|Message: Choosing maximum step in G4Step||Not Logged In (login)|
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I am wondering the rule of the thumb for choosing the maximum step. I just found that the secondary electron production by proton incident on a metallic target depends on maximum step, and also that production of ion pairs in a gas at low pressure depend on maximum step too. I used the default DLB_MAX and got no ion pair when a proton traverse a low pressure N2 gas. At first, it was difficult to explain, more so when firing the proton with an initial kinetic energy as opposed to applying electric field which i did previously, produces some ion pairs. However, when I lowered the step maximum to 1 mm, I got the expected ion pair production per proton. So I am wondering what should be the rule of the thumb when selecting the step max in order to geth the expected result. (Dimension of my simmulation along the particle direction is 6 cm.)