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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/

    Cavity based X-ray free-electron lasers (CBXFEL) are next generation X-ray sources promising radiation with full three-dimensional coherence, nearly constant pulse to pulse stability and more than an order of magnitude higher spectral flux compared to SASE FELs. However, especially for the low gain X-ray free-electron laser oscillator (XFELO), the outcoupling of the radiation stored inside the cavity remains an issue, as only small outcoupling coefficients are tolerable. In this contribution, a scheme is proposed which exploits the polarization dependence of the crystal based X-ray diffraction, which poses the main reflection mechanism for forming the X-ray cavity. Especially for reflections close to a 45° Bragg-angle, as is proposed for the proof of concept experiment at the Linac Coherent Light Source (LCLS) at the Stanford Linear Accelerator (SLAC), the polarization dependence of the reflection coefficient becomes very strong. By properly setting up the polarization of the FEL radiation with respect to the reflection direction, a very simple, yet potent and tunable outcoupling mechanism can be realized. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 19 May 2023; [Geneva] : JACoW Publishing 1839-1842 (2023). doi:10.18429/JACoW-IPAC2023-TUPL037 Published by JACoW Publishing, [Geneva]

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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    Journal of Physics : Conference Series
    Article . 2024 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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      Journal of Physics : Conference Series
      Article . 2024 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Aftab, Namra; Boonpornprasert, Prach; Georgiev, Georgi; Good, James David; +12 Authors

    Methodical studies to improve the existing e-beam Longitudinal Phase Space (LPS) tomography were performed at the Photo Injector Test facility at DESY in Zeuthen. Proof-of-principle simulations were done to address some core concerns e.g. booster phase range, space charge effects and noisy artefacts in results. Phase advance analysis was done with the help of an analytical model that determined the booster phase range and step size. A slit was introduced before the booster to truncate the beam and reduce space charge forces. The reconstruction method adopted was image space reconstruction algorithm owing to its assurance of non-negative solution. An initial scientific presumption of LPS from low energy momentum measurements was established to reduce artefacts in the phase space. This paper will explain the proof-of-principle simulations highlighting the key aspects to obtain accurate results. Reconstructed LPS for different experimental cases will be presented to demonstrate the diagnostic capability. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 4601 - 4604 (2023). doi:10.18429/JACoW-IPAC2023-THPL073 Published by JACoW Publishing, Geneva, Switzerland

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    Journal of Physics : Conference Series
    Article . 2024 . Peer-reviewed
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      Journal of Physics : Conference Series
      Article . 2024 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Christmann, J.; De Gersem, H.; von Tresckow, M.; Aloev, A.; +3 Authors

    The new fourth-generation synchrotron radiation source PETRA IV at DESY (Hamburg) will use a fast orbit feedback system to meet stringent orbit stability requirements. To this end, hundreds of fast orbit corrector magnets will be installed to minimize orbit distortions from external sources. These magnets are operated at high frequencies, creating strong eddy currents that result in Joule losses and a time delay between the applied voltage and the aperture field. User experiments impose stringent requirements on beam operation to preserve the point of the radiation source. To meet the demanding feedback requirements, finite element simulations are needed to understand the characteristics of the fast corrector magnet and its environment. However, due to the low skin depths at high frequencies and the laminated structure of the magnets' yoke, conducting finite element simulations of the fast correctors is computationally very demanding. Therefore, we homogenize the laminated yoke which drastically reduces the computational effort but still captures the eddy current effects accurately. The homogenization technique reduces simulation times from several hours to just a few minutes, allowing us to conduct extensive studies of the power losses, the field quality, and the integrated transfer functions of the magnets. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 3667 - 3670 (2023). doi:10.18429/JACOW-IPAC2023-WEPM049 Published by JACoW Publishing, Geneva, Switzerland

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ DESY Publication Dat...arrow_drop_down
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    Journal of Physics : Conference Series
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ DESY Publication Dat...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Journal of Physics : Conference Series
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stacey, Blae; Assmann, Ralph; Hillert, Wolfgang; Kuropka, Willi; +1 Authors

    Dielectric gratings are used in Dielectric Laser Acceleration due to their high damage thresholds in high acceleration gradients. When an electron bunch passes close to these gratings, it emits radiation, and the features of this radiation will be dependent on the beam position relative to the grating, the bunch charge, and the bunch length. A compact high-resolution diagnostic device will be developed that consists of multiple dielectric gratings with different periodicities; these types of devices are required for the accurate operation of future compact accelerators which are currently undergoing development and testing. The ARES linac at DESY is able to provide sub-fs electron bunches and has a range of high-resolution diagnostic devices installed, such as the PolariX Transverse Deflecting Structure, which will allow for performance verification of a new diagnostic. The electron bunches can be altered, allowing for the measurement and analysis of the emitted radiation for different bunch lengths and charges. This work will present the current progress in this area, including the presentation and discussion of simulations, and a discussion of the planned experiments at ARES. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Acceleration Conference , IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 4609 - 4611 (2023). doi:10.18429/JACOW-IPAC2023-THPL075 Published by JACoW Publishing, Geneva, Switzerland

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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    Journal of Physics : Conference Series
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Schreiber, Siegfried; Brinker, Frank; Lederer, Sven; Monaco, Laura; +2 Authors

    The photoinjectors of FLASH at DESY (Hamburg, Germany) and the European XFEL are operated by laser driven RF-guns. In both facilities cesium telluride photocathodes are successfully used since several years. We present recent data on the lifetime, quantum efficiency (QE), and dark current of the photocathodes currently in operation. In addition we present recent design changes in the photocathode transfer systems in order to further improve the cathode handling. 40th International Free Electron Laser Conference, FEL2022, Trieste, Italy, 22 Aug 2022 - 26 Aug 2022; JACoW Publishing 171-174 pages2.1 MB (2023). doi:10.18429/JACOW-FEL2022-TUP07 Published by JACoW Publishing

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      Journal of Physics : Conference Series
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    Authors: Yamin, Sumera; Assmann, Ralph; Vinatier, Thomas; Kuropka, Willi; +5 Authors

    ARES is an electron linear accelerator at the SINBAD facility at DESY. It aims to deliver reliable high-brightnessbeams with an energy in the range of 50 MeV to 150 MeVwith fs to sub-fs bunch lengths. This is ideal for injection intonovel high-gradient acceleration devices, such as dielectriclaser accelerators (DLA), accelerator components R&D andmedical applications. The ARES linac has been recentlycommissioned. Here we report the results of beam basedalignment of focusing solenoids of ARES. The alignmentis an important part of commissioning and is crucial for thebeam quality. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; [Geneva] : JACoW Publishing 1709-1712 (2023). doi:10.18429/JACoW-IPAC2023-TUPA174 Published by JACoW Publishing, [Geneva]

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    Authors: Amirkhanyan, Zohrab Gevorg; Aboulbanine, Zakaria; Grebinyk, Anna; Gross, Matthias; +10 Authors

    The aim of this work is to demonstrate the principal possibility to enhance the electron beam dose deposition in the depth of the sample for radiation therapy purposes. Trains of electron bunches of 22 MeV generated at PITZ are focused inside the sample using a dedicated fast deflector and a solenoid magnet. To explore the capabilities of the proposed setup, dose distributions are calculated for multiple electron bunches focused in a single point inside a water phantom. Electron beam focusing produces dose peaks with a tunable maximal dose depth which is interesting for healthy tissue sparing at the surface and enhancing treatment quality. The duration of the full bunch train is 1 ms. During this time interval, the FLASH effect could be efficiently triggered inside the irradiated target volume. Monte Carlo simulations based on the FLUKA code were performed to evaluate the depth dose curves distributions in a water phantom. Using the PITZ electron beam parameters, simulations have shown the possibility to produce a peak dose in water seven times higher than compared to the dose at the surface. Moreover, the RMS size homogeneous area around the maximal dose is approximately 25 mm. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva : JACoW Publishing 5000 - 5003 (2023). doi:10.18429/JACoW-IPAC2023-THPM050 Published by JACoW Publishing, Geneva

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    Authors: Amirkhanyan, Zohrab Gevorg; Aftab, Namra; Adhikari, Gowri Dulanjalee; Boonpornprasert, Prach; +14 Authors

    The high-brightness electron beam at the Photo Injector Test facility at DESY in Zeuthen (PITZ) is now also used for FLASHlab@PITZ: an R&D platform for studying radiation biology and the FLASH effect in radiation therapy. The available parameter space of the electron beam with a momentum of 22 MeV/c allows bunch charges from 10 pC up to 5nC, bunch duration of 0.1–60ps, and bunch train lengths up to 1 ms. The number of bunches in the single train can currently be varied between 1 and 1000 bunches, with an upgrade to 4500 foreseen in 2023. Radiation biology studies require accurate dose prediction, therefore Monte Carlo simulations based on the FLUKA code were performed. According to estimations, dose delivery of 0.002Gy (low charge case 0.1pC) and 10Gy (high charge case 5nC) is possible, if the beam is confined to a circular area with a radius of 5 mm with a lead collimator. For the Monte Carlo simulations, the experimental setup was accurately modeled, including the exit window, lead collimator, etc. Dose measurements were used to compare simulations with experiments. Dose profiles were experimentally measured with Gafchromic films and then compared with Monte Carlo simulations. The first experiments at FLASHlab@PITZ in 2023 have demonstrated flexible dose options for studying the FLASH effect and radiation biology studies [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva : JACoW Publishing 4996 - 4999 (2023). doi:10.18429/JACoW-IPAC2023-THPM049 Published by JACoW Publishing, Geneva

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    Authors: Géraldine Servant; Peera Simakachorn;

    Models that produce Axion-Like-Particles (ALP) after cosmological inflation due to spontaneous $U(1)$ symmetry breaking also produce cosmic string networks. Those axionic strings lose energy through gravitational wave emission during the whole cosmological history, generating a stochastic background of gravitational waves that spans many decades in frequency. We can therefore constrain the axion decay constant and axion mass from limits on the gravitational wave spectrum and compatibility with dark matter abundance as well as dark radiation. We derive such limits from analyzing the most recent NANOGrav data from Pulsar Timing Arrays (PTA). The limits are compatible with the slightly stronger $N_{\rm eff}$ bounds on dark radiation for ALP masses $m_a \lesssim 10^{-10}$ eV. On the other hand, for heavy ALPs with $m_a\gtrsim 0.1$ GeV and $N_{\rm DW}\neq 1$, new regions of parameter space can be probed by PTA data due to the dominant Domain-Wall contribution to the gravitational wave background. Physical review / D 108(12), 123516 (2023). doi:10.1103/PhysRevD.108.123516 Published by American Physical Society, Ridge, NY

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    Authors: Sol��rzano-Kraemer, M��nica M.; Bourdeau, Cl��ment; Rosse-Guillevic, Simon; Hammel, J��rg U.; +2 Authors

    Phorid flies are an abundant and diverse dipteran family in modern faunas, yet poorly represented in the fossil record. Here, we describe the first fossil species of the millipede parasitizing genus Myriophora, M. asiatica n. sp., and three new fossil species of the ant parasitizing genus Apocephalus, A. miocenus n. sp., A. dominicanus n. sp., and A. chiapanecus n. sp. discovered in Miocene amber deposits from China, Dominican Republic, and Mexico, respectively. Moreover, we add details on the species Apocephalus succineus Brown, previously described in Dominican amber, with the observation of a new specimen. We also include a dichotomous key for all Apocephalus species described in the fossil record. Palaeoworld x, S1871174X21000913 (1-17) (2021). doi:10.1016/j.palwor.2021.11.002 Published by Elsevier, Amsterdam [u.a.]

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/

    Cavity based X-ray free-electron lasers (CBXFEL) are next generation X-ray sources promising radiation with full three-dimensional coherence, nearly constant pulse to pulse stability and more than an order of magnitude higher spectral flux compared to SASE FELs. However, especially for the low gain X-ray free-electron laser oscillator (XFELO), the outcoupling of the radiation stored inside the cavity remains an issue, as only small outcoupling coefficients are tolerable. In this contribution, a scheme is proposed which exploits the polarization dependence of the crystal based X-ray diffraction, which poses the main reflection mechanism for forming the X-ray cavity. Especially for reflections close to a 45° Bragg-angle, as is proposed for the proof of concept experiment at the Linac Coherent Light Source (LCLS) at the Stanford Linear Accelerator (SLAC), the polarization dependence of the reflection coefficient becomes very strong. By properly setting up the polarization of the FEL radiation with respect to the reflection direction, a very simple, yet potent and tunable outcoupling mechanism can be realized. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 19 May 2023; [Geneva] : JACoW Publishing 1839-1842 (2023). doi:10.18429/JACoW-IPAC2023-TUPL037 Published by JACoW Publishing, [Geneva]

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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    Journal of Physics : Conference Series
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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      Journal of Physics : Conference Series
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Aftab, Namra; Boonpornprasert, Prach; Georgiev, Georgi; Good, James David; +12 Authors

    Methodical studies to improve the existing e-beam Longitudinal Phase Space (LPS) tomography were performed at the Photo Injector Test facility at DESY in Zeuthen. Proof-of-principle simulations were done to address some core concerns e.g. booster phase range, space charge effects and noisy artefacts in results. Phase advance analysis was done with the help of an analytical model that determined the booster phase range and step size. A slit was introduced before the booster to truncate the beam and reduce space charge forces. The reconstruction method adopted was image space reconstruction algorithm owing to its assurance of non-negative solution. An initial scientific presumption of LPS from low energy momentum measurements was established to reduce artefacts in the phase space. This paper will explain the proof-of-principle simulations highlighting the key aspects to obtain accurate results. Reconstructed LPS for different experimental cases will be presented to demonstrate the diagnostic capability. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 4601 - 4604 (2023). doi:10.18429/JACoW-IPAC2023-THPL073 Published by JACoW Publishing, Geneva, Switzerland

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Christmann, J.; De Gersem, H.; von Tresckow, M.; Aloev, A.; +3 Authors

    The new fourth-generation synchrotron radiation source PETRA IV at DESY (Hamburg) will use a fast orbit feedback system to meet stringent orbit stability requirements. To this end, hundreds of fast orbit corrector magnets will be installed to minimize orbit distortions from external sources. These magnets are operated at high frequencies, creating strong eddy currents that result in Joule losses and a time delay between the applied voltage and the aperture field. User experiments impose stringent requirements on beam operation to preserve the point of the radiation source. To meet the demanding feedback requirements, finite element simulations are needed to understand the characteristics of the fast corrector magnet and its environment. However, due to the low skin depths at high frequencies and the laminated structure of the magnets' yoke, conducting finite element simulations of the fast correctors is computationally very demanding. Therefore, we homogenize the laminated yoke which drastically reduces the computational effort but still captures the eddy current effects accurately. The homogenization technique reduces simulation times from several hours to just a few minutes, allowing us to conduct extensive studies of the power losses, the field quality, and the integrated transfer functions of the magnets. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 3667 - 3670 (2023). doi:10.18429/JACOW-IPAC2023-WEPM049 Published by JACoW Publishing, Geneva, Switzerland

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ DESY Publication Dat...arrow_drop_down
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    Journal of Physics : Conference Series
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      Journal of Physics : Conference Series
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stacey, Blae; Assmann, Ralph; Hillert, Wolfgang; Kuropka, Willi; +1 Authors

    Dielectric gratings are used in Dielectric Laser Acceleration due to their high damage thresholds in high acceleration gradients. When an electron bunch passes close to these gratings, it emits radiation, and the features of this radiation will be dependent on the beam position relative to the grating, the bunch charge, and the bunch length. A compact high-resolution diagnostic device will be developed that consists of multiple dielectric gratings with different periodicities; these types of devices are required for the accurate operation of future compact accelerators which are currently undergoing development and testing. The ARES linac at DESY is able to provide sub-fs electron bunches and has a range of high-resolution diagnostic devices installed, such as the PolariX Transverse Deflecting Structure, which will allow for performance verification of a new diagnostic. The electron bunches can be altered, allowing for the measurement and analysis of the emitted radiation for different bunch lengths and charges. This work will present the current progress in this area, including the presentation and discussion of simulations, and a discussion of the planned experiments at ARES. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Acceleration Conference , IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva, Switzerland : JACoW Publishing 4609 - 4611 (2023). doi:10.18429/JACOW-IPAC2023-THPL075 Published by JACoW Publishing, Geneva, Switzerland

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of Physics :...arrow_drop_down
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    Journal of Physics : Conference Series
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      Journal of Physics : Conference Series
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    Authors: Schreiber, Siegfried; Brinker, Frank; Lederer, Sven; Monaco, Laura; +2 Authors

    The photoinjectors of FLASH at DESY (Hamburg, Germany) and the European XFEL are operated by laser driven RF-guns. In both facilities cesium telluride photocathodes are successfully used since several years. We present recent data on the lifetime, quantum efficiency (QE), and dark current of the photocathodes currently in operation. In addition we present recent design changes in the photocathode transfer systems in order to further improve the cathode handling. 40th International Free Electron Laser Conference, FEL2022, Trieste, Italy, 22 Aug 2022 - 26 Aug 2022; JACoW Publishing 171-174 pages2.1 MB (2023). doi:10.18429/JACOW-FEL2022-TUP07 Published by JACoW Publishing

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    Journal of Physics : Conference Series
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      Journal of Physics : Conference Series
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    Authors: Yamin, Sumera; Assmann, Ralph; Vinatier, Thomas; Kuropka, Willi; +5 Authors

    ARES is an electron linear accelerator at the SINBAD facility at DESY. It aims to deliver reliable high-brightnessbeams with an energy in the range of 50 MeV to 150 MeVwith fs to sub-fs bunch lengths. This is ideal for injection intonovel high-gradient acceleration devices, such as dielectriclaser accelerators (DLA), accelerator components R&D andmedical applications. The ARES linac has been recentlycommissioned. Here we report the results of beam basedalignment of focusing solenoids of ARES. The alignmentis an important part of commissioning and is crucial for thebeam quality. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; [Geneva] : JACoW Publishing 1709-1712 (2023). doi:10.18429/JACoW-IPAC2023-TUPA174 Published by JACoW Publishing, [Geneva]

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      Journal of Physics : Conference Series
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    Authors: Amirkhanyan, Zohrab Gevorg; Aboulbanine, Zakaria; Grebinyk, Anna; Gross, Matthias; +10 Authors

    The aim of this work is to demonstrate the principal possibility to enhance the electron beam dose deposition in the depth of the sample for radiation therapy purposes. Trains of electron bunches of 22 MeV generated at PITZ are focused inside the sample using a dedicated fast deflector and a solenoid magnet. To explore the capabilities of the proposed setup, dose distributions are calculated for multiple electron bunches focused in a single point inside a water phantom. Electron beam focusing produces dose peaks with a tunable maximal dose depth which is interesting for healthy tissue sparing at the surface and enhancing treatment quality. The duration of the full bunch train is 1 ms. During this time interval, the FLASH effect could be efficiently triggered inside the irradiated target volume. Monte Carlo simulations based on the FLUKA code were performed to evaluate the depth dose curves distributions in a water phantom. Using the PITZ electron beam parameters, simulations have shown the possibility to produce a peak dose in water seven times higher than compared to the dose at the surface. Moreover, the RMS size homogeneous area around the maximal dose is approximately 25 mm. [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva : JACoW Publishing 5000 - 5003 (2023). doi:10.18429/JACoW-IPAC2023-THPM050 Published by JACoW Publishing, Geneva

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    Authors: Amirkhanyan, Zohrab Gevorg; Aftab, Namra; Adhikari, Gowri Dulanjalee; Boonpornprasert, Prach; +14 Authors

    The high-brightness electron beam at the Photo Injector Test facility at DESY in Zeuthen (PITZ) is now also used for FLASHlab@PITZ: an R&D platform for studying radiation biology and the FLASH effect in radiation therapy. The available parameter space of the electron beam with a momentum of 22 MeV/c allows bunch charges from 10 pC up to 5nC, bunch duration of 0.1–60ps, and bunch train lengths up to 1 ms. The number of bunches in the single train can currently be varied between 1 and 1000 bunches, with an upgrade to 4500 foreseen in 2023. Radiation biology studies require accurate dose prediction, therefore Monte Carlo simulations based on the FLUKA code were performed. According to estimations, dose delivery of 0.002Gy (low charge case 0.1pC) and 10Gy (high charge case 5nC) is possible, if the beam is confined to a circular area with a radius of 5 mm with a lead collimator. For the Monte Carlo simulations, the experimental setup was accurately modeled, including the exit window, lead collimator, etc. Dose measurements were used to compare simulations with experiments. Dose profiles were experimentally measured with Gafchromic films and then compared with Monte Carlo simulations. The first experiments at FLASHlab@PITZ in 2023 have demonstrated flexible dose options for studying the FLASH effect and radiation biology studies [Ebook] IPAC'23 : 14th International Particle Accelerator Conference, 7-12 May 2023, Venice, Italy : proceedings / hosting institutions: INFN, Elettra Sincotrone Trieste , [Geneva] : JACoW Publishing, [2023], 14th International Particle Accelerator Conference, IPAC2023, Venice, Italy, 7 May 2023 - 12 May 2023; Geneva : JACoW Publishing 4996 - 4999 (2023). doi:10.18429/JACoW-IPAC2023-THPM049 Published by JACoW Publishing, Geneva

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    Authors: Géraldine Servant; Peera Simakachorn;

    Models that produce Axion-Like-Particles (ALP) after cosmological inflation due to spontaneous $U(1)$ symmetry breaking also produce cosmic string networks. Those axionic strings lose energy through gravitational wave emission during the whole cosmological history, generating a stochastic background of gravitational waves that spans many decades in frequency. We can therefore constrain the axion decay constant and axion mass from limits on the gravitational wave spectrum and compatibility with dark matter abundance as well as dark radiation. We derive such limits from analyzing the most recent NANOGrav data from Pulsar Timing Arrays (PTA). The limits are compatible with the slightly stronger $N_{\rm eff}$ bounds on dark radiation for ALP masses $m_a \lesssim 10^{-10}$ eV. On the other hand, for heavy ALPs with $m_a\gtrsim 0.1$ GeV and $N_{\rm DW}\neq 1$, new regions of parameter space can be probed by PTA data due to the dominant Domain-Wall contribution to the gravitational wave background. Physical review / D 108(12), 123516 (2023). doi:10.1103/PhysRevD.108.123516 Published by American Physical Society, Ridge, NY

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    Authors: Sol��rzano-Kraemer, M��nica M.; Bourdeau, Cl��ment; Rosse-Guillevic, Simon; Hammel, J��rg U.; +2 Authors

    Phorid flies are an abundant and diverse dipteran family in modern faunas, yet poorly represented in the fossil record. Here, we describe the first fossil species of the millipede parasitizing genus Myriophora, M. asiatica n. sp., and three new fossil species of the ant parasitizing genus Apocephalus, A. miocenus n. sp., A. dominicanus n. sp., and A. chiapanecus n. sp. discovered in Miocene amber deposits from China, Dominican Republic, and Mexico, respectively. Moreover, we add details on the species Apocephalus succineus Brown, previously described in Dominican amber, with the observation of a new specimen. We also include a dichotomous key for all Apocephalus species described in the fossil record. Palaeoworld x, S1871174X21000913 (1-17) (2021). doi:10.1016/j.palwor.2021.11.002 Published by Elsevier, Amsterdam [u.a.]

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