Discussione con i Referees di Mu2e: situazione di Lecce F. Grancagnolo 11 Dicembre 2013

SUMMARY We consider the Lecce group involvement in the Mu2e tracker concluded. Following the referees’ suggestions, we have proposed to strengthen the EMC group by collaborating to the calorimeter mechanical structure. We present today the current Lecce situation, the work strategy for 2014, financial requests and cross-relations between Mu2e and MEG.

F.T.E. (al 01.01.2014) Mu2e MEG note C. Carissimi Dottorando (Ingegneria) 100 - M. Cascella Ass. Ric. (Fisica LE) Ass. Ric. concluso. ora a UCL. Vincitore Marie-Curie su MEG DCH. E' 30-70 nei libroni 2014 E. Cavallo sarà sostituita con bando in corso di espletamento G. Chiarello Dottorando (Fisica LE) non è presente nei libroni 2014 F. Grancagnolo Dir. Ric. INFN 30 70 A. Maffezzoli P.O. (Ingegneria LE) 50 dopo marzo '14, congelamento meccanica di MEG E' 30-20 nei libroni 2014 M. Panareo P.A. (Fisica LE) A. Pepino Dottoranda (Fisica LE) borsista tecnologa INFN nei libroni 2014 G. Piacentino P.A. Univ. Marconi percentuale da confermare dopo il rientro da Fermilab P. Primiceri Borsa Tecnologica INFN G. Tassielli Ric. Univ. (t.d. Fisica LE) vincitore FIRB su Clu. Cou.: percentuali da confermare. è 50-50 nei libroni 2014. A. Taurino era sull'I-tracker: sarà sostituito da X. Y. su calorimetro G. Zavarise come Maffezzoli W. Z. Ass. Ric. Senior INFN Posizione assegnata da Direttivo su proposta del CTS bando da pubblicare a gennaio 2014 TOTALE 380 770 Erano 4.2 e 6.3 sui libroni 2014

Remarks on f.t.e. Mu2e/LE on Calorimeter -10% today with respect to "preventivi" 2014 on I-Tracker 6 researchers, 3.8 f.t.e. => 63% per researcher MEG/LE +22% today with respect to "preventivi" 2014 8 researchers, 7.7 f.t.e. => 96% per researcher complete orthogonality of f.t.e. between Mu2e and MEG except for F.G., but with a clear indication of his priorities complete orthogonality of activities and competences between Mu2e (essentially technological activities performed by engineers on the Calorimeter mechanical structure) and MEG (essentially activities made by physicists on design, wiring and track reconstruction of the drift chamber)

Calorimeter Mechanics Sharing of responsibilities for 2014 Lecce Design of the crystal support structure Fabrication of a single wedge prototype with fake crystals at LNF LNFrascati Service Integration: electronics, cabling, cooling, ... System Integration: alignment, disk translation, ...

Assume hexagonal crystals Crystal support structure Assume hexagonal crystals 6-fold azimuthal symmetry 12 identical 30° sectors build a “honeycomb” structure cut to shape arrange sectors between structural support rings

*from A. Maffezzoli lectures – Università del Salento Honeycomb: produzione per corrugamento* L’adesivo è applicato sui nodi corrugati, i vari fogli corrugati sono impilati in blocchi, l’adesivo nei nodi è curato ed i pannelli sandwich sono tagliati dello spessore voluto. E’ usato per honeycomb ad alta densità e per quelli in alluminio e titanio *from A. Maffezzoli lectures – Università del Salento

Candidate materials for a honeycomb structure for the calorimeter Assembly of corrugated sheets can be made of aluminium alloys steel titanium carbon fibre reinforced thermosetting composite matrix carbon fibre reinforced thermoplastic composite matrix The choice of the material will mainly depend upon rigidity, hygroscopicity, on design requirements like degassing properties, inner walls reflectance, geometry, mechanical tolerances, wall thickness, assembling procedures …

Strategy for Lecce contribution on Mechanics during 2014 Depending on the choice of the crystal, Study the structural properties of the honeycomb material (specific software required) Depending on chosen material, define the fabrication procedure of the honeycomb structure Design and build the necessary proper tools Fabricate (with LNF support) a prototype (2*1/12 wedge) with fake crystals Test, correct, finalize design Goal: to have a conceptual design and, possibly, a wedge prototype tested and ready by the CD2 presentation (end of Spring 2014)

Financial requests Ask for re-addressing of 2014 resources to described plan and clear s.j. (20 Keuro "missioni" + 18 Keuro "consumo") to start studying structural properties as a function of the chosen crystals and, therefore, proper materials and to prepare the necessary tools for prototype construction. After preliminary studies (June 2014), we'll be able to estimate real cost of the entire support structure.