defines the correspondence between region indices and material indices.
It defines also regions with magnetic field.
See also MATERIAL, MGNFIELD
WHAT(1) = material index
Default = 1.0 (blackhole or external vacuum)
WHAT(2) = lower bound of the region indices with material index equal
to WHAT(1).
("From region WHAT(2)...")
Default = 2.0
WHAT(3) = upper bound of the region indices with material index equal
to WHAT(1).
("...to region WHAT(3)...")
Default = WHAT(2)WHAT(4) = step length in assigning indices
("...in steps of WHAT(4)")
Default = 1.0
WHAT(5) = 1.0 : a magnetic field is present in the region(s) defined
by WHAT(2), (3), and (4)
= 0.0 : ignored
< 0.0 : resets the default (no field) in the region(s) defined
by WHAT(2), (3), and (4)
Default = 0.0 (ignored)
WHAT(6), SDUM : not used
Default (option ASSIGNMAt not requested): all regions are assigned material
1.0 (blackhole) except region 2.0 which is assumed to be COPPER
(FLUKA material 12.0). No magnetic field is the default for all
regions.
Notes:
1) Several ASSIGNMAt definitions are generally necessary to assign a
material to all regions. Standard material names and their numbers
are listed in 5}. They may be redefined and others may be added.
2) Overlapping region indices can be given in several ASSIGNMAt
definitions, each definition overriding the earlier ones. This makes
the assigning of materials very convenient.
3) In practice, option ASSIGNMAt must always be present. (If it is not
chosen, all regions are considered to be black holes except region 2
which is assumed to be COPPER).
4) Magnetic field tracking is performed only in regions defined as
magnetic field regions by WHAT(5) = 1.0. It is strongly recommended
to define as such only regions where a magnetic field actually
exists, due to the less efficient and less accurate tracking
algorithm used in magnetic fields. To define a region as one with
magnetic field and to return systematically B = 0.0 in that region
via the user subroutine MAGFLD must be absolutely avoided (see
MGNFIELD)
Example:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
MATERIAL 13.0 27.0 2.7 10.0 0.0 0.0 ALUMINUM
ASSIGNMA 10.0 1.0 15.0 0.0 1.0 0.0
ASSIGNMA 2.0 5.0 17.0 6.0 -1.0 0.0
ASSIGNMA 2.0 16.0 18.0 2.0 0.0 0.0
* The above definitions mean that all regions from 1 to 15 are
* aluminium with a magnetic field, except regions 5 and 11 which are
* vacuum without any magnetic field. Regions 16, 17 and 18 are also
* vacuum without field.
* Note that in the above example material 10 has been defined
* overriding the pre-defined FLUKA aluminium material, but keeping
* the same material number.
