Electron excitation of Cesium and its application to plasma modeling*

Electron impact excitation cross-sections and rate coefficients have been calculated using fully relativistic distorted wave theory for several fine-structure transitions from the ground as well as excited states of cesium. As an application, the calculated detailed cross-sections are used to construct a reliable collisional radiative (CR) model [1] to characterize the hydrogen-cesium plasma. These processes play dominant role in low pressure hydrogen-cesium plasma, which is relevant to the negative ion based neutral beam injectors for the ITER project. The calculated cross-sections and the extracted plasma parameters from the present model are compared with the available experimental and theoretical results [2]. [1] R.~K.~Gangwar, Dipti, R.~Srivastava and L.~Stafford, \textit{Plasma Sources Sci. Technol. }\textbf{25}, 035025 (2016). [2] Priti, Dipti, R K Gangwar and R Srivastava, \textit{J. Quant. Spectrosc. Radiat. Transf, } \textbf{187, } 426 (2017).