Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Missing energy computation in MCfoil and MCxyz kernels ? #138

Open
wants to merge 2 commits into
base: develop
Choose a base branch
from
Open

Missing energy computation in MCfoil and MCxyz kernels ? #138

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
6357a32
Corrected Monte-Carlo formula
clementlfnd Jan 19, 2021
3e63176
Missing energy computation
clementlfnd Jan 20, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 2 additions & 2 deletions opencl/EMMC.cl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,7 @@ __kernel void MC(__global float* Lamx, __global float* Lamy, const float E, cons
c_new = c0;
escape_depth = 0.0f;
alpha = (3.4E-3f)*powr(z,0.66667f)/E_new;
sig_eNA = (5.21f * 602.2f)*z*z/E_new/E_new*4.0f*PI/alpha/(1.0f+alpha)*pow(E_new+511.0f,2.0f)/pow(E+1022.0f,2.0f);
sig_eNA = (5.21f * 602.2f)*z*z/E_new/E_new*4.0f*PI/alpha/(1.0f+alpha)*pow(E_new+511.0f,2.0f)/pow(E_new+1024.0f,2.0f);

mfp = A * 1.0e7f/(rho*sig_eNA);
step = -mfp * log(rand);
Expand All @@ -240,7 +240,7 @@ __kernel void MC(__global float* Lamx, __global float* Lamy, const float E, cons
// Taken from book Monte Carlo simulation for Electron Microscopy and Microanalysis, David C. Joy

alpha = (3.4e-3f)*powr(z,0.66667f)/E_new;
sig_eNA = (5.21f * 602.2f)*z*z/E_new/E_new*4.0f*PI/alpha/(1.0f+alpha)*pow(E_new+511.0f,2.0f)/pow(E+1022.0f,2.0f);
sig_eNA = (5.21f * 602.2f)*z*z/E_new/E_new*4.0f*PI/alpha/(1.0f+alpha)*pow(E_new+511.0f,2.0f)/pow(E_new+1024.0f,2.0f);
mfp = A * 1.0e7f/(rho*sig_eNA);

z11 = seeds[4*id];
Expand Down
4 changes: 4 additions & 0 deletions opencl/EMMCfoil.cl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,10 @@ __kernel void MC(const float E, const int count, const float z, const float rho,
step = -mfp * log(rand);
r_new = r0 + step*c_new*1.0e7f;
r0 = r_new;

de_ds = -0.00785f*(z/(A*E_new)) * log(1.166f*E_new/J + 0.9911f);
E_new += step*rho*de_ds;

counter1 = 0; // This is used as a counter for the number of monte carlo steps to carry out for each electron. This is due to the lock step nature of the GPU code. We have arbitrarily set this to a 300 or so, though this may be material dependent

counter2 = 0; // This counter is used to figure out if the electron has left the sample or not. Again, this is because of the lock step nature. All steps have to be executed on each thread irrespective of the fact that the electron may have actually left the sample
Expand Down
4 changes: 4 additions & 0 deletions opencl/EMMCxyz.cl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -228,6 +228,10 @@ __kernel void MCxyz(__global float* Lamx, __global float* Lamy, __global float*
r_new = r0 + step*c_new*1.0e7f;
//r_new = (float4)(r0.x + step*c_new.x, r0.y + step*c_new.y, r0.z + step*c_new.z, 0.0f);
r0 = r_new;

de_ds = -0.00785f*(z/(A*E_new)) * log(1.166f*E_new/J + 0.9911f);
E_new += step*rho*de_ds;

counter1 = 0; // This is used as a counter for the number of monte carlo steps to carry out for each electron. This is due to the lock step nature of the GPU code. We have arbitrarily set this to a 1000, though this is material dependent

counter2 = 0; // This counter is used to figure out if the electron has left the sample or not. Again, this is because of the lock step nature. All steps have to be executed on each thread irrespective of the fact that the electron may have actually left the sample
Expand Down