Plasma Wakefield/STFC Summer School 2022 Poster
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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).
| 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. |
| 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 | des | 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 | des | 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 | des | 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 | des | 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 | des | short_bunch - DAC | 3 | 100 | 0.00054 | 2045.504558 | 1.0 | 3.6 | 0.5 | real length | 30 | USE: PROTON SHORT + LONG BUNCH COMPARISON. |