Dear experts, I would like to ask that I am perform calculate shooting a ion beam to a thin target (several cm) and I use a sphere + cosine card (F1). but where should I locate the center of the sphere? in the middle of the target or on the surface behind of target.
Further more, Some one guide me how to plot graphic and geometry?
Any advice.
Thank you very much.
Hello;
I'am not really expert, but I'am a user of MCNP code and I dealt few years ago with F Tally card and I think that for symmetry reasons your sphere center should correspond with a middle of the target, in aim to obtain normalized number of particles / surfaces, elsewhere you should make some geometrical calculations to plot a accurate particle spectra.
for plot graphic and geometry, there are two ways:
- direct ay ith Vised editor: an graphical interface of MCNP5 (under windows and I think there an available release under other OS like linux...)
- if you are working with line command terminal, you have to use line command as:
> mcnp ip inputfile.name
many options are available on MCNP user guide, it just depends which release are you using (MCNP5 or MCNPX)
Probably there will be more complete answers than mine, hope I could help a litte;
good luck;
Saladin
Yes, you was right. I also thought the center at middle point better. but when I executed my program there was a big trouble concerning error, at small angle the error correspond very well, with larger angles unacceptable error. although I set NPS=10e8 par, and it took 1 day for runtime, I tried to subdivide target cell with importance monotonically increase. error was better but so long runtime. Do you have any idea for variance reduction technique for decreasing runtime?
I am using MCNPx, and I want to evaluate double differential cross section, I known MCNP can plot directly DDX, but I don't know how to plot. can you precise command line for visualizing?
one more question that I wanna divide energy into bins, but there are many methods to do that. ex log and linear such as "0.1 10logi 10 50i 100". so how I need to subdivide for a good result, because the quality of graphic depends on energy ranges a lot.
Thank you for your answer.
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