I finished the (final?) simulations regarding the scattering of the BS recoil mass with the revised model of the BS, which I got from Fabian.

Basically, as expected, no significant effect could be found on KAGRAs sensitivity.

However, I have widen the previous model with the view on the clear-aperture of 195mm. Additionally, I found a way how to add a quasi-elliptical light-source for the mirrors surface, which is of great advantage for increasing the resolution of the results and to minimize the statistical error. 

Right now, the error for the maximum values is ca. 10% but further decreasing it is no problem because of the mentioned reasons. Maybe, I will make another simulation run on Monday with increased resolution, also because of having better results for my paper.