TIME–CUT

Summary

Sets transport time cutoffs for different particles ​

​

See also TCQUENCH

WHAT(1) =

transport time cutoff (ns)

Default

:  no cut off

WHAT(2)

: not used

WHAT(3)

: not used

WHAT(4) =

lower bound of the particle numbers (or corresponding name) for which the transport time cutoff and/or the start signal is to be applied

(“From particle ``WHAT(4)``…”)

Default

= 1.0

WHAT(5) =

upper bound of the particle numbers (or corresponding name) for which the transport time cutoff and/or the start signal is to be applied

( “…to particle ``WHAT(5)``…”)

Default

= WHAT(4)  if WHAT(4) > 0.0, all particles otherwise

WHAT(6) =

step length in assigning particle numbers

(“…in steps of ``WHAT(6)`` ”)

Default

= 1.0

SDUM

: not used

Default

: (option TIME–CUT not given): no time cutoff for particle transport

Notes

1. The transport time cutoff defined by TIME–CUT should not be confused with the time cutoff for scoring defined by TCQUENCH (see Note 3 to option TCQUENCH).

2. Particles outside the time gate​ defined by TIME–CUT are discarded (a summary​ is printed at the end of the standard output​).

3. If the source has been defined as a radioactive isotope ​ (command BEAM with SDUM = ISOTOPE), transport of each isotope decay secondary starts with an age​ equal to the time of decay.

Example:

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...+...8
TIME-CUT      3000.0       0.0       0.0       8.0       0.0       0.0
*  Stop transporting neutrons after 3000 nsec