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

页码：3611 / 3616

页数：6

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