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    24th WP8 Bi-weekly meeting (2015-14) [Sizing of vacuum services]

    → Europe/Zurich
    530/R-030 - BE-EA Conference Room (CERN)

    530/R-030 - BE-EA Conference Room

    CERN

    35
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    Attendance (table, counterclockwise) : Ilias Efthymiopoulos (EN-MEF), Francisco Sanchez Galan ((EN-MEF), Dirk Mergelkuhl (EN-MEF), Jaime Perez Espinos (TE-VSC), Lukasz Krzempek (TE-VSC), Andrea Tsinganis (EN-STI), Damien Brethoux (EN-MEF), Michel Raymond (PH-ADO), Joel Albertone (BE-BI), Helene Mainaud Durand (EN-MEF), Andrea Gaddi (PH-CMX), Riccardo De Maria (BE-ABP), Michael Lazzaroni (EN-MEF), Beniamino Di Girolamo

    News: (Ilias Efthymiopoulos):

    • Hi-lumi TDR should be ready by end 2015. A first version will be circulated mid-october. 
    • The mock-up for fluka anaysis of CMS is ready,
    • There are requests to increase luminosity at P8 to 10^34

    Lukasz Krempek:

    • The presented lay-out shows V1 moving with tTAXS and V2 moving with the vacuum chamber (IP side). BPM and VAX are aligned independently.
    • Cabling requires around 1200 mm^2 cross section (assumed 2 connectors per structure)
    • Piping requires free spaces OD 150 mm for the Bellows. Baking jackets are included in the given enveloppes.
    • Design includes angle valves (assumption is that they won't fail, no need of independent disconnection)

    Jaime Perez Espinos requested the estimated length of services (needed to check timing, conductivity, etc). He pointed out that CMS could have permanent baking jackets, but it won't be the case for the pipes.

    Riccardo De Maria said that the BPM positioning should be done in the range of 2% of the aperture

    Ilias Efthymiopoulos pointed out that an acceptable BPM alignment precision could be in the range of 0.5 (target) to 1 mm (acceptable). This is affected by thermal changes due to energy deposition and movements of the shielding structures, but the stability needs to be around 1 micron. An independent ailignment system within the supporting frame would be needed.

    Notes compiled by Francisco Sanchez Galan (EN-MEF)

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