1. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 1 Status of Barrel Crosstalk Analysis 2 definitions : Peak-to-peak : V'max/Vmax Under the peak : V'(Tmax)/Vmax where Vmax=V(Tmax)‏ Short distance crosstalk Capacitive : Strip-strip : analysis presented at February LarWeek and March BP3C meeting Resistive Middle-Strip Inductive Middle-Middle / Middle-Back / Back-Back http:/lpsc.in2p3.fr/atlas/labbe/BP3C/Xtalk/ Pulsed strip Neighbour strip

2. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 2 Reminder of Strip-Strip crosstalk analysis Run 8045 (HIGH Crates I10, I12, I13, I14, H04, H05, H13,H14, H15)‏ Results in good agreement with October '01 Test Beam (Module 10)‏ = 7.14 % (4.17 %) with peak-peak (under the peak) definition = 0.79 % (0.26 %)‏ Pathological channels observed See http://lpsc.in2p3.fr/atlas/labbe/BP3C/Xtalk/pathology.phphttp://lpsc.in2p3.fr/atlas/labbe/BP3C/Xtalk/pathology.php Good uniformity along phi : eg. (phi rms)/(phi average)‏ Strip->Neighbour Strip (Peak-Peak def)‏ Strip->Next to Neighbour Strip (Peak-Peak def)‏

3. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 3 ADC to MeV conversion All results here are with amplitudes in MeV For comparison with previous analyses (Many thanks to Fabrice Hubaut)‏ And because MeV are the physical quantities. Gain factors for amplitude conversion from ADC to MeV are provided by ADC2MeVTool (with the help of Guillaume Unal)‏ This software modification is fully compatible with previous jobOptions. Ratio of gain factors (from ATL- LARG-200-007)‏

4. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 4 Resistive crosstalk : Middle to Strip Resistive crosstalk : Peak-to-Peak and Under- the-Peak definitions are equivalent Here Peak-Peak definition used But Middle to strip crosstalk not purely resistive. Previous analyses substract the long distance crosstalk I estimate correction factors for comparison Run 8045 Barrel C

5. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 5 Inductive crosstalk : Middle to Middle Run 8045 Barrel C

6. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 6 Inductive crosstalk : Middle to Back Run 8045 Barrel C

7. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 7 Inductive crosstalk : Back to Back Run 8045 Barrel C

8. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 8 Inductive crosstalk : Summary Good agreement with peak-peak crosstalk definition Some differences with Under the Peak definition, but so far a fixed value is used for Tmax Software improvement will come

9. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 9 Pathological channels Run 8045 (HIGH Crates I10, I12, I13, I14, H04, H05, H13,H14, H15)‏ Barrel C H5R, M0 (FT7, Slot 11) – chan 1,3,8,10,17,19,24,26 Problem with a calibration line ? Already seen by Guillaume H13L, M2 (FT24, Slot 13) – chan 82 Get amplitude of ~20 ADC when pulsed, but its crosstalk is normal Already seen by Lydia H13R, B0 (FT23, Slot 9) – chan 72 No signal, even when not pulsed Already seen by Lydia and Guillaume Barrel A I12L (FT22) Important crosstalk (~15%) between M3 chan 55 and B1 chan 107 Even when none of the two is pulsed Chan 82 pulsed Chan 72, ieta =2 Chan 64, ieta =0 Chan 68, ieta =1 pulsed The middle cell The back cell The middle cell (pulsed)‏ The back cell

10. Julien Labbé - Status of Barrel Crosstalk Analysis - Barrel P3C meeting, Thursday May 3rd 2007 10 Conclusion Summary : Crosstalk analysis complete for the run 8045 (9 Crates)‏ Capacitive : Strip to Neighbour and Strip to Next to Neighbour Resistive : Middle to Strip Inductive : Middle and Back layers Software improvement : Implementation of peak detection I will see this with Renat (Endcap)‏ Preparation of the full barrel analysis I added a cut on the wave reconstruction to minimize the used memory.