[mcxtrace-users] some questions about McXtrace

[Ali Kazemi]

Hi




1) There
is a “phase” parameter in the source components. I know the meaning of phase
for waves but I don’t understand the determination of phase with a number. For example,
for the source _Pt the default phase is -1. What does it mean?


2) The goal of putting a target for
sources is to restrict our radiation to a solid angle. Isn’t it? 





3) Do the x-rays get traced beyond this
virtual target (figure 1) or not (figure 2)?




4) when the “random phase” is set to 1
it means that the source is spatially incoherent and when set to 0 it means
that the source is spatially coherent?




5) It is mentioned in the component
manual that “photons within the slit opening are unaffected, while all other
photons are discarded”. I want to simulate a gold mask with some parallel slits
(masks used in EI method in phase contrast x-ray imaging). If I put some slits
and filters (with material data file gold) alternatively in y direction, do the
x rays which hit the masks get discarded or attenuated? If discarded, what is
the solution?



6) I am windows user and I couldn’t
download data files from NIST FFAST as it was described in the component
manual. (figure 3)




7) I couldn’t find the contrib
directory where components that were submitted by users is there.
8) 


COMPONENT transfocator1=Lens_simple(

     
xwidth=2e-1,yheight=2e-1,N=T1_N, material_datafile="Be.txt")

WHEN(1) AT(0,0,31.5) RELATIVE Origin

ROTATED (0,ANGLE,0) RELATIVE PREVIOUS


What is the meaning of the condition
WHEN(1) and when it get satisfied?






 






9) I didn’t understand what “restore x
ray” means in monitors?




10) in the instrument file of “Test sources”
example, the first source is set to E0 = 5, dE = 1. But what energy monitor
shows is dE = 0.5. (figure 4)


11) what is the “I_err” in the PSD
monitors and why are its value the same as intensity values?



12) It is mentioned in the component
manual that the output of monitors are intensity, counts and M(x,y). what is M?



13) Are the monitors considered virtual
components and we can put some monitors in a same position?


14) Is the distance that x rays travel
till hitting a component considered vacuum?


15) when we want to simulate x-ray
imaging, should we use “Absorption sample” as a sample? Don’t you think the
geometry of a sample is so limited in McXtrace?


16) Does refraction happen in “Absorption
sample” apart from attenuation?


17) sorry for large number of
questions!


Thanks 


















 		 	   		  
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