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Spectral modification of laser-accelerated proton beams by self-generated magnetic fields

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Figure

Figure 1. Proton energy spectra obtained from Thomson parabola spectrometer:(a) typical spectrum from a 6 µm target, (b) spectrum obtained from 50 nm Altarget with type I peak, (c) spectrum obtained from 50 nm CH target with type IIpeak and (d) spectrum obtained from 200 nm Al target with type I peak.
Figure 2. Proton energy spectra obtained from Thomson parabola spectrometer.Top row: the five spectra obtained from 50 nm CH targets that exhibited atype II peak
Figure 3. Proton energy spectra obtained from Thomson parabola spectrometer:all 16 shots from 50 nm Al targets that produced type I spectra.
Figure 4. Proton energy spectra from 2D PIC simulations at 200 fs: (a) spectrumfrom 80 nm ‘Al’ foil simulation of protons travelling at <0.5 mrad to targetnormal, (b) spectrum from 80 nm ‘CH’ foil simulation of protons travelling at<0.5 mrad to target normal, (c) spectrum from 80 nm ‘Al’ foil simulation of allprotons and (d) spectrum from 80 nm ‘CH’ foil of all protons.
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