anchorMC: Take away need to specify NSIGEVENTS

It should be enough, and less confusing, to just specify the number
of timeframes to be simulated (as well as potentially the timeframe length in orbits).

So we now do the setting for NSIGEVENTS internally (the o2dpg_sim_workflow script
still needs it) but keep the option to provide it for expert studies.

Also taking away the need to provide CYCLE (which is mostly 0 in any case).

Author: sawenzel

MC/run/ANCHOR/anchorMC.sh

@@ -45,9 +45,7 @@ print_help()
   echo
   echo "as well as:"
   echo "NTIMEFRAMES,"
-  echo "NSIGEVENTS,"
   echo "SPLITID,"
-  echo "CYCLE,"
   echo "PRODSPLIT."
   echo
   echo "Optional are:"
@@ -62,6 +60,8 @@ print_help()
   echo "ALIEN_JDL_INVERT_IRFRAME_SELECTION, invertes the choice of ALIEN_JDL_RUN_TIME_SPAN_FILE"
   echo "ALIEN_JDL_CCDB_CONDITION_NOT_AFTER, sets the condition_not_after timestamp for CCDB queries"
   echo "DISABLE_QC, set this to disable QC, e.g. to 1"
+  echo "CYCLE, to set a cycle number different than 0"
+  echo "NSIGEVENTS, to enforce a specific upper limit of events in a timeframe (not counting orbit-early) events"
 }
 
 # Prevent the script from being soured to omit unexpected surprises when exit is used
@@ -142,11 +142,20 @@ fi
 [ -z "${ALIEN_JDL_LPMANCHORYEAR}" ] && { echo_error "Set ALIEN_JDL_LPMANCHORYEAR or ANCHORYEAR" ; exit 1 ; }
 
 [ -z "${NTIMEFRAMES}" ] && { echo_error "Set NTIMEFRAMES" ; exit 1 ; }
-[ -z "${NSIGEVENTS}" ] && { echo_error "Set NSIGEVENTS" ; exit 1 ; }
 [ -z "${SPLITID}" ] && { echo_error "Set SPLITID" ; exit 1 ; }
-[ -z "${CYCLE}" ] && { echo_error "Set CYCLE" ; exit 1 ; }
 [ -z "${PRODSPLIT}" ] && { echo_error "Set PRODSPLIT" ; exit 1 ; }
 
+# The number of signal events can be given, but should be useful only in
+# certain expert modes. In the default case, the final event number is determined by the timeframe length.
+if [ -z "NSIGEVENTS" ]; then
+  NSIGEVENTS=10000 # this is just some big number; In the simulation the event number is the minimum of this number and what fits into a single timeframe
+                   # based on the interaction rate. The number is a reasonable upper limit related to ~5696 collisions that fit into 32 LHC orbits at 2MHz interaction rate.
+fi
+
+if [ -z "${CYCLE}" ]; then
+  echo_info "No CYCLE number given ... defaulting to 0"
+  CYCLE=0
+fi
 
 # this generates an exact reproducer script for this job
 # that can be used locally for debugging etc.