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2nd FPGA Developers' Forum (FDF) meeting
No full textThe design and verification of FPGA-based systems for space applications rely on complex toolchains that translate high-level logic into hardware implementations. Typically, only a single synthesis, placement, and routing tool is available for a given FPGA, making it difficult to assess how design choices and toolchain behavior interact. The availability of multiple toolchains allows cross-checking of design functionality, and an open-source tool can provide more avenues to inspect and control the implementation process.
To enable this, we have developed an alternative toolchain for the NanoXplore NG-Ultra, the only large, radiation-hardened FPGA made in Europe. As an activity under ESA's OSIP Ideas platform and with help from NanoXplore, we have extended nextpnr to support placement and routing for NG-Ultra. While not a goal of the project, we have also contributed an alternative synthesis flow based on Yosys, which allowed us to target individual aspects of the nextpnr flow when synthesizing test cases during development. The result is a prototype of an almost fully open-source flow, with only the bitstream generation and board programming steps still requiring vendor tools.
This presentation will discuss the technical challenges encountered in developing an alternate open source toolchain while trying not to replicate the vendor's approach. The FPGA’s large size required scaling improvements to the generic architecture-independent parts of nextpnr, while its nontraditional architecture—particularly its routing network—demanded close attention to placement strategies to ensure successful routing. This is a result of both complex routing constraints requiring careful implementation, and an overall limited amount of routing resources relative to logic elements in the NG-Ultra architecture.
Additionally, we will present our validation approach to confirm the correctness of our implementation, and benchmarking results comparing nextpnr against the vendor tool Impulse in terms of routability, resource utilization, and timing. We will explore examples where having an alternative toolchain may give us more confidence in our own design, but also cases where it gives us more flexibility to utilize resources in a different way in order to get specific behavior or test certain capabilities of the tools or the FPGA itself
CS3 2025 - Cloud Storage Synchronization and Sharing
No full textSunet Drive is Sweden’s national data storage solution, and part of the ScienceMesh and active member of the Open Cloud Mesh Community Group. It is a federated solution consisting of 54 nodes, one for every Swedish institution, including one node for external users. We will give an up-to-date overview of of Sunet Drive, including
• User and storage development
• New customer on-boarding and customizations
• Updates and incidents
• Extension to a third data center
• Implemented and planned features
Special focus of the community report will lie on the plan to develop Sunet Drive into a sovereign academic toolbox, capable of FAIR data handling and data analysis. This includes our efforts in developing and rolling out Secure Zones and Step-up-Authentication, including the transition from a Nextcloud Global Scale to a ”purely federated” deployment, as well as the integration of RDS-NG and the development of a new connector for the Swedish National Dataservice system DORIS. In addition, we will briefly talk about the status of ”Scalable JupyterHub”, funded through GN5-1 - GÉANT Project Incubator
Supersymmetry searches at ATLAS and CMS
No full textThis document presents recent results from the ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC) on supersymmetry (SUSY) searches. These searches provide results with some non-conventional SUSY search assumptions such as with compressed mass scenario or with long-lived particle scenario. Some of the recent results covers the unexplored SUSY phase space from prior results, brings a new insight to the SUSY landscape. Sensitivity on SUSY upper limits are enhanced with newly added LHC data, enhanced trigger algorithm or advanced event selection with machine learning (ML).This document presents recent results from the ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC) on supersymmetry (SUSY) searches. These searches provide results with some non-conventional SUSY search assumptions such as with compressed mass scenario or with long-lived particle scenario. Some of the recent results covers the unexplored SUSY phase space from prior results, brings a new insight to the SUSY landscape. Sensitivity on SUSY upper limits are enhanced with newly added LHC data, enhanced trigger algorithm or advanced event selection with machine learning (ML)
Photonuclear Jet Production in Ultra-Peripheral Pb+Pb Collisions at 5.02 TeV with the ATLAS Detector
No full textIn ultra-relativistic heavy ion collisions, the charged ions produce an intense flux of equivalent photons. Photon-induced processes are the dominant interaction mechanism when the colliding nuclei have an impact parameter larger than the nuclear diameter. In these ultra-peripheral collisions (UPCs), the photon provides a clean, energetic probe of the partonic structure of the nucleus, analogous to deep inelastic scattering. This talk presents a measurement of jet production in UPCs performed with the ATLAS detector using high-statistics 2018 Pb+Pb data. Events are selected using requirements on jet production, rapidity gaps, and forward neutron emission to identify inclusive photo-nuclear hard-scattering processes. These measurements also include detailed studies of rapidity gap distributions and nuclear break-up effects, allowing for precise comparisons between data and theory for inclusive photo-nuclear processes. The measured cross-sections are compared to theoretical models in phase-space regions where significant nuclear PDF modifications are expected but not well constrained by world data, demonstrating the potential of these data to provide a strong new constraint on nPDF effects
QCD, Electroweak Physics, and Searches for Exotic Signatures in the Forward Region at LHCb
No full textThe LHCb experiment is a forward spectrometer that offers a unique phase-space coverage at the Large Hadron Collider (LHC). Such a unique coverage offers the possibility to produce complementary and unique physics results in electroweak (EW), quantum chromodynamics (QCD), and searches for exotic signatures from beyond the Standard Model (BSM) physics. These proceedings provide an exhibition of select results from the LHCb experiment in the fields of EW, QCD, and exotics
Three-pion Bose-Einstein correlations measured in proton-proton collisions
No full textA study on the Bose-Einstein correlations for triplets of same-sign pions is presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of = 7 TeV, recorded by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb. For the first time, the results are interpreted in the core-halo model. The parameters of the model are determined in regions of charged-particle multiplicity. This measurement provides insight into the nature of hadronisation in terms of coherence, being consistent with the presence of coherent emission of pions.[graphic not available: see fulltext]A study on the Bose-Einstein correlations for triplets of same-sign pions is presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of = 7 TeV, recorded by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb. For the first time, the results are interpreted in the core-halo model. The parameters of the model are determined in regions of charged-particle multiplicity. This measurement provides insight into the nature of hadronisation in terms of coherence, showing a coherent emission of pions