TOF: ONLINE CALIBRATION NEWS

AND SOMETHING MORE

Chiara Zampolli for the ALICE-TOF

TOF Online Calibration – Principle

TOF online calibration procedure is aimed at defining the status and a rough estimation of the delay in time measurement of each TOF channel.TOF online calibration is performed on three different sources:

PHYSICS runs ↔ TOFda, DAQ, MONPULSER runs ↔ TOFpulserda, DAQ, LDCNOISE runs ↔ TOFnoiseda, DAQ, LDC

with additional information coming from DCS:TOFFEE map, extracted every run ↔ DCS script

8th July 2008 Chiara Zampolli Offl Week - TOF

TOF Online Calibration – Strategy

At every end of PHYSICS/PULSER/NOISE run, the TOF preprocessor retrieves the output from the corresponding DA + the output from the DCS DA and processes the data → Preprocessors’ Phylosophy within the SHUTTLE frameworkThe status of the channel is defined processing the output of the TOFpulserda, TOFnoiseda and processing the FEE map coming from DCS......while the rough delays are determined on the basis of the output of the TOFda.The output is then stored in the OCDB, ready to be used in reconstruction.

8th July 2008 Chiara Zampolli

This is still valid, but the format of the TOF

calibration objects has been modified

Offl Week - TOF

How it was before.......for hystorical reasons....

Two main objects were implemented in AliRoot:AliTOFChannelOnline → to store delays: Float_tAliTOFChannelOnlineStatus → to store status(es): Char_t

embedded in TObjArrays to store calibration parameters.In total, 4 TObjArrays read in reconstruction (ӿ):

TObjArray(AliTOFChannelOnlineStatus): FEE statusTObjArray(AliTOFChannelOnlineStatus): Pulser statusTObjArray(AliTOFChannelOnlineStatus): Noise statusTObjArray(AliTOFChannelOnline): rough delay

(ӿ) only online calibration objs considered here

8th July 2008 Chiara Zampolli

Drawback:TObject overhead, to be multiplied by 157248 for

every TObjArrayOffl Week - TOF

...it was also like this...Every object was stored in a dedicated folder in the OCDB:

TOF/Calib/ParOnlineTOF/Calib/PulserTOF/Calib/NoiseTOF/Calib/FEE

each of which was accessed during reconstruction.

8th July 2008 Chiara Zampolli

AliTOFReconstructor::AliTOFReconstructor() : AliReconstructor(), fTOFcalib(0) {

// // ctor // //Retrieving the TOF calibration info fTOFcalib = new AliTOFcalib(); fTOFcalib->CreateCalArrays(); if(!fTOFcalib->ReadParOnlineFromCDB("TOF/Calib",-1))

{AliFatal("Exiting, no CDB object found!!!");exit(0);}

if(!fTOFcalib->ReadParOfflineFromCDB("TOF/Calib",-1)) {AliFatal("Exiting, no CDB object

found!!!");exit(0);}}

Offl Week - TOF

How it is now...

Two new objects implemented:AliTOFChannelOnlineArray → to store delays: Float_t*AliTOFChannelOnlineStatusArray → to store status: Char_t*

to store the calibration parameters in simpler arrays of basic types.During reconstruction, acces to 2 objects is done (ӿ)

AliTOFChannelOnlineArrayAliTOFChannelOnlineStatusArray

(ӿ) only online calibration objs considered here

8th July 2008 Chiara Zampolli Offl Week - TOF

...and it also like this...

Two new folders created in the OCDB:/TOF/Calib/ParOnlineDelay → containing the computed delays, embedded in the AliTOFChannelOnlineArray/TOF/Calib/Status → containing the status information combining all the sources (FEE, PULSER, NOISE), embedded in the AliTOFChannelOnlineStatusArray

8th July 2008 Chiara Zampolli

AliTOFReconstructor::AliTOFReconstructor() : AliReconstructor(), fTOFcalib(0) {

fTOFcalib = new AliTOFcalib(); fTOFcalib->CreateCalObjects(); if(!fTOFcalib->ReadParOnlineDelayFromCDB("TOF/Calib",-1))

{AliFatal("Exiting, no CDB object found!!!");exit(0);} if(!fTOFcalib->ReadParOnlineStatusFromCDB("TOF/Calib",-1))

{AliFatal("Exiting, no CDB object found!!!");exit(0);} if(!fTOFcalib->ReadParOfflineFromCDB("TOF/Calib",-1))

{AliFatal("Exiting, no CDB object found!!!");exit(0);} }

Offl Week - TOF

...and this.

An additional entry has been introduced in OCDB/TOF/Calib/Config: Tmap to configure preprocessor:

8th July 2008 Chiara Zampolli Offl Week - TOF

root [0] TFile *file = new TFile("$ALICE_ROOT/TOF/Calib/Config/Run0_999999999_v0_s0.root","READ")

root [1] AliCDBEntry *e = (AliCDBEntry*)file->Get("AliCDBEntry")root [2] TMap *m = (TMap*) e->GetObject()root [3] m->Print()Key: TObjString = IntegralThrValue: TObjString = 100Key: TObjString = ComputingDelaysValue: TObjString = kFALSEKey: TObjString = ThrParValue: TObjString = 0.013Key: TObjString = StartingRunValue: TObjString = 0Key: TObjString = BinRangeAveValue: TObjString = 13root [4]

Cern, July 19, 2007 OFFLINE Weekly meeting

Managing the OCDB during reco

Run validity0 ∞1 2 3 54 101 102 103 104100

Onlin

eOffl

ine

Run 01234

100101102103104

Run 01234

100101102103104

Reset!Offline Calib obj

no more valid

Not valid

Not valid

Valid

Valid

Offline Calib obj validOffline Calib obj not validOffline Calib

obj valid

Alberto, Jan Fiete

from Offl Week, Oct ‘07

Updating the Channel Status – How?

Channel status is stored in a Char_t → 8 bits:X X X X X X X X

8th July 2008 Chiara Zampolli Offl Week - TOF

spareNOISE PULSE

R

FEE

First, update of the FEE bits, if different from what was previously stored – N.B.: OCDB obj validity = [current_run, AliCDBRunRange::Infinity()] Object stored in /TOF/Calib/Status only in case of PHYSICS runs, otherwise, waiting for PULSER/NOISE bits to be updated, first.FEE status is checked both before computing delays in PHYSICS runs, and before updating PULSER/NOISE bits

TOF Preprocessor Flow

8th July 2008 Chiara Zampolli Offl Week - TOF

1 channel FEE st != previous?

Retrieval of previosly stored Status entry (if any)

yes noupdate = kTRUE update = kFALSE

PHYSICS NOISEPULSER

if (update) store status in OCDB

/TOF/CALIB/Statuswait to

store in OCDB

RUN TYPE

process DAQ PHYSICS data according to Config Tmap

(TOFda)

process DAQ PULSER data, update pulser bits

(TOFpulserda)

update FEE bits

store status in OCDB

/TOF/CALIB/Status

store delays in OCDB

/TOF/CALIB/ParOnlineDelay

wait tostore in OCDB

process DAQ NOISE data, update noise bits

(TOFnoiseda)

store status in OCDB

/TOF/CALIB/Status

ProcessFEEData

ProcessOnlineDelay

ProcessPulserData

ProcessNoiseData

TOF Trigger at P2 – BACKtoBACKE. Scapparone, Physics Forum, 2nd July 2008

TOF Trigger at P2 – TOFforTRDE. Scapparone, Physics Forum, 2nd July 2008

TOF Trigger at P2 – TOFforHMPIDE. Scapparone, Physics Forum, 2nd July 2008

TOF Preprocessor at P2 – some numbers

From run 36356 (“Mon, 09 Jun 2008 06:23:01 GMT”):424 runs in SHUTTLE logbook (“DONE”+”FAILED”) 33 runs successfully processed by SHUTTLE (either PHYSICS or PULSER) 128 failed runs (DAs missing, mainly, FEE file not copied to the DCS FXS at the beginning)263 STANDALONE/COSMICS runs → not processed by SHUTTLE, but set as DONE180 files in the DAQ FXS319 files in the DCS FXS

Many runs with 0 or very few values for DPs → to be checked with DCS experts whether “bonus value” storing has been implemented.

8th July 2008 Chiara Zampolli Offl Week - TOF

NB: so far, no calibration performed

TOF QA – Reference Data

Reference data created, and used in the TOFQAChecker

8th July 2008 Chiara Zampolli Offl Week - TOF

if (fRefSubDir) { // should not be needed anymore!!! AliInfo("Found a histo in the reference in the subdir!"); href = static_cast<TH1*>(fRefSubDir->Get(hdata->GetName())) ; } else if (fRefOCDBSubDir) { AliInfo("Found a histo in the reference in the OCDB!"); href = static_cast<TH1*>(fRefOCDBSubDir->FindObject(hdata->GetName())); }...Double_t rv=0; If (hdata->GetEntries()>=href->GetEntries())

{ rv=1; }AliInfo(Form("%s -> %f", hdata->GetName(), rv)) ;test += rv ;count++ ;...return test/count;

TOF QA – Reference Data

A macro to build reference data for Hits/Digits/Sdigits/RAW/RecPoints/ESD writtenSo far, just empty histograms, trivial solution waiting for reasonable reference dataCode not yet committed:

Run-type folders for reference data?PULSER/NOISE runs won’t be reconstructed – will they go through the QA, anyway?

8th July 2008 Chiara Zampolli Offl Week - TOF

AliTOFRecoParam

Inheritance from AliDetectorRecoParam implemented, to be committed after cross-checking with PH on its backward compatibilty – should be OK

8th July 2008 Chiara Zampolli Offl Week - TOF

Summary

TOF Online Calibration objects changedBackward compatibilty guaranteed by creation of new folders for the new objectsTOF preprocessor @ P2 validated in the whole chain, not running often thoughQA framework almost completed – just minor details to be definedAliTOFRecoParam in place, to be committed soon.

8th July 2008 Chiara Zampolli Offl Week - TOF