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1m 3 SDHCAL Mechanic Structure

1m 3 SDHCAL Mechanic Structure. M.C Fouz 8/10/2010. The 1m 3 prototype Mechanical Structure is financed by: Spanish HEP National Program by the project FPA2008-02142. OUTLINE. The design Quality Control tests Assembly tests and tooling Schedule and costs. General requirements.

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1m 3 SDHCAL Mechanic Structure

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  1. 1m3 SDHCAL MechanicStructure M.C Fouz 8/10/2010 The 1m3 prototype Mechanical Structure is financed by: Spanish HEP National Program by the project FPA2008-02142

  2. OUTLINE The design Quality Control tests Assembly tests and tooling Schedule and costs M.C Fouz

  3. General requirements 40-50 absorber plates (stainless steel) interleaved with the detector cassettes. 20mm passive absorber material, including the cassettes. The mechanic structure should allow to accommodate GRPC as well as MICROMEGAS (It will be instrumented first with GRPC but it was planed to built some MICROMEGAS that must be tested on the same mechanic structure) It must allow the insertion and further extraction of the cassettes The prototype not only must prove the technology and serve us to get experience on the operation and performance but also on integration and technical issues of building an ILC-like module. M.C Fouz

  4. Towards a Technological Prototype • The aim is to build a realistic prototype as close as possible to the solution proposed for the ILD concept. •  Validate the technological solution • Self-supporting mechanics • Minimize dead zone • One-side services ILD - SDHCAL LOI design Module Barrel Module M.C Fouz

  5. Towards a Technological Prototype Technological prototype : 40 detector plans of 1m2 : 20mm stainless steel (absorber + cassette support) 6mm GRPC Cassettes. Electronic side Absorber plate Spacers Absorbers will be assembled together using lateral spacersfixed to the absorbers through bolts. The dead spaces have been minimized as much as possible taken into account the mechanical tolerances (lateral dimensions and planarity) of absorbers and cassettes to ensure a safe insertion of the cassette. Design independent of the detector technology to be used (RPC and MICROMEGAS) M.C Fouz

  6. Absorber Mechanic structure – Details Absorber Spacers Bolts 2x11 bolts/plane M8 Absorber Plates: 1011 x 1054 mm2 lateral dimensions 15 ± 0.05 mm thick Surface Planarity < 250mm Spacers: 13 mm thick Material: Stainless steel 304L (permeability , as measured, 1.5  it allows used it in B=4T) M.C Fouz

  7. Simulations Detailed study has been made to evaluate the robustness of this structure in different positions. It is important to evaluate the deformations and the stress that the structure can suffer when moving and rotating, the deformations will be also transferred to the GRPC detector ANSYS numerical simulations performed on the deformation and stress Max. deformations don´t exceed 150 microns. The punctual max. stress it is only 74 Mpa, well away from the elastic limit of the material The max. reactions on the M8 bolts are: Fx= +/- 17955 N, Fy= - 694 N, Fz= +/- 2249 N M8 bolt have the elastic limits, function of the material, between about 10000 N to 40000 N. This is the situation more adverse for the M8 bolts. M.C Fouz

  8. Plates & Quality Control To reduce the gaps it is needed a good planarity of the absorbed plates. The tolerances of the standard market are higher (several mm) than our needs(hundred of microns), the plates need to be further machined to achieve the precision we are interested in It is not easy to achieve the precision. Tests done at different companies to find a supplier that guarantees our needs. Quality control during the mass production of the plates will include verification by the company, both of the thickness and the planarity, and then a crosscheck will be performed at CIEMAT by using a laser interferometer system (Precision 30-40 mm for the planarity measurement).. M.C Fouz

  9. Plates - Planarity measurement procedure 3 pins support the plate In order to disentangle the planarity measurement from the table shape Support pins Pin M.C Fouz

  10. Plates - Planarity measurement results a) Theoretical deformations computed for the plate supported by the three pins. b) Laser measurements of the surface of a real plate c) Surface plate planarity computed as b) – a) a) b) c) Pin location Pin location Planarity values Pin location Pin location M.C Fouz

  11. Plates - Planarity measurement errors In order to check the accuracy and stability of the measurements the same plates have been measured several times in the same conditions and also supported by the pins in different positions. The differences between the different measurements are inside the 30-40 mm error provided by the laser interferometer system. Surface A Surface B Differences between two measurements of the surface plate performed with support pins in different positions with respect to the plate. For both surfaces of the plates. M.C Fouz

  12. Assembly tests & tooling A specific tool for handling the plates has been designed and built Suction pad Security System 4 absorber plates (bad quality) assembled to test the procedure Special table to support the 6ton prototype The mechanical structure should be finished by march 2011 M.C Fouz

  13. Rotation tool The 1m3 prototype is a heavy structure (~8500 Kg) that we need to move and eventually rotate (for cosmic tests at the lab for example). Tool under design now M.C Fouz

  14. Schedule & Costs Timing: The most time consuming is the verification of the plate planarity  Manipulation of the plate  Regulation of laser for each measured line ~2.5 – 3 hours/plate At least 30 plates must arrive to CIEMAT before the end of the year The structure should be finalized by March 2011 Cost: ~ 3000 euros /plate ~1000 euros for material the rest is for machining Due to the relation between the final dimensions of the plates and the standard dimensions provided by the market it has some extra cost The cost of the other components and tooling are marginal with respect to the plates It is financed by: Spanish HEP National Program by the project FPA2008-02142 M.C Fouz

  15. BACK UP M.C Fouz

  16. Towards the 1m3 prototype: GRPC Mechanic structure - Cassette Thickness adjusted to be the same as Micromegas cassettes DIF Cassette to include the GRPC detector and associated electronics Vertical Cassette insertion test Horizontal Max: 0.5mm Max 5.9 x 10-5 mm Deformation under its own weight as a function of storage orientation aperture 12.5 mm Successful insertion from above M.C Fouz

  17. Towards the 1m3 prototype: Absorber Mechanic structure – First ideas gravity Details of the guiding system. The rails are fixed on the absorber. Attachment device Are fixed on the top and bottom spacers. Absorber Absorber Each detector module it is supported on the absorber by 6 wheels fixed on the cassette support of the detector. cassette DIF This design is not suitable for a “final” detector: - Too much dead spaces - Expensive DIF M.C Fouz

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