## Meeting 2015 10 30 » History » Version 1

*Nicolas Ponieman, 10/23/2015 02:33 PM *

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3 | 1 | Nicolas Ponieman | h1. Meeting 2015 10 30 |

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5 | 1 | Nicolas Ponieman | h2. Objectives Proposed during last meeting |

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7 | 1 | Nicolas Ponieman | # Check the values and precision of the parameters involved in Geant4, QSS and analytical solution are exactly the same. |

8 | 1 | Nicolas Ponieman | # Plot the difference between the simulated velocity and the expected value (which is a parameter in the model). |

9 | 1 | Nicolas Ponieman | # For each simulation with a certain number of planes, calculate the error of the simulation. |

10 | 1 | Nicolas Ponieman | # Improve last meeting plots which compare Geant4, QSS3 and DOPRI5 performance. |

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12 | 1 | Nicolas Ponieman | * Format issues (scales, line colors, etc.) |

13 | 1 | Nicolas Ponieman | * Make statistic on many (10?) simulations for the points and add {simulationTime, simulationTimeError} for each number of planes. |

14 | 1 | Nicolas Ponieman | * How does DOPRI5 find the intersection with the planes? |

15 | 1 | Nicolas Ponieman | # New Experiment: varying stepMax (from 0.1mm to 100mm) calculate the error in the first steps (in the position and in the velocity, also the error which is compared to epsilon in Geant4) |

16 | 1 | Nicolas Ponieman | # Repeat Experiment 1: debug what is the error in Geant4 stepper, which is to be compared with epsilon. |

17 | 1 | Nicolas Ponieman | # New Experiment: study impact of deltaInt parameter in Geant4 when changing the number of planes. |

18 | 1 | Nicolas Ponieman | # Make some experiments with a different magnetic field: |

19 | 1 | Nicolas Ponieman | B(x,y) = (B/R) sqrt( x*x + (y+R)*(y+R)) zhat (where B= constant, zhat is the directional vector along the z axis, R is the radius of the circle) |

20 | 1 | Nicolas Ponieman | This field will keep the problem same as it is, but will give a deviation if the particle is off the circle |

21 | 1 | Nicolas Ponieman | (due to the error of the stepper). |

22 | 1 | Nicolas Ponieman | # Introduce discrete stochastic events simulating an artificial decay. |

23 | 1 | Nicolas Ponieman | # Introduce a different graphical representation (such as changing the color of the scatter points) for each different type of errors. |

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25 | 1 | Nicolas Ponieman | * What are the different possible kind of errors? |