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首页> 外文期刊>Life Sciences in Space Research >Reference field specification and preliminary beam selection strategy for accelerator-based GCR simulation
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Reference field specification and preliminary beam selection strategy for accelerator-based GCR simulation

机译：基于加速器的GCR仿真的参考场规范和初步光束选择策略

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The galactic cosmic ray (GCR) simulator at the NASA Space Radiation Laboratory (NSRL) is intended to deliver the broad spectrum of particles and energies encountered in deep space to biological targets in a controlled laboratory setting. In this work, certain aspects of simulating the GCR environment in the laboratory are discussed. Reference field specification and beam selection strategies at NSRL are the main focus, but the analysis presented herein may be modified for other facilities and possible biological considerations. First, comparisons are made between direct simulation of the external, free space GCR field and simulation of the induced tissue field behind shielding. It is found that upper energy constraints at NSRL limit the ability to simulate the external, free space field directly (i.e. shielding placed in the beam line in front of a biological target and exposed to a free space spectrum). Second, variation in the induced tissue field associated with shielding configuration and solar activity is addressed. It is found that the observed variation is likely within the uncertainty associated with representing any GCR reference field with discrete ion beams in the laboratory, given current facility constraints. A single reference field for deep space missions is subsequently identified. Third, a preliminary approach for selecting beams at NSRL to simulate the designated reference field is presented. This approach is not a final design for the GCR simulator, but rather a single step within a broader design strategy. It is shown that the beam selection methodology is tied directly to the reference environment, allows facility constraints to be incorporated, and may be adjusted to account for additional constraints imposed by biological or animal care considerations. The major biology questions are not addressed herein but are discussed in a companion paper published in the present issue of this journal. Drawbacks of the proposed methodology are discussed and weighed against alternative simulation strategies.
机译：NASA太空辐射实验室（NSRL）的银河宇宙射线（GCR）模拟器旨在将深空遇到的广谱粒子和能量传递到受控实验室环境中的生物目标。在这项工作中，讨论了在实验室中模拟GCR环境的某些方面。 NSRL的参考场规范和波束选择策略是主要重点，但本文介绍的分析可能会因其他设施和可能的生物学考虑而修改。首先，在外部自由空间GCR场的直接仿真与屏蔽后的诱导组织场的仿真之间进行比较。已经发现，NSRL的较高能量限制限制了直接模拟外部自由空间场的能力（即，将屏蔽物放置在生物目标前面的光束线中并暴露于自由空间光谱中）。其次，解决了与屏蔽结构和太阳活动有关的诱导组织场的变化。发现在给定当前设施限制的情况下，观察到的变化很可能在不确定性内，该不确定性与在实验室中用离散离子束表示任何GCR参考场有关。随后确定了深空任务的单一参考领域。第三，提出了一种在NSRL处选择光束以模拟指定参考场的初步方法。这种方法不是GCR模拟器的最终设计，而是更广泛的设计策略中的一步。结果表明，光束选择方法直接与参考环境相关联，允许纳入设施限制条件，并且可以进行调整以考虑到生物学或动物护理方面的限制条件。主要的生物学问题在这里没有解决，但是在本期杂志上发表的同伴论文中进行了讨论。讨论了所提出方法的缺点，并权衡了替代仿真策略。

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