1. EUDET HCAL prototype; mechanics Felix Sefkow Work by K.Gadow, K.Kschioneck CALIC collaboration meeting Daegu, Korea, February 20, 2009

2. MC HCAL mechanics Felix Sefkow February 20, 2009 2 Status Barrel structure Prototypes Handling and Measuring

3. MC HCAL mechanics Felix Sefkow February 20, 2009 3 Barrel structure Reminder: started from TESLA structure 2 halves (rings), 8*2 sectors: 32 modules Advantages: –layer-wise electronics (DIF, power) at end face, accessible at short access –Maximum filling between inner and outer radius Drawbacks: –Less rigid –Some space required at barrel end face, but this can be made as compact as for the ECAL Pointing cracks: not a serious issue –There is material: rather a dead region than a crack, <<, ~ X 0, not critical for hadrons –Implemented in Mokka

4. MC HCAL mechanics Felix Sefkow February 20, 2009 4 FEM calculations Adapt ILD parameters Implement module details (plates, side panels) in full barrel structure Maximum deformations tolerable Understand how to support system Know forces between modules Max 0.1 mm Max 3 mm

5. MC HCAL mechanics Felix Sefkow February 20, 2009 5 Integration HCAL has to stand on tip, two rails at 4 and 8 o’clock Different scenarios for assembly and ECAL installation

6. MC HCAL mechanics Felix Sefkow February 20, 2009 6 Horizontal rototype Horizontal cross section: 4 plates, full size –Control of mechanical tolerances and fixation techniques over the full extension –Mechanical interplay with the active layer and insertion procedures –Heat dissipation and thermal properties, gradients –Electronic signal transport and integrity over the full length of read-out lines –Calorimeter signal uniformity over the full area Need 6 HBUs for 1 slab, 12 for a layer

7. MC HCAL mechanics Felix Sefkow February 20, 2009 7 Vertical prototypes Vertical cross sections, 36 cm deep –Mechanical stability, deformations under various orientations and stresses –Accumulation of tolerances in the stack structure –Connectivity with external electronics –Multi-layer signal processing and concentration –Integration of controls, supplies and services and cooling under tight spacial constraints With 12 HBUs more than sufficiently instrumented for e.m. showers –See minical

8. MC HCAL mechanics Felix Sefkow February 20, 2009 8 Scalable structure Towards a full HCAL prototype Adaptable to overall layout of test beam configuration –ECAL, B field Can still use existing movable table

9. MC HCAL mechanics Felix Sefkow February 20, 2009 9 Handling, measuremnts Tools in place for handling 750t objects First measurements done on table, next in hanging position Flatness tolerances of commercially available rolled material by far not sufficient –Back-up: machine; but expensive Plan to explore measuring and rectifying

10. MC HCAL mechanics Felix Sefkow February 20, 2009 10 Material properties Composition –Ni at lower limit Magetic tests –Using 4T magnet –Different suppliers –Before and after cutting, welding –OK so far, quantitative results not yet

11. MC HCAL mechanics Felix Sefkow February 20, 2009 11 Measure forces Small prototype with original size panels and screws –Will also test welded structure Force and deflection sensors, data logger Verify FEM model

12. MC HCAL mechanics Felix Sefkow February 20, 2009 12 Conclusion Following barrel design with end face electronics –In principle works for scintillator and gas We will have mechanical structures in place this summer –On EUDET schedule –Can receive first HBU with SPIROC2 (only) These are technical prototypes, following ILD design –SiD issues are very similar We are collecting a lot of experience –Handling, tooling, tolerances We are gathering realistic cost and production time data –Also relevant for “Videau” structure To be continued in consultation with MPI engineers