Fixing E-field divergence in strongly non-linear wakefields in homogeneous plasma. (2nd October 2020)

• Record Type: Journal Article
• Authors: Reichwein, L; Thomas, J; Golovanov, A; Kostyukov, I; Pukhov, A
• Is Part Of: Plasma physics and controlled fusion. Volume 62:Number 11(2020)
• Publication Date: 2020-10-02
• Subjects: wakefield acceleration -- Trojan horse regime -- particle-in-cell simulations -- analytical theory; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/abb618
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Available analytical wakefield models for the bubble and the blow-out regime of electron-plasma acceleration perfectly describe important features like shape, fields, trapping ratio, achievable energy, energy distribution and radial emittance. As we show, for wakefields with an extremely small amplitude these models fail to describe the accelerating electric field and its divergence in the wakefield rear. Since prominent parameter regimes like the Trojan horse regime of photocathode injection exhibit this feature, it is of great importance to work out analytical models that fix this problem; one possible model is introduced in this work. Using a phenomenological theory, we are able to better describe the divergence of the electric field and the bubble shape.