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CLIC super-modules

CTC meeting – 2009.11.16. CLIC super-modules. H. Mainaud-Durand, G. Riddone. Motivation. The CLIC cost is driven by the very large number of components Therefore, it is important to reduce the number of components Actions: Supermodules  longer girders (today discussion)

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CLIC super-modules

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  1. CTC meeting – 2009.11.16 CLIC super-modules H. Mainaud-Durand, G. Riddone

  2. Motivation • The CLIC cost is driven by the very large number of components • Therefore, it is important to reduce the number of components • Actions: • Supermodules  longer girders (today discussion) • Superstructures  longer structures • Two accelerating structure will be assembled to form one unit (interconnections in situ are halved) • WFM: for cost estimate two per girder (for test module one per ac. structure for learning process)

  3. Module types and numbers Type 0 Total per module 8 accelerating structures 4 PETS 2 DB quadrupoles 2 DB BPM Total per linac 8374 standard modules DB MB

  4. Module types and numbers • Total per linac • Quadrupole type 1: 154 • Quadrupole type 2: 634 • Quadrupole type 3: 477 • Quadrupole type 4: 731 • Other modules • end sector modules: 92 Type 1 Type 3 Type 2 Type 4

  5. Module sections IP Close to IP  better alignment

  6. Typical module sequences

  7. Baseline • Module length dictated by girder length (CTF2 girder: 1.4 m) and by optics: 2.010 m • Baseline: • snake system with articulation point between two girders (snake system interrupted at each main beam quadrupole) • linear actuators: at present compatible with weight for 2-m long girder • girder material: SiC, 2-m girder fabrication is already an issue

  8. Super modules - What about longer girder • Advantages • Less movers and sensors • Less elements to be transported (several 2-m long girder could already be interconnected at surface) • Less in-situ interconnections (same comment as nefore) • To be considered • Linear actuators compatibility - Preloading is possible? – Cam system • Optics compatibility (see slide #5) • Material compatibility: other materials than SiC could be used, such as steel and mineral cast • More complicate metrology • Better (x1.4) resolution for stepper motors • Additional types of modules • Maintenance strategy: in case of failure, replacement of a 2-m long module is easier than a 4-m long module

  9. Conclusions • Test module baseline must be frozen very soon – proposal to go with 2-m long girder. The length of the modules will not drastically change the scope of the test modules • CTC recommendation: • cost estimate based on 2-m girder length • variants to be studied: • 4-m long girder for MB and DB • 4-m long girder for DB only

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