ZDC Offline Status Report

ZDC Offline Status ReportC. Oppedisano

dN

/dN

ZN

C

ZNC signal (ADC ch.)

dN

/dN

ZPC

ZPC signal (ADC ch.)

dN

/dN

ZN

A

ZNA signal (ADC ch.)

dN

/dN

ZPA

ZPAsignal (ADC ch.)

ZNC

ZNA

yZ

NC (

cm)

yZ

NA (

cm)

xZNC (cm)

xZNA (cm)

Open issues from March AOW

2CERN, ALICE Offline Week, 5 July 2010C. Oppedisano

Some DCS DPs were not found by the Shuttle problem solved thanks to P. Chochula’s help from DCS side (some DCS DP didn’t have the corresponding alias assignment) and to M. Gagliardi on ZDC side (bug in the script that forced DP value writing) all the DPs are found by the Shuttle!

ZPA spectra were not reproduced by MC due to not correct tracking in the A side compensator field: GEANT step size was too large and charged particles were not affected by the 1st compensator field Andreas and Andrei updated AliPIPEv3 code correct tracking from rev. 39872

3C. Oppedisano

900 GeV data vs. MC with bugDATA

PMT1 signal (ADC ch.) PMT2 signal (ADC ch.) PMT3 signal (ADC ch.) PMT4 signal (ADC ch.)PMTC signal (ADC ch.)

1/N

entr

ies

*dN

/dN

ZN

AC

1/N

en

trie

s *

dN

/dN

ZN

A1

1/N

entr

ies

* d

N/d

NZ

NA

2

1/N

entr

ies

* d

N/d

NZ

NA

3

1/N

en

trie

s *

dN

/dN

NPA

4


1/N

entr

ies

*dN

/dN

ZN

AC

1/N

en

trie

s *

dN

/dN

ZN

A1

1/N

en

trie

s *

dN

/dN

ZN

A2

1/N

entr

ies

* d

N/d

NZ

NA

3

1/N

en

trie

s *

dN

/dN

NPA

4

MC

CERN, ALICE Offline Week, 5 July 2010

4C. Oppedisano

900 GeV data vs. MC with correct trackingDATA

MC


1/N

entr

ies

*dN

/dN

ZN

AC

1/N

entr

ies

* d

N/d

NZ

NA

1

1/N

en

trie

s *

dN

/dN

ZN

A2

1/N

entr

ies

* dN

/dN

ZN

A3

1/N

en

trie

s *

dN

/dN

NPA

4


1/N

entr

ies

*dN

/dN

ZN

AC

1/N

en

trie

s *

dN

/dN

ZN

A1

1/N

en

trie

s *

dN

/dN

ZN

A2

1/N

entr

ies

* d

N/d

NZ

NA

3

1/N

en

trie

s *

dN

/dN

NPA

4

CERN, ALICE Offline Week, 5 July 2010

GEOMETRY


Vertical collimator jawsJaw apertures and center can be set at config level independently for side A and side C collimators. The implementation calculates the jaw dimensions in order not to have overlaps with the elliptical beam pipe present in the collimator region.Setters to be used in Config.C:

SetVCollSideCAperture(value); SetVCollSideCCentre(value);SetVCollSideAAperture(value); SetVCollSideACentre(value);

Hadronic calorimeter vertical positionsThe detector vertical position can be set in config file for the 4 hadronic calorimeters.Setters that can be used in Config.C:

SetYZNC(value)SetYZPC(value);SetYZNA(value);SetYZPA(value);

Media cuts moved to galice.cuts

SIMULATION


Possibility to generate with crossing angle

The possibility to generate with a not null crossing angle has been introduced for PYTHIA6 (from rev. 40865) by G. Luparello, she is currently working on adding the feature also to PHOJET.

ZNA

Dipole OFF

Dipole ON

900 GeV data

ZDC response for neutral particle is affected by the ALICE dimuon dipole settings since it produces an internal crossing angle ZN vertical positions were not changed during 900 GeV data taking

RAW DATA


AliZDCRawStream class has been consistently updated in order to decode data from the (ZDC + ADD) TDCs

Modules decoded by ZDC streaming raw class:

4 ADCs 1 TDC 1 VME scaler ZDC trigger card

1 ADC 1 TDC ADD

Pb-Pb SIMULATION @ 1.38+1.38 A TeV


The simulation were tuned for Pb-Pb @ 2.76+2.76 A TeV changes to adjust simulation and reconstruction for the coming HI run:

SIMULATION PMT gains rescaled according to beam energy AliZDCDigitizer spectator nucleon signal stored in folders according to beam energy SpectatorSignal.root at digitization time spectator signal is chosen accordingly to beam energy

Spectator signal sample @ 1.38 A TeV


ZNC

ZPC



RECONSTRUCTION Glauber MC run at the foreseen energy to generate b and Npart distributions used in ZDC reconstruction, inelastic NN x-sec. value updated sNN = 60 mb GlauberMCDist.root



b (fm)

b (fm)

Npart

Npart

dN/N

part

dN/N

part

dN/d

bdN

/db

Pb-Pb @ 1.38+1.38 A TeV

Pb-Pb @ 2.76+2.76 A TeV

QA


Implementation of reference data Late in planning tool + Savannah bug 69378 currently working on the item

Raw QA histos for DQM

10 histos: ZEM1 and ZEM2 spectra PMC for the 4 hadronic ZDCs Sum(PMQi) vs. PMC for the 4 hadronic calorimeters

Request to port changes to the release Savannah bug 69246

ZEM1 ZEM2

ZNC ZNA ZPC

ZPA

ZNC

ZNA ZPC ZPA

ZPA

Night problems


In the Shuttle night test setup the ZDC preprocessor fails from July the 2nd

AliZDCPreprocessor code has not been changed from rev. 40501 of April the 19th

For all the run types the error is the same:

I-TAlienFile::Open: Accessing image 1 of alien:///alice/testdata/2010/OCDB/ZDC/Calib/ChMap/Run43645_999999999_v9_s0.root?filetype=raw&cachesz=4000000&readaheadsz=2000000&rmpolicy=1 in SE <ALICE::CERN::SE>E-TXNetFile::CreateXClient: open attempt failed on alien:///alice/testdata/2010/OCDB/ZDC/Calib/ChMap/Run43645_999999999_v9_s0.root?filetype=raw&cachesz=4000000&readaheadsz=2000000&rmpolicy=1&mkpath=1E-TAlienFile::Open: No more images to try - giving upE-TFile::Cp: cannot open source file /alien/alice/testdata/2010/OCDB/ZDC/Calib/ChMap/Run43645_999999999_v9_s0.root

The problem should be in accessing the file /alice/testdata/2010/OCDB/ZDC/Calib/ChMap/Run43645_999999999_v9_s0.root(idea shared by Chiara Z.)

Macros to check calibration data (I)


plotPedestalvsTime.C pedestal mean values trend vs. run numberZP

A

ZN

A

ZPC

ZN

C

Macros to check calibration data (II)


checkPedestalHistos.C to check pedestal histos and the fit performed by the DA

ZNA

ZPA

checkLaserHistos.C to check LASER run histos and the fit performed by the DA checkAlienZDCESD.C to check ESD

…and some more are all in the ZDC directory

Documents

ZDC Offline Status Report