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Investigation of magnetic inhibition effect on ion acceleration at high laser intensities
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作者 H.Huang Z.M.Zhang +6 位作者 B.Zhang w.hong S.K.He L.B.Meng W.Qi B.Cui W.M.Zhoua 《Matter and Radiation at Extremes》 SCIE CAS CSCD 2021年第4期1-9,共9页
The irradiation of a target with high laser intensity can lead to self-generation of an intense magnetic field(B-field)on the target surface.It has therefore been suggested that the sheath-driven acceleration of high-... The irradiation of a target with high laser intensity can lead to self-generation of an intense magnetic field(B-field)on the target surface.It has therefore been suggested that the sheath-driven acceleration of high-energy protons would be significantly hampered by the magnetization effect of this self-generated B-field at high enough laser intensities.In this paper,particle-in-cell simulations are used to study this magnetization effect on sheath-driven proton acceleration.It is shown that the inhibitory effect of the B-field on ion acceleration is not as significant as previously thought.Moreover,it is shown that the magnetization effect plays a relatively limited role in high-energy proton acceleration,even at high laser intensities when the mutual coupling and competition between self-generated electric(E-)and B-fields are considered in a realistic sheath acceleration scenario.A theoretical model including the v 3 B force is presented and confirms that the rate of reduction in proton energy depends on the strength ratio between B-and E-fields rather than on the strength of the B-field alone,and that only a small percentage of the proton energy is affected by the self-generated B-field.Finally,it is shown that the degraded scaling of proton energy at high laser intensities can be explained by the decrease in acceleration time caused by the increased sheath fields at high laser intensities rather than by the magnetic inhibitory effect,because of the longer growth time scale of the latter.This understanding of the magnetization effect may pave the way to the generation of high-energy protons by sheath-driven acceleration at high laser intensities. 展开更多
关键词 field. ACCELERATION effect
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利用抗降解剂提高轮胎耐屈挠疲劳和耐动态臭氧龟裂性能
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作者 Sung w.hong 周碧蓉 《轮胎研究与开发》 2001年第3期21-28,共8页
轮胎制造商不断努力地试图取得良好的轮胎使用性能,使自己的产品在竞争中处于优势,生产寿命长且耐用的轮胎或重量轻的轮胎不仅可以降低轮胎成本,还可以降低滚动阻力。为了达到这一目的,抗降解剂是赋予轮胎卓越使用性能的必备因素。
关键词 轮胎 耐屈挠疲劳 耐动态臭氧龟裂 性能 抗降解剂
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