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强流脉冲离子束辐照后的材料表面状态对束流强度具有极高的敏感性. 因此, 在辐照实验中监测束流输出的稳定性, 并及时识别出参数抖动较大的脉冲, 对于实验结果的分析和表面改性效果的优化具有重要意义. 本文利用塑料闪烁体构建了一种时间分辨为6 ns的快响应脉冲X射线诊断系统, 成功捕获了外磁绝缘离子束二极管工作时产生的X射线. 同时, 通过红外相机和法拉第筒对离子束流的能量密度和电流密度进行测量. 分析结果显示, 轫致辐射强度和离子束发射强度均取决于二极管加速电压, 导致X射线强度和离子束流能量密度呈现正相关趋势. 当离子电流密度发生抖动时, X射线信号幅值表现出良好的变化跟随性, 能够对偏离预设参数区间的脉冲做出响应. 这说明本文提出的非拦截式诊断方法能够有效地实时监测强流脉冲离子束束流输出的稳定性.Intense pulsed ion beam (IPIB) technology has made remarkable progress in surface modification, mixing, polishing, film deposition, and nano powder synthesis in recent years. However, the surface properties of materials under IPIB irradiation are highly sensitive to beam intensity variations. Deviations from acceptable parameter range can change the surface characteristics and increase prevalence of defects. Consequently, the real-time online monitoring of beam stability during irradiation experiments and promptly identifying of pulses exhibiting significant parameter jitter are of significance in accurately analyzing results and optimizing surface modification. This study presents a fast-response pulse X-ray diagnostic system by employing EJ-200 plastic scintillator, 9266FLB photomultiplier tube, and Tektronic TDS 2024 four-channel oscilloscope. Single particle test demonstrates that the system achieves a time resolution of 6 ns, meeting the requirements for temporal response to detecting pulse X-ray signals with a half-width of ~80 ns. By adjusting the insulation magnetic field strength of the ion diode, the IPIB output level is regulated. The diagnostic system successfully captures X-rays emitted by the external magnetic insulated ion diode operating at different output levels. Simultaneously, the ion beam energy density is measured by using an infrared camera. To mitigate diagnostic errors stemming from target ablation, the maximum energy density is controlled to be below 1.32 J/cm2. Analysis results establish a positive correlation between X-ray intensity and ion beam energy density. This relationship arises from the influence of the insulating magnetic field adjustment on the diode's operating voltage, which subsequently affects the bremsstrahlung radiant intensity and ion beam emission intensity. This correlation offers the potential for the real-time monitoring of IPIB beam output stability by utilizing X-ray signals. To further corroborate the synchronized changes in pulse X-ray intensity and ion beam intensity, Faraday cup is employed as an alternative to infrared imaging method for measuring ion current density. Results demonstrate that the amplitude of the X-ray signal changes synchronously with fluctuations of ion current density. It is worth noting that when the output intensity of ion beam deviates significantly (more than 10% of the preset value), the diagnostic system will respond quickly. These findings validate the efficacy of the proposed non-interceptive diagnostic method of real-time monitoring the intense pulsed ion beam output stability.
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Keywords:
- intense pulsed ion beam /
- beam output stability /
- real-time monitoring /
- pulsed X-ray diagnostic system
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Chen B X, Zhang Z 2011 Nuclear Radiation Physics and Detection (Harbin: Harbin Engineering University Press) p146
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图 1 诊断方法示意图. 1-高压端柱; 2-阳极; 3-阳极托盘; 4-阴极; 5-阴极支撑盘; 6-电子; 7-离子束; 8-绝缘磁场线圈; 9-磁场线圈固定器; 10-有机玻璃观察窗; 11-CaF2窗口; 12-EJ-200塑料闪烁体; 13-9266 FLB光电倍增管
Fig. 1. Diagnostic method diagram. 1- High voltage input; 2-anode; 3- anode tray; 4-cathode; 5-cathode support plate; 6- electron; 7-ion beam; 8-insulated magnetic field coils; 9- magnetic field coils fixer; 10- organic glass observation window; 11-CaF2 window; 12-EJ-200 plastic scintillator; 13-9266 FLB photomultiplier tube.
图 3 红外相机在(a) IPIB辐照前、(b) IPIB辐照后从热沉靶背面捕获的红外图像, 以及(c)诊断系统捕获的脉冲X射线信号波形
Fig. 3. The infrared image captured by the infrared camera from the backside of the heat sink target before (a) IPIB irradiation, (b) after IPIB irradiation, and (c) the pulse X-ray signal waveform captured by the diagnostic system.
图 4 脉冲X射线信号幅值与IPIB束流能量密度之间的关系
Fig. 4. Relationship between the amplitude of pulse X-ray signal and the energy density of IPIB.
图 5 (a)轫致辐射产生示意图; (b)阳极结构实物图
Fig. 5. (a) Schematic diagram of bremsstrahlung generation; (b) picture of anode structure.
图 6 实验装置示意图. 1-高压端柱; 2-阳极; 3-阳极托盘; 4-阴极; 5-阴极支撑盘; 6-电子; 7-离子束; 8-绝缘磁场线圈; 9-磁场线圈固定器; 10-有机玻璃观察窗; 11-石墨收集体; 12-EJ-200塑料闪烁体; 13-9266 FLB光电倍增管
Fig. 6. Schematic diagram of experimental equipment. 1- High voltage input; 2-anode; 3- anode tray; 4-cathode; 5-cathode support plate; 6- electron; 7-ion beam; 8- insulated magnetic field coils; 9- magnetic field coils fixer; 10-organic glass observation window; 11-graphite collector; 12-EJ-200 plastic scintillator; 13-9266 FLB photomultiplier tube.
图 7 二极管电压、离子电流密度和X射线信号波形图
Fig. 7. Diode voltage, ion current density, and X-ray signal waveform.
图 8 X射线信号幅值与离子电流密度的对应关系
Fig. 8. Correspondence between X-ray signal amplitude and ion current density.
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Google Scholar
[2] Van Devender J P 1986 Plasma Phys. Control. Fusion 28 841
Google Scholar
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Google Scholar
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Liu Q Z 1994 Pulse Radiation Field Diagnosis Technology (Beijing: Science Press) p98
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Zheng Z P, Zhu Y C, Shao Y Y, Sun H S 1986 Nucl. Elec. and Det. Tech. 6 112
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Google Scholar
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Chen B X, Zhang Z 2011 Nuclear Radiation Physics and Detection (Harbin: Harbin Engineering University Press) p146
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