电子回旋共振离子源中的金属蒸发动力学:等离子体在原子扩散、电离和传输中的作用

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
A Pidatella, D Mascali, A Galatà, B Mishra, E Naselli, L Celona, R Lang, F Maimone, G S Mauro, D Santonocito, G Torrisi
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引用次数: 0

摘要

我们对通过电子回旋共振(ECR)等离子阱中的电阻加热炉蒸发的金属动力学进行了数值研究,该等离子阱用作加速器和等离子物理多学科研究的金属离子束注入器。我们使用互补数值方法在 PANDORA 陷阱框架内进行计算。通过 COMSOL Multiphysics® 进行静态和随时间变化的粒子流计算,探讨了分子流制度下金属蒸气在等离子体室表面的扩散和沉积。然后研究了蒸汽在强能量 ECR 等离子体中的电离情况。我们开发了蒙特卡洛(MC)代码来模拟等离子体内金属离子的动力学,并结合阱内等离子体物理的粒子入胞模拟。强不均匀等离子体的存在会导致金属的电荷交换和电子撞击电离,进而影响金属在阱壁上的沉积速率/形态。结果表明蒸气动力学如何取决于蒸发金属和等离子体目标。我们研究了 134Cs、176Lu 和 48Ca 同位素,前两种是 PANDORA 项目感兴趣的放射性同位素,第三种是核物理界最需要的稀有同位素之一。我们介绍了这项研究的一个应用:通过计算测量时间内沉积的放射性中性原子核的γ活度,我们利用GEANT4定量估算了整个γ探测系统的效率,包括来自阱壁的中毒γ信号,这与PANDORA实验中短寿命原子核衰变率的γ标记有关。这项工作可以为蒸发技术和等离子源优化提供宝贵的支持,从而改进金属离子束的产生,避免已知会影响源长期稳定性的大量金属沉积/浪费,以及在稀有同位素情况下的辐射安全问题和减少材料浪费。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metal evaporation dynamics in electron cyclotron resonance ion sources: plasma role in the atom diffusion, ionisation, and transport
We present a numerical study of metals dynamics evaporated through resistively heated ovens in electron cyclotron resonance (ECR) plasma traps, used as metal ion beam injectors for accelerators and multi-disciplinary research in plasma physics. We use complementary numerical methods to perform calculations in the framework of the PANDORA trap. The diffusion and deposition of metal vapours at the plasma chamber’s surface are explored under molecular flow regime, with stationary and time-dependent particle fluid calculations via COMSOL Multiphysics®. The ionisation of vapours is then studied in the strongly energised ECR plasma. We have developed a Monte Carlo (MC) code to simulate the in-plasma metal ions’ dynamics, coupled to particle-in-cell simulations of the plasma physics in the trap. The presence of strongly inhomogeneous plasmas leads to charge-exchange and electron-impact ionisations of metals, in turn affecting the deposition rate/pattern of the metal on the walls of the trap. Results show how vapours dynamics depends both on evaporated metals and the plasma target. The 134Cs, 176Lu, and 48Ca isotopes were investigated, the first two being radioisotopes interesting for the PANDORA project, and the third as one of the most required rare isotope by the nuclear physics community. We present an application of the study: MC computing the γ activity due to the deposited radioactive neutral nuclei during the measurement time, we quantitatively estimated the overall γ-detection system’s efficiency using GEANT4, including the poisoning γ-signal from the walls of the trap, relevant for the γ-tagging of short-lived nuclei’s decay rate in the PANDORA experiment. This work can give valuable support both to the evaporation technique and plasma source optimisation, for improving the metal ion beam production, avoiding huge deposit/waste of metals known to affect the long-term source stability, as well as for radio-safety aspects and reducing material waste in case of rare isotopes.
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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