Embed particles on a pseudocolor plot

[deSUBHAM]

Hi,

I have a data file, which contains field and particle data. Now, I plotted a pseudocolor plot for Jy as a function of x and z. A screenshot of this plot and other details has been attached here. Based on the screenshot, I have a few queries.

1. I want to embed particles on top of the Jy plot. There are four kinds of particles (as obvious from the screenshot): electrons, positrons, electrons_b and positrons_b. Now, for instance, I want to embed 'electrons_b' on top of that Jy plot. How to do that?
2. I want to make a phase space plot for particles, i.e., the x-ux or z-uz plot. For example, if I want to plot 'x_electrons_b' vs 'ux_electrons_b', how would I do that? Can it be done with a 'scatter' plot?
3. Can I reduce the number of particles and check how they evolve over time in the phase space? For instance, if I have datasets at different times and I want to check the dynamics of one or two particles in the phase space, how would I do that?
4. Instead of Jy, I want to plot the multiplication of Ey with Jy (i.e., EyJy, or ExJx, or Ez*Jz). How could I do that?

Thank you.

[markcmiller86]

• I want to embed particles on top of the Jy plot. There are four kinds of particles (as obvious from the screenshot): electrons, positrons, electrons_b and positrons_b. Now, for instance, I want to embed 'electrons_b' on top of that Jy plot. How to do that?

For 2D plotting, VisIt tries to be smart about placing plots with areal entities (polygons) behind plots with point or curve entities. So, the basic idea is just add the point plots and VisIt should plot them on top of the 2D areal plot you show here. Sometimes, you have to go to the plot list (the list of plots in the panel at left) and drag the plots around in order in the list to force VisIt to plot them in a specific order you need...top most in the list I think is drawn last.

• I want to make a phase space plot for particles, i.e., the x-ux or z-uz plot. For example, if I want to plot 'x_electrons_b' vs 'ux_electrons_b', how would I do that? Can it be done with a 'scatter' plot?

Yes, sounds like a scatter plot to me.

• Can I reduce the number of particles and check how they evolve over time in the phase space? For instance, if I have datasets at different times and I want to check the dynamics of one or two particles in the phase space, how would I do that?

For point-meshes (and variables thereon), you can use Index Select operator in 1D mode

• Instead of Jy, I want to plot the multiplication of Ey with Jy (i.e., Ey_Jy, or Ex_Jx, or Ez*Jz). How could I do that?

Sounds like you might need to use VisIt's expressions for this. Define the expression and plot that.

[deSUBHAM]

Thank you so much.