Linear plasma devices represent an essential tool for nuclear fusion research, whereby understanding crucial aspects related to plasma-wall interactions or edge plasma behaviour. Simplified models are of great importance to complement and integrate experimental and simulation results of complex systems such as plasmas in linear machines, because they are fast and simple to employ. In this work, we present a global volume-averaged (0D) model for plasma investigation in linear machines. The 0D model equations are based on the space integration of the state of the art edge plasma model implemented in the SOLPS-ITER code. Comparisons between helium plasmas described with 2D simulations performed with SOLPS-ITER and with the 0D model highlight that contributions often neglected in tokamak edge models, e.g. electron-neutral excitation, may be relevant when describing weakly ionized plasmas in linear devices. The model is used to perform sensitivity studies with respect to several parameters and to analyse the time evolution of the system, leading to the identification of two relevant time scales governing the system. Lastly, a comparison of 0D results with experimental data from the linear device GyM is performed, showing satisfactory agreement. Our methods and results provide crucial interpretative keys in the investigation of the physics of edge plasmas.

线性等离子体装置是核聚变研究的重要工具，可借此了解与等离子体壁相互作用或边缘等离子体行为相关的关键方面。简化模型对于补充和整合复杂系统（例如线性机器中的等离子体）的实验和仿真结果非常重要，因为它们使用起来既快速又简单。在这项工作中，我们提出了一个全局体积平均 (0D) 模型，用于线性机器中的等离子体研究。0D 模型方程基于在 SOLPS-ITER 代码中实现的最先进边缘等离子体模型的空间集成。用 SOLPS-ITER 执行的 2D 模拟和 0D 模型描述的氦等离子体之间的比较突出了托卡马克边缘模型中经常被忽略的贡献，例如电子中性激发，在描述线性器件中的弱电离等离子体时可能是相关的。该模型用于对多个参数进行敏感性研究并分析系统的时间演变，从而确定控制系统的两个相关时间尺度。最后，将 0D 结果与线性设备 GyM 的实验数据进行比较，显示出令人满意的一致性。我们的方法和结果为边缘等离子体物理研究提供了关键的解释性关键。将 0D 结果与来自线性设备 GyM 的实验数据进行比较，显示出令人满意的一致性。我们的方法和结果为边缘等离子体物理研究提供了关键的解释性关键。将 0D 结果与来自线性设备 GyM 的实验数据进行比较，显示出令人满意的一致性。我们的方法和结果为边缘等离子体物理研究提供了关键的解释性关键。