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D3DEnergetic / FIDASIM

A Neutral Beam and Fast-ion Diagnostic Modeling Suite
http://d3denergetic.github.io/FIDASIM/
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NPA & pNPA "missed detector" errors #176

Closed BlehMaks closed 5 years ago

BlehMaks commented 5 years ago

Dear FIDASIM team,

Now we have only one problem left with FIDASIM simulations on TCV. This problem appears for every NPA lines of sight, that we tried. When NPA and pNPA Monte-Carlo simulations are running, there are errors of such type as "NPA_F: Missed Detector 3" "PNPA_F: Missed Detector 3". Number of missed particles is relatively small comparing to number of particles that "hit" detector (~100/50000 respectively). Could you please help to understand what can cause these errors and how we can solve this problem in general? Please find input files in attachment. Thank you in advance!

Best regards, Maksim npa_errors.zip

BlehMaks commented 5 years ago

Also, please find attached input files which exactly describe experimental setup for this particular shot 62124. The first message contains NPA lines of sight which are also possible since TCV has remote control of NPA lines of sight. Please let me know, if you require some additional data. Thank you in advance for your help and comments! Best regards, Maksim npa_err_exp_setup.zip

lstagner commented 5 years ago

This is a common problem which I haven't figured out yet. It is most likely due to floating point errors. Since the number of missed particles is small compared to the number that hit, it is safe to ignore these errors.