Monoenergetic proton beam accelerated by single reflection mechanism only during hole-boring stage

Wenpeng Wang; Cheng Jiang; Shasha Li; Hao Dong; Baifei Shen; Yuxin Leng; Ruxin Li; Zhizhan Xu

doi:10.1017/hpl.2019.40

Journals >High Power Laser Science and Engineering >Volume 7 >Issue 3 >Page 03000e55 > Article

High Power Laser Science and Engineering
Vol. 7, Issue 3, 03000e55 (2019)

Monoenergetic proton beam accelerated by single reflection mechanism only during hole-boring stage

Wenpeng Wang^1、†, Cheng Jiang¹, Shasha Li¹, Hao Dong¹, Baifei Shen², Yuxin Leng¹, Ruxin Li¹, and Zhizhan Xu¹

Author Affiliations

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Department of Physics, Shanghai Normal University, Shanghai 200234, China

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DOI: 10.1017/hpl.2019.40 Cite this Article Set citation alerts

Wenpeng Wang, Cheng Jiang, Shasha Li, Hao Dong, Baifei Shen, Yuxin Leng, Ruxin Li, Zhizhan Xu. Monoenergetic proton beam accelerated by single reflection mechanism only during hole-boring stage[J]. High Power Laser Science and Engineering, 2019, 7(3): 03000e55 Copy Citation Text

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Abstract

Multidimensional instabilities always develop with time during the process of radiation pressure acceleration, and are detrimental to the generation of monoenergetic proton beams. In this paper, a sharp-front laser is proposed to irradiate a triple-layer target (the proton layer is set between two carbon ion layers) and studied in theory and simulations. It is found that the thin proton layer can be accelerated once to hundreds of MeV with monoenergetic spectra only during the hole-boring (HB) stage. The carbon ions move behind the proton layer in the light-sail (LS) stage, which can shield any further interaction between the rear part of the laser and the proton layer. In this way, proton beam instabilities can be reduced to a certain extent during the entire acceleration process. It is hoped such a mechanism can provide a feasible way to improve the beam quality for proton therapy and other applications.

Keywords

hole-boring stage light-sail stage proton acceleration radiation acceleration sharp-front laser

$$\begin{eqnarray}2a^{2}(1-v_{\text{CEL}})/(1+v_{\text{CEL}})=2(\unicode[STIX]{x1D70B}n_{0}v_{\text{CEL}}t)^{2},\end{eqnarray}$$

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$$\begin{eqnarray}\displaystyle v_{\text{CEL}} & = & \displaystyle \frac{1-3\unicode[STIX]{x1D705}^{2}}{3+3\unicode[STIX]{x1D705}^{2}}+\sqrt[3]{M+\sqrt{M^{2}+N^{3}}}\nonumber\\ \displaystyle & & \displaystyle +\,\sqrt[3]{M-\sqrt{M^{2}+N^{3}}},\end{eqnarray}$$

(2)

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$$\begin{eqnarray}\displaystyle v_{\text{p}}\left(t+\text{d}t\right)=\frac{4\unicode[STIX]{x1D70B}^{2}n_{0}x\left(t\right)}{m_{\text{p}}\unicode[STIX]{x1D6FE}_{\text{p}}\left(t\right)}\,\text{d}t+v_{\text{p}}\left(t\right), & & \displaystyle\end{eqnarray}$$

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$$\begin{eqnarray}\displaystyle x_{\text{p}}\left(t+\text{d}t\right)=\frac{2\unicode[STIX]{x1D70B}^{2}n_{0}x\left(t\right)}{m_{\text{p}}\unicode[STIX]{x1D6FE}_{\text{p}}\left(t\right)}\left(\text{d}t\right)^{2}+v_{\text{p}}\left(t\right)\text{d}t+x_{\text{p}}\left(t\right).\quad & & \displaystyle\end{eqnarray}$$

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$$\begin{eqnarray}\displaystyle a_{0}/t_{\text{up}}=\unicode[STIX]{x1D70B}n_{0}v_{\text{CEL}}(1+v_{\text{CEL}})^{1/2}(1-v_{\text{CEL}})^{-3/2}. & & \displaystyle\end{eqnarray}$$

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