View source for Plasma Wakefield/STFC Summer School 2022 Poster

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.
|-

Driver Density: Long vs Short Proton Bunch

{| class="wikitable"
!Run Number
!Driver Description
!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 || Proton, short beam, shallow plasma || short_bunch - DAC || 3 || 10 || 0.00054 || 2045.504558 || 1.0 || 3.6 || 0.1 || 3.64um|| 30 || USE: PROTON-ANTIPROTON SHORT RANGE COMPARISON. Looks like it has a suck in region first. Good providing the next one does not.
|-
|2 || Anti-proton, short beam, shallow plasma || short_bunch - DAC || 3 || 10 || 0.00054 || -2045.504558 || 1.0 || -3.6 || 0.1 || 3.64um || 30 || USE: PROTON-ANTIPROTON SHORT RANGE COMPARISON. Blowout first shown, good.
|-
|3 ||Anti-proton, short beam, deeper plasma || short_bunch - DAC || 3 || 100 || 0.00054 || -2045.504558 || 1.0 || -3.6 || 0.1 || 3.64um|| 30 || USE: PROTON-ANTIPROTON LONG RANGE COMPARISON.
|-
|4 ||Proton, short beam, deeper plasma|| short_bunch - DAC || 3 || 100 || 0.00054 || 2045.504558 || 1.0 || 3.6 || 0.1 || 3.64um|| 30 || USE: PROTON-ANTIPROTON LONG RANGE COMPARISON. PROTON SHORT + LONG BUNCH COMPARISON.
|-
|5 ||Proton, longer beam, deeper plasma || short_bunch - DAC || 3 || 100 || 0.00054 || 2045.504558 || 1.0 || 3.6 || 0.5 || real length || 30 || USE: PROTON SHORT + LONG BUNCH COMPARISON.
|-
|6 ||Anti-proton, longer beam, deeper plasma || short_bunch - DAC || 3 || 100 || 0.00054 || -2045.504558 || 1.0 || -3.6 || 0.5 || real length || 30 || USE: PROTON SHORT + LONG BUNCH COMPARISON.
|-