Technical Design Report (TDR), some changes have been made to the machine design (described in the following presentation by F. Gerigk), but the most important change has been the selection of a new location for the linac, under the so-called “Mont-Citron”. Whereas the previous location in the PS South Hall was more economical, the connection to the PSB was difficult and there was no possibility for future extension of the facility. The new layout under the Mont-Citron is now optimized for a future extension of Linac4 into the SPL, which will be then easily connected to the PS2, making of Linac4 the first element of a renewed injector complex for the LHC. Moreover, the new site offers easy connection to the PSB and adequate shielding. In order to effectively start the project on 1.1.2008, a lot preparation work is required now, in order to structure the project (responsibilities, budgets, planning, communication, EVM), to continue and increase the prototyping effort and to start preparation for large orders (raw materials, klystrons). A Work Breakdown Structure with the names of the responsible for Workunits has been defined, together with a master plan for beam in the PSB in 2012 and the communication and organizational structure of the Project. All these documents have to be finalized before the end of the year. General Project Meetings will be held approximately every month, while more (at the moment, 7) Working Groups on particular topics in the Project will meet more regularly. EDMS is being reorganized to keep into account the new Project structure, and the Web site is being restructured, and will be accessible under Twiki. All White Paper projects must apply EVM from the start (1st January 2008), and IT is presently working at an “EVM light” version (lighter than what has been implemented for LHC), which will be ready by mid-October. The WU responsibles are kindly requested to enter their part of the project into EVM by end of October. This includes a new estimate of resources (personnel and budget) for their WU, which has to correspond to the evaluations that were already provided for the TDR or later. The complete EVM must be ready by end of December, it will require some time for a correct setting up, and this is the reason why we need to receive the first iteration by end of October.

2. Revisions to the Linac4 design since the TDR (F. Gerigk)

Since the TDR (12/2006), the main modification to Linac4 design concerns the RF system: now the linac has a single frequency, 352 MHz, instead of the previous double frequency 352/704 MHz. The klystron layout has been redefined, with the use of two different types of 352 MHz klystrons: the 1.3 MW LEP type and new klystrons at 2.6 MW peak power. The margins on the RF power per resonator have been slightly reduced, reducing the number of RF sources. A new type of accelerating structure at 352 MHz, the PIMS (Pi-Mode Structure) has replaced in the nominal design the 704 MHz Side Coupled Linac. Moreover, the transition energies between structures have been reshuffled, and the beam diagnostics has been redefined. It is now foreseen, instead of using the Radio Frequency Quadrupole from the IPHI Project, to build a new RFQ optimized for the Linac4 parameters, which would be only 3 m in length with an input energy of 45 keV.

3. Integration of Linac4 equipment in the new building (M. Timmins)

Linac4 will be housed in an underground tunnel, at the same level as PSB and PS, placed underneath an equipment building containing klystrons, power supplies and other equipment. An entrance placed at the low energy side at an intermediate level allows access of heavy material to both levels. Equipment building and machine tunnel are about 100m long. An underground transfer line connects the linac tunnel to the existing Linac2 line. A total of 13 (+2 spare) vertical shafts housing the waveguides connect the equipment hall to the linac tunnel.

Tour de table

  • Delay for EVM: the deadline of end October for entering data into EVM is considered challenging, however it is important that at least some preliminary data is available for that date, to check the coherency of data and to start some optimisation. More than entering detailed information, it is important to have by the end of October a clear view of the main deadlines for each Workunit and of the resources required.
  • Personnel issues: at the moment, it is not clear if and when posts can be open for the Linac4 project. In general, the White Paper personnel will be used as first priority to keep the people that have been working for LHC, but the management is trying to find solutions to this issue.
  • Sensitive electronics: the equipment gallery is not air-conditioned, and temperature in summer can go up to 30 degrees. Two air-conditioned Faraday cages are foreseen to house sensitive RF equipment, shielded from possible interference from the klystrons. Some space can be made available for other non-RF equipment.

next meeting:

Tuesday October 16th, room 354 1-001.

-- MaurizioVretenar -

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