Mario Sitta 1CERN – Mon. 7 Jul., 2008

Status of ITSv11Hybrid geometry

Mario SittaUniv. Piemonte Orient. & INFNAlessandria

Mario Sitta 2CERN – Mon. 7 Jul., 2008

Status of ITS geometry

All sensitive volumes already coded in TGeo and checked against blue-prints

Mario Sitta 3CERN – Mon. 7 Jul., 2008

High degree of details

Mario Sitta 4CERN – Mon. 7 Jul., 2008

Status of ITS geometry

All sensitive volumes already coded in TGeo and checked against blue-prints

All services and supports till the SSD cone coded in TGeo and checked against blue-prints

Mario Sitta 5CERN – Mon. 7 Jul., 2008

High degree of details

Mario Sitta 6CERN – Mon. 7 Jul., 2008

Status of ITS geometry

All sensitive volumes already coded in TGeo and checked against blue-prints

All services and supports till the SSD cone coded in TGeo and checked against blue-prints

Services beyond the cone to the TPC interior and some supports (hook, rails) still in old Geant3 code (recode in progress)

Mario Sitta 7CERN – Mon. 7 Jul., 2008

Coarse geometry

Mario Sitta 8CERN – Mon. 7 Jul., 2008

Overlaps

Most of the internal overlaps removed

Removal of remaining overlaps in SSD geometry in progress (13 as of this morning trunk Rev. 27151 + correction files from A.Pulvirenti and E.Cattaruzza)

Overlaps with MUON absorber (8) and TPC (2) removed

Overlaps with FMD (36) still in place (should be checked with FMD people)

Mario Sitta 9CERN – Mon. 7 Jul., 2008

Material budget

Material budget of the sensitive volumes and internal support cones and cylinders checked against calculations; all volumes simulated as in real life

Material budget of the services along the cone checked against calculations; SDD and SSD cables simulated as average volumes

Mario Sitta 10CERN – Mon. 7 Jul., 2008

Ex. SDD cables on cones

Mario Sitta 11CERN – Mon. 7 Jul., 2008

Material budget

Material budget of the sensitive volumes and internal support cones and cylinders checked against calculations; all volumes simulated as in real life

Material budget of the services along the cone checked against calculations; SDD and SSD cables simulated as average volumes

Material budget outside cones: coarse approximation with Geant3 shapes, to be checked further

Mario Sitta 12CERN – Mon. 7 Jul., 2008

SPD services on cones

Main assembly with major volumes:

bus/MCM extenders (cut at the edge of the cones)

plates holding extenders

cooling tubes

Approximations:

straight cables (oriented with the same angle of the cone border)

all extenders of each kind (bus/MCM) built as a single unit

the resulting thickness of bus + MCM extenders gives the size of the hole

Mario Sitta 13CERN – Mon. 7 Jul., 2008

SPD services on cones (II)MCM extender

Plate

BUS extender

Cooling tube

Mario Sitta 14CERN – Mon. 7 Jul., 2008

SDD Survey

SDD sensor positions have been measured after mounting (by means of six fiducial marks located on the upper surface of each detector)

The measurements have been inserted in the survey DB long ago

Class for reading them in AliRoot in preparation:

basic methods to read the ideal (from geometry) and surveyed positions and to store the resulting AlignObj already done

actual code to generate the rototranslation matrices in progress