FernPannell: Created page with "Simulation of short driver bunches. Beams are defined directly within the configuration and beamfiles run through lem.py for diagnostics. (LCODE configuration takes m/q, but re..."

2022-09-09T22:34:10Z

Created page with "Simulation of short driver bunches. Beams are defined directly within the configuration and beamfiles run through lem.py for diagnostics. (LCODE configuration takes m/q, but re..."

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Simulation of short driver bunches. Beams are defined directly within the configuration and beamfiles run through lem.py for diagnostics.

(LCODE configuration takes m/q, but resulting beamfiles are in q/m).

{| class="wikitable"
!Run Number
!Base Configuration
!Window Width
!Window Length
! q/m
!Total Weight (pC)
!LCODE ampl
!LCODE Beam Current
!LCODE Beam Length
!Beam Length (um)
!Energy (approx) (GeV)
!Comments
|-
|1 || short_bunch - DAC || 3 || 10 || 1.0 || -2045.504558 || 1 || -3.6 || 0.1 || 3.63 || 30 || Default DAC short_bunch.cfg
|-
|2 || short_bunch - DAC || 3 || 10 || 0.00054 || -2045.504558 || 1 || -3.6 || 0.1 || 3.64 || 30 || Only change made to cfg m/q for protons. Ez plots for 1 and 2 are identical.
|-
|3 || short_bunch - DAC || 3 || 20 || 1.0 || -2045.504558 || 1 || -3.6 || 0.1 || 3.64 || 30 || Plot x-range increases with window length increase.
|-
|4 || short_bunch - DAC || 3 || 100 || 1.0 || -2045.504558 || 1 || -3.6 || 0.1 || 3.63 || 30 || Expecting Ez fall off with distance. Do observe this.
|-
|5 || short_bunch - DAC || 3 || 100 || 0.00054 || -2045.504558 || 1 || -3.6|| 0.1 || 3.64 || 30 || Checking to see if Ez attenuation with distance is different for q/m=1/1836 (proton ). Identical plots.
|-
|6 || short_bunch - DAC || 3 || 20 || 0.00054 || -2045.504558 || -1 || -3.6 || 0.1 || 3.64 || 30 || Can compare this with run 3 as mass not impacting currently. Identical despite ampl=-1 meaning should be opposite charge. Will set this directly in m/q next.
|-
|7 || short_bunch - DAC || 3 || 20 || 1.0 || -2045.504558 || 1 || -3.6 || 0.1 || 3.63 ||30 || Despite setting m/q=1 in cfg, lem still shows positive and so results identical to run 3.
|-
|8 || short_bunch - DAC || 3 || 20 || 1.0 || -2045.504558 || -1 || -3.6 || 0.1 || 3.63 ||30 || Keeping m/q as negative and making ampl=-1. Still no change. It seems (from previous knowledge) only changing the sign of the beam current in cfg makes a difference to m/q sign.
|-
|9 || short_bunch - DAC || 3 || 20 || 1.0 || 2045.504558 || 1 || +3.6 || 0.1 || 3.63 ||30 || Return to run 3 parameters but set current to positive. Saying q/m is +1 still, but total weight is now positive, suggesting previous runs have been negative species and this is positive.
|-

Plasma Wakefield/Poster Simulation 09-09-22 - Revision history

FernPannell: Created page with "Simulation of short driver bunches. Beams are defined directly within the configuration and beamfiles run through lem.py for diagnostics. (LCODE configuration takes m/q, but re..."