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内容記述 |
We present recent progress on generating quasi-monoenergetic deuterons using the petawatt LFEX laser. A key development is our in-situ fabrication of D2O-deposited targets within the laser chamber, using heavy water capsules to form nanometer-thick D2O layers on metal surfaces. These targets enabled quasi-monoenergetic deuteron pulses (ΔE/E = 4.6%) via the Target Normal Sheath Acceleration (TNSA) mechanism, though the energy peaked at ~11 MeV due to proton influence on beam structure. To overcome this limit, we introduced a novel mechanism, boosted Coulomb explosion, triggered by a standing wave in pre-expanded plasma. This stading wave results from the interference of the incident laser and its reflection from a solid target, enhancing deuteron acceleration. Using this method, we achieved quasi-monoenergetic deuterons with energies up to 50 MeV from the target front side. Moreover, the deuteron peak energy is shown to be tunable via laser pulse duration. |
