REG: High Sensitivity, High Speed Streak Camera System for Intense Pulsed Ion Beam Research

这项工程研究设备补助金提供了购买高速、高灵敏度图像转换器条纹相机系统的资金，该系统将主要用于强离子束研究。利用加速或漂移离子发出的可见光，或高能离子与物质(如闪烁体)相互作用产生的光，研究高功率脉冲加速间隙和强离子束传播的物理学。条纹相机系统以亚纳秒的时间分辨率和亚毫米的空间分辨率收集作为位置和时间函数的光强度数据，具有足够的灵敏度，可以测试几种新的诊断技术，以及以前使用的那些得到改进的技术。前一类中的一个例子是利用加速离子对可调谐染料激光的多普勒频移共振吸收来确定作为离子束加速间隙中位置的函数的静电势的技术。在后一类实验中，通过将条纹相机耦合到光谱仪的输出并监测特殊选择的离子发射线的斯塔克移动线轮廓，来测量加速间隙中的电场与位置的关系。在这种情况下，来自条纹相机的强度-位置-时间数据将变成强度-波长-时间。同样，通过监测适当发射线的多普勒宽度，可以测量加速间隙和传播区域中的离子横向速度随位置和时间的变化。这些测量将提高对强离子束源和传播离子束物理学的理解，进而提高为科学和工程中的特定应用定制束源的能力，例如材料表面修改和惯性约束聚变。

This Engineering Research Equipment Grant provides funds for purchase of high speed, high sensitivity image converter streak camera system which will be used principally for intense ion beam research. The physics of high power pulsed accelerating gaps and intense ion beam propagation will be investigated using visible light emitted by accelerating or drifting ions, or light which results from the energetic ions interacting with matter (such as a scintillator). The streak camera system collects light intensity data as a function of position and time with subnanosecond temporal resolution and submillimeter spatial resolution, with sufficient sensitivity to allow several new diagnostic techniques to be tested, and previously used ones to be improved. An example in the former category is a technique to determine the electrostatic potential as a function of position in an ion-beam accelerating gap using Doppler shifted resonance absorption of tunable dye laser light by the accelerating ions. In the latter category is an experiment to measure the electric field vs position in the accelerating gap by coupling the streak camera to the output of a spectrometer and monitoring the Stark shifted line profile of specially selected ion emission lines. In that case, the intensity vs position vs time data from the streak camera will become intensity vs wavelength vs time. Similarly, ion transverse velocities vs position and time both in an accelerating gap and in a propagation region can be measured by monitoring the Doppler width of appropriate emission lines. An improved understanding of the physics of intense ion beam sources and of propagating ion beams will come from these measurements which will, in turn, improve the ability to customize beam sources for particular applications in science and engineering, such as materials surface modification and inertial confinement fusion.