alvin-garcia
commented
1 year ago Increasing to 10 m will solve the issue since it would seem to accommodate even a large device like ITER. However, a safer approach would be to calculate the length based on the geometry of the detector and size of the machine. I did something like this for calculation of the passive neutral grid. This would take more time to develop in FIDASIM, but would avoid unnecessary “in_plasma” checks for smaller devices.
On Tue, Nov 15, 2022 at 11:20 PM Wataru H J Hayashi < @.***> wrote:
Bremsstrahlung will only be calculated when plasma is within 3m ( max_length <= 300cm) of the FIDA lens (with a small margin for random sampling around the lens):
https://github.com/D3DEnergetic/FIDASIM/blob/11fb75191e4da3f50b5d930944ef86ff323a7dec/src/fidasim.f90#L11616-L11621 https://urldefense.com/v3/__https://github.com/D3DEnergetic/FIDASIM/blob/11fb75191e4da3f50b5d930944ef86ff323a7dec/src/fidasim.f90*L11616-L11621__;Iw!!CzAuKJ42GuquVTTmVmPViYEvSg!LfTSyuU2NwfDLZCIYT7U3_T_hpIu2b3ZSUu5MLI0eVZRl-PMhmwMnxfnqbIvurIdMwp_uJj0aNdU01QLPhBP593pePI$
This fails to calculate bremsstrahlung for geometries like this one used for the Large Helical Device: [image: image] https://urldefense.com/v3/__https://user-images.githubusercontent.com/71105393/202081351-3d6e4ea5-db1d-404e-993c-22074f9a2eb2.png__;!!CzAuKJ42GuquVTTmVmPViYEvSg!LfTSyuU2NwfDLZCIYT7U3_T_hpIu2b3ZSUu5MLI0eVZRl-PMhmwMnxfnqbIvurIdMwp_uJj0aNdU01QLPhBPFXUpkJw$ The mesh grid shows the plasma interpolation grid. The green and yellow lines are neutral beams. The blue and red lines are FIDA LOS from 2 different views. The pink shows 3m from the lenses along the sightlines.
One solution could be to just increase the max_length out to some larger value, maybe 10m? @lstagner https://urldefense.com/v3/__https://github.com/lstagner__;!!CzAuKJ42GuquVTTmVmPViYEvSg!LfTSyuU2NwfDLZCIYT7U3_T_hpIu2b3ZSUu5MLI0eVZRl-PMhmwMnxfnqbIvurIdMwp_uJj0aNdU01QLPhBPXnZgmGA$ is there a specific reason to keep it at 3m? If not, and you're okay with this solution, then I can implement this fix.
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-- Alvin Garcia PhD Candidate, Physics University of California, Irvine LinkedIn https://www.linkedin.com/in/alvingarciav/
lstagner
Bremsstrahlung will only be calculated when plasma is within 3m (
max_length<= 300cm) of the FIDA lens (with a small margin for random sampling around the lens): https://github.com/D3DEnergetic/FIDASIM/blob/11fb75191e4da3f50b5d930944ef86ff323a7dec/src/fidasim.f90#L11616-L11621This fails to calculate bremsstrahlung for geometries like this one used for the Large Helical Device:
The mesh grid shows the plasma interpolation grid.
The green and yellow lines are neutral beams.
The blue and red lines are FIDA LOS from 2 different views.
The pink shows 3m from the lenses along the sightlines.
One solution could be to just increase the
max_lengthout to some larger value, maybe 10m? @lstagner is there a specific reason to keep it at 3m? If not, and you're okay with this solution, then I can implement this fix.