ACORDE Status ReportDetectors Status – Alice Offline WeekJune 22th 2009

Mario Rodríguez Cahuantzi FCFM - BUAP, Puebla, Méxicoon behalf the ACORDE Mexican Group

2 Alice Offline Week June 2009 MRC – Detector Status

• Alignment• Calibration.• Geometry • Summary.

Outline

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Alignment

To align the ACORDE modules we use the propagation of the ESD – Tracks.

Two options for this task:

• Accelerator data. • Cosmic data.

Let’s see ….

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Alignment: accelerator data

The spectra is dominated by low energy muons.

pp collisions at 900 GeV

pp collisions at 14 TeV

E. Cuautle

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Alignment: accelerator data

Scattering distributionapproximately a Gaussian

,for

For iron, λ = 1.20 cms, so that, for 3 GeV muons, θ = 11.1mrad in 10 cms of material.

Not acceptable for modules which are 20 cms wide!!!

M. Sengupta, P.K. Sarkar, V.A. Kudryavtsev, Nucl. Instr. and  Meth. A, 2009

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Around the 10% of triggers ACORDE has at least one track reconstructed.

Alignment

The 67.21% of this events are useful to calibrate the modules of ACORDE.

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Alignment: cosmic data

We can not align ACORDE with accelerator data. So we do it with cosmic data.

The 50 mts of molase over the detector stops low energy muons allowing those with an energy above 15 GeV.

It is made:1.- Propagate to ACORDE the Tracks reconstructed as muons.2.- See the ACORDE’s activity per module, in X and Z direction.3.- Make a gaussian aproximation in X and Z direction looking for the center of each module.4.- Redefine the Geometry with the values of step 3.

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Alignment: cosmic data

Propagation of tracks to ACORDE modules. Run 62107.

The center of the module 0_0 should be at (2.69,3.30)

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Alignment: cosmic data

After the alignment we found a better behavior for the fitting of both distribution over Z and X direction in ACORDE’s modules.

To improve the results we can make a loop. We obtained: CenterModule0_0(0.81,1.13)

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Calibration: cosmic data

Using the propagation of ESD-tracks we calibrate the ACORDE modules.

Offline calibration procedure

1.Select only ACORDE triggers with at least one track reconstructed.2.Over the module iACORDEModule and the track propagated to ACORDE:

1.The efficiency of iACORDEModule =

(#Triggers iACORDEModule/#Tracks in iACORDEModule) * 100 %

if ( (!TrackPropagatedToiACORDEModule) && (FiredAcordeModule(iACORDEModule)) )

if ( (TrackPropagatedToiACORDEModule) && (FiredAcordeModule(iACORDEModule)) ){ Reconstruct the ACORDE’s Bitpattern # Triggers iACORDEModule Count how many tracks reached the iACORDEModule #Tracks in iACORDEModule}if ( (TrackPropagatedToiACORDEModule) && (!FiredAcordeModule(iACORDEModule)) ){ Count how many tracks reached the iACORDEModule->#Tracks in iACORDEModule}

We see the inefficiency of iACORDEModule

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Calibration: cosmic data

Efficiency of module 0_0 = 67.35 %

The global efficiency of ACORDE modules = 64%

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The efficiency estimated offline for ACORDE should be done after the alignment.

Calibration: cosmic data

During ACORDE cosmissioning the 92% of modules have been improved and calibrated. Now they are beeing testing at P2.

With the propagation of tracks done in the alignment, we calibrate offline the modules of ACORDE !!!

Shall we include this values and the alignt geometry in OCDB???Shall we include this proccess in AliAnalysisTask framework??

During the first cosmic runs we plan to implement this procedures, but we need the tracks reconstructed. Is it possible?

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Geometry

Due to several hardware changes in ACORDE modules and DCS the ID volumes have changed.

Also an upgrade of the survey is coming, as soon as finish it, the geometry will have changes (displacements) in AliRoot.

In the new survey we will have 3 points per module. Thus the alignment process will be extended.

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Summary

We don’t have calibration OnLine.

Updates are necessary in Shuttle coding running at P2.

ACORDE needs the information of TPC to align and calibrate. We don’t need to make an alignment per run, so we take the first cosmic runs to align and calibrate offline.

Bug (#50089) in SLC systems fixed for QAChecker.

Improve AliESDACORDE and AliQAChecker for the next cosmic data taking.

Migrate the MOOD code for ACORDE to AMORE.

Possible implementation of a cosmic ray shower generator.

Thanks for your time !!! Further comments about Acorde’s Offline tasks: Pedro Podesta <Pedro.Podesta@cern.ch>Arturo Fernandez <afernan@mail.cern.ch>