Effect of the laser focus position on characteristics of X-ray and ion emission from gold plasmas generated by a sub-nanosecond laser

被引：2
作者：
Chaurasia, S. [1 ]
Munda, D. S. [1 ]
Tripathi, S. [1 ]
Gupta, N. K. [1 ]
Dhareshwar, L. J. [1 ]
Tallents, G. J. [2 ]
机构：
[1] Bhabha Atom Res Ctr, Laser & Neutron Phys Sect, Mumbai 400085, Maharashtra, India
[2] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2009年 / 267卷 / 23-24期
关键词：
Pinhole camera; Volume effect; X-ray yield; CHARGED HEAVY-IONS; IODINE LASER; ELEMENTS; TARGETS; PULSES;
D O I：
10.1016/j.nimb.2009.09.030
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
X-ray and ion emission from gold plasma produced by a sub-nanosecond Nd:glass laser has been studies as a function of distance of the target from the best focus position. Thermal ion (kinetic energy <19 keV) signals and soft X-ray flux (photon energy >0.7 keV) measurements decrease as the target is moved closer to the best focus position in spite of an increase in laser intensity. We observe simultaneously a strong correlation between the onset of this drop in the flux of soft X-ray and the growth of harder X-ray (photon energy 3-5 keV), alongside a growth in fast ion (energy >67 keV) numbers. This is indicative of the onset of non-linear processes at the higher irradiances (similar to 10(14) W/cm(2)) associated with the best focus position. Our results show that when using laser plasmas as X-ray or ion sources, X-ray and ion emission in a desired spectral range can be optimized by adjusting the focusing on the target. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：3611 / 3616
页数：6
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