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Across the beam gap, the geometric numbering continues to increment even where there are not physically crystals present.

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Accessing ECAL Channel Conditions in Java

Before the conditions can be accessed, the DatabaseConditionsManager must be created and initialized correctly, which should happen automatically if you are running a command line job or using the monitoring application.

The ECAL channel conditions can be accessed in user code in the following way.

// Get ECAL conditions.
EcalConditions ecalConditions = ConditionsManager.defaultInstance().getCachedConditions(EcalConditions.class, TableConstants.ECAL_CONDITIONS).getCachedData();

// Get the list of EcalChannel objects.
EcalChannelCollection channels = ecalConditions.getChannelCollection();        

The channel mapping is modeled by the EcalChannel class which has the unique channel ID plus the associated geometric and DAQ information.

Once retrieved from the conditions system, a channel object can be used to get the conditions constants associated with a single crystal.

EcalChannelConstants channelConstants = ecalConditions.getChannelConstants(anEcalChannelObject);

Channels may be looked up in the collection using several different search methods.

// Find a channel by its encoded geometric ID e.g. from an LCIO hit object like CalorimeterHit.
CalorimeterHit hit = ...;
EcalChannel channel = channels.findGeomtric(hit.getCellID());

// Find a channel by its unique channel ID.  This finds channel #1.
EcalChannel channel = channels.findChannel(1);

// Find a channel by its DAQ information.  This looks up the crystal connected to crate 1, slot 20 and channel 12 on the DAQ.
EcalChannel channel = channels.findChannel(new DaqId(new int [] { 1, 20, 12 } ));

There are several other ways of looking up channels not listed here.  Please refer to the source code for EcalChannel for complete details.

ECAL Channel Mapping Table Dump

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