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Working Group 4 Recommendations:

A Recommendation on the IP Configuration to be Chosen for the ILC Baseline Configuration Document Wilhelm Bialowons (DESY), Thomas Markiewicz (SLAC), Hitoshi Yamamoto (Tohoku U.). Working Group 4 Recommendations: BCD: Two BDS (2 mrad & 20mrad), Two IR halls, separated in z, Two detectors

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Working Group 4 Recommendations:

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  1. A Recommendation on the IP Configuration to be Chosen for the ILC Baseline Configuration DocumentWilhelm Bialowons (DESY), Thomas Markiewicz (SLAC), Hitoshi Yamamoto (Tohoku U.) Working Group 4 Recommendations: • BCD: Two BDS (2 mrad & 20mrad), Two IR halls, separated in z, Two detectors • ACD1: Two BDS (2 mrad & 20mrad), One IR hall, z=0, Two detectors • ACD2: One BDS (X-angle unspecified), One IR hall, z=0, Two detectors, push-pull capability Minimal Configuration • One BDS, One IR Hall, One detector designed so as to permit construction of a second BDS, IR Hall and detector at a later date.

  2. Cost Information • If need to also dig more linac tunnel, IP savings applied to Energy Reach reduced “several %” • On 2005.11.16, 1 € = 139.5 ¥ = 1.169 $ or 1 $ = 119.3 ¥

  3. Conclusion If civil cost proportional to volume of excavation we neglect any gain from having one large IR rather than 2 smaller IRs Cost(BCD)=Cost(ACD1) Cost of 2nd IR Hall only ~ 30M€, 58M$, 78·108¥ Cost Increment(ACD2)-Cost(Minimal)<< Cost(Detector) WG4 not ready for recommend a configuration for down-select Cost numbers not internationally agreed upon Sub costs related to IR (Halls vs. dumps vs. beamline CF vs. beamline Hardware) vary greatly Stay with Baseline 2-20mrad Configuration while WG4 & CDE Board do their work

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