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Sökning: WFRF:(Forestier E) > (2020-2023)

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  • Filippi, F., et al. (författare)
  • Plasma density profile reconstruction of a gas cell for Ionization Induced Laser Wakefield Acceleration
  • 2023
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 18:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Laser-driven plasma wakefields can provide hundreds of MeV electron beam in mm-range distances potentially shrinking the dimension of the actual particle accelerators. The plasma density plays a fundamental role in the control and stability of the acceleration process, which is a key development for the future electron injector proposed by EuPRAXIA. A gas cell was designed by LPGP and LIDYL teams, with variable length and backing pressure, to confine the gas and tailor the gas density profile before the arrival of the laser. This cell was used during an experimental campaign with the multi TW-class laser at the Lund Laser Centre. Ionization assisted injection in a tailored density profile is used to tune the electron beam properties. During the experiment, we filled the gas cell with hydrogen mixed with different concentration of nitrogen. We also varied the backing pressure of the gas and the geometrical length of the gas cell. We used a transverse probe to acquire shadowgraphic images of the plasma and to measure the plasma electron density. Methods and results of the analysis with comparisons between shadowgraphic and interferometric images will be discussed.
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  • Hickmann, Thomas, et al. (författare)
  • Success factors of global goal-setting for sustainable development : Learning from the Millennium Development Goals
  • 2023
  • Ingår i: Sustainable Development. - : Wiley. - 0968-0802 .- 1099-1719. ; 31:3, s. 1214-1225
  • Tidskriftsartikel (refereegranskat)abstract
    • The Millennium Development Goals (MDGs) were an important precursor to the Sustainable Development Goals (SDGs). Hence, identifying the conditions that made the MDGs successful enhances our understanding of global goal-setting and informs the global endeavour to achieve the SDGs. Drawing on a comprehensive review of 316 articles published between 2009 and 2018, we identify six factors that have enabled or hindered MDG implementation. Our analysis stresses the importance of path dependencies and shows that the MDGs catalysed changes only for those countries with sufficient resource availability, administrative capacity and economic development, as well as adequate support from external donors. National ownership and NGO pressure bolstered efforts to implement the MDGs. These findings suggest that globally agreed goals do not easily trickle down from the global to the national level. Thus, this article adopts a forward-looking perspective and draws key lessons for the current implementation of the SDGs in developing countries.
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