Dear TraceWin Community,
I’m completely new to TraceWin and have several beginner-level questions. I would greatly appreciate any clarifications:
1. How can I extract beam information (e.g., RMS size, twiss parameter, etc.) at any arbitrary z-position along the beamline, not just at the exit of defined elements?
2.What kind of initial beam distribution does TraceWin assume when defining a beam? For example, is it Gaussian, Waterbag, or uniform by default?
3. When the menu refers to “multiparticle” simulations, does it mean:
a) a large number of particles of the same species, or
b) a beam composed of different particle species?
4. How does TraceWin calculate the Full Width at Half Maximum (FWHM) from sigma (RMS)? Does it assume a Gaussian distribution (it seems to me FWHM ≈ 3.5*σ, but i think for gaussian its around 2.35*σ)?
5. what is Correct Method for Defining Input Beam Parameters
what i do is I estimated x_rms from beam profile and assumed a value for x’rms. Then I calculated the Twiss parameters (α, β) from these. then, In the main window, I entered the normalized RMS emittance and Then, using the “Twiss parameters” button, I opened the input beam parameters dialog box and entered α and β. The visual preview showed values for xmax and x’max, which matched my initial value.
However, during the run, I noticed the beam envelope starts with ~4σ instead of 1σ so i want to know the initial beam distribution used?
Thank you in advance for your guidance!
Beam information
Re: Beam information
Dear mahendra2,
TraceWin has a dual simulation engines: second-order moment envelope & non-linear macro-particle
tracking.
And depending on where you stand, the answers to your questions will be different. I'm going to reply considering that you're essentially talking about tracking.
1. You cannot, except for FIELD_MAP elements otherwise you have to cut the elements into smaller pieces.
2 . The type of distribution can be selected in the page "Mutiparticle" -> "Input distribution types"
3.
a) You have to set the number of particles in page "Main"
b) The particle distribution is necessarily of the same species, although TraceWin can simulate 2 different distributions, but not at the same time.
4. The width at half-height is calculated from the projection of the particle distribution in tracking mode, in envelope mode the beam is considered to be uniform.
5) The plotted beam envelope is equal to Nxrms and you defined "N" in the graph options ("Scales" button).
Regards,
Didier
TraceWin has a dual simulation engines: second-order moment envelope & non-linear macro-particle
tracking.
And depending on where you stand, the answers to your questions will be different. I'm going to reply considering that you're essentially talking about tracking.
1. You cannot, except for FIELD_MAP elements otherwise you have to cut the elements into smaller pieces.
2 . The type of distribution can be selected in the page "Mutiparticle" -> "Input distribution types"
3.
a) You have to set the number of particles in page "Main"
b) The particle distribution is necessarily of the same species, although TraceWin can simulate 2 different distributions, but not at the same time.
4. The width at half-height is calculated from the projection of the particle distribution in tracking mode, in envelope mode the beam is considered to be uniform.
5) The plotted beam envelope is equal to Nxrms and you defined "N" in the graph options ("Scales" button).
Regards,
Didier