Stabilisation day #6

Brief news from CLIC module WG

G. Riddone on behalf of the CMWG, 09.06.2009

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Content

Recall of baseline design for CDR

Design evolutions (from version 2 to version 4)

Future work

G. Riddone, SD#6, 09/06/2009

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Module design baseline

G. Riddone, SD#6, 09/06/2009

Accelerating structure: CLIC G (100 mV/m, L = 230 mm, aperture ~ 5 mm)

PETS: CLIC note 764 (6.5 MV/m, L=310 mm, aperture 23 mm)

1 PETS powering 2 accelerating structures

Beam interaxis: 650 mm same height for the two beams Accelerating structures and PETS + DB Q on girders (same

girders based on MB girder design) Girder end supports cradles mechanically attached to a

girder and linked by rods to the adjacent one: snake-system adopted(DB: 100 A, MB: minimization of wakefields, validation at 30 GHz in CTF2)

Separate girders for main and drive beam possibility to align DB quadrupole separate from accelerating structures

Separate support for MB Q and its BPM MB Q and BPM rigidly mechanically connected Common actuators/devices for stabilization and beam-based

feedback systems

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Module type 1

G. Riddone, SD#6, 09/06/2009

MB Q + BPM 6 AS

2 DB Q + BPMs

3 PETS

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Module type 1 – version 2

G. Riddone, SD#6, 09/06/2009

All 3D models made by A. Samoshkin

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Module type 1 views – version 2

G. Riddone, SD#6, 09/06/2009

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CLIC two-beam module - version 2

G. Riddone, SD#6, 09/06/2009

Continuity between girdersAll MB girders have the same lengthMB Q support passes over the MB girderMB Q beam pipe and AS beam pipe are coupled via bellows

CTF2

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CLIC two-beam module - version 4

G. Riddone, SD#6, 09/06/2009

No full continuity between MB girders (increasing of align. cost)MB girder length changes as function of module type No girder underneath MB Q Beam height loweredMBQ support simplified MB Q beam pipe and AS beam pipe are coupled via bellows

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Future work

G. Riddone, SD#6, 09/06/2009

At present the beam height is imposed by the drive beam: Height of the girder (same as for MB

girder) DBQ support DBQ dimensions

ACTIONS Calculation for the DB girder has been

launched to optimise its size and with the aim of lowering its height

Confirmation of DB Q dimensions and support (CERN-Crockford institute)