Observation of dipole-mode vector solitons

We report on the first experimental observation of a novel type of optical vector soliton, a {\em dipole-mode soliton}, recently predicted theoretically. We show that these vector solitons can be generated in a photorefractive medium employing two different processes: a phase imprinting, and a symmetry-breaking instability of a vortex-mode vector soliton. The experimental results display remarkable agreement with the theory, and confirm the robust nature of these radially asymmetric two-component solitary waves.Comment: 4 pages, 8 figures; pictures in the PRL version are better qualit

To Act or Not to Act – Handling File Format Identification Issues in Practice: Poster - iPRES 2016 - Swiss National Library, Bern

Format identification output needs to be assessed within an institutional context, also considering provenance information that is not contained in the data, but provided by data producers by other means. Sometimes, real issues in the data need to be distinguished from warnings. Ideally, this assessment should permit to decide where to invest effort in correcting issues, where to just document them, and where to postpone activities. The poster presents preliminary considerations at the ETH Data Archive of ETH-Bibliothek, the main library of ETH Zurich, on how to address file format identification and validation issues. The underlying issues are mostly independent of the specific tools and systems employed

New Generation CERN LHC Injection Dump - Assembly and Installation (TDIS)

During CERN’s LS2, several upgrades were performed to beam intercepting devices in the framework of the HL-LHC Project. Upgraded equipment includes two internal beam dumps (TDIS) intended for machine protection located at the injection points from the SPS to the LHC. These two devices have been assembled, tested, and installed around LHC Point 2 and Point 8 and are currently ready to get commissioned with the beam. They are 5.8m-long, three-module-segmented vacuum chambers, with large aperture to accommodate the injected and circulating beam and equipped with absorbing materials, These comprise graphite and higher Z alloys that are embedded on sub-assemblies reinforced with back-stiffeners made of TZM. The current contribution covers three main matters. First, it details the TDIS design and its key technical features. The second topic discussed is the outcome of an experiment where a prototype module was tested under high-energy beam impacts at CERN’s HiRadMat facility. To conclude it is presented the return of experience from the pre-series construction, validation and installation in the LHC tunnel