Inquiry on Dynamic Energy-Dependent Charge Cloud Size

[zql2021]

Hi Felix,

I’m currently working on a double-sided strip HPGe, where charge cloud size is critical. If I understand correctly, the current code uses a fixed initial charge cloud size regardless of deposited energy.

To address this, I propose simulating charge cloud dimensions vs. energy via Geant4 to get an approximate curve. This would allow interpolating energy-dependent initial charge cloud sizes in the SSD.

Do you think this is feasible? Are there any recommendations I should note?

Thank you for your guidance!

[fhagemann]

You could try out different things by overwriting SolidStateDetectors.radius_guess, that takes charge (not energy!) and particle type as argument: src/ChargeCloudModels/ParticleTypes.jl

You can generate some curve using Geant4 and use that as input.

I am also gonna shamelessly copy some text from my thesis about this including references:

[178] https://doi.org/10.1109/23.682461
[179] http://physics.nist.gov/Star
[180] https://doi.org/10.1103/RevModPhys.56.S1
[181] https://doi.org/10.1007/s10686-023-09914-8

[zql2021]

Thank you for the helpful suggestions and references!

[fhagemann]

If you come up with something robust and test it well, we can also update SSD to use that instead of the default fixed size radius guess that we are using right now

[zql2021]

Absolutely！