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add docs for energy cutoff

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Qingming He 2016-10-11 14:35:53 -04:00
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docs/source/usersguide/input.rst
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@ -121,10 +121,13 @@ multi-group mode.
``<cutoff>`` Element
--------------------
The ``<cutoff>`` element indicates the weight cutoff used below which particles
undergo Russian roulette. Surviving particles are assigned a user-determined
weight. Note that weight cutoffs and Russian rouletting are not turned on by
default. This element has the following attributes/sub-elements:
The ``<cutoff>`` element indicates two kinds of cutoffs. The first is the weight
cutoff used below which particles undergo Russian roulette. Surviving particles
are assigned a user-determined weight. Note that weight cutoffs and Russian
rouletting are not turned on by default. The second is the energy cutoff which
is used to kill particles under certain energy. The energy cutoff should not be
used unless you know particles under the energy are of no importance to results
you care. This element has the following attributes/sub-elements:
:weight:
The weight below which particles undergo Russian roulette.
@ -137,6 +140,11 @@ default. This element has the following attributes/sub-elements:
*Default*: 1.0
:energy:
The energy under which particles will be killed.
*Default*: 0.0
.. _eigenvalue:
``<eigenvalue>`` Element