## Meeting 2015 10 30 » History » Version 2

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*Nicolas Ponieman, 10/23/2015 02:38 PM *

**Table of contents**- Meeting 2015 10 30

# Meeting 2015 10 30¶

## Objectives Proposed during last meeting¶

- (P0) Check the values and precision of the parameters involved in Geant4, QSS and analytical solution are exactly the same.
- (P0) Plot the difference between the simulated velocity and the expected value (which is a parameter in the model).
- (P1) For each simulation with a certain number of planes, calculate the error of the simulation.
- (P3) 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?

- (P1) 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)
- (P1) Repeat Experiment 1: debug what is the error in Geant4 stepper, which is to be compared with epsilon.
- (P2) New Experiment: study impact of deltaInt parameter in Geant4 when changing the number of planes.
- (P3) 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). - (P3) Introduce discrete stochastic events simulating an artificial decay.
- 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?

- (P1) Summarize all the information Nico learnt with Soon about the transportation chain in a slide, or a handwritten sketch.