Reading Pedestal file in ALIROOT

1
Reading Pedestal file in ALIROOT

• Mriganka Mouli Mondal,VECC
• 50th PMD Collaboration Meeting,VECC

2

• Experience in Test Beam
• LDC(mostly pion data)
• GDC(all electron data some pion data)
• Data was taken in raw format
• It is converted to root format
• rootgtAlisimulation sim
• rootgtSim.ConvertDateToRoot(x
  .raw,x.root)
• Root files (Pedestal /Data) read by
• AliPMDRootDataRead.C

3

• //
• void AliPMDRootDataRead()
• // To read PMD raw root data and fetch the adc
  value for each cell
• TObjArray pmdddlcont
• Int_t ievt 2
• AliRawReaderRoot reader("grun643.001.raw.root",
  ievt)
• AliPMDRawStream stream(reader)
• Int_t indexDDL 0
• for (Int_t iddl 0 iddl lt 6 iddl)
• reader.Select("PMD", iddl, iddl)
• junk stream.DdlData(iddl,pmdddlcont)//id
  dl mriganka
• Int_t ientries pmdddlcont.GetEntries()
• for (Int_t ient 0 ient lt ientries
  ient)
• AliPMDddldata pmdddl (AliPMDddldata)pmdddlc
  ont.UncheckedAt(ient)

4

• Two step processes
• Pedestal file is read and first and mean and
  sigma calculated for each cell and the
  information were saved in a date file
• In the next step while reading the Data the date
  file is read to subtract pedestal

5

• In real run ?