******************************************************************************* Near-threshold electron injection in the laser-plasma wakefield accelerator leading to femtosecond bunches ******************************************************************************* Description of the data sets 31/08/2015 Contact name: Mohammad Ranaul Islam Email address: ranaul.islam-at-strath.ac.uk or islamrana@gmail.com NUMERICAL/EXPERIMENTAL DATA DESCRIPTION ======================================== These data are compatible with python plot, gnuplot, grace, etc.. ____________________________________________________________________________________ ___Figure 2 The parameter range for electron trapping solely due to the expanding bubble. The bubble expansion has been modelled as R(t)=R_0(1+\epsilon * t), where \epsilon is the expansion rate, R_0 is the initial bubble radius, and the bubble is spherically symmetric. Fig2.txt First column -> expansion rate (\epsilon/\omega_p), second column -> Bubble radius (R k_p), third column-> Hamiltonian (m c^2) --------------------------------------------------------------------------------------------------- ___Figure 3 Analytical model for injection. Fig3a-column.txt -> contains all data for plot 3(a), i.e., z(t), x(t), gm(t), H(t) Fig3b-column.txt -> contains all data for plot 3(b), i.e., z(t), x(t), gm(t), H(t) Fig3c-column.txt -> contains all data for plot 3(c), i.e., z(t), x(t), gm(t), H(t) Unexpanded bubble shape data -> Fig3-bubble1.txt Expanded bubble shape data -> Fig3-bubble2.txt ------------------------------------------------------------------------------------------------ ___Figure 4 OSIRIS 3D simulation named "simulation-1". The simulation parameters are depicted in the paper. |Fig4a.txt -> extent=(xk_p=-10,10, zk_p=295,315) |Fig4b.txt -> extent=(xk_p=-10,10, zk_p=590,610) Bubble charge density-> |Fig4c.txt -> extent=(xk_p=-10,10, zk_p=689,709) |Fig4d.txt -> extent=(xk_p=-10,10, zk_p=788,808) |Fig4e.txt -> extent=(xk_p=-10,10, zk_p=295,315) |Fig4f.txt -> extent=(xk_p=-10,10, zk_p=590,610) Bubble potential -> |Fig4g.txt -> extent=(xk_p=-10,10, zk_p=689,709) |Fig4h.txt -> extent=(xk_p=-10,10, zk_p=788,808) ----------------------------------------------------------------------------------------------- ___Figure 5 OSIRIS 3D simulations named "simulation-1 & simulation-2". Inputs files are:osiris-simulation1-input and osiris-simulation2-input. |(a) Fig5-simulation1-a1.txt & Fig5-simulation1-a2.txt -> potentials |(b) Fig5-simulation1-b.txt -> initial positions Simulation-1 (left column)-> |(c) Fig5-simulation1-c.txt -> bubble length (k_p) |(d) Fig5-simulation1-d.txt -> expansion rate (\epsilon/omega_p) |(e) Fig5-simulation1-e.txt -> a_0 |(f) Fig5-simulation1-f.txt -> \gamma_b |(g) Fig5-simulation1-g.txt -> \eta |(h) Fig5-simulation1-h-bunch-length.txt | Fig5-simulation1-h-energy-spectrum.txt | Fig5-simulation1-h-z-energy.txt |(a) Fig5-simulation2-a1.txt & Fig5-simulation2-a2.txt |(b) Fig5-simulation2-b.txt Simulation-2 (right column)-> |(c) Fig5-simulation2-c.txt |(d) Fig5-simulation2-d.txt |(e) Fig5-simulation2-e.txt |(f) Fig5-simulation2-f.txt |(g) Fig5-simulation2-g.txt |(h) Fig5-simulation2-h-bunch-length.txt | Fig5-simulation2-h-energy-spectrum.txt | Fig5-simulation2-h-z-energy.txt ----------------------------------------------------------------------------------------------- ___Figure 7 Simulated spectrum of transition radiation after 1 m propagation from the accelerator produced by a two-foil system with separation 16 cm and a single Gaussian electron bunch with the following characteristics: fig7_0.6um.txt E0 = 100 MeV, 3% energy spread, 2 mrad divergence, 0.6 um bunch length fig7_1.5mrad.txt E0 = 100 MeV, 3% energy spread, 1.5 mrad divergence, 0.3 um bunch length fig7_1es.txt E0 = 100 MeV, 1% energy spread, 2 mrad divergence, 0.3 um bunch length fig7_1es.txt E0 = 100 MeV, 3% energy spread, 2 mrad divergence, 0.3 um bunch length ---------------------------------------------------------------------------------------------- __Figure 8 Simulated spectrum of transition radiation after 1 m propagation from the accelerator produced by a two-foil system with separation 16 cm and a composite electron bunch with the following structure: Fig 8a (insets): OSIRIS simulations |Fig8a-simulation1-inset.txt |Fig8a-simulation2-inset.txt fig8_ex1_tr1.txt Two 100 MeV bunches separated by 11.5 ± 0.5 fs and with energy spread of 1%, charge of 8 pC and 3 pC and bunch length at the source of 0.9 fs fig8_ex1_tr2.txt Contains an additional 90 MeV bunch separated by 22 ± 2 fs from the first structure, 6% energy spread, 1.8 fs pulse duration and 0.5 pC charge fig8_ex1_tr3.txt Contains a fourth bunch separated by 45 ± 1 fs from the first structure, 3% energy spread, 1.8 fs pulse duration and 0.5 pC charge. fig8_experimental1.txt Spectrum of transition radiation measured experimentally showing at least two bunches. fig8_ex1_tr1.txt A 90 MeV bunch with energy spread of 6%, charge of 12 pC and bunch length at the source of 1.5 fs fig8_ex1_tr2.txt + A 90 MeV bunch with energy spread 3%, charge 0.5 pC, bunch length 0.9 fs and 55 fs delay fig8_ex1_tr3.txt + A 90 MeV bunch with energy spread 3%, charge 0.5 pC, bunch length 0.9 fs and 10 fs delay fig8_experimental2.txt Spectrum of transition radiation measured experimentally showing one bunch. ______________________________________________________________________________________________________