Hii @Piet @hschindl sir, i want to simulate Photon transport using Heed in single layer gem detector.
Sorry if the question is silly, or the answer is obvious…
i don’t know my question is wrong or right but i want to simulate charged particle ionization using Heed. below i have attached my file can you check this and suggest me.
fe55.txt (2.4 KB)
also i have attached the histogram
Hi,
just to better understand your question: do you want to simulate ionisation by a photon or by a charged particle (in your post you mention both)?
For photons, the script you sent looks reasonable to me at first glance. In your histogram you have a huge peak at zero electrons. That’s probably because there is a high chance that the photon will leave the detector without interacting. You might want to change your loop such that you only count events with a non-zero number of ionisation electrons.
Sir, i basically want to simulate the Number of electrons produced by a photon with the energy of 8.04 keV simulated in Heed(track) in single layer GEM geometry detector. For this what can i do?For this what can i do?
Then the script you sent is a good starting point. You’ll need to change the value of egamma to 8040 (eV), and perhaps also adjust the range of the histogram.
Looking at your histogram, this is exactly what you expect. Assume your gas mixture is Ar:CO2 70:30, you can look up in XCOM [1] the absorption factor, at 8keV this is mostly
photo-electric absorption: 8.47cm2/g. You multiply this with the density of the Ar:CO2 mixture, which is 1.83E-3 g/cm3 to find an absorption (mu) with units cm-1 and you can apply
the Lambert-Beer law: I = I_0 exp(-mu*x). This gives me an absorption of only 5% in 3mm of gas or 15% in 1cm of gas, exactly what you see in your histograms with >90% zero electrons.
greets
Piet
[1] XCOM: Photon Cross Sections Database
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