Tootfinder

Yesterday I received 9 more photos from Fatali which I’m allowed to share on my blog "blog.watzmann.social". Thank you very much for that. The digital versions of these photos, while serving as examples of the superiority of the Cibachrome process, can only hint at their perfection. However, you can only truly appreciate the quality of these images if you’ve seen the Cibachrome prints with your own eyes.

Cibachrome: The Noblest Colour Printing Process in the History of Photography
A process that captured liquid light on paper — and nearly died with the digital age There are moments in the darkroom that burn themselves into memory. When a Cibachrome print slowly emerges in the processing drum — that glassy luminosity, those colours like liquid light, that depth of black no inkjet

ReveaLLAGN 1 - JWST Emission-Line Spectra Reveal Low-Luminosity #AGN with UV-Deficient SEDs and Warm Molecular Gas: https://arxiv.org/abs/2601.16977 -> James Webb Space Telescope uncovers secret supermassive black holes that escape traditional detection: https://www.space.com/astronomy/james-webb-space-telescope/james-webb-space-telescope-uncovers-secret-supermassive-black-holes-that-escape-traditional-detection

🇺🇦 #NowPlaying on BBCRadio3's #RoundMidnight
Andrew McCormack:
🎵 Luminosity
#AndrewMcCormack

New Challenges in Plasma Accelerators: Final Focusing for Wakefield Colliders
Keegan Downham (University of California, Santa Barbara, SLAC National Accelerator Laboratory), Spencer Gessner (SLAC National Accelerator Laboratory), Lewis Kennedy (CERN), Rogelio Tom\'as (CERN), Andrei Seryi (Old Dominion University)
https://arxiv.org/abs/2602.15777 https://arxiv.org/pdf/2602.15777 https://arxiv.org/html/2602.15777
arXiv:2602.15777v1 Announce Type: new
Abstract: The focusing of particle beams for collider experiments is crucial for maximizing the luminosity and thus the discovery potential of these machines. In recent years, plasma wakefield acceleration has emerged as a leading candidate for achieving higher energy collisions with smaller facility footprints due to the large accelerating gradients in the plasma. This higher beam energy poses significant challenges for the final focusing system of the collider. Here, we discuss the various challenges of final focusing for TeV-scale plasma accelerators and propose possible solutions. Finally, we present the first design of a final focusing system for a 10 TeV linear wakefield collider, evaluate its performance, and discuss its shortcomings as well as improvements for future designs.
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Application of RFSoC Technology for Beam Position Monitors at the SuperKEKB Storage Rings Injection Points
B. Urbschat, G. Mitsuka, L. Ruckman
https://arxiv.org/abs/2602.14870 https://arxiv.org/pdf/2602.14870 https://arxiv.org/html/2602.14870
arXiv:2602.14870v1 Announce Type: new
Abstract: In order to achieve its ambitious luminosity target, the SuperKEKB collider must achieve and sustain high beam currents on the order of Ampere in its storage rings. This requires continuous top-up injection and operation with a two-bunch injection scheme, injecting two 96 ns spaced bunches in a single injection cycle. An important input for tuning the injection beam is the position reading from a dedicated beam position monitor (BPM), located after the septum magnets, slightly upstream of where the injected and stored beams converge. Previously, the readout electronics used for these special BPMs were not capable of independent measurement of both bunches in the two-bunch injection mode and modification of the concerned devices and their firmware was not feasible. The opportunity was taken to develop a new readout device based on the AMD/Xilinx RF System on a Chip (RFSoC) platform with the goal of not only providing a sufficiently flexible and performant readout solution for the concerned BPMs, but also to evaluate and gain experience with the platform for beam monitor electronics applications. This paper is concerned with the details of this development as well as evaluation and operation of the developed device.
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Proton Energy Dependence of Radiation Induced Low Gain Avalanche Detector Degradation
Veronika Kraus, Marcos Fernandez Garcia, Luca Menzio, Michael Moll
https://arxiv.org/abs/2602.01800 https://arxiv.org/pdf/2602.01800 https://arxiv.org/html/2602.01800
arXiv:2602.01800v1 Announce Type: new
Abstract: Low Gain Avalanche Detectors (LGADs) are key components for precise timing measurements in high-energy physics experiments, including the High Luminosity upgrades of the current LHC detectors. Their performance is, however, limited by radiation induced degradation of the gain layer, primarily driven by acceptor removal. This study presents a systematic comparison of how the degradation evolves with different incident proton energies, using LGADs from Hamamatsu Photonics (HPK) and The Institute of Microelectronics of Barcelona (IMB-CNM) irradiated with 18 MeV, 24 MeV, 400 MeV and 23 GeV protons and fluences up to 2.5x10^15 p/cm2. Electrical characterization is used to extract the acceptor removal coefficients for different proton energies, whereas IR TCT measurements offer complementary insight into the gain evolution in LGADs after irradiation. Across all devices, lower energy protons induce stronger gain layer degradation, confirming expectations. However, 400 MeV protons consistently appear less damaging than both lower and higher energy protons, an unexpected deviation from a monotonic energy trend. Conversion of proton fluences to 1 MeV neutron-equivalent fluences reduces but does not eliminate these differences, indicating that the standard Non-Ionizing Energy Loss (NIEL) scaling does not fully account for the underlying defect formation mechanisms at different energies and requires revision when considering irradiation fields that contain a broader spectrum of particle types and energies.
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