AliRoot Core  ee782a0 (ee782a0)
MUON Shuttle

How to test the Shuttle preprocessor(s) for MUON.

We will get two "logical" MUON preprocessors : one for the tracker and one for the trigger. Both will manage several subtasks (e.g. the tracker one will handle pedestals, and occupancy for instance, while the trigger one will handle masks and trigger lut) "Physically", only one class will manage both the tracker and the trigger : AliMUONPreprocessor. Depending on the subsystem and on the task to be performed (based on the run type), this class will instanciate the correct set of AliMUONVSubProcessor(s) which does the actual job. Output of most processors will end up in OCDB (Offine Condition DataBase). A set of helper functions to peek at this OCDB are gathered in AiMUONCDB class.

# TestMUONPreprocessor.C

This is the master macro used to check the MUON part of the Shuttle. Depending on what you want to test, you'll have to modify the input files (using shuttle->AddInputFile) and/or the run type (using shuttle->AddInputRunParameter())

# AliMUONPreprocessor(const TString& detName)

Depending on how this one is constructed, and depending on the runtype, it will perform differents tasks. Note that for the moment the runtypes are "fake", i.e. put by hand in the TestMUONPreprocessor.C macro, and might not correspond to the final values to be used by the DAQ.


detName   runType                     task to be done           worker class (AliMUONVSubprocessor child)
--------------------------------------------------------------------------------------------------------
MCH       PEDESTAL                    read ASCII ped files      AliMUONPedestalSubprocessor
and put them into OCDB
MCH       GMS                         read GMS alignment files  AliMUONGMSSubprocessor
and put them into OCDB
MCH       PHYSICS                     read DCS HV values and    AliMUONHVSubprocessor
put them into OCDB
MTR       CALIBRATION         read date files (masks,   AliMUONTriggerSubprocessor
crates, and LUT)
and put them in OCDB
MTR       PHYSICS                     read date files as in     AliMUONTriggerDCSSubprocessor
CALIBRATION,
and put them in OCDB

# Pedestals

Two options here. You can either use a pre-done set of ASCII pedestals files (generated as explained below for the 2nd option), located at /afs/cern.ch/user/l/laphecet/public/LDC*.ped, or build you own set.

We've written an AliMUONPedestalEventGenerator which creates fake pedestal events. The pedestal values are taken from the Offline Condition DataBase (OCDB) (which is itself fakely filled using the static WritePedestals() method of AliMUONCDB class

So first generate a valid pedestal CDB entry by using the AliMUONCDB class. There's one little trick : you should first point to the "default" OCDB (local://$ALICE_ROOT/OCDB) in order to get the mapping loaded, then only you can play with another OCDB. Or, alternatively, you can put the mapping stuff in the test OCDB, like this : root[] AliMpDDLStore::ReadData(); // read mapping from ASCII files root[] const char* cdbpath="local://$ALICE_ROOT/OCDB/SHUTTLE/TestShuttle/TestCDB"; // where to put the CDB
root[] AliCDBManager::Instance()->SetDefaultStorage(cdbpath);
root[] AliMpCDB::WriteMpSegmentation();
root[] AliMpCDB::WriteDDLStore();


If you've not put the mapping in the test database, then you must start with the default OCDB, load the mapping, and then only switch to the test database :

root[] AliCDBManager::Instance()->SetDefaultStorage("local://$ALICE_ROOT/OCDB"); // only if you've not put the mapping in test OCDB root[] AliCDBManager::Instance()->SetRun(0); // only if you've not put the mapping in test OCDB root[] AliMpCDB::LoadDDLStore(); // only if you've not put the mapping in test OCDB // below are lines to be executed whatever you did with the mapping... root[] const char* cdbpath="local://$ALICE_ROOT/OCDB/SHUTTLE/TestShuttle/TestCDB"; // where to put the CDB
root[] AliCDBManager::Instance()->SetDefaultStorage(cdbpath);
root[] Bool_t defaultValues = kFALSE; // to generate random values instead of plain zeros...
root[] Int_t startRun = 80;
root[] Int_t endRun = 80;
root[] AliMUONCDB::WritePedestals(defaultValues, startRun, endRun);


Expected output is (don't worry about the warnings, they are harmless) :

I-AliMUONCDB::ManuList: Generating ManuList...
I-AliMUONCDB::ManuList: Manu List generated.
I-AliMUONCDB::MakePedestalStore: 16828 Manus and 1064008 channels.
I-AliMUONCDB::WritePedestals: Ngenerated = 1064008
I-AliCDBManagerInit: AliEn classes enabled in Root. AliCDBGrid factory registered.
I-AliCDBManager::SetDefaultStorage: Setting Default storage to: local://$ALICE_ROOT/OCDB/SHUTTLE/TestShuttle/TestCDB I-AliCDBLocal::PutEntry: CDB object stored into file ($ALICE_ROOT)/SHUTTLE/TestShuttle/TestCDB/MUON/Calib/Pedestals/Run80_80_v0_s0.root


Then use the AliMUONPedestalEventGenerator to produce simulated pedestal events.

Usage (from the Root prompt) :

AliMpCDB::LoadDDLStore2(); // load mapping from "default" OCDB=local://$ALICE_ROOT/OCDB AliCDBManager::Instance()->SetDefaultStorage(cdbpath); // so you will read // back pedestals values generated in the previous step const char* dateFileName = "raw.date"; // base filename for the output Int_t runNumber = 80; // run number used to fetch the pedestals from the OCDB Int_t nevents = 100; // # of events to generate. 100 should be enough gSystem->Load("libMUONshuttle"); // needed or not depending on whether it's already loaded or not AliMUONPedestalEventGenerator ped(runNumber,nevents,dateFileName); ped.Exec("");  It will take a lot of time (mainly due to the fact that we're writing a bunch of ASCII files = DDL files), so please be patient. The output should be the normal simulated sequence of MUON.Hits.root, MUON.SDigits.root, MUON.Digits.root, raw/*.ddl files and raw.date.LDCi where i=0-3 (i.e. one DATE file per LDC, as will be used in real life), the latter ones being roughly 100 MB each. FIXME : instructions below should be replaced with usage of MUONTRKda The raw.date.LDC* files are then processed using the DA online program (which is not built by default, but must be made explicitely using make daqDA-MCH from$ALICE_ROOT, and requires some DATE setup..., see MUON Tracking DA )

 MUONTRKda.exe -f raw.date.LCDi -a LDCi.ped (i=0,1,2,3)
 (repeat for each LDC)


The LDCi.ped files are the input for the pedestal subprocessor, which is tested using the TestMUONPreprocessor.C macro. The output of the pedestal subprocessor (upon success only) is written into the OCDB. Difference between the input and the output can be inferred using the diff() function of MUONCDB.C macro.

# HV

HV DCS values are created in CreateDCSAliasMap() of TestMUONPreprocessor.C You might want to modify this function to create a given set of error conditions in order to test whether the HVSubprocessor is reacting properly to those errors.

# GMS

The GMS alignment data for testing can be generated with the macro MUONGenerateTestGMS.C: The matrices of TGeoHMatrix type, with TObject::fUniqueID equal to the geometry module Id, are put in a TClonesArray and saved in the Root file with a key "GMSarray".

# Trigger DCS

HV and currents DCS values are created in CreateDCSAliasMap() of TestMUONPreprocessor.C As done in Tracker HV, you might want to modify this function to create a given set of error conditions in order to test whether the TriggerDCSSubprocessor is reacting properly to those errors.

COMMENT: the trigger subprocessor requires trigger .dat files to be present. In order to test only the DCS values when the remaining trigger files are not present, a workaround is put in the TestMUONPreprocessor.C which creates fake date files. This results in some "ERROR" flags appearing in the LOG file (for masks and LUT), which are absolutely expected. The fake date files are automatically removed at the end of the macro.

This chapter is defined in the READMEshuttle.txt file.