Track based alignment for CMS Tracker modules T

Track based alignment for CMS Tracker modules T. Lampén, V. Karimäki An earlier related task: update of misalignment simulation scenarios of CMS. Essential tool for realistic physics analyses for first data. (CMS NOTE-2008/029) Application activities of the H. I. P. alignment algorithm lately: CRAFT/CRUZET exercises has been applied together with the Millepede algorithm to produce a combined set of alignment constants Many CMS groups actively using the H. I. P. alignment algorithm: Johns Hopkins Fermilab INFN Strong cooperation between different groups! The ‘Millepede’ alignment algorithm is also actively used in CMS. The HIP algorithm is computationally simple, and it has the most robust approach. Algorithms have earlier been used separately, but lately their results have been combined. SAB 25. 05. 2009 Jorma Tuominiemi 1

Ongoing work Extension of HIP algorithm for pixel alignment implementation of a dedicate, unbiased vertex constraint for pixel alignment stand-alone version ready as proof-ofconcept, implementation to CMSSW follows possible use: min. bias events (autumn 2009) Benefits of vertex constraint strong constraint, several tracks allow accurate measurement connects tracks -> beneficial for alignment of different parts of CMS useful for especially minimum bias events Non-planarity study of wafers SAB 25. 05. 2009 Jorma Tuominiemi 2

Test beam data analysis participation to Si. BT 2008 beam tests, in cooperation with the Tracker project M. Kortelainen, T. Lampén Principal responsibilities: provision of online monitoring tools with quick 5 min. response time (essential during the 4 -day test beam period), and SW development for consequent offline data analysis Details of offline analysis published in NIMA in 2009, several publications from 2008 data in process Ongoing: update of offline data analysis SW for 2009 data analysis (CMSSW 1. 7. 7 -> 3. 1. X) SAB 25. 05. 2009 Jorma Tuominiemi 3