Difference between revisions of "Keyword:STEP"

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This keyword starts the solution of the inventory equations over the time interval specified. It differs from the [[Keyword:ATOMS | '''ATOMS''']] keyword in that it generates only a single time line for each time interval. Its primary use is in multiple step irradiation phases. An example of this use is when the irradiating flux is repeatedly adjusted to maintain a constant power level:
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This keyword starts the solution of the inventory equations over the time interval specified. It differs from the [[Keyword:ATOMS | '''ATOMS''']] and [[Keyword:SPECTRUM | '''SPECTRUM''']] keywords in that it generates only a single time line for each time interval. Its primary use is in multiple step irradiation phases. An example of this use is when the irradiating flux is repeatedly adjusted to maintain a constant power level:
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Note that without using [[Keyword:ATOMS | '''ATOMS''']], [[Keyword:SPECTRUM | '''SPECTRUM''']], or [[Keyword:STEP | '''STEP''']] after each time interval, the rate equations will not be solved. Omission of these keywords will not result in an error and calculations will run, but the results will not be as expected.
  
 
Example usage, where multiple steps are performed to maintain constant power and the nuclide inventory output is not required for each step:
 
Example usage, where multiple steps are performed to maintain constant power and the nuclide inventory output is not required for each step:

Latest revision as of 13:27, 10 May 2019

STEP


This keyword starts the solution of the inventory equations over the time interval specified. It differs from the ATOMS and SPECTRUM keywords in that it generates only a single time line for each time interval. Its primary use is in multiple step irradiation phases. An example of this use is when the irradiating flux is repeatedly adjusted to maintain a constant power level:

Note that without using ATOMS, SPECTRUM, or STEP after each time interval, the rate equations will not be solved. Omission of these keywords will not result in an error and calculations will run, but the results will not be as expected.

Example usage, where multiple steps are performed to maintain constant power and the nuclide inventory output is not required for each step:

< -- Control phase -- >
...
FISPACT
* Title of the simulation
< -- Initial phase -- > 
...
< -- Inventory phase -- > 
...
PULSE 9
POWER 120.0 1 301
TIME 0.1 YEARS STEP
ENDPULSE
POWER 120.0 1 301
TIME 0.1 YEARS ATOMS
...