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Merge branch 'develop' into scopatz-six

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Paul Romano 2016-10-18 22:49:56 -05:00
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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
@ -709,6 +717,36 @@ survival biasing, otherwise known as implicit capture or absorption.
*Default*: false
.. _tabular_legendre:
``<tabular_legendre>`` Element
---------------------------------
The optional ``<tabular_legendre>`` element specifies how the multi-group
Legendre scattering kernel is represented if encountered in a multi-group
problem. Specifically, the options are to either convert the Legendre
expansion to a tabular representation or leave it as a set of Legendre
coefficients. Converting to a tabular representation will cost memory but can
allow for a decrease in runtime compared to leaving as a set of Legendre
coefficients. This element has the following attributes/sub-elements:
:enable:
This attribute/sub-element denotes whether or not the conversion of a
Legendre scattering expansion to the tabular format should be performed or
not. A value of “true” means the conversion should be performed, “false”
means it will not.
*Default*: true
:num_points:
If the conversion is to take place the number of tabular points is
required. This attribute/sub-element allows the user to set the desired
number of points.
*Default*: 33
.. note:: This element is only used in the multi-group :ref:`energy_mode`.
.. _temperature_default:
``<temperature_default>`` Element
@ -872,6 +910,19 @@ displayed. This element takes the following attributes:
*Default*: 5
``<create_fission_neutrons>`` Element
-------------------------------------
The ``<create_fission_neutrons>`` element indicates whether fission neutrons
should be created or not. If this element is set to "true", fission neutrons
will be created; otherwise the fission is treated as capture and no fission
neutron will be created. Note that this option is only applied to fixed source
calculation. For eigenvalue calculation, fission will always be treated as real
fission.
*Default*: true
``<volume_calc>`` Element
-------------------------