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Weird signal shape for proportional counter

I am simulating a proportional counter (just to study the basics and to make sure that I am using Garfield correctly) and getting a strange shape for the signals like below:

The top picture is when there is only 1 proton penetrating the detector, and the bottom picture is when 100 protons penetrating the detector.

These are raw current signals produced by Garfield with fC/ns on the y-axis and ns on the x-axis. I am trying to understand why these signals are shaped like that. I would expect the signal to have a sharp rise time and then a slower fall time from what I read in Knoll. So, I just want to make sure that I am not simulating this incorrectly. Here are the files that I use to produce the above data.
signal.cpp (5.5 KB)
isobutane_mobility.txt (379 Bytes)

Please let me know if more details are needed to explain my simulation.

Hi Henry, let me invite @hschindl over, the Garfield expert!


thanks for the nudge, and apologies for not having reacted earlier! I’ll try to look into it today/tomorrow. At first glance, the signal shape doesn’t look totally wrong to me though…

Hi @hschindl,

Thank you for looking into it.

Hi @hschindl,

Have you gotten the chance to look at my code for the proportional counter?