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Cold electrons acceleration in TNSA laser‐generated plasma using a low‐contrast fs laser
Contributions to Plasma Physics ( IF 1.6 ) Pub Date : 2021-01-12 , DOI: 10.1002/ctpp.202000097 L. Torrisi 1 , M. Cutroneo 2 , A. Torrisi 2
Contributions to Plasma Physics ( IF 1.6 ) Pub Date : 2021-01-12 , DOI: 10.1002/ctpp.202000097 L. Torrisi 1 , M. Cutroneo 2 , A. Torrisi 2
Affiliation
The fs laser facility in Bordeaux, delivering an intensity of 1018 W/cm2 at normal incidence on thin foils, has been used to induce forward electron and ion acceleration in target‐normal‐sheath‐acceleration (TNSA) regime. Micrometric thin foils with different composition, thickness, and electron density, were prepared to promote the charge particle acceleration in the forward direction. The plasma electron and ion emission monitoring were performed on‐line using SiC semiconductor detectors in time‐of‐flight (TOF) configuration and gaf‐chromics films both covered by thin absorber filters. The experiment has permitted to accelerate electrons and protons. A special attention was placed to detect relativistic hot electrons escaping from the plasma and cold electrons returning to the target position. The electron energies of the order of 100 keV and of about 1 keV were detected as representative of hot and cold electrons, respectively. A high cold electron contribution was measured using low‐contrast fs laser, while it is less evident using high‐contrast fs lasers. The charge particle acceleration depends on the laser parameters, irradiation conditions, and target properties, as will be presented and discussed.
中文翻译:
低对比度fs激光在TNSA激光产生的等离子体中的冷电子加速
波尔多的fs激光设备在薄箔上的法向入射强度为10 18 W / cm 2,已被用来在目标法向皮层加速度(TNSA)情况下引起正向电子和离子加速。制备了具有不同组成,厚度和电子密度的微米级薄箔,以促进电荷粒子在向前方向上的加速。等离子体电子和离子发射监测进行上线在飞行时间(TOF)配置中使用SiC半导体探测器,以及均被薄吸收器滤光片覆盖的Gaf变色膜。实验允许加速电子和质子。特别注意检测从等离子体逸出的相对论热电子,以及返回目标位置的冷电子。检测到分别为100 keV和约1 keV的电子能量分别代表热电子和冷电子。使用低对比度fs激光器测量了较高的冷电子贡献,而使用高对比度fs激光器则不太明显。电荷粒子的加速度取决于激光参数,辐照条件和目标特性,这将在本文中进行介绍和讨论。
更新日期:2021-01-12
中文翻译:
低对比度fs激光在TNSA激光产生的等离子体中的冷电子加速
波尔多的fs激光设备在薄箔上的法向入射强度为10 18 W / cm 2,已被用来在目标法向皮层加速度(TNSA)情况下引起正向电子和离子加速。制备了具有不同组成,厚度和电子密度的微米级薄箔,以促进电荷粒子在向前方向上的加速。等离子体电子和离子发射监测进行上线在飞行时间(TOF)配置中使用SiC半导体探测器,以及均被薄吸收器滤光片覆盖的Gaf变色膜。实验允许加速电子和质子。特别注意检测从等离子体逸出的相对论热电子,以及返回目标位置的冷电子。检测到分别为100 keV和约1 keV的电子能量分别代表热电子和冷电子。使用低对比度fs激光器测量了较高的冷电子贡献,而使用高对比度fs激光器则不太明显。电荷粒子的加速度取决于激光参数,辐照条件和目标特性,这将在本文中进行介绍和讨论。