BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Material Characterizations in the Sub-THz Region for Particle Acce lerators DTSTART;VALUE=DATE-TIME:20240220T152000Z DTEND;VALUE=DATE-TIME:20240220T154000Z DTSTAMP;VALUE=DATE-TIME:20261017T062302Z UID:indico-contribution-239-1140@cern.ch DESCRIPTION:Speakers: Andrea Passarelli (INFN - Sezione di Napoli)\nCoatin gs play a crucial role for the functionality of vacuum chambers in particl e accelerators\, serving dual purposes by efficiently facilitating pumping and mitigating electron cloud effects. However\, their impact on the surf ace resistance of chamber walls raises concerns\, potentially influencing machine performances and imposing limitations on achievable energies and c urrents. Therefore\, an electromagnetic characterization is essential for a comprehensive study of accelerator structures\, particularly in the cont ext of the next generation of particle accelerators where the demand for e xtremely short bunches accentuates the importance of assessing material re sponses in the sub-THz region.\n\nIn this presentation\, we focus on the e lectromagnetic characterization of three different types of Non-Evaporable Getters (NEG) coatings. Specifically\, we examine the CERN standard\, a d ensified film using HiPIMS\, and porous\, high-pressure coated. NEG coatin gs are particularly utilized to achieve conditions of ultra-high vacuum. A dditionally\, we explore the characterization of Amorphous Carbon (a-C)\, necessitating a modification of the setup. a-C is primarily employed for m itigating the electron cloud effect.\n\nThrough this presentation\, we wil l showcase the electromagnetic characterization of these coating materials using a time-domain method based on THz waveguide spectroscopy. This adva nced methodology allows for a comprehensive exploration of the electromagn etic properties of coatings\, providing valuable insights into their behav ior within the sub-THz frequency range. The findings contribute to a deepe r understanding of the intricate interactions between coatings and acceler ator structures\, with the aim of optimizing performance and efficiency in the evolving landscape of particle acceleration technologies.\n\nhttps:// indico.unina.it/event/75/contributions/1140/ LOCATION:Federico II Conference Center Aula B URL:https://indico.unina.it/event/75/contributions/1140/ END:VEVENT BEGIN:VEVENT SUMMARY:The LNF IR-THz beamline @ DAϕNE: experimental set-ups and perspec tives DTSTART;VALUE=DATE-TIME:20240220T150000Z DTEND;VALUE=DATE-TIME:20240220T152000Z DTSTAMP;VALUE=DATE-TIME:20261017T062302Z UID:indico-contribution-239-1146@cern.ch DESCRIPTION:Speakers: Lucilla Pronti (INFN-LNF)\nThe INFN-LNF DAϕNE stora ge ring produces a powerful source of Synchrotron Radiation in the THz ran ge [1]. The brilliance of SR in the THz domain is up to three orders of ma gnitude with respect to conventional sources (i.e. mercury lamps)\, as sho wn in Figure 1\, and the flux increases with the electron current stored. These aspects permit to perform experiments in several field from material science to biology and chemistry and offer the possibility to analyze sam ples in solid\, liquid and gas phases [2-8]. Experimental set-ups availabl e at SINBAD beamline and applications are presented. Moreover\, prospectiv es of the Terahertz (THz) technology applied on cultural heritage field wi ll be described [9\,10].\n\nReferences\n\n1. Cestelli Guidi\, M.\; Piccini ni M.\, Marcelli A.\, Nucara A\, Calvani P.\, Burattini E.\; Optical perfo rmances of SINBAD\, the Synchrotron INfrared Beamline At DAϕNE. J. Opt. S oc. Am. 2005\, 22\, 2810- 2817.\n2. Cestelli Guidi M.\, Hotra O.\, Popov A. I.\, Optical and Vibrational Spectra of CsCl-Enriched GeS2-Ga2S3 Glasse s Halyna Klym\, Ivan Karbovnyk\, Nanoscale Research Letters\, 2016\, 11(1) :132.\n3. D’Apuzzo F.\, Piacenti A. R.\, Giorgianni F.\, Autore M.\, Ces telli Guidi M.\, Marcelli A.\, Schade U.\, Ito Y.\, Chen M.\, Lupi S.\, Te rahertz and mid-infrared plasmons in three-dimensional nanoporous graphene \, Nature Communications\, 2017\, 8\, 14885.\n4. Rider M. S.\, Sokolikova M.\, Hanham S. M.\, Navarro-Cia M.\, Haynes P. D.\, Lee D. K. K.\, Daniel e M.\, Cestelli Guidi M.\, Mattevi C.\, Lupi S.\, Giannini V.\, Experiment al signature of a topological quantum dot\, Nanoscale\, 2020\, 12\, 22817- 22825. \n5. Giuntini L.\, Castelli L.\, Massi M.\, Fedi M.\, Czelusniak C. \, Gelli N.\, Liccioli L.\, Giambi F.\, Ruberto C.\, Mazzinghi A.\, Barone S.\, Marchegiani F.\, Nisi S.\, Lubritto C.\, Altieri S.\, Tortora L.\, B ranchini P.\, Fabbri A.\, Graziani V.\, Barcellos Lins S.\, Guidorzi L.\, Lo Giudice A.\, Re A.\, Sottili L.\, Balerna A.\, Cestelli Guidi M.\, Pron ti L.\, Romani M.\, Albertin F.\, Bettuzzi M.\, Brancaccio R..\, Morigi M. P.\, Alloni D.\, Salvini A.\, Smilgys B.\, Prata M.\, Altieri S.\, Bonesi ni M.\, Di Martino D.\, Clemenza M.\, Carpinelli M.\, Oliva P.\, Sipala V. \, Gueli A. M.\, Pasquale S.\, Stella G.\, Pepponi G.\, Grazzi F.\, Taccet ti F.\, Detectors and Cultural Heritage: The INFN-CHNet Experience\, Appli ed Sciences\, 2021\, 11\, 3462.\n6. Tomarchio L.\, Macis S.\, D'Arco A.\, Grilli A.\, Romani M.\, Cestelli Guidi M.\, Hu K.\, Kukunuri S.\, Jeong S. \, Marcelli A.\, Ito Y.\, Mou S.\, Lupi S. Disordered Photonics Behavior f rom Terahertz to Ultraviolet of a 3- Dimensional Graphene Network\, NPG As ia Materials\, 2021\, 13\, 73\, 8.\n7. Tomarchio L.\, Mosesso L.\, Macis S .\, Grilli A.\, Romani M.\, Cestelli Guidi M.\, Zhu Z.\, Feng X.\, Zacchig na M.\, Petrarca M.\, He K.\, Lupi S.\, Electrodynamics of MnBi2Te4 Intrin sic Magnetic Topological Insulator\, Electrodynamics of MnBi2Te4 intrinsic magnetic topological insulators\, NPG Asia Mater\, 2022\, 14\, 82\, 7. \n 8. Tomarchio L.\, Mosesso L.\, Macis S.\, Nguyen L. T.\, Grilli A.\, Roman i M.\, Cestelli Guidi M.\, Cava R. J.\, Lupi S.\, Phonon Anharmonicity and Spin–Phonon Coupling in CrI3\, Materials\, 2023\, 16\, 4909. \n9. Cosen tino A.\, Terahertz and Cultural Heritage Science Examination of Art and A rchaeology\, Technologies\, 2016\, 4(6)\, 1-13\n10. Fukunaga K.\, THz Tech nology Applied to Cultural Heritage in Practice\, Springer Tokyo\, 2016\, 144.\n\nhttps://indico.unina.it/event/75/contributions/1146/ LOCATION:Federico II Conference Center Aula B URL:https://indico.unina.it/event/75/contributions/1146/ END:VEVENT BEGIN:VEVENT SUMMARY:Underway Projects for Innovative THz/IR Sources based on Particle Accelerators: SISSI 2.0 and SABINA DTSTART;VALUE=DATE-TIME:20240220T144000Z DTEND;VALUE=DATE-TIME:20240220T150000Z DTSTAMP;VALUE=DATE-TIME:20261017T062302Z UID:indico-contribution-239-1143@cern.ch DESCRIPTION:Speakers: Lorenzo Mosesso (Sapienza\, University of Rome\, Dep artment of Physics)\nTerahertz/Infrared (THz/IR) radiation and technologie s have found incredible development in the last few decades due to their a pplications in many different fields\, ranging from indoor and outdoor com munication\, security\, environmental monitoring\, biological research\, m edical applications and finally as a spectroscopic investigation tool in c ondensed matter [1]. However\, many of these applications requires increas ingly high-power sources and demands for the possibility to manipulate rad iation features such as pulse time duration\, frequency spectrum and polar ization. One of the most efficient ways of generating THz/IR radiation ful filling these requirements is to use relativistic electrons accelerated in storage rings\, where synchrotron radiation can be generated by means of bending magnets or specific Insertion Devices (IDs)\, or by accelerating e lectrons in LINACs\, where the development of FEL technologies allows for coherent and monochromatic radiation to be produced.\n \nFew projects are currently underway for the realization or the upgrade of innovative THz/IR sources based on particle acceleration\, some of them involving two of th e most important research facilities in Italy\, i.e. the third-generation synchrotron Elettra in Trieste and the SPARC_LAB linear accelerator in Fra scati.\n\nElettra 2.0 is a major upgrade of the Elettra facility towards w hat is called the ‘ultimate’ light source\, which will allow both hori zontal and vertical emittance to be greatly reduced in order to guarantee a substantial increase in brilliance and coherence for the emitted radiati on. The main work on the structure consists in the upgrade of the magnetic optics without changing the basic features of the accelerator [2] and it will involve all the beamlines\, including SISSI (Synchrotron Infrared Sou rce for Spectroscopy and Imaging)\, which is the line dedicated to the col lection of THz/IR radiation emitted by magnetic dipoles. The SISSI 2.0 Pro ject is included in this major upgrade and aims to characterize the radiat ion produced by this beamline focusing on the interference effects and on the emergence of new edge radiation contributions caused by the complex ma gnetic structure of the new multi-bend achromats. In addition\, the projec t involves the reorganization of the extraction beamline for the transport of radiation to an external user facility.\n\nThe same spirit of innovati on is embodied by the SABINA project\, which aims to make some major upgra des in the SPARC_LAB structure with the practical goal of realizing a FEL beamline operating as a user facility and producing quasi-monochromatic ra diation over a wide spectral range from 3 THz up to 30 THz\, with time dur ation pulses on the order of ps and energies in the mJ range. The core of the beamline consists of a series of three undulators based on the APPLE-X design that allows the emission of high intensity synchrotron radiation a nd the manipulation of high electric fields (˜10 MV/cm) by controlling th eir polarizations (linear\, circular and elliptical). The beamline also in cludes the transport of the produced radiation to an ‘open to user’ la boratory which will be equipped with the appropriate optical set-up necess ary to perform a wide variety of scientific experiments concerning nonline ar and time-resolved optical spectroscopy.\n\nhttps://indico.unina.it/even t/75/contributions/1143/ LOCATION:Federico II Conference Center Aula B URL:https://indico.unina.it/event/75/contributions/1143/ END:VEVENT BEGIN:VEVENT SUMMARY:Terahertz saturable absorption from relativistic high-temperature thermodynamics in black phosphorus DTSTART;VALUE=DATE-TIME:20240220T140000Z DTEND;VALUE=DATE-TIME:20240220T144000Z DTSTAMP;VALUE=DATE-TIME:20261017T062302Z UID:indico-contribution-239-1144@cern.ch DESCRIPTION:Speakers: Andrea Perucchi ()\nBlack phosphorus is a unique two -dimensional (2D) material (Figure 1) with a tunable infrared band gap and anisotropic conduction properties [1]. Black phosphorus also displays the occurrence of a pressure-induced topological Lifshitz transition turning the material from a narrow gap semiconductor to a massless Dirac metal due to a nonavoided band crossing [2]. We investigate the ambient pressure no nlinear terahertz (THz) electrodynamics of black phosphorus along the more conducting armchair direction and found that its THz saturable-absorption properties can be understood within a thermodynamic model by assuming a f ast thermalization of the electron bath [3]. While black phosphorus does n ot display the presence of massless fermions at ambient pressure and tempe rature the material's anomalous THz nonlinear properties can be accounted for by a relativistic massive Dirac dispersion\, provided that the Fermi t emperature is low enough. This suggests that an optimal tuning of the Ferm i level could be a strategy to engineer a strong THz nonlinear response in other massive Dirac materials\, such as transition-metal dichalcogenides or high-temperature superconductors\n\nhttps://indico.unina.it/event/75/co ntributions/1144/ LOCATION:Federico II Conference Center Aula B URL:https://indico.unina.it/event/75/contributions/1144/ END:VEVENT END:VCALENDAR