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Update of detector hall in mountain region

Update of detector hall in mountain region. May 22, 2011 @LAL-Orsay Y.Sugimoto. Sample site. Exp-hall. Access tunnel. Shape of cavern. Study of 2 sample sites in Japan Both sites have very good geology of granite Depth of the cavern is less than 300m

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Update of detector hall in mountain region

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  1. Update of detector hall in mountain region May 22, 2011 @LAL-Orsay Y.Sugimoto

  2. Sample site Exp-hall Access tunnel

  3. Shape of cavern • Study of 2 sample sites in Japan • Both sites have very good geology of granite • Depth of the cavern is less than 300m  Shape of the cavern can be bullet shape rather than egg shape

  4. Access tunnel • Location of solenoid construction • In the cavern  larger cavern (DL~40m?), smaller access tunnel • On surface  smaller cavern, larger access tunnel • Cost is similar for both cases, but on-surface assembly is more convenient and less risk  On-surface assembly with large (h=11m) access tunnel • Access tunnel to 2nd detector • It has to go underneath the BDS tunnel, and should not be so large • Smaller access tunnel for the 2nd detector (SiD?) • Solenoid of the 2nd detector should be carried through the larger access tunnel, and go through the area of the 1st detector • What is the minimum size of the smaller access tunnel(input from SiD)? • Helium compressor for solenoids • He compressors can be placed in the large access tunnel • Distance between the detector solenoid and the compressor < 200m (?) • KEK cryogenic group (Y.Makida et al.) has joined this study

  5. Solenoid transport - 225t/5axles  450t with 2-trailers - Capable of ~7% slope

  6. Solenoid transport Enough space for detector solenoids

  7. Other issues • Detector service caverns • What is the required size to enclose detector power supplies, cooling plants for the detectors, power supplies and refrigerators for solenoids, etc? • Beam line height? • To be decided in this workshop • Do we need service tunnel and survey tunnel for accelerator? • Can we share the access tunnel for detectors with accelerator (DR, BDS)?

  8. Earthquake • Belle detector after 3.11 • Bell detector was rolled out from the beam line and fixed to the ground • 32 fixing bolts (M22) have been broken by the earthquake, and Belle detector moved 6 cm on the rail • How should platforms be supported on the occasion of big earthquake? • Move with the ground? • Isolated from the ground? Seismic isolation support for buildings

  9. Earthquake • Isolation from the ground can be achieved using air-pads, but • Enough gap between side wall is necessary • Positioning actuators should be retractable • Very flexible bellows should be placed between QD0 and QF1 to avoid damages to the inner detectors

  10. Towards DBD • Impact of 3.11 • Some collaborators of KEK who belong to facility group, cryogenic group, Acc. group are occupied with repairing works at KEK and JPARC • Hopefully, they will come back to ILC work by autumn • In cooperation with the experts mentioned above, we will make designs necessary for the mountain site: • Underground cavern and the access tunnel • Detector solenoid/cryogenic system • Other utilities

  11. backup

  12. RDR

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