Inconsistent beam emittance values from GUI tools
Posted: Fri 26 Jan 2024 21:24
Dear Didier,
After running TraceWin on a linac input file, I see two different sets of values for the final normalized x-emittance at the exit of the transport. The difference is large (more than a factor of 2). (The discrepancy exists for the other emittances as well as the beam sizes in each dimension, but the differences are much smaller.) I compared values obtained from the GUI using four different workflows:
1) Charts -> Emittances -> Data (to select the final s-position in the output table)
2) Charts -> Output -> enter the final s-position or final element number -> View beam parameters
3) Charts -> Density -> Rms Emittance -> Plot -> Data (to select the final position in the output table)
4) Charts -> PlotWin -> enter the final s-position or final element number -> View beam parameters
The values from 1 and 2 agree with each other, and so do 3 and 4, but the values from 1(2) do not agree with the values from 3(4).
These values do agree at the beginning of the transport, so I am sure that all these procedures should yield consistent normalized emittance values.
I don't understand what the source of this difference could be. Do you have any suggestions?
Thanks,
Chad
After running TraceWin on a linac input file, I see two different sets of values for the final normalized x-emittance at the exit of the transport. The difference is large (more than a factor of 2). (The discrepancy exists for the other emittances as well as the beam sizes in each dimension, but the differences are much smaller.) I compared values obtained from the GUI using four different workflows:
1) Charts -> Emittances -> Data (to select the final s-position in the output table)
2) Charts -> Output -> enter the final s-position or final element number -> View beam parameters
3) Charts -> Density -> Rms Emittance -> Plot -> Data (to select the final position in the output table)
4) Charts -> PlotWin -> enter the final s-position or final element number -> View beam parameters
The values from 1 and 2 agree with each other, and so do 3 and 4, but the values from 1(2) do not agree with the values from 3(4).
These values do agree at the beginning of the transport, so I am sure that all these procedures should yield consistent normalized emittance values.
I don't understand what the source of this difference could be. Do you have any suggestions?
Thanks,
Chad