265 research outputs found
Plasma wakefield accelerators
No full textEdda Gschwendtner and Patric Muggli discuss the concept of plasma wakefield acceleration and
its potential for future particle colliders and other applications
Advanced particle beam accelerators
No full textAs part of the event: " Exploring farther: machines for new knowledge" , presentation of Mei Bai, Edda Gschwendtner, Mike Seidel, about Advanced particle beam accelerator
Breves Observações sobre a Edda em Prosa
No full textResumo
Este artigo é uma pequena contribuição para o estudo da mitologia escandinava medieval, e tem como objetivo estimular o conhecimento da obra islandesa Edda em prosa, através de breves observações sobre as análises acadêmicas tradicionais que a abordam como obra de um único autor.
Palavras-chave: Literatura Medieval, Islândia, Edda em prosa
Abstract
This article is a small contribution to the study of mediaeval Scandinavian mythology. Its objective is to stimulate interest in the Icelandic Prose Edda, through brief observations about traditional academic analysis, which treats it as the work of a single author.
Keywords: Mediaeval Literature, Iceland, Prose Edd
Educación política para una democracia radical
No full textThis article takes as starting point the understanding that liberal democracy is in crisis. The article draws upon a systematic review of the literature to examine alternative democratic discourses, including radical democracy as conceived by Ernesto Laclau and Chantal Mouffe. Following their work, it is understood that political education should facilitate opportunities for students to open, expand and change our existing democratic arrangements. Political education framed in these terms could follow three types of pedagogies: pedagogies of difference, pedagogies of articulation and pedagogies of equivalence. The article concludes by drawing upon existing qualitative research by author Edda Sant to consider examples of what these pedagogies could look like in practice
Starting Up the AWAKE Experiment at CERN
No full textAWAKE, the Advanced Proton Driven Plasma Wake-field Acceleration Experiment at CERN was approved in 2013. The facility was commissioned in 2016 to perform first experiments to demonstrate the self-modulation in-stability (SMI) of a 400 GeV/c SPS proton bunch in a 10 m long Rubidium plasma cell. The plasma is created in Rb vapor via field ionization by a TW laser pulse. In the second phase starting late 2017, the proton driven plasma wakefield will be probed with an externally injected 10 ' 20 MeV/c electron beam. This paper gives an overview of the AWAKE facility, describes the successful commissioning of the laser and proton beam line, the plasma cell and diagnostics and shows the successful synchronization of the proton beam with the laser at the few ps level so that the facility is ready for the SMI physics runs. In addition the status of the electron acceleration exper-iment for late 2017 will be presented
III.15 — Plasma wakefield acceleration and the AWAKE experiment at CERN
No full textThe high gradient of plasma wakefield acceleration makes this technology very interesting for reducing the size (and cost) for future linear colliders. The idea is to use plasma to convert the transverse electric field of a drive bunch into a longitudinal electric field in the plasma. The more energy is available, the longer (distance-wise) these plasma wakefields can be driven.AWAKE is an international Collaboration, consisting of 22 institutes. In AWAKE many general issues are studied, which are relevant for concepts that are based on plasma wakefield acceleration
CAS course on Basics of Accelerator Physics and Technology, 11 - 15 March 2024, Ferney-Voltaire, France
No full textThe construction of ever larger and costlier accelerator facilities has its limits, and new technologies will be needed to push the energy frontier. Plasma wakefield acceleration is a rapidly developing field which appears to be an auspicious candidate technology for future high-energy accelerators providing acceleration gradients with a factor 10 to 1000 larger than in conventional radio-frequency metallic cavities used in current accelerators.
This presentation introduces the plasma wakefield acceleration physics and technology, shows the technological challenges, gives an overview of the state of the art and shows promising results on the example of the advanced proton-driven plasma wakefield experiment, AWAKE, at CERN
Reflections on the Creation of Snorri Sturluson’s Prose Edda
No full textSince Elias Wessén’s facsimile edition of the Codex Regius of the Younger Edda (1940) most scholars have agreed (if a little hesitantly) with his theory that the Prose Edda was composed back to front, and that Háttatal was the first part to be written. This theory has also played an important role in the dating of Edda. The present article begins by investigating the arguments that lay behind Wessén’s conclusions and finds them to be very weak. On the basis of the discussion conducted here of the potential connection and lack of connection that exists between Háttatal, Skáldskaparmál, Gylfaginning and the Prologue, the conclusion is that as several Icelandic scholars have earlier hinted, it is necessary for future scholars to carry out more research into the various parts of the Edda as individual works rather than as a whole. As is shown, there is good reason for postulating that the corpus of tales that lies behind Gylfaginning was probably essentially gathered during Snorri’s years in Oddi (1180–1198) and that this might also apply to the corpus of stanzas and lists of kennings that form the lion’s share of Skáldskaparmál, even if the final touches to these didactic works was written later, perhaps during Snorri’s years in Reykjaholt (after 1206 and before the visit to Norway in 1218). This might explain why earlier efforts to find a single archetype for the Edda as a whole have hitherto been more or less in vain: The likelihood is that for Edda as a whole there was not just one archetype but it is more a question of three works which were later assembled into one, along with a Prologue which may have previously accompanied a version of Gylfaginning. There is little question that the poet who wrote Háttatal in 1222–25 had already attained training in composing verse that provided him with a detailed knowledge of the poetic language, kennings and heiti. However, with regard to the potential connection between Háttatal and the rest of the Edda, it needs to be borne in mind that there was actually very little need to explain the poetic language used in the poem. On the contrary: anyone trained in listening to skaldic poetry could most likely have understood almost all of the roughly 230 kennings in the poem, very few of which actually build upon tales told in Skáldskaparmál and Gylfaginning. It seems likely that Snorri’s main innovation for the cultural history of Iceland with the various parts of the Edda was his organisation of the extant heathen mythology and the materials that had been used to train poets over the centuries. In short, his skill here was more that of an editor more than of a creative author. Indeed, this is reflected in in the DG 11 4to manuscript in Uppsala, which states that he ‘setti saman’, or compiled existing knowledge about the heathen gods and the traditional poetry
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