Use of capillary optics as a beam intensifier for a Compton x-ray source.
Use of capillary optics as a beam intensifier for a Compton x-ray source.
复制标题
使用毛细管光学器件作为康普顿 X 射线源的光束增强器。
DOI：
10.1118/1.597218
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发表时间：
1994
期刊：
影响因子：
3.8
通讯作者：
MacDonald,CA
中科院分区：
文献类型：
--
作者：
Tompkins,PA;Abreu,CC;Carroll,FE;Xiao,QF;MacDonald,CA
库马霍夫毛细管光学器件的使用将显着增强近单色康普顿背散射 X 射线程序的性能。范德比尔特大学医学自由电子激光中心正在开发为医学成像产生这些可调谐 X 射线的能力。目前的传输仅具有反射光学器件，并且实验室中的光束直径相当大。该光束的低损耗准直将允许传输后更高的 X 射线强度。本文描述了实验和计算机模拟结果，这些结果预测了用于 X 射线束传输的多光纤库马霍夫准直器的预期性能。我们的研究估计，由单个多毛细管纤维形成的多光纤可用于捕获完整的 7 mrad 范德比尔特 X 射线束，并将其准直至 1-2 mrad 发散，传输效率约为 40%-50%。该光学器件应通过减小光束发散度和随后的光斑尺寸，将实验室水平的 X 射线强度提高 ≥5 倍。此外，对融合多毛细管纤维的整体光学器件的分析预测，实验室中的 X 射线强度将增加 55 倍。这些光学器件可以具有锥形通道，从而大大降低其出射发散度。这将大大增强这种独特 X 射线源的功能。本文报告了范德比尔特大学、纽约州立大学奥尔巴尼大学 X 射线光学中心和纽约州奥尔巴尼 X 射线光学系统之间合作的初步结果。
The use of Kumakhov capillary optics will significantly enhance the performance of near‐monochromatic, Compton backscattered x‐ray programs. The Vanderbilt University Medical Free‐Electron Laser Center is developing the capability to create these tunable x rays for medical imaging. The present transport has only reflection optics, and the beam is quite large in diameter at the laboratory. Low loss collimation of this beam would allow higher x‐ray intensities after transport. This article describes experimental and computer simulation results which predict the expected performance for a multifiber Kumakhov collimator for use in the x‐ray beam transport. Estimates from our research are that a multifiber optic formed of individual polycapillary fibers could be used to capture the full 7 mrad of the Vanderbilt x‐ray beam and collimate it to a 1–2 mrad divergence with approximately 40%–50% transmission efficiency. This optic should increase the x‐ray intensity at the laboratory level by a factor of ≥5 by decreasing the beam divergence and subsequent spot size. Additionally, analysis of monolithic optics of fused multicapillary fibers predicts an increase in the intensity of the x rays at the laboratory by a factor of 55. These optics can have tapered channels that greatly decrease their exit divergence. This will greatly enhance the capabilities of this unique x‐ray source. This article reports the initial results from a collaboration between Vanderbilt, The Center for X‐Ray Optics at University at Albany, SUNY, and X‐Ray Optical Systems in Albany, NY.