A proton point source produced by laser interaction with cone-top-end target

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• 作者：Jinqing Yu^a ; ^b ; Xiaolin Jin^a ; Weimin Zhou^b ; Zongqing Zhao^b ; Yonghong Yan^b ; Bin Li^a ; Wei Hong^b ; Yuqiu Gu^b ; ^{yqgu@caep.ac.cn}
• 关键词：Proton point source ; Cone-top-end target ; Particle-in-cell simulations ; Proton acceleration
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2012
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：21 August, 2012
• 卷：684
• 期：Complete
• 页码：88-92
• 文件大小：864 K

摘要

In this paper, we propose a proton point source by the interaction of laser and cone-top-end target and investigate it by two-dimensional particle-in-cell (2D-PIC) simulations as the proton point sources are well known for higher spatial resolution of proton radiography. Our results show that the relativistic electrons are guided to the rear of the cone-top-end target by the electrostatic charge-separation field and self-generated magnetic field along the profile of the target. As a result, the peak magnitude of sheath field at the rear surface of cone-top-end target is higher compared to common cone target. We test this scheme by 2D-PIC simulation and find the result has a diameter of 0.79位₀, an average energy of 9.1 MeV and energy spread less than 35%.