Work progress in Budapest

A. Agocs, K. Krajczar, B. Radics, F. Sikler and G. Vesztergombi

Hamburg, 30-31 May 2011

Mille/Pede database

Software version: CMSSW_4_1_4patch2_IOVpatchDatasets:/afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/ datasetfiles/Collisions2010/38xReprocessing/allMinBias.txt,/afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/ datasetfiles/Cosmics2010/Run2010A_allCosmicsDuringCollisions.txt,/afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/ datasetfiles/Cosmics2010/Commissioning10v5_v8_allCosmicsDuringCollisions.txt,/afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/ datasetfiles/Cosmics2010/CRAFT10_allruns.txtGiven database: /afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/mp0643/alignments_MP.db

Offline Validation

Start Geometry: /afs/cern.ch/cms/CAF/CMSALCA/ALCA_TRACKERALIGN/MP/MPproduction/mp0643/alignments_MP.dbSoftware version: CMSSW_3_11_0Global Tag: GR_R_311_V1::All

Calculated Geometry Vs. IDEAL 1

Pixel detector

Calculated Geometry Vs. IDEAL 2

Tracker Inner Barrel

Calculated Geometry Vs. IDEAL 3

Tracker Outer Barrel

//indico.cern.ch/getFile.py/access?contribId=1&sessionId=2&resId=0&materialId=slides&confId=36394

//indico.cern.ch/getFile.py/access?contribId=1&sessionId=2&resId=0&materialId=slides&confId=36394

OVERLAPPING IDEAS

Experimental FACT:

In Barel PIXEL some tracks have 2 hits in the SAME Layer

In Forward PIXEL some tracks have 2 hits in the SAME Disk

FPix # of tracks: 54368FPix # of selected tracks: 2795, 5.14089 %

Points from all tracks in Layer 1 Only points from tracks in overlap regionBPix Layer 1 # of tracks: 280282 Layer 1 # of selected tracks: 8329, 2.97165 %

Points from all tracks in Layer #1 Only points from tracks in overlap region

Piecewise Alignment by OVERLAPPING tracks

Simplified ONE-dimensional case

z1 z2 z3

+/- dz +/-dz +/-dz

Overlappingmodules

No magnetic field: (m,b) track fitted from the other planes: x = m *z + b

xj

xj+1

Assumption : distortion is occuring only in x-direction:

j-th module is shifted by „sj”

xjmeas + sj = xfitted = m (z1-dz) + b

xj+1meas + sj+1 = xfitted = m (z1+dz) + b

By subtraction one gets a recursive formule :

sj+1 = sj + xjmeas – xj+1

meas (+/-) 2 * m * dz

The sign depends on the parity of „j”

For many tracks one can get with small error the expected value: <sj+1 - sj >

ALL the PLANE becomes a RIGID body with single „s1” free parameter

The recursive procedure for fitting relative position of module „j” with respect to module „j+1” can be generalized for 3-dimensional case.

In Barrel one obtains wheels with one free ladder module

In Forward one obtains disks with one free blade module

One should repeat the procedure with the new alignment parameters to get consistent fitted parmeters.

Overall fit can be performed on larger objects with drastically reduced number of parameters with much less freedom for twists and other criminalities.

Ideal tool for CROSS-CHECK of existing fitting procedures

Local relative shift calculation is in first order independent from „xfitted” calculation, because

| zi – zj | >> dz thus „m” is not a sensitive parameter

In case of 3-dim the actual „dz” will depend on the shift parameter,therefore one should solve the equation explicitely.

Track selection:

- Multiple-scattering is not critical if „dz” is small -> low momentum allowed

- Hadron tracks as good as muons

- Question of cluster size dependence, crossing angle studies

- Include vertex for RIGID body alignments

END

Run: 160835Dataset: Minimum Bias

BPix Layer 1 track: van legalabb 1 valid RecHituk a BPix Layer 1-en    if(module_on_det == 0 && module_on_layer == 1 && traj_validhit == 1 && track_validbpix[0] > 0 ){

BPix Layer 1 selected tracks: BPix Layer 1 tracks, plussz pontosan2 valid hituk van a BPix Layer 1-en, es a 2 hit egyazon ladder ket szomszedos modulejabol, vagy ugyanolyan module ket szomszed ladderen legyen.

if(track_validbpix[0] == 2 && ((cladder == pladder && fabs(cmodule - pmodule) == 1 && ctrackpt == ptrackpt) || (cladder == nladder && fabs(cmodule - nmodule) == 1 && ctrackpt == ntrackpt) || (cmodule == pmodule && fabs(cladder - pladder) == 1 && ctrackpt == ptrackpt)|| (cmodule == nmodule && fabs(cladder - nladder) == 1 && ctrackpt == ntrackpt)) ){

BPix Layer 1 # of tracks: 280282BPix Layer 1 # of selected tracks: 8329, 2.97165 %------------------------------------------------

------------------------------------------------FPix Disk 1 tracks:

 if(module_on_det == 1 && module_on_disk == 1 && traj_validhit == 1        && track_validfpix[0] > 0 ){

FPix Disk 1 selected tracks: hasonlo mint BPix, csak nem module/ladderhanem blade szelekcio

   if(track_validfpix[0] == 2 && ((fabs(cblade - pblade) == 1 &&ctrackpt == ptrackpt) || (fabs(cblade - nblade) == 1 && ctrackpt == ntrackpt))){

FPix # of tracks: 54368FPix # of selected tracks: 2795, 5.14089 %

CMSSW version 4.1.2Trigger: L1 trigger selection for "good collision"

"L1SeedsLogicalExpression = cms.string('(40 OR 41) AND ( NOT 36)AND ( NOT 37)AND ( NOT 38) AND ( NOT 39) AND 0 AND ( ( 42 AND 43) OR ( NOT 42\AND ( NOT 43) ) )')"