M Cufari, N Vanderloo, B I Buschmann, A DeVault, B C Foo, J Vargas, S G Dannhoff, T E Evans, T M Johnson, J Kunimune, Y Lawrence, J A Pearcy, B L Reichelt, L Russell, C W Wink, M Gatu Johnson, R D Petrasso, J A Frenje
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引用次数: 0
摘要
成像板(IP)或荧光粉存储屏是惯性约束聚变(ICF)和高能量密度等离子体(HEDP)诊断中经常使用的一种技术,因为它们对多种类型的辐射(包括 X 射线、质子、阿尔法粒子、β 粒子和中子)非常敏感。之前对 IPs 特征的研究是以信号水平保持在扫描仪饱和阈值以下为前提的。由于扫描过程会通过光刺激发光从 IP 中去除一些信号,因此反复扫描 IP 会使信号水平低于扫描仪饱和阈值。这一过程反过来又引起了人们对 IP 在任意扫描次数后的信号响应的关注,以及这一过程是否会产生(例如)第 n 次和 n + 1 次扫描之间的恒定信号比。在此,我们研究了 IP 在多次扫描时的灵敏度。结果表明,信号衰减比并不是扫描次数的常数,信号衰减取决于 X 射线能量。因此,用混合信号类型(如 X 射线、中子和质子)对 IP 进行重复扫描,可使采用 IP 的 ICF 和 HEDP 诊断更好地隔离特定信号类型。
Characterization of the image plate multi-scan response to mono-energetic x-rays.
Image plates (IPs), or phosphor storage screens, are a technology employed frequently in inertial confinement fusion (ICF) and high energy density plasma (HEDP) diagnostics because of their sensitivity to many types of radiation, including, x rays, protons, alphas, beta particles, and neutrons. Prior studies characterizing IPs are predicated on the signal level remaining below the scanner saturation threshold. Since the scanning process removes some signal from the IP via photostimulated luminescence, repeatedly scanning an IP can bring the signal level below the scanner saturation threshold. This process, in turn, raises concerns about the signal response of IPs after an arbitrary number of scans and whether such a process yields, for example, a constant ratio of signal between the nth and n + 1st scan. Here, the sensitivity of IPs is investigated when scanned multiple times. It is demonstrated that the ratio of signal decay is not a constant with the number of scans and that the signal decay depends on the x-ray energy. As such, repeatedly scanning an IP with a mixture of signal types (e.g., x ray, neutron, and protons) enables ICF and HEDP diagnostics employing IPs to better isolate a particular signal type.
期刊介绍:
Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.