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CERN Summer Student 2002

Describing ATLAS Detector with AGDD

Mercedes PanicciaUniversity of Rome “La Sapienza”

DetectorDescriptionDatabase

Simulation

Reconstruction

Offline SoftwareDesign

Test

ATLAS Muon System

ATLAS offline software for the Muon Spectometerobtains detector description data from two ASCIIdatabases:

ATLASMuonDataBase

ATLASGenericDetector

Description

ATLAS Muon Data Base Formatted ASCII file Basic parameters for the geometry:

active material & inert matter Algorithms to build geometrical structures embedded

in the application programs

********* End-cap Toroid ***************************************************

M ENC 2 | ENC Description version

4 ! *** CRYOSTAT ****************** Matter identifier

783.00 1283.00 90.50 ! Z_min, Z_max, R_min

3.00 8.00 8.50 ! T_Thickness(Rmax), Z_Thickness, R_Thickness(Rmin)

430.00 535.00 70.00 60.00 ! Tecma1, Tecma2, Secma1, Secma2

290.00 10.00 8.00 0.00 ! Stay Tube : T_Position, Radius, D_Radius, D_Phi

9 ! Nectu

MuonAGDD Package Extend AGDD language for detector

specific elements

Detector SpecificAGDD

GenericAGDD

C++ interface

expand() method

Applications

Compact XML 

<compact name="ENC_CRYO_STAYTUBE">

<ENC_Cryostat_StayTube T_Position="2900.0" Radius="100.0"

D_Radius="80.0" D_Phi="0.0" Nectu="9"

unit_length="mm" />

</compact>

<compact name="ENC_CRYO">

<ENC_Cryostat T_Thickness="30.0" Z_Thickness="80.0" R_Thickness="85.0"

Tecma1="4300.0" Tecma2="5350.0" Secma1="700.0" Secma2="600.0"

StayTube_Desc="ENC_CRYO_STAYTUBE"

unit_length="mm" />

</compact>

C++ interfacevoid ENC_Cryostat::get_attributes(){ AGDD* agdd; agdd = AGDD_Factory::Xerces_instance().get_detector_description(); m_z_thickness = getDoubleAttValue("Z_Thickness"); m_t_thickness = getDoubleAttValue("T_Thickness"); m_r_thickness = getDoubleAttValue("R_Thickness"); m_out_rad1 = getDoubleAttValue("Tecma1"); m_out_rad2 = getDoubleAttValue("Tecma2"); m_out_segm1 = getDoubleAttValue("Secma1"); m_out_segm2 = getDoubleAttValue("Secma2"); m_unit_length = getDoubleAttValue("unit_length");

m_cryostat_staytube = dynamic_cast<ENC_Cryostat_StayTube*>( getCompactAttValue("StayTube_Desc", agdd)); assert(m_cryostat_staytube);

cout <<"Finished getting Cryostat attributes!" << endl; }

expand( ) methodvoid ENC_Toroid::expandCryostat(double Tor_Length,double Tor_Inner_Radius){ cout << "Expanding the Cryostat--" << endl; . . AGDD_Tube* Inner_tube = new AGDD_Tube; m_expandedVolumes.push_back(Inner_tube); Inner_tube->setName("ENC_CRYO_Inner_tube"); Inner_tube->m_total_length = Tor_Length - 2*Cryostat()->Z_Thickness(); Inner_tube->m_inner_radius = Tor_Inner_Radius; Inner_tube->m_outer_radius = Tor_Inner_Radius + Cryostat()->R_Thickness(); Inner_tube->m_starting_angle = -2*Cryostat()->alpha2(); Inner_tube->m_angle = 45; Inner_tube->m_material_name = "Aluminum";

AGDD_Tube* Stay_tube = new AGDD_Tube; m_expandedVolumes.push_back(Stay_tube); Stay_tube->setName("ENC_CRYO_Stay_tube"); Stay_tube->m_total_length = Tor_Length - 2*Cryostat()->Z_Thickness(); Stay_tube->m_inner_radius = Cryostat()->Cryostat_StayTube()->Inner_Rad() ……… Stay_tube->m_outer_radius = Cryostat()->Cryostat_StayTube()->Outer_Rad() …….. Stay_tube->m_material_name = "Aluminum";

Expanded XML <tubs name="ENC_CRYO_Inner_tube" material="Aluminum" Rio_Z="905 990 4840"

profile="-26.5078 45" />

<tubs name="ENC_CRYO_Stay_tube" material="Aluminum" Rio_Z="104.433 130.541 4840" />

.

.

.

.

<composition name="ENC_CRYO" >

<posXYZ volume="ENC_CRYO_Inner_tube" />

<posRPhiZ volume="ENC_CRYO_Stay_tube" R_Phi_Z="2900 9.24611 0" />

<posXYZ volume="ENC_CRYO_Outer_surf" />

<posXYZ volume="ENC_CRYO_Side" />

</composition>

ATLAS Barrel Toroid

ATLAS Endcap Toroid

ATLAS Feet