I have a few questions about SPIS parameters.
(1) These days, I am trying to shorten the simulation time. I usually set the duration to 0.01 s, and the minimum runtime time is ~260 s when I use the following parameters:
- popDuration ~10^(-8) s
- plasmaDt ~10^(-7) s
- plasmaDuration ~10^(-7) s
My final goal is to increase the simulation duration to one day, as I would like to observe long-term effects and analyze results under a solar scenario. Could you please advise how I should set these parameters to achieve this? I would really appreciate any suggestions for improving the runtime!
(2) When I first ran a simulation in SPIS, I set the electronSecondaryEmission/photoEmission parameter to ‘1’. However, when I change these value to ‘3’, I noticed completely different results. According to the manual, the electronSecondaryEmission/photoEmission are defined as follows:
[electronSecondaryEmission]
Bits go by groups of 3 :
- bit 0: turn on secondary emission under electron impact (if 1),
- bit 1: simulate secondary electron dynamics by PIC model (if 1),
- bit 2 = model secondary emission form secondary electrons (“hoping”)
[photoEmission]
- if 0, no photo-emission
- if 1, photo-emission is turned on with the sun direction defined below (from sun vector (sunX…), no shading for now)
- if 3, photo-emission is turned on with the sun direction defined below (from sun vector (sunX…)) and photo-electron dynamics is modelled (PIC)
Could you explain the physical meaning and differences between setting electronSecondaryEmission/photoEmission to ‘1’ and ‘3’? I would appreciate any help in understanding these simulation results.
