1. 1 Atlas Software Identifiers Useful places on the web: http://atlas-sw.cern.ch/cgi-bin/viewcvs-atlas.cgi/offline/Calorimeter/CaloIdentifier LAr Software Identifiers ( VERY useful ! ) : http://lpsc.in2p3.fr/atlas/lucotte/3.SOFTWARE/software_online.html M.Lelchouk’s dead material identifier proposal http://www.nevis.columbia.edu/~lelchuk/DeadMaterials/version_1.8.txt

2. 2 Identifier in Atlas… : Each identifier has several parts: Detector / sub-det. / type / sampling / region / eta / phi Detector: 2 – Indet 4 - LAr 5 - Tile 7 – Muon 10 - Calorimeter Sub-Detector for LArID (=4): 1 – LArEM 2 - LArHEC 3 - LArFCAL 4 – LArOnline -1 – LArEMdisc -2 - LArHECdisc -3 – LArFCAL (See LAr Software ID web-page)

3. 3 Sub-Det. for CaloLVL1 (=10): +/-1 – Detector side Type: 0 - EM 1 - Had Sub-Detector for CaloCell (=10): 0 – EM 1 – HEC 2 - FCAL 3 – Tile 4 – NSubcalo Z-side(type): +/- 1 Dead-Materials Sub-Detector for CaloDM (=10): +/-1 – LVL1 Trig Towers +/-4 – LAr Dead Material +/-5 – Tile Dead Material sign of Identifier Z-side : “+” indicates side A “-” indicates side C

4. 4 Samplings for CaloCell Subdetectors (10 ; +/- 1 ): enum CaloSample { PreSamplerB=0, EMB1, EMB2, EMB3, // LAr barrel PreSamplerE, EME1, EME2, EME3, // LAr EM endcap HEC0, HEC1, HEC2, HEC3, // Hadronic end cap cal. TileBar0, TileBar1, TileBar2, // Tile barrel TileGap1, TileGap2, TileGap3, // Tile gap (ITC & scint) TileExt0, TileExt1, TileExt2, // Tile extended barrel FCAL0, FCAL1, FCAL2, // Forward EM endcap Unknown }; 0,1,2,3 4,5,6,7 8,9,10,11 12,13,14 15,16,17 18,19,20 21,22,23 24

5. 5 Example: (lines are from “online Compact+expanded ID) Compact ID= 1002864384 OnlineID= [4.4.1.1.24.13.127] OfflineID= [4.1.2.2.1.38.255] connected (EM Endcap) Compact ID= 998413056 OnlineID= [4.4.1.1.16.6.19] OfflineID= [4.-2.2.3.0.1.40] disconnected (HEC) Online Offline: 4 = LAr 4 = LAr 4 = LArOnline 1 = LArEM 1 = EC 2 = Endcap Outer 1 = +Z 2 = 2 nd Sampling 24 = EC FT# 1 = EC outer samp. 2, reg.1 13 = FT slot 38 = reg.1,eta(2.375-2.4) 127 = FT channel 255 = phi(6.258-6.283) (!) Online Offline: 4 = LAr 4 = LAr 4 = LArOnline -2 = LArHECdisc 1 = EC 2 = +Z (A-side) 1 = +Z 3 = second wheel 16 = EC FT# 0 = outer part 6 = FT slot 1 = region.0, sampl.3, eta(1.6-1.7) 19 = FT channel 40 = phi (4.0-4.1)