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Production and Processing of the Radionuclide 76Br 生产和加工放射性核素 76Br
Q3 Physics and Astronomy Pub Date : 2024-03-13 DOI: 10.3390/instruments8010022
Karsten Franke, Jann Schöngart, Alexander Mansel
Four-dimensional visualization, i.e., three-dimensional space plus time, of fluid flow and its interactions in geological materials using positron emission tomography (PET) requires suitable radiotracers that exhibit the desired physicochemical interactions. 76Br is a likely candidate as a conservative tracer in these studies. [76Se]CoSe was produced and used as the target material for the production of 76Br via the (p,n) reaction at a Cyclone 18/9 cyclotron. 76Br was separated from the target by thermochromatographic distillation using a semi-automated system, combining a quartz glass apparatus with a synthesis module. 76Br was successfully produced at the cyclotron with a physical yield of 72 MBq/µAh (EOB). The total radiochemical yield of 76Br from the irradiated [76Se]CoSe target (EOS) was 68.6%. A total of 40 MBq–100 MBq n.c.a. 76Br were routinely prepared for PET experiments in 3 mL 20 mM Cl− solution. The spatial resolution of a PET scan with 76Br in geological materials was determined to be about 5 mm. The established procedure enables the routine investigation of hydrodynamics by PET techniques in geological materials that strongly sorb commonly used PET tracers such as 18F.
利用正电子发射断层扫描(PET)对地质材料中的流体流动及其相互作用进行四维可视化(即三维空间加时间),需要合适的放射性示踪剂来显示所需的物理化学相互作用。76Br 有可能成为这些研究中的保守示踪剂。[76Se]CoSe是在Cyclone 18/9回旋加速器上通过(p,n)反应生产出来的,并用作生产76Br的靶材料。76Br 通过热色谱蒸馏从靶材中分离出来,使用的是半自动系统,结合了石英玻璃装置和合成模块。回旋加速器成功生产出了 76Br,物理产率为 72 MBq/µAh(EOB)。经辐照的[76Se]CoSe 靶件(EOS)的 76Br 总放射化学收率为 68.6%。在 3 mL 20 mM Cl- 溶液中为 PET 实验常规制备了总量为 40 MBq-100 MBq n.c.a. 的 76Br。地质材料中 76Br PET 扫描的空间分辨率约为 5 毫米。既定程序使 PET 技术能够在 18F 等常用 PET 示踪剂吸附性很强的地质材料中对流体力学进行常规研究。
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引用次数: 0
Analysis of Near-Field Magnetic Responses on ZrTe5 through Cryogenic Magneto-THz Nano-Imaging 通过低温磁-THz 纳米成像分析 ZrTe5 上的近场磁响应
Q3 Physics and Astronomy Pub Date : 2024-03-05 DOI: 10.3390/instruments8010021
S. Haeuser, R. Kim, Joong-Mok Park, Randall K. Chan, M. Imran, T. Koschny, Jigang Wang
One manifestation of light-Weyl fermion interaction is the emergence of chiral magnetic effects under magnetic fields. Probing real space magnetic responses at terahertz (THz) scales is challenging but highly desired, as the local responses are less affected by the topologically trivial inhomogeneity that is ubiquitous in spatially averaged measurements. Here, we implement a cryogenic THz microscopy instrument under a magnetic field environment—a task only recently achieved. We explore the technical approach of this system and characterize the magnetic field’s influence on our AFM operation by statistical noise analysis. We find evidence for local near-field spatial variations in the topological semimetal ZrTe5 up to a 5-Tesla magnetic field and obtain near-field THz spectra to discuss their implications for future studies on the chiral magnetic effect.
光-韦尔费米子相互作用的一种表现形式是在磁场下出现手性磁效应。在太赫兹(THz)尺度上探测真实空间的磁响应具有挑战性,但也是人们非常渴望的,因为局部响应受拓扑琐碎不均匀性的影响较小,而这种不均匀性在空间平均测量中无处不在。在这里,我们实现了磁场环境下的低温太赫兹显微镜仪器--这是最近才实现的任务。我们探索了该系统的技术方法,并通过统计噪声分析描述了磁场对原子力显微镜操作的影响。我们发现了拓扑半金属 ZrTe5 在 5 特斯拉磁场下局部近场空间变化的证据,并获得了近场太赫兹光谱,讨论了其对未来手性磁效应研究的影响。
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引用次数: 0
Scattering Polarimetry in the Hard X-ray Range 硬 X 射线范围内的散射极性测量法
Q3 Physics and Astronomy Pub Date : 2024-03-02 DOI: 10.3390/instruments8010020
E. Costa
In one and a half years, the Imaging X-ray Polarimetry Explorer has demonstrated the role and the potentiality of Polarimetry in X-ray Astronomy. The next steps include extension to higher energies. There is margin for an extension of the photoelectric approach up to 20–25 keV, but above that energy the only technique is Compton Scattering. Grazing incidence optics can focus photons up to 80 keV, not excluding a marginal extension to 150–200 keV. Given the physical constraints involved, the passage from photoelectric to scattering approach can make less effective the use of optics because of the high background. I discuss the choices in terms of detector design to mitigate the problem and the guidelines for future technological developments.
在一年半的时间里,成像 X 射线偏振探测仪证明了偏振探测在 X 射线天文学中的作用和潜力。下一步工作包括向更高能量扩展。光电方法有可能扩展到 20-25 千伏,但超过这一能量的唯一技术是康普顿散射。掠入射光学技术可以将光子聚焦到 80 千伏,不排除将其边缘扩展到 150-200 千伏。考虑到所涉及的物理限制,从光电方法到散射方法的转变可能会因为高背景而降低光学技术的使用效果。我将讨论探测器设计方面的选择,以缓解这一问题,并为未来的技术发展提供指导。
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引用次数: 0
A High-Flux Compact X-ray Free-Electron Laser for Next-Generation Chip Metrology Needs 满足下一代芯片计量需求的高通量紧凑型 X 射线自由电子激光器
Q3 Physics and Astronomy Pub Date : 2024-03-01 DOI: 10.3390/instruments8010019
James Rosenzweig, G. Andonian, R. Agustsson, P. Anisimov, Aurora Araujo, Fabio Bosco, Martina Carillo, E. Chiadroni, L. Giannessi, Zhirong Huang, Atsushi Fukasawa, Dongsung Kim, S. Kutsaev, G. Lawler, Zenghai Li, N. Majernik, Pratik Manwani, J. Maxson, Janwei Miao, M. Migliorati, A. Mostacci, Pietro Musumeci, A. Murokh, E. Nanni, Sean O’Tool, L. Palumbo, R. Robles, Yusuke Sakai, E. Simakov, Madison Singleton, B. Spataro, Jingyi Tang, Sami Tantawi, Oliver Williams, Haoran Xu, M. Yadav
Recently, considerable work has been directed at the development of an ultracompact X-ray free-electron laser (UCXFEL) based on emerging techniques in high-field cryogenic acceleration, with attendant dramatic improvements in electron beam brightness and state-of-the-art concepts in beam dynamics, magnetic undulators, and X-ray optics. A full conceptual design of a 1 nm (1.24 keV) UCXFEL with a length and cost over an order of magnitude below current X-ray free-electron lasers (XFELs) has resulted from this effort. This instrument has been developed with an emphasis on permitting exploratory scientific research in a wide variety of fields in a university setting. Concurrently, compact FELs are being vigorously developed for use as instruments to enable next-generation chip manufacturing through use as a high-flux, few nm lithography source. This new role suggests consideration of XFELs to urgently address emerging demands in the semiconductor device sector, as identified by recent national need studies, for new radiation sources aimed at chip manufacturing. Indeed, it has been shown that one may use coherent X-rays to perform 10–20 nm class resolution surveys of macroscopic, cm scale structures such as chips, using ptychographic laminography techniques. As the XFEL is a very promising candidate for realizing such methods, we present here an analysis of the issues and likely solutions associated with extending the UCXFEL to harder X-rays (above 7 keV), much higher fluxes, and increased levels of coherence, as well as methods of applying such a source for ptychographic laminography to microelectronic device measurements. We discuss the development path to move the concept to rapid realization of a transformative XFEL-based application, outlining both FEL and metrology system challenges.
最近,在高场低温加速新兴技术的基础上,超小型 X 射线自由电子激光器(UCXFEL)的研发工作取得了长足进展,电子束亮度随之大幅提高,光束动力学、磁起落器和 X 射线光学方面的概念也达到了最先进的水平。在这项工作的基础上,我们完成了 1 nm(1.24 keV)UCXFEL 的完整概念设计,其长度和成本比目前的 X 射线自由电子激光器(XFEL)低一个数量级。该仪器的开发重点是允许在大学环境中进行各种领域的探索性科学研究。与此同时,紧凑型 FEL 也在大力发展,以用作高通量、几纳米光刻源,从而实现下一代芯片制造。这一新角色建议考虑使用 XFEL 来紧急满足半导体设备领域新出现的需求,正如最近的国家需求研究报告所确定的,新辐射源的目标是芯片制造。事实上,已经有研究表明,可以利用相干 X 射线,通过层析成像技术,对芯片等厘米级的宏观结构进行 10-20 纳米分辨率的测量。由于 XFEL 是实现此类方法的一个非常有前途的候选方案,我们在此分析了与将 UCXFEL 扩展到更硬的 X 射线(7 千伏以上)、更高的通量和更高的相干水平相关的问题和可能的解决方案,以及将此类层析成像源应用于微电子设备测量的方法。我们讨论了从概念到快速实现基于 XFEL 的变革性应用的发展路径,概述了 FEL 和计量系统所面临的挑战。
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引用次数: 0
Improving Fabrication and Performance of Additively Manufactured RF Cavities by Employing Co-Printed Support Structures and Their Subsequent Removal 通过采用共打印支撑结构及随后去除支撑结构,改进增材制造射频腔体的制造和性能
Q3 Physics and Astronomy Pub Date : 2024-03-01 DOI: 10.3390/instruments8010018
Michael Mayerhofer, Stefan Brenner, Michael Doppler, Luis Catarino, S. Girst, Vesna Nedeljkovic-Groha, Günther Dollinger
The enormous potential of additive manufacturing (AM), particularly laser powder bed fusion (L-PBF), to produce radiofrequency cavities (cavities) has already been demonstrated. However, the required geometrical accuracy for GHz TM010 cavities is currently only achieved by (a) avoiding downskin angles <40∘, which in turn leads to a cavity geometry with reduced performance, or (b) co-printed support structures, which are difficult to remove for small GHz cavities. We have developed an L-PBF-based manufacturing routine to overcome this limitation. To enable arbitrary geometries, co-printed support structures are used that are designed in such a way that they can be removed after printing by electrochemical post-processing, which simultaneously reduces the surface roughness and thus maximizes the quality factor Q0. The manufacturing approach is evaluated on two TM010 single cavities printed entirely from high-purity copper. Both cavities achieve the desired resonance frequency and a Q0 of approximately 8300.
增材制造(AM),特别是激光粉末床熔融(L-PBF)在生产射频腔体(空腔)方面的巨大潜力已得到证实。然而,要达到 GHz TM010 空腔所需的几何精度,目前只能通过以下方法:(a) 避免下表面角度小于 40∘,这反过来又会导致空腔几何形状的性能降低;或 (b) 共印支撑结构,这对于小型 GHz 空腔来说很难去除。我们开发了一种基于 L-PBF 的制造程序来克服这一限制。为了实现任意几何形状,我们使用了共印支撑结构,这种结构的设计方式使其可以在印刷后通过电化学后处理去除,这同时降低了表面粗糙度,从而最大限度地提高了质量因子 Q0。我们在两个完全用高纯度铜印刷的 TM010 单腔上对这种制造方法进行了评估。两个空腔都达到了理想的共振频率和大约 8300 的 Q0。
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引用次数: 0
Mini-EUSO on Board the International Space Station: Mission Status and Results 国际空间站上的迷你 EUSO:任务状态和结果
Q3 Physics and Astronomy Pub Date : 2024-01-24 DOI: 10.3390/instruments8010006
L. Marcelli
The telescope Mini-EUSO has been observing, since 2019, the Earth in the ultraviolet band (290–430 nm) through a nadir-facing UV-transparent window in the Russian Zvezda module of the International Space Station. The instrument has a square field of view of 44∘, a spatial resolution on the Earth surface of 6.3 km and a temporal sampling rate of 2.5 microseconds. The optics is composed of two 25 cm diameter Fresnel lenses and a focal surface consisting of 36 multi-anode photomultiplier tubes, 64 pixels each, for a total of 2304 channels. In addition to the main camera, Mini-EUSO also contains two cameras in the near infrared and visible ranges, a series of silicon photomultiplier sensors and UV sensors to manage night-day transitions. Its triggering and on-board processing allow the telescope to detect UV emissions of cosmic, atmospheric and terrestrial origin on different time scales, from a few microseconds up to tens of milliseconds. This makes it possible to investigate a wide variety of events: the study of atmospheric phenomena (lightning, transient luminous events (TLEs) such as ELVES and sprites), meteors and meteoroids; the search for nuclearites and strange quark matter; and the observation of artificial satellites and space debris. Mini-EUSO is also potentially capable of observing extensive air showers generated by ultra-high-energy cosmic rays with an energy above 1021 eV and can detect artificial flashing events and showers generated with lasers from the ground. The instrument was integrated and qualified in 2019 in Rome, with additional tests in Moscow and final, pre-launch tests in Baikonur. Operations involve periodic installation in the Zvezda module of the station with observations during the crew night time, with periodic downlink of data samples, and the full dataset being sent to the ground via pouches containing the data disks. In this work, the mission status and the main scientific results obtained so far are presented, in light of future observations with similar instruments.
自 2019 年以来,Mini-EUSO 望远镜一直在通过国际空间站俄罗斯 Zvezda 舱内一个面向天底的紫外线透明窗口,对地球进行紫外线波段(290-430 纳米)的观测。该仪器的方形视场为 44∘,地球表面的空间分辨率为 6.3 千米,时间采样率为 2.5 微秒。光学系统由两个直径为 25 厘米的菲涅尔透镜和一个由 36 个多阳极光电倍增管组成的焦面组成,每个光电倍增管有 64 个像素,总共有 2304 个通道。除主相机外,微型 EUSO 还包括两台近红外和可见光相机、一系列硅光电倍增管传感器和紫外线传感器,以管理夜-日转换。它的触发和机载处理功能使望远镜能够在不同的时间尺度(从几微秒到几十毫秒)上探测宇宙、大气和地面的紫外线辐射。这使得它有可能调查各种各样的事件:研究大气现象(闪电、瞬态发光事件(TLEs),如 ELVES 和精灵)、流星和流星体;寻找核子和奇异夸克物质;以及观测人造卫星和空间碎片。Mini-EUSO 还有可能观测到由能量超过 1021 eV 的超高能宇宙射线产生的大范围空气阵雨,并能探测到人造闪光事件和由地面激光产生的阵雨。该仪器于 2019 年在罗马进行了集成和鉴定,并在莫斯科进行了补充测试,最后在拜科努尔进行了发射前测试。操作包括定期安装在空间站的兹韦兹达(Zvezda)舱内,在机组人员夜间进行观测,定期下传数据样本,并通过装有数据盘的小袋将完整的数据集发送到地面。在这项工作中,根据今后使用类似仪器进行观测的情况,介绍了迄今为止的飞行任务状况和取得的主要科学成果。
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引用次数: 0
Double Photodiode Readout System for the Calorimeter of the HERD Experiment: Challenges and New Horizons in Technology for the Direct Detection of High-Energy Cosmic Rays 用于 HERD 实验量热计的双光电二极管读出系统:高能宇宙线直接探测技术的挑战与新视野
Q3 Physics and Astronomy Pub Date : 2024-01-22 DOI: 10.3390/instruments8010005
P. Betti, Oscar Adriani, Matias Antonelli, Yonglin Bai, Xiao Bai, T. Bao, E. Berti, L. Bonechi, M. Bongi, V. Bonvicini, S. Bottai, Weiwei Cao, J. Casaus, Zhen Chen, X.Z. Cui, R. D’Alessandro, S. Detti, Carlos Diaz, Yongwei Dong, N. Finetti, V. Formato, M. Frutos, Jiarui Gao, F. Giovacchini, Xiaozhen Liang, Ran Li, Xin Liu, L. Lyu, Gustavo Martinez, N. Mori, Jesus Marin Munoz, L. Pacini, P. Papini, C. Pizzolotto, Z. Quan, Jun-jun Qin, Da-lian Shi, O. Starodubtsev, Zhicheng Tang, A. Tiberio, V. Vagelli, E. Vannuccini, Bo Wang, Jun-jing Wang, Le Wang, Rui-jie Wang, G. Zampa, N. Zampa, Zhigang Wang, Ming Xu, Li Zhang, Jinkun Zheng
The HERD experiment is a future experiment for the direct detection of high-energy cosmic rays and is to be installed on the Chinese space station in 2027. The main objectives of HERD are the first direct measurement of the knee of the cosmic ray spectrum, the extension of electron+positron flux measurement up to tens of TeV, gamma ray astronomy, and the search for indirect signals of dark matter. The main component of the HERD detector is an innovative calorimeter composed of about 7500 LYSO scintillating crystals assembled in a spherical shape. Two independent readout systems of the LYSO scintillation light will be installed on each crystal: the wavelength-shifting fibers system developed by IHEP and the double photodiode readout system developed by INFN and CIEMAT. In order to measure protons in the cosmic ray knee region, we must be able to measure energy release of about 250 TeV in a single crystal. In addition, in order to calibrate the system, we need to measure typical releases of minimum ionizing particles that are about 30 MeV. Thus, the readout systems should have a dynamic range of about 107. In this article, we analyze the development and the performance of the double photodiode readout system. In particular, we show the performance of a prototype readout by the double photodiode system for electromagnetic showers as measured during a beam test carried out at the CERN SPS in October 2021 with high-energy electron beams.
HERD 实验是未来直接探测高能宇宙射线的实验,将于 2027 年安装在中国空间站上。HERD的主要目标是首次直接测量宇宙射线谱的膝部、将电子+正电子通量测量扩展到数十TeV、伽马射线天文学以及寻找暗物质的间接信号。HERD 探测器的主要部件是一个创新的热量计,由大约 7500 颗 LYSO 闪烁晶体组成,并组装成球形。每个晶体上都将安装两个独立的 LYSO 闪烁光读出系统:IHEP 开发的波长转换光纤系统和 INFN 和 CIEMAT 开发的双光电二极管读出系统。为了测量宇宙射线膝区的质子,我们必须能够在单个晶体中测量大约 250 TeV 的能量释放。此外,为了校准系统,我们还需要测量典型的最小电离粒子释放量,大约为 30 MeV。因此,读出系统应具有约 107 的动态范围。本文分析了双光电二极管读出系统的开发和性能。特别是,我们展示了 2021 年 10 月在欧洲核子研究中心 SPS 进行的高能电子束测试中测量到的双光电二极管系统读出原型的电磁辐照性能。
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引用次数: 0
An Ultra-Compact X-ray Regenerative Amplifier Free-Electron Laser 超小型 X 射线再生放大器自由电子激光器
Q3 Physics and Astronomy Pub Date : 2024-01-05 DOI: 10.3390/instruments8010002
Madison Singleton, J. Rosenzweig, Jingyi Tang, Zhirong Huang
There is a growing interest in designing and building compact X-ray Free Electron Lasers (FELs) for scientific and industry applications. In this paper, we report an X-ray Regenerative Amplifier FEL (XRAFEL) design based on a proposed Ultra Compact X-ray FEL configuration. Our results show that an XRAFEL can dramatically enhance the temporal coherence and increase the spectral brightness of the radiation in the hard X-ray regime without increasing the footprint of the FEL configuration. The proposed compact, fully coherent, and high-flux hard X-ray source holds promise as a valuable candidate for a wide range of high-impact applications in both academia and industry.
人们对设计和制造用于科学和工业应用的紧凑型 X 射线自由电子激光器(FEL)越来越感兴趣。本文报告了基于超紧凑 X 射线自由电子激光器配置的 X 射线再生放大器自由电子激光器(XRAFEL)设计。我们的研究结果表明,XRAFEL 可以在不增加 FEL 配置占地面积的情况下,显著增强硬 X 射线系统的时间相干性并提高辐射的光谱亮度。所提议的紧凑型、全相干和高通量硬 X 射线源有望成为学术界和工业界广泛的高影响力应用的宝贵候选者。
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引用次数: 0
Use of Silicon Photomultipliers in the Detectors of the JEM-EUSO Program 在 JEM-EUSO 计划的探测器中使用硅光电倍增管
Q3 Physics and Astronomy Pub Date : 2023-12-14 DOI: 10.3390/instruments7040055
F. Bisconti
The JEM-EUSO program aims to study ultra-high energy cosmic rays from space. To achieve this goal, it has realized a series of experiments installed on the ground (EUSO-TA), various on stratospheric balloons (with the most recent one EUSO-SPB2), and inside the International Space Station (Mini-EUSO), in light of future missions such as K-EUSO and POEMMA. At nighttime, these instruments aim to monitor the Earth’s atmosphere measuring fluorescence and Cherenkov light produced by extensive air showers generated both by very high-energy cosmic rays from outside the atmosphere and by neutrino decays. As the two light components differ in duration (order of microseconds for fluorescence light and a few nanoseconds for Cherenkov light) they each require specialized sensors and acquisition electronics. So far, the sensors used for the fluorescence camera are the Multi-Anode Photomultiplier Tubes (MAPMTs), while for the Cherenkov one, new systems based on Silicon PhotoMultipliers (SiPMs) have been developed. In this contribution, a brief review of the experiments is followed by a discussion of the tests performed on the optical sensors. Particular attention is paid to the development, test, and calibration conducted on SiPMs, also in view to optimize the geometry, mass, and weight in light of the installation of mass-critical applications such as balloon- and space-borne instrumentation.
JEM-EUSO 计划旨在研究来自太空的超高能量宇宙射线。为实现这一目标,该计划在地面(EUSO-TA)、平流层气球(最近的一个是 EUSO-SPB2)和国际空间站(Mini-EUSO)上安装了一系列实验设备,以应对未来的 K-EUSO 和 POEMMA 等任务。在夜间,这些仪器的目的是监测地球大气层,测量由大气层外的高能宇宙射线和中微子衰变产生的大量气流所产生的荧光和切伦科夫光。由于这两种光的持续时间不同(荧光为微秒级,切伦科夫光为几纳秒级),它们都需要专门的传感器和采集电子设备。迄今为止,荧光相机使用的传感器是多节点光电倍增管(MAPMT),而对于切伦科夫光,则开发了基于硅光电倍增管(SiPM)的新系统。在本文中,首先简要回顾了实验情况,然后讨论了对光学传感器进行的测试。其中特别关注了在硅光电倍增管上进行的开发、测试和校准,同时还考虑到安装气球和空间仪器等对质量要求极高的应用,对其几何形状、质量和重量进行了优化。
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引用次数: 0
Additive Manufacturing of Side-Coupled Cavity Linac Structures from Pure Copper: A First Concept 用纯铜快速制造侧耦合腔体直列加速器结构:第一个概念
Q3 Physics and Astronomy Pub Date : 2023-12-14 DOI: 10.3390/instruments7040056
Michael Mayerhofer, Stefan Brenner, Ricardo Helm, S. Gruber, Elena Lopez, Lukas Stepien, Gerald Gold, Günther Dollinger
Compared to conventional manufacturing, additive manufacturing (AM) of radio frequency (RF) cavities has the potential to reduce manufacturing costs and complexity and to enable higher performance. This work evaluates whether normal conducting side-coupled linac structures (SCCL), used worldwide for a wide range of applications, can benefit from AM. A unit cell geometry (SC) optimized for 75 MeV protons was developed. Downskins with small downskin angles α were avoided to enable manufacturing by laser powder bed fusion without support structures. SCs with different α were printed and post-processed by Hirtisation (R) (an electrochemical process) to minimize surface roughness. The required accuracy for 3 GHz SCCL (medical linacs) is achieved only for α>45∘. After a material removal of 140 µm due to Hirtisation (R), a quality factor Q0 of 6650 was achieved. This corresponds to 75% of the Q0 simulated by CST®. A 3 GHz SCCL concept consisting of 31 SCs was designed. The effective shunt impedance ZT2 simulated by CST corresponds to 60.13MΩm and is comparable to the ZT2 of SCCL in use. The reduction in ZT2 expected after Hirtisation (R) can be justified in practice by up to 70% lower manufacturing costs. However, future studies will be conducted to further increase Q0.
与传统制造相比,射频(RF)腔体的增材制造(AM)具有降低制造成本和复杂性并实现更高性能的潜力。这项研究评估了在全球范围内广泛应用的正常导电侧耦合线性腔体结构(SCCL)是否能从 AM 中受益。针对 75 MeV 质子开发了优化的单元格几何(SC)。避免了具有小下表面角 α 的下表面,以便在没有支撑结构的情况下通过激光粉末床熔融制造。打印出不同 α 的 SC,并通过 Hirtisation (R)(一种电化学工艺)进行后处理,以尽量减少表面粗糙度。只有当 α>45∘ 时,才能达到 3 GHz SCCL(医用直列加速器)的精度要求。由于 Hirtisation (R),材料去除 140 µm 后,质量因子 Q0 达到 6650。这相当于 CST® 模拟的 Q0 的 75%。设计了一个由 31 个 SC 组成的 3 GHz SCCL 概念。CST 模拟的有效分流阻抗 ZT2 为 60.13MΩm,与使用中的 SCCL 的 ZT2 相当。在实践中,Hirtisation (R) 后预计 ZT2 的减少可以通过降低高达 70% 的制造成本来证明。不过,未来的研究将进一步提高 Q0。
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引用次数: 0
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