The target, degrader, and beam form a single subsystem. In both versions so far, the simulation starts with the degrader. The Cerenkov and BWPC's are not simulated.
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The old version is the Jet Chamber, the new version is the UTC.
UMC has never multiplexed the inner layers: they were multiplexed in specialized code for triggering and tapewriting. In the former, the decision on whether to multiplex or not is made via the TRIGGER version. Tapewriting of the RS or RD banks is controlled by IRSVER.
The user can choose to put RSPC's or RSSC's into the stack in any combination. The default RS has RSPC's in the usual locations. To switch to RSSC's, add
'LAYRRS' 78 3 ! RSSC
'LAYRRS' 78 5 ! RSSC
to the .par file.
There is only one version of the barrel veto.
The new endcap code includes the CsI endcaps and the lead-scintillator collar counters. The microcollar is not included. The versions of the two endcaps can be controlled independently. A schematic sketch of the OLD endcap geometry can be seen in $UMC_ROOT/v5/ec_old.ps.
Assignments of the various files needed for the trigger are in $UMC_COM/generic_xx.sh. No version of the trigger simulates anything beyond Level 1. An example of user code that calls and uses the trigger is in umctrig.cdf.
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