AI Article Synopsis
- Researchers investigated how high-intensity laser pulses propagate through a plasma channel by adjusting its length, successfully guiding 500 terawatt pulses over distances of 30 cm in hydrogen plasma.
- They observed the initial energy transfer involving higher-order modes and a transition to more efficient propagation, noting a depletion of laser energy that generates wakefields.
- Utilizing 21.3 joules of laser energy for localized electron injection, they achieved electron bunches with nearly monenergetic peaks reaching 9.2 GeV and total charge exceeding 10 GeV.
Article Abstract
We measure the high-intensity laser propagation throughout meter-scale, channel-guided laser-plasma accelerators by adjusting the length of the plasma channel on a shot-by-shot basis, showing high-quality guiding of 500 TW laser pulses over 30 cm in a hydrogen plasma of density n_{0}≈1×10^{17} cm^{-3}. We observed transverse energy transport of higher-order modes in the first ≈12 cm of the plasma channel, followed by quasimatched propagation, and the gradual, dark-current-free depletion of laser energy to the wake. We quantify the laser-to-wake transfer efficiency limitations of currently available petawatt-class lasers and demonstrate via simulation how control over the laser mode can significantly improve beam parameters. Using 21.3 J of laser energy, and triggering localized electron injection, we observed electron bunches with single, quasimonoenergetic peaks up to 9.2 GeV with charge extending beyond 10 GeV.
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