| 17 Apr 2024 |
 vir | Is there any way I can get the electric field of only the electrons? Because, from what I understand, the Ex, Ey and so on contains the electric field of the laser and the particles too, right? | 11:10:44 |
 z10f | no, it's not possible | 11:11:54 |
| z10f | the laser, and plasma electromagnetic fields are on the same grid | 11:12:17 |
| z10f | if you do laser envelope simulations you separate the laser field | 11:12:33 |
| z10f | if you do AM simulations in principle you can filter out the mode 0 | 11:12:53 |
| z10f | but there is no separation of fields by an electron beam for example | 11:13:07 |
| z10f | I don't know your physical set-up, so for the moment I don't have any other clues | 11:13:31 |
| vir | And I also saw that in the track particle diagnostic, Ex and Ey were one of the attributes. So what does it do? | 11:13:32 |
| z10f | these are the fields interpolated at the particle position | 11:13:47 |
| z10f | so the Ex and Ey acting on each tracked electron | 11:13:58 |
| z10f | interpolated from the grid | 11:14:05 |
| vir | In reply to @z10f:matrix.org
I don't know your physical set-up, so for the moment I don't have any other clues I have a Gaussian laser beam which interacts with a thin foil and I want to see the transmitted intensity but I believe that the transmitted intensity also contains the field from the particles (in my case the electrons after the interaction of laser pulse with target) | 11:15:29 |
| vir | In reply to @z10f:matrix.org
so the Ex and Ey acting on each tracked electron Oh ok. Thanks. | 11:15:55 |
| vir changed their display name from virana to vir. | 11:16:14 |
| z10f | In reply to @virana:matrix.org
I have a Gaussian laser beam which interacts with a thin foil and I want to see the transmitted intensity but I believe that the transmitted intensity also contains the field from the particles (in my case the electrons after the interaction of laser pulse with target) ok, you can define a Probe plane after the foil and integrate the intensity that is transmitted | 11:17:16 |
| z10f | In reply to @virana:matrix.org
I have a Gaussian laser beam which interacts with a thin foil and I want to see the transmitted intensity but I believe that the transmitted intensity also contains the field from the particles (in my case the electrons after the interaction of laser pulse with target) * ok, for example you can define a Probe plane after the foil and integrate the intensity that is transmitted | 11:17:25 |
| z10f | but you would not be able to separate the field that is coming with the particles crossing the plane | 11:17:47 |
| vir | Ok thanks. | 11:18:55 |
 fredpz | Or you directly have the poynting fluxes given by the scalar diagnostic | 11:27:56 |
| 18 Apr 2024 |
 Almndn | In reply to @z10f:matrix.org
are you respecting the constraint on the mesh given by the Debye length (which depends on temperature)? See https://smileipic.github.io/tutorials/basics_thermal_plasma.html Thanks @z10f for the hint, yes Debye length is quite important, I will try to check that. | 07:46:34 |
 abigailjames | Hi there. A quick question about chirp. I've tried both the chirp profile as described in the documentation and adding the chirp to the spatial profile. In both cases it appears that the frequency of the pulse continues to change to over the full duration of the simulation rather than the duration of the pulse. Have i misunderstood something? | 17:45:53 |
| fredpz | The frequency will keep changing. There is no precise definition of a "pulse" | 17:55:14 |
| z10f | how did you add the chirp to your profile? or in general what is the space-time profile | 19:03:53 |
| z10f | and how do you see a frequency where the laser pulse is not present? | 19:21:08 |
| 19 Apr 2024 |
 Sanjeev Kumar | In reply to @fredpz:matrix.org
Check the "select" option. You can combine px>10 with t>something i guess select="any(t>10, px>10)" not working in post-processing for TrackParticle diagnostic. | 14:08:03 |
| fredpz | What do you mean | 14:11:02 |
| Sanjeev Kumar | 
Download Electron_bunch_evolution.png | 14:13:34 |
| Sanjeev Kumar | means no change in result with and without select="any(t>10, px>10)". but there should be change. | 14:13:35 |
| fredpz | Why | 15:15:43 |
| fredpz | Are you sure this makes any difference? | 15:16:07 |
