P2DN: A Pulsed Setup for High-Density Supersonic Plasma Expansion

IF 2.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
N. Suas-David*, Y. Gu, H. Linnartz and J. Bouwman, 
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Abstract

We present the piezostack pulsed discharge nozzle (P2DN), which is a next-generation apparatus that enables the production of a pulsed supersonic plasma expansion over a wide range of densities. This system combines a slit discharge nozzle with a very high-throughput piezostack actuator (PSA), allowing for accurate control of the pressure upstream of the nozzle up to values of at least 2 bar. Such pressures are inaccessible with most of the currently available systems, in particular the widespread systems that employ solenoid valves. The strength of the piezostack stems from its very stable pulse-to-pulse mass flow even when operating at a very high backing pressure. Combined with a reservoir placed upstream of the discharge nozzle, the PSA distributes the gas uniformly along the slit axis producing a high-quality supersonic flow. The plasma expansion is thus produced in a controlled environment and is suitable for stable, long-run experiments. A homemade program (PSAjet) is presented that allows modeling the gas flow through the different parts of the P2DN and for predicting the reservoir pressure during a gas pulse. In addition, the resulting supersonic expansion is modeled by means of two complementary approaches: isentropic relations are employed to retrieve the thermodynamic parameters along the jet axis, while Direct Simulation Monte Carlo (DSMC) is used to reproduce the supersonic expansion complex structure. These programs are suitable for tuning the experimental parameters to reach the target conditions. The P2DN proved to produce higher densities of exotic carbon chain radicals that result in stronger absorption features, opening the way to the detection of new weak molecular signatures and allowing for new plasma studies and the investigation of the induced chemistry.

Abstract Image

P2DN:用于高密度超音速等离子体膨胀的脉冲装置
我们提出了压电堆脉冲放电喷嘴(P2DN),这是一种下一代装置,能够在大密度范围内产生脉冲超音速等离子体膨胀。该系统结合了一个狭缝放电喷嘴和一个非常高通量的压堆致动器(PSA),可以精确控制喷嘴上游的压力,最高可达2 bar。这种压力是目前大多数可用系统无法达到的,特别是使用电磁阀的广泛系统。即使在非常高的背压下工作,压电堆的强度也源于其非常稳定的脉冲对脉冲质量流。与放置在喷管上游的储液器相结合,PSA将气体均匀地分布在狭缝轴上,产生高质量的超声速流动。因此,等离子体膨胀是在受控的环境中产生的,适合于稳定的、长期的实验。提出了一个自制的程序(PSAjet),可以模拟气体通过P2DN不同部分的流动,并预测气体脉冲期间的储层压力。此外,通过两种互补的方法对所得到的超声速膨胀进行建模:利用等熵关系获取沿射流轴方向的热力学参数,利用直接模拟蒙特卡罗(DSMC)再现超声速膨胀复体结构。这些程序适用于调整实验参数以达到目标条件。P2DN被证明可以产生更高密度的外来碳链自由基,从而产生更强的吸收特征,为检测新的弱分子特征开辟了道路,并允许新的等离子体研究和诱导化学的研究。
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来源期刊
ACS Earth and Space Chemistry
ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology
CiteScore
5.30
自引率
11.80%
发文量
249
期刊介绍: The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.
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