ALBA Synchrotron’s Post

We are pleased to announce that our manuscript entitled "Energetic, tunable, highly elliptically polarized higher harmonics generated by intense two-color counter-rotating laser fields" by E. Vassakis, S. Madas, et al." was accepted for publication in Physical Review A. This manuscript presents our experimental and theoretical effort on the development of the most energetic highly-elliptical polarized HHG beamline. This beamline was developed in Attosecond Science and Technology Laboratory (AST) of IESL-FORTH in Greece. The theoretical support was provided by the theory division of ELI-ALPS in Hungary and to be more specific by the group of Dr. Mousumi Upadhyay Kahaly. This new beamline developed in AST has unique characteristics. It provides the generation of tunable highly elliptical XUV radiation (17-26 eV) with controlled polarization, reaching energies at the range of 400 nJ at the source. This is the highest energy content ever achieved in the generation of laser driven circularly polarized XUV radiation. These ellipticity values in conjunction with the high energy content of the XUV pulses, reveal a source adequate for applications like control and imaging of ultrafast magnetism in magnetic materials, in ultrafast chiral matter investigations and also in the investigation of circular dichroism in atomic systems where intense highly-elliptical/cicrcularly polarized XUV radiation is necessary for inducing nonlinear processes. https://lnkd.in/dwAy6q-A

📚 Exciting New Publication Alert! 🚀 I'm thrilled to share our latest research, titled "Monte Carlo simulation for proton dosimetry in magnetic fields: Fano test and magnetic field correction factors kB for Farmer-type ionization chambers." You can read the full article here: https://lnkd.in/eN-yK2st 🔬 In this study, we developed a special Fano test for charged particles in the presence of magnetic fields using the MC code TOol for PArticle Simulation (TOPAS). We also determined magnetic field correction factors (k_B) for Farmer-type ionization chambers with proton beams. 🚀 Key Findings: - TOPAS successfully passed the Fano test for both electrons and protons in presence and absence of magnetic fields. - The chamber response (k_B,M,Q) depends on the chamber size and magnetic flux density, with local dose differences remaining minimal. - The magnetic field correction factor (k_B) for the PTW 30013 chamber ranged from 0.9946 to 1.0036 for both tested energies. - This work marks a significant advancement in proton dosimetry in presence of magnetic fields, contributing to the development of MR-guided proton therapy. 🌟 Our research extends the capabilities of TOPAS as a valuable tool for determining k_B and represents the first calculations of k_B for proton beams. I want to extend my heartfelt thanks to my co-authors for their invaluable contributions from the very beginning of this publication. 🙌 Thank you to all the collaborators and supporters who made this research possible. Your dedication and contributions are truly appreciated. Feel free to dive into the details by clicking the link above. If you have any questions or would like to discuss the findings further, please don't hesitate to reach out. 🌐💡 #Research #ProtonDosimetry #MagneticFields #MRgPT #MRinRT #MRguidance #Protontherapy #TOPAS #ScienceAdvances

📃Scientific paper: Have pulsar timing array methods detected a cosmological phase transition? Abstract: We show that the recent detection of a gravitational wave \(GW\) background reported by various pulsar timing array \(PTA\) collaborations including NANOGrav-15yr, PPTA, EPTA, and CPTA can be explained in terms of first order phase transitions \(FOPTs\) from dark sector models \(DSM\). Specifically, we explore a model for first order phase transitions that involves the majoron, a Nambu-Goldstone boson that is emerging from the spontaneous symmetry breaking of a $U\(1\)\_\{L\}$ or $U\(1\)\_\{B-L\}$ symmetry. We show how the predicted GW power spectrum, with a realistic choice of the FOPT parameters, is consistent with 1-$\sigma$ deviations from the estimated parameters of the background detected by the PTA collaborations. ;Comment: 4 pages, 1 figure Discover the rest of the scientific article on es/iode ➡️https://etcse.fr/8Kt

Don't miss out on our upcoming webinar! Join us as we showcase how to study the atmospheric processes through combining the fascinating capabilities from two DOE facilities. #ARM #ARMdata #EMSL

🫧 𝙐𝙣𝙫𝙚𝙞𝙡𝙞𝙣𝙜 𝙩𝙝𝙚 𝙨𝙚𝙘𝙧𝙚𝙩𝙨 𝙤𝙛 𝙛𝙤𝙖𝙢𝙨! 🫧 where minor variations in structure lead to major advancements in application and efficiency! 🧼🍨☕🖌️ With his review article just published in 𝘊𝘶𝘳𝘳𝘦𝘯𝘵 𝘖𝘱𝘪𝘯𝘪𝘰𝘯 𝘪𝘯 𝘊𝘰𝘭𝘭𝘰𝘪𝘥 & 𝘐𝘯𝘵𝘦𝘳𝘧𝘢𝘤𝘦 𝘚𝘤𝘪𝘦𝘯𝘤𝘦 (https://lnkd.in/dY6XRStG) Leonardo Chiappisi highlights several open challenges that could be addressed by #academic and #industry scientists using #neutron and #synchrotron radiation in Large Scale Facilities like ILL - Institut Laue Langevin and ESRF - The European Synchrotron. Read more: https://lnkd.in/d5N-BRER *** 💡 Easy, supported and coordinated access to the above mentioned large scale facilities equipments and instruments is also made possible through the ReMade@ARI calls for proposals - dedicated to #academia, #SMEs and #Industry scientists exploring the properties and structures of innovative materials for #CircularEconomy ♻ More info on : https://remade-project.eu/

📃Scientific paper: Vacuum polarization alters the spectra of accreting X-ray pulsars Abstract: It is a common belief that for magnetic fields typical for accreting neutron stars in High-Mass X-ray Binaries vacuum polarization only affects the propagation of polarized emission in the neutron star magnetosphere. We show that vacuum resonances can significantly alter the emission from the poles of accreting neutron stars. The effect is similar to vacuum polarization in the atmospheres of isolated neutron stars and can result in suppression of the continuum and the cyclotron lines. It is enhanced by magnetic Comptonization in the hot plasma and proximity to the electron cyclotron resonance. We present several models to illustrate the vacuum polarization effect for various optically thick media and discuss how the choice of polarization modes affects the properties of the emergent radiation by simulating polarized energy- and angle-dependent radiative transfer. Polarization effects, including vacuum polarization, crucially alter the emission properties. Together with strongly angle- and energy- dependent magnetic Comptonization, they result in a complex spectral shape, which can be described by dips and humps on top of a power-law-like continuum with high-energy cutoff. These effects provide a possible explanation for the common necessity of additional broad Gaussian components and two-component Comptonization models that are used to describe spectra of accreting X-ray pulsars. We also demonstrate the character of depolarization introduced by the radiation field's... Discover the rest of the scientific article on es/iode ➡️https://etcse.fr/Akg

Oh the old days! This is a photo from October 1968. It was work like this that inspired many to look deep into science from the subatomic to the planets and beyond. It is part of ISOLDE (Isotope Separator On-Line Device) Radioactive Ion Beam (RIB) Facility. An isotope separator facility located at CERN's first ever particle accelerator. From the control desk on the left, the proton beam from the particle accelerator could be monitored and the performance of the target and separator controlled. The ion beam containing the isotopes entered through the wall and was analyzed in the magnet. One of the beams could then be transported to the detectors. At the end of the pipe, on the right, was a tape system for collecting the isotopes. Isotopes became embedded in the tape and detectors could be brought to the tape for measurements, an electron detector⁴, above, and a gamma detector⁵, below, could be brought into position. That year, a system was being developed to make it possible to switch the ion beam to three users, increasing the number of experiments which could be performed simultaneously with ISOLDE.

In our recently published work in Scientific Reports, we have a proposed an analytical model to study graphene-based spatiotemporally modulated structures working at THz frequencies. Spatiotemporally modulated structures with periodic variations in one or more of their electromagnetic properties in both time and space exhibit interesting behaviours such as nonreciprocal response, asymmetric band gap in the dispersion diagram, frequency mixing, and mode conversion. These unique features make them a great candidate for development of integrated THz devices such as mixers, modulators, antennas, isolators, mode convertors, and circulators. https://lnkd.in/dbVzWznz

🎉 Exciting News! I'm happy to share that I had the opportunity to present my latest research at the 67th Annual Conference on Magnetism and Magnetic Materials 2023. 🎙📊 During the presentation, I discussed use of Operando Bragg Coherent Diffractive Imaging(OBCDI) to manipulate and characterize topological defects using magnetic fields. We used the facilities at Argonne National Laboratory, Advance Photon Source, 34 IDC for this experiment. It was inspiring to engage with fellow researchers and professionals who share a passion for Magnetism and Magnetic Materials. 🤝 🔍 Key Takeaways: • Successful manipulation of topological defects in multiferroic Barium Hexaferrite nanoparticles using Magnetic Fields • Three dimensional characterization of Topologies in nanoparticles • An asymmetric butterfly loop of strain vs magnetic field which is of immense importance in several applications. I want to express my gratitude to my advisor Prof Edwin Fohtung, my colleague Sowmya Srinivasan, and beamline scientist Dr. Ross Harder whose support made this research possible. 🙏 📣 I encourage you to check out the conference proceedings and explore the diverse range of topics covered by my fellow presenters. Let's continue pushing the boundaries of knowledge together! https://lnkd.in/gThZVt56 #materialsscience #materialsengineering #materialsresearch #materialcharacterization #conference2023 #conferencepresentation