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Nuclear Fusion Effects Induced in Intense LaserGenerated Plasmas

机译:强激光产生等离子体诱导的核融合效应

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摘要

Deutered polyethylene (CD2)n thin and thick targets were irradiated in high vacuum by infrared laser pulses at 1015W/cm2 intensity. The high laser energy transferred to the polymer generates plasma, expanding in vacuum at supersonic velocity, accelerating hydrogen and carbon ions. Deuterium ions at kinetic energies above 4 MeV have been measured by using ion collectors and SiC detectors in time-of-flight configuration. At these energies the deuterium–deuterium collisions may induce over threshold fusion effects, in agreement with the high D-D cross-section valuesaround 3 MeV energy. At the first instants of the plasma generation, during which high temperature, density and ionacceleration occur, the D-D fusions occur as confirmed by the detection of mono-energetic protonsand neutrons with a kinetic energy of 3.0 MeV and 2.5 MeV, respectively, produced by the nuclear reaction. The number of fusion events depends strongly on the experimental set-up, i.e. on the laser parameters (intensity, wavelength, focal spot dimension), target conditions (thickness, chemical composition, absorption coefficient, presence of secondary targets) and used geometry (incidence angle, laser spot, secondary target positions).A number of D-D fusion events of the order of 106÷7 per laser shot has been measured.
机译:用1015W / cm2强度的红外激光脉冲在高真空下辐照氘化的聚乙烯(CD2)n薄和厚的靶材。转移到聚合物上的高激光能量产生等离子体,在真空中以超音速膨胀,从而加速氢和碳离子。通过使用飞行时间配置中的离子收集器和SiC检测器测量了动能高于4 MeV的氘离子。在这些能量下,氘与氘的碰撞可能会引起超过阈值的融合效应,这与3 MeV能量附近的高D-D横截面值一致。在产生等离子体的最初瞬间,即发生高温,高密度和离子加速的过程中,DD融合发生,这是由检测到的单能质子和中子的动能分别为3.0 MeV和2.5 MeV所证实的。核反应。融合事件的数量在很大程度上取决于实验装置,即取决于激光参数(强度,波长,焦斑尺寸),目标条件(厚度,化学成分,吸收系数,次要目标的存在)和使用的几何形状(入射)角度,激光光斑,次要目标位置)。已经测量了每激光发射数量级为106÷7的DD融合事件。

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