Spatial distribution of gas flux in molecular flow regime of linear differential pumping systems

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-12 DOI:10.1016/j.vacuum.2025.114740

Ziyang He , Haitao Fan , Hailin Bi , Minggao Xu , Xudi Wang , Jiuzhong Yang

{"title":"Spatial distribution of gas flux in molecular flow regime of linear differential pumping systems","authors":"Ziyang He , Haitao Fan , Hailin Bi , Minggao Xu , Xudi Wang , Jiuzhong Yang","doi":"10.1016/j.vacuum.2025.114740","DOIUrl":null,"url":null,"abstract":"<div><div>Linear differential systems are utilised in accelerators to meet the internal instrumental operating pressures, as well as to allow the passage of operating media such as light and accelerated particles. The system's compact structure and multi-stage series connection present a challenge in calculating the inner pressure of the chambers on the molecular flow. The article uses analytical derivation and numerical integration with MATLAB to investigate the spatial attenuation of gas particle flux out of cylindrical tubes and the gas throughput in the differential pumping systems. The results demonstrate the validity of the model with the experimental data of Adamson and gas spatial distribution patterns of direct-transit flow and wall-reflected flow out of cylindrical tubes. Furthermore, the gas filter, which serves as an example of a linear differential system, is utilised to demonstrate the contribution of each tube to the throughput to the differential chamber. Moreover, the gas particles that are directly traversed by the foremost differential tube constitute the primary gas source of the terminal differential chamber.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"242 ","pages":"Article 114740"},"PeriodicalIF":3.9000,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X25007304","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Linear differential systems are utilised in accelerators to meet the internal instrumental operating pressures, as well as to allow the passage of operating media such as light and accelerated particles. The system's compact structure and multi-stage series connection present a challenge in calculating the inner pressure of the chambers on the molecular flow. The article uses analytical derivation and numerical integration with MATLAB to investigate the spatial attenuation of gas particle flux out of cylindrical tubes and the gas throughput in the differential pumping systems. The results demonstrate the validity of the model with the experimental data of Adamson and gas spatial distribution patterns of direct-transit flow and wall-reflected flow out of cylindrical tubes. Furthermore, the gas filter, which serves as an example of a linear differential system, is utilised to demonstrate the contribution of each tube to the throughput to the differential chamber. Moreover, the gas particles that are directly traversed by the foremost differential tube constitute the primary gas source of the terminal differential chamber.

查看原文本刊更多论文

线性差动泵系统分子流态中气体通量的空间分布

线性微分系统在加速器中用于满足内部仪器操作压力，以及允许操作介质（如光和加速粒子）通过。该系统结构紧凑，多级串联，给计算各腔室内压力对分子流的影响带来了挑战。本文采用解析推导和MATLAB数值积分的方法，研究了差动泵系统中圆柱管外气体粒子通量的空间衰减和气体通量。用Adamson实验数据和圆柱管直接穿越流和壁面反射流的气体空间分布规律验证了该模型的有效性。此外，气体过滤器作为线性微分系统的一个例子，用于演示每根管对差分室吞吐量的贡献。此外，由最前面的差动管直接穿过的气体颗粒构成了末端差动室的主要气源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.