Meeting 2015 10 30 » History » Version 1

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

Meeting 2015 10 30¶

Objectives Proposed during last meeting¶

1. Check the values and precision of the parameters involved in Geant4, QSS and analytical solution are exactly the same.
2. Plot the difference between the simulated velocity and the expected value (which is a parameter in the model).
3. For each simulation with a certain number of planes, calculate the error of the simulation.
4. Improve last meeting plots which compare Geant4, QSS3 and DOPRI5 performance.
• Format issues (scales, line colors, etc.) * Make statistic on many (10?) simulations for the points and add {simulationTime, simulationTimeError} for each number of planes. * How does DOPRI5 find the intersection with the planes?
5. 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)
6. Repeat Experiment 1: debug what is the error in Geant4 stepper, which is to be compared with epsilon.
7. New Experiment: study impact of deltaInt parameter in Geant4 when changing the number of planes.
8. Make some experiments with a different magnetic field:
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)
This field will keep the problem same as it is, but will give a deviation if the particle is off the circle
(due to the error of the stepper).
9. Introduce discrete stochastic events simulating an artificial decay.
10. Introduce a different graphical representation (such as changing the color of the scatter points) for each different type of errors.
• What are the different possible kind of errors?