E-Mail IMAGE: The traveling wave tube (TWT) used in the experiments at Aix-Marseille University in France. view more Credit: Meirielen Caetano de Sousa/USP A paper on research conducted by Meirielen Caetano de Sousa, postdoctoral fellow at the University of São Paulo's Physics Institute (IF-USP) in Brazil, is highlighted as Editor's Pick in the September issue of Physics of Plasmas, published by the American Institute of Physics with the cooperation of The American Physical Society. The paper, entitled "Wave-particle interactions in a long traveling wave tube with upgraded helix", is signed by Sousa, Iberê Caldas, her supervisor at IF-USP, and collaborators at Aix-Marseille University in France, where Sousa served a research internship with the support of a scholarship from FAPESP (São Paulo Research Foundation) and CAPES, the Brazilian Ministry of Education's higher research council.