2. How COSP works
- When the COSP feature of PHOENICS is used for constant-optimising tasks of type 1 above,
it takes as inputs:
- a Q1 file of multi-run type, which defines the experimental conditions which PHOENICS is
required to simulate;
- a "target data" file which contains the experimental data, for each of these
conditions, with which it is desired that the PHOENICS predictions should agree;
- a preliminary set of values of the constants which it is desired to optimise;
- information about how close a fit it is desired to achieve.
- PHOENICS multi-runs are then performed in repeated cycles. At the end of each cycle, the
predictions are compared with the target data;
- a new set of constants is then selected in accordance with a systematic error-minimising
- the EARDAT file is correspondingly changed; and a new multi-run is then conducted;
- Cycles are terminated when the errors have been sufficiently reduced.
- Similar proceedings take place when the optimisation task is of type2.