An 800-MeV proton radiography facility for dynamic experiments
An 800-MeV proton radiography facility for dynamic experiments
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DOI：
10.1016/s0168-9002(98)01241-8
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发表时间：
1999-03-11
影响因子：
1.4
通讯作者：
Zumbro, JD
中科院分区：
文献类型：
--
作者：
King, NSP;Ables, E;Zumbro, JD
洛斯阿拉莫斯核科学中心（LANSCE）已经成功地开发了利用空间和时间准备的800 MeV质子束产生质子射线照片的能力。一系列的质子爆发通过一个动态的对象传输，并通过一个独特的磁透镜系统，传输到一个图像平面。磁透镜系统允许校正多次库仑散射的影响，否则多次库仑散射将使图像平面处的空间传输信息完全模糊。质子射线照片记录在时间积分胶片上或用最近开发的多帧电子成像相机系统。后一种技术允许获得时间依赖性的质子射线照片系列，其时间间隔（模358 ns）高达许多微秒，并且图像之间的时间间隔可变。每个图像需要一个电子快门，增强，CCD相机。这些相机可以检测单个质子与成像平面中的反射光纤阵列相互作用，但也具有动态范围，其允许记录具有优于5%统计数据的射线照片，用于观察对象中的详细密度变化。已经进行了一些测试来表征质子射线照相系统的绝对质量测定、分辨率和动态范围的质量。最初的动态实验的特点的冲击波传播的时间和空间的行为在一个高爆炸性的样品，每个实验多达六个图像。根据原型系统的经验，正在进行一些升级，包括通过微分多库仑散射射线照片和改进成像技术的更多图像来增强质量鉴别的预期能力。(C)1999年由Elsevier Science B.V.出版，版权所有。
The capability has successfully been developed at the Los Alamos Nuclear Science Center (LANSCE) to utilize a spatially and temporally prepared 800 MeV proton beam to produce proton radiographs. A series of proton bursts are transmitted through a dynamic object and transported, via a unique magnetic lens system, to an image plane. The magnetic lens system permits correcting for the effects of multiple coulomb scattering which would otherwise completely blur the spatially transmitted information at the image plane. The proton radiographs are recorded either on a time integrating film plate or with a recently developed multi-frame electronic imaging camera system. The latter technique permits obtaining a time dependent series of proton radiographs with time intervals (modulo 358 ns) up to many microseconds and variable time intervals between images. One electronically shuttered, intensified, CCD camera is required per image. These cameras can detect single protons interacting with a scintillating fiber optic array in the image plane but also have a dynamic range which permits recording radiographs with better than 5% statistics for observation of detailed density variations in the object. A number of tests have been carried out to characterize the quality of the proton radiography system for absolute mass determination, resolution, and dynamic range. Initial dynamic experiments characterized the temporal and spatial behavior of shock propagation in a high explosive sample with up to six images per experiment. Based on experience with the prototype system, a number of upgrades an being implemented including the anticipated capability for enhanced mass discrimination through differential multiple coulomb scattering radiographs and more images with improved imaging techniques. (C) 1999 Published by Elsevier Science B.V. All rights reserved.