High resolution Thomson Parabola Spectrometer for full spectral capture of multi-species ion beams.
High resolution Thomson Parabola Spectrometer for full spectral capture of multi-species ion beams.
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DOI：
10.1063/1.4961028
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发表时间：
2016-08
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通讯作者：
A. Alejo;S. Kar;A. Tebartz;H. Ahmed;S. Astbury;David Carroll;J. Ding;Domenico Doria;A. Higginson;Paul McKenna;N. Neumann;G. Scott;F. Wagner;Markus Roth;M. Borghesi
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作者：
A. Alejo;S. Kar;A. Tebartz;H. Ahmed;S. Astbury;David Carroll;J. Ding;Domenico Doria;A. Higginson;Paul McKenna;N. Neumann;G. Scott;F. Wagner;Markus Roth;M. Borghesi
我们报告的实验特性的激光驱动的离子束使用汤姆逊抛物线光谱仪（TPS）配备了螺旋形的电板，提出了Gwynne等人。仪器。85，033304（2014）]。虽然一对延伸的（30厘米长）的电板能够产生一个显着增加在高能量的相邻离子物种之间的分离，部署梯形设计规避了在离子光谱的低能量端的光谱削波。对于给定的光谱仪配置，仔细考虑可检测的离子能量和种类的范围来选择电板的形状。分析跟踪的离子抛物线匹配密切与实验数据，这表明边缘场的逃逸离子接近的楔形边缘的电极上的影响最小。分析公式推导考虑到相对论修正所需的高能离子使用这种谱仪进行表征。
We report on the experimental characterisation of laser-driven ion beams using a Thomson Parabola Spectrometer (TPS) equipped with trapezoidally shaped electric plates, proposed by Gwynne et al. [Rev. Sci. Instrum. 85, 033304 (2014)]. While a pair of extended (30 cm long) electric plates was able to produce a significant increase in the separation between neighbouring ion species at high energies, deploying a trapezoidal design circumvented the spectral clipping at the low energy end of the ion spectra. The shape of the electric plate was chosen carefully considering, for the given spectrometer configuration, the range of detectable ion energies and species. Analytical tracing of the ion parabolas matches closely with the experimental data, which suggests a minimal effect of fringe fields on the escaping ions close to the wedged edge of the electrode. The analytical formulae were derived considering the relativistic correction required for the high energy ions to be characterised using such spectrometer.