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-  {
-    "title": "Monte Carlo modeling of low-energy electron-induced secondary electron   emission yields in micro-architected boron nitride surfaces",
-    "authors": [
-      "Hsing-Yin Chang",
-      "Andrew Alvarado",
-      "Trey Weber",
-      "Jaime Marian"
-    ],
-    "abstract": "Surface erosion and secondary electron emission (SEE) have been identified as the most critical life-limiting factors in channel walls of Hall-effect thrusters for space propulsion. Recent wall concepts based on micro-architected surfaces have been proposed to mitigate surface erosion and SEE. The idea behind these designs is to take advantage of very-high surface-to-volume ratios to reduce SEE and ion erosion by internal trapping and redeposition. This has resulted in renewed interest to study electron-electron processes in relevant thruster wall materials. In this work, we present calculations of SEE yields in micro-porous hexagonal BN surfaces using stochastic simulations of electron-material interactions in discretized surface geometries. Our model consists of two complementary parts. First we study SEE as a function of primary electron energy and incidence angle in flat surfaces using Monte Carlo simulations of electron multi-scattering processes. The results are then used to represent the response function of discrete surface elements to individual electron rays generated using a ray-tracing Monte Carlo model. We find that micro-porous surfaces result in SEE yield reductions of over 50% in the energy range experienced in Hall thrusters. This points to the suitability of these micro-architected surface concepts to mitigate SEE-related issues in compact electric propulsion devices.",
-    "arxiv_id": "1902.08413v1",
-    "categories": [
-      "physics.comp-ph",
-      "cond-mat.mtrl-sci"
-    ],
-    "primary_category": "physics.comp-ph",
-    "published_date": "2019-02-22T09:32:09Z",
-    "updated_date": "2019-02-22T09:32:09Z",
-    "pdf_url": "https://arxiv.org/pdf/1902.08413v1",
-    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\1902.08413v1.pdf",
-    "comment": "",
-    "journal_ref": "",
-    "doi": ""
-  },
-  {
-    "title": "Monte Carlo Raytracing Method for Calculating Secondary Electron   Emission from Micro-Architected Surfaces",
-    "authors": [
-      "Andrew Alvarado",
-      "Hsing-Yin Chang",
-      "Warren Nadvornick",
-      "Nasr Ghoniem",
-      "Jaime Marian"
-    ],
-    "abstract": "Secondary electron emission (SEE) from inner linings of plasma chambers in electric thrusters for space propulsion can have a disruptive effect on device performance and efficiency. SEE is typically calculated using elastic and inelastic electron scattering theory by way of Monte Carlo simulations of independent electron trajectories. However, in practice the method can only be applied for ideally smooth surfaces and thin films, not representative of real material surfaces. Recently, micro-architected surfaces with nanometric features have been proposed to mitigate SEE and ion-induced erosion in plasma-exposed thruster linings. In this paper, we propose an approach for calculating secondary electron yields from surfaces with arbitrarily-complex geometries using an extension of the \\emph{ray tracing} Monte Carlo (RTMC) technique. We study nanofoam structures with varying porosities as representative micro-architected surfaces, and use RTMC to generate primary electron trajectories and track secondary electrons until their escape from the outer surface. Actual surfaces are represented as a discrete finite element meshes obtained from X-ray tomography images of tungsten nanofoams. At the local level, primary rays impinging into surface elements produce daughter rays of secondary electrons whose number, energies and angular characteristics are set by pre-calculated tables of SEE yields and energies from ideally-flat surfaces. We find that these micro-architected geometries can reduce SEE by up to 50\\% with respect to flat surfaces depending on porosity and primary electron energy.",
-    "arxiv_id": "1806.00205v1",
-    "categories": [
-      "cond-mat.mtrl-sci",
-      "physics.comp-ph"
-    ],
-    "primary_category": "cond-mat.mtrl-sci",
-    "published_date": "2018-06-01T05:57:31Z",
-    "updated_date": "2018-06-01T05:57:31Z",
-    "pdf_url": "https://arxiv.org/pdf/1806.00205v1",
-    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\1806.00205v1.pdf",
-    "comment": "",
-    "journal_ref": "",
-    "doi": ""
-  }
-]
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