Debug Options

Debug flags exists in both the TGEO (word: _DBG_FLGS) and GEDS (word: _DBG) banks. By default they are off and should be left this way for production work.

For debug work, one feature you may like to play with is the ``poisoned region''. Setting bit 0 of word _DBG of a region's GEDS bank, makes the region poisoned. For example:-

$geom_region_debug $D2O 1

makes the D$_2$O region poisoned. What this means is that:-

• Any particle entering a poisoned region is killed.

• Any particle created within the region is killed if transported by EGS i.e. gammas and electrons. Other particles are propagated.

So this feature can be used focus the Monte Carlo on a subset of the full detector.