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    CLIC Technical Committee - Meeting #65

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    18/3-008 - CLIC Meeting room (CERN)

    18/3-008 - CLIC Meeting room

    CERN

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    Hermann Schmickler (CERN)
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    CLIC Technical Committee - Meeting #65 (06 Nov 2012)

    Chaired by: Dr. Schmickler, Hermann

    General Information

    Hermann requested feedback from the Arlington ILC meeting. Andrea informed that the meeting was slightly disppointing with sessions in which not much people seemed interested. 

    Hermann expressed the need for a more detail plan for actions. He suggested to have  a plan for the milestones expected for the next three years. Discussions on open work done up to now, open issues not addressed yet and plans for  the future will be scheduled in this meeting and the following ones. These discussions will serve also to review the needs for next year budget requests. 

    CLIC Module DB girder alternatives. Guido Sterbini

    In order to maintain the efficiency of the drive beam, the beam losses have to be maintained very low. The working hypothesis is that in order to keep losses to a reasonable level, the three-sigma beam envelope should not go above 6mm. Simulations also indicate that the beam envelope sensitivity to PET missalignment is three orders of magnitude smaller than for the quadrupole misalignment.
    The  pre-alignment tolerances for the components in the module are:
    • BPM: 20 microns wrt the girder and including electronics,
    • Quad: 20 microns wrt the girder (magnetic center).
    • PETS: 100 microns wrt the girder.
    • Girder to craddle: 10 microns.
    • Cradle to alignment reference: 20 microns
    Guido focalised on moving the girders alone with actuators in order to realign all components after installation. Four different configurations with 2 or 4 meter-long girders and with and without snakes have been considered.  Scenario 4 consisting in 4 meter long girders with snakes alignment in between does not match the requirements for almost any tolerance. Scenario 2 and 3 both with four actuators per 8 quads can meet the requirements with a pre-alignment for the quads of 20 microns.  The scenario 1 in which eight actuators move eight quads fullfills is still the preferred one and allows for larger pre-alignment tolerances without compromising efficiency. 
    A proposal using a weaker focusing with less quadrupoles was envisaged but this will tighten the requirements in the orbit and energy stability out of the combiner ring. 
    Re-steering frequency should be driven by the detection of performance loss. One week is being considered but a deeper discussion is needed. A specific meeting will be organized on this issue to conclude. (Action: Guido)
    Hermann suggested to shorten the beam driver linacs and lessen the number of quadrupoles. 

    Status and plans for 2013.

    CLIC two-beam module developement. G. Riddone, A. Samochkine

    The first Type-0 laboratory module is finished and under leak tests. First alignment tests were done. Thermo-mechanical tests, alignment and transport tests are scheduled for 2013. A second Type-0 laboratory module is in different stages of procurement and it will be assembled in 2013
    For the CLEX Type-0 prototype, the first double length PET from CIEMAT has been assembled. Supporting system is under fabrication and the accelerating structure under machining in VDL. The second doble-lengh PET, supporting system should be still fabricated in 2013. Full assembly is planned for 2013. This module should be ready for installation in CLEX in 2013.
    Hermann suggeted that more control should be exerced in the budget of this project. He requested that a single slide presenting the project timeline  within a well defined budget should be presented. (Action: Germana, Alexander)

    Superconducting wiggler. P. Ferracin.

    Two prototypes are being manufactured. One vertical racetrack in Nb3Sn at CERN and a horizontal racetrack model in NbTi as a collaboration between BINP and KIT.
    For the NbTi wiggler, a short prototype with ten poles will be tested at the end of this year. After a review of the TDR in early 2013, the delivery and test of the final wiggler in ANKA is expected in 2014. 
    For the Nb3Sn development at CERN, a test coil was manufactured already in 2011. For next coils insulation needs to be reinforced. Next steps still need to be discussed.  

    CLIC kickers. M.J. Barnes

    Two different striplines with flat and half-moon electrode shapes are being studied in detail: one of these will be built in Spanish industry during early 2013. After testing at IFIC and CIEMAT the prototype striplines will be shipped to CERN for acceptance, however measuring the field uniformity will be challenging, and may not be possible without installing the striplines in an accelerator facility.
    The prototype will be shipped to a facility for testing with beam: ALBA (without inductive adder, during 2013) and/or KEK (with inductive adder, most probably in 2014) are presently envisaged. The choice between Alba and KEK should be driven by the optics and performance of each site. Hermann proposed to look also for proton machines for these tests. (Action: Mike). A follow-up of these tests should be schedule in the CTC. (Action: Nuria)
    For the inductive adder, first components for a first layer have been ordered and it will be built in early 2013. Procurement and tests will continue in 2013 with the aim or testing the inductive adder, together with the striplines, in an accelerator in 2014.



    Next meeting will be held in December 11th. 
    Reported by Nuria Catalan Lasheras

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