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BCD: ILC Cryomodule from Type III

BCD: ILC Cryomodule from Type III. Take TTF Type III as reference conceptual design Introduce layout modifications required to fit ILC requirements: Quadrupole/BPM package at the center (symmetry and stability) Review pipe sizes/positions according to gradient and cryo-distribution

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BCD: ILC Cryomodule from Type III

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  1. BCD: ILC Cryomodule from Type III • Take TTF Type III as reference conceptual design • Introduce layout modifications required to fit ILC requirements: • Quadrupole/BPM package at the center (symmetry and stability) • Review pipe sizes/positions according to gradient and cryo-distribution • Consider/include movers (warm) at the center post for x,y quadrupole beam based alignment • Consider/include movers on the cryomodule supports to optimize the module centering according to HOM data • Review suspension system (post, etc.) for stability and transport • Review all the subcomponent design for production cost and MTBF • Materials, welds, subcomponent engineering, LMI blankets, feed-through, diagnostics and cables, etc. • Module assembly issues • Reduce the waste space between cavities for real estate gradient • Flange interconnection, tuners, etc. • Define all the QC and QA steps required to assure MTBF Carlo Pagani

  2. Cavity Quad Cavity ACD: Alternative for Quadrupole • Independent Cryomodule for the Quad proposed by SLAC • Pros: • To be analyzed wrt the upgrade of TTF 3 with movers • Cons: • More expensive: Valves, independent He supply and return, etc. • Consistent impact on real estate gradient because of vacuum valves and unavoidable bellows: 2 x 350 mm at least: i.e. ~ 0.5 km/linac (~ 25 M$/linac) Carlo Pagani

  3. Q20: # of Cavities per Cryomodules • From 8 to 12 is acceptable without major design changes • Cryomodule does not have strong reasons to prefer one specific number • Vacuum vessel and HeGRP thickness can be adjusted to improve momentum of inertia in a longer module: Constant deformation • Cost impact on the linac was studied with industry for TDR and the result was that the effect should be in within the error bar because of pros and cons: • Module assembling slightly less expensive but handling and transport is more • Module reference milling machining more expensive • Decision drivers: • RF Distribution: Cavities/Klystron and wave-guide distribution scheme • Modest impact on real estate gradient and tunnel length: • The impact of each module interconnection is at present 380 mm and cannot be decreased substantially because it includes vacuum valves, He retourn connection and 70 K HOM absorber • At 30 MV/m gradient the impact on linac length is: ~ 55 m (10) or 136 m (8) Carlo Pagani

  4. Q31: Linac Cavity Spacing As short as possible! • Electromagnetic constraint for 70 mm beam pipe: ca. ≥ 180 mm • TTF 3 Spacing: ~ 3/2 i.e. > 340 mm ! • TESLA TDR Spacing: 283 mm • There is a lot of margin for improvement • Each cm saved as an impact of 85 m on the length of each linac • BCD should be based on 250 mm: > 750 m/linac saved • ABD could be the work for 180 mm: > 1,3 km /linac saved TTF Cavity Interconnection 340 mm between irises Carlo Pagani

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