1 June 29, 2004, SCT Week SCT Simulation for CTB2004 Zdenka Broklova, Peter Kodys, Carlos Escobar Special thanks to Thijs Cornelissen, Grant Gorfine, Pavel Nevski, Pavel Reznicek, Sasha Rozanov, Manuel Gallas, Vakho Tsulaia and many others for their help. Status and results are summarized on

2 June 29, 2004, SCT Week Overview SCT layout for CTB and explanation of coordinate systems Implementation in Athena SCT_TestBemDetDescr package - latest SCT settings (in NOVA 8.3.0) - position and/or position corrections can come from external file

3 June 29, 2004, SCT Week Checking geometry I. comparison with Peter Kodys ROOT-based macro module in the center of SCT box and particle beam (along x axe) was perpendicular to module using Gauss profile source of 5000 pions (180 GeV), width 80  m 15 points on strips for both sides of each module = 5 strips using 3 points on each of them (10%, 50% and 90% of effective strip length), all ends of these strips were checked as well Example: Outer module, top side, strip 192, 50% of length

4 June 29, 2004, SCT Week Checking geometry II. strip values are converted into  m using average pitch value 80  m bigger error occurs for strip ends, where the statistics is lower because about half of number of particle was not detected by strips and the position of strip ends is known less precise (gartering ring influence, edge effects, … not included in Peter’s macro) all checked strips are in proper position (with precision about 1  m) Histograms of differencies between expected and found strip positions

5 June 29, 2004, SCT Week Checking geometry III. particles were shot along the strip line with step 5  m, the precision including error from line equation calculation is about 10  m along the strip and 5  m in direction perpendicular to the strips insensitive margin around sensor as well as gap between both sensors has correct size

6 June 29, 2004, SCT Week Strip numbering Front electronics strip numbering follows these rules: sum of strip numbers which are crossed by perpendicular particals should be always near 767 on both module sides, master chip is always positioned on left side of the hybrid (if you look from hybrid to sensors, in pictures there is a small arrow labelling it) and there is the strip number 0 on this edge of the sensor Offline software strip numbering follow these rules: strip numbers increase with  coordinate (on all types of modules and both sensors) top side of module (with connectors in hybrid) is marked 1, back side is side 0 there is no difference between top and bottom side of modules in offline software sometimes offline and electronics numbering of the strips on the same module side is inverted by formula StrNo_offline = 767 – StrNo_electronics byte convertor provides the conversion from front electronics strip numbering to offline conventions

7 June 29, 2004, SCT Week Energy losses average energy losses of 50 GeV mions outer module + 10 cm of air

8 June 29, 2004, SCT Week Future plans