Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Software Prototype – recent updates Pawel Brückman de Renstrom Just a few observations.

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Presentation transcript:

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Software Prototype – recent updates Pawel Brückman de Renstrom Just a few observations No real work done since last meeting Verification of derivatives tedious – subtle effects seem to play role! The proof-of-principle exercise will not be conclusive unless we start using the “exact” derivatives ID Alignment Meeting University of Oxford 07/10/03

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom  Potential problem pointed out during last meeting: strangely mixed modes???  Just an artefact of inversed tilt angles in the display program: beforeafter No indication for mixed modes any more!

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom  Switch to the latest ntuples from DC1 including exact Z information for extrapolations to the SCT  Reminder: I could not observe “low modes” corresponding to global rotations around X & Y on the old ntuples.  Reason: derivatives v.r.t. local in-plane rotations of modules are proportional to local_y!  New ntuples perfectly cure the problem – just as expected! NOTE: The DC1 multimu ntuple has over twice smaller statistics than the old one – larger fluctuations observed

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Reminder: “lowest modes” in PIX+SCT as reconstructed from the old ntuples

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Mode # eigenvalue PIX+SCT Ring, no VTX (DC1 ntuple: 23kev)

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Mode # eigenvalue PIX+SCT Ring, no VTX (DC1 ntuple: 23kev)

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Mode # eigenvalue PIX+SCT Ring, VTX fit (DC1 ntuple: 23kev) NOTE: now three translations are distinct. The reason being the direct numerical matching of the derivatives (de/db  de/da) for translations

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom Mode # eigenvalue PIX+SCT Ring, VTX fit (DC1 ntuple: 23kev)

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom  So I was happy and relaxed untill…  BUT… wait a moment. There should NOT be 6 exact degeneracies of the system!  B field has a direction: It simply shouldn’t work! B

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom  And I realised that the “SUPERsymmetry” I obtain was due to oversimplified calculation of de/dcot . It didn’t correctly treat hits further down the helix.  After correction…  …again everything as expected!

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom PIX+SCT Ring, no VTX (DC1 ntuple: 23kev) Mode # eigenvalue de/dcot  corrected!

Oxford 09 October 2003 ID Alignment Meeting Pawel Brückman de Renstrom PIX+SCT Ring, no VTX (DC1 ntuple: 23kev) Mode # eigenvalue de/dcot  corrected!