Article
Physics, Multidisciplinary
M. A. W. van Ninhuijs, J. Beckers, O. J. Luiten
Summary: In this study, a resonant microwave cavity is used as a diagnostic tool to investigate ultracold plasmas (UCPs). Two possible causes for the deviation between experimental and theoretical plasma decay rates are proposed: plasma-wall interactions and collisional microwave heating. The effects of both causes on plasma lifetime are explored using analytical models and measurements. The results show that electron loss to cavity walls is the main reason for the discrepancy, and the electric field has a small but noticeable effect on plasma lifetime.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
Ashish Sharma, Rochan R. Upadhyay, Anand Karpatne, Vivek Subramaniam, Douglas Breden, Laxminarayan L. Raja
Summary: This study presents computational modeling of an all-dielectric resonant plasma discharge for processing atmospheric air streams, which involves efficient plasma breakdown, radical transport, and stable plasma generation. Operating in resonance mode results in significant electric field amplification in the dielectric gap, facilitating plasma generation and transport.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Chen Ze-Yu, Peng Yu-Bin, Wang Ruil, He Yong-Ning, Cui Wan-Zhao
Summary: Low-pressure discharge is a significant issue for the development of high-power and miniaturized microwave components in spacecraft. In order to understand the mechanism of low-pressure discharge in spacecraft microwave components, an emission spectroscopy diagnostic platform is constructed to study the plasma reaction dynamics and damage effect of low-pressure RF discharge. The study reveals that gas pressure can influence the concentration of different species in the plasma and the emission spectrum shows a linear increase with input power.
ACTA PHYSICA SINICA
(2022)
Article
Multidisciplinary Sciences
Tobias Kroker, Mario Grossmann, Klaus Sengstock, Markus Drescher, Philipp Wessels-Staarmann, Juliette Simonet
Summary: This study reports the creation of ultracold plasma by photoionization of a Bose-Einstein condensate with a femtosecond laser pulse, allowing direct access to electron temperature and revealing ultrafast cooling of electrons in an initially strongly coupled plasma.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Chi Chen, Wenjie Fu, Chaoyang Zhang, Dun Lu, Meng Han, Yang Yan
Summary: This paper presents a dual-frequency microwave plasma source based on a coaxial transmission line for flexible control of plasma characteristics. Experimental results show that plasma electron density and electron temperature can be adjusted by feeding in different frequencies, improving the operation frequency of dual-frequency microwave plasma sources.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Environmental
R. D'Ambrosio, A. Cintio, A. Lazzeri, G. Annino
Summary: The use of high-quality resonant cavities in microwave-assisted reactors is desirable for high energy efficiency. A general design method has been proposed to achieve defined mode density and high microwave power dissipation in the sample, with the most efficient heating mode determined through rigorous numerical analysis.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Fluids & Plasmas
Mauricio Isoldi, Edson Moriyoshi Ozono, Ronaldo Domingues Mansano
Summary: There are various configurations of MWCVD reactor, with the common characteristic of waveguides. Replacing waveguides with resonant cavities can help produce dense plasma, allowing for the deposition of SiO2 films on silicon substrates at room temperature. The system performs excellently, with the resulting film of satisfactory quality.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Physics, Fluids & Plasmas
Federico Boni, Victor Desangles, Julien Jarrige
Summary: This article introduces a correction method for plasma sheath effects that occur when measuring electron density using a microwave resonant probe immersed in plasma. The method is developed based on evaluating the operation of the resonant probe and its interface with the plasma. Numerical simulations are used to independently develop the correction method. Experimental results demonstrate that the method significantly improves the accuracy of electron density measurements, and potential improvements are also discussed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Optics
L. F. Keary, J. D. Pritchard
Summary: In this paper, we investigate the observation of quantum nature of strong coupling at finite temperatures using a hybrid system of a superconducting cavity and a multilevel Rydberg atom. We demonstrate that it is possible to cool the thermal microwave mode towards the ground state, enabling the observation of coherent vacuum Rabi oscillations even at 4 K.
Article
Physics, Applied
Sumit Bera, Prakash Behera, R. Venkatesh, V. Ganesan
Summary: The magnetotransport and thermal properties of microwave-synthesized nanostructured Bi2Te3 were studied in detail, revealing a disorderly metal-like behavior at high temperatures and a tendency towards localization at low temperatures. The normalized conductivity showed sharp changes in slopes with magnetic fields, indicating dominance of electron-electron interaction and quantum interference effect in transport. Additionally, a transition from positive to negative Coulomb screening factor in Bi2Te3 was observed.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Education, Scientific Disciplines
J. Oliveira, D. Hachmeister, P. D. Lourenco, J. Brotankova, H. Fernandes
Summary: Plasmas are closely related to microwave science, with the fundamental properties of plasmas originating from their plasma frequency. Combining plasma physics with electromagnetic wave propagation poses a challenge for students, but using an EM cavity provides a great opportunity to understand EM standing waves and the impact of free charges in plasmas. Introducing an external magnetic field allows students to explore the principles of magnetic confinement in a linear geometry.
EUROPEAN JOURNAL OF PHYSICS
(2021)
Article
Engineering, Environmental
Senne Van Alphen, Ante Hecimovic, Christian K. Kiefer, Ursel Fantz, Rony Snyders, Annemie Bogaerts
Summary: Plasma technology is a promising method for converting CO2 into value-added products. In this study, the effect of different quenching nozzles on cooling the gas and suppressing the recombination of CO back into CO2 was investigated computationally. The results showed that attaching a nozzle in the effluent of the reactor significantly improved gas quenching and reduced CO recombination reactions, especially at low flow rates.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yang Hu, Maobo Fang, Yigang Qian, Muqing Liu, Haiping Shen, Zhongyu Hou
Summary: This article proposes a new phase change fluid discharge device that increases collision frequency and decreases electrode temperature by introducing the phase change process, thus achieving high absorption performance and low operating temperature. The research results show that the device can improve the diffusivity and uniformity of the plasma, and enhance the microwave absorption effect.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Ying Xu, Rongji Zuo, Chao Yuan, Jinchuan Liu, Tao Li, Xueyong Chen, Lide Fang
Summary: In this study, a flow regime insensitivity-microwave resonant cavity sensor (FRI-MRCS) is proposed to overcome the challenges of using microwave technology for water content measurement in the complex pipe network during natural gas exploitation. By converting the pipeline into a Venturi structure and introducing a swirler, flow uniformity and regularity are achieved, mitigating the influence of gas-water distribution on water content measurement.
IEEE SENSORS JOURNAL
(2023)
Article
Instruments & Instrumentation
Ram Swaroop, Narende Kumar, Gopikishan Sabavath, Virendra Singh Choudhary, Yogesh Jewariya, G. Rodrigues
Summary: A microwave plasma diagnosis in-situ irradiation system has been developed at the Central University of Punjab, Bathinda. The final design is achieved through a combination of analytical and simulation methods using CST and Comsol Multiphysics software. Simulation results show a strong and dense electric field profile at the center of the microwave plasma chamber. The confinement of plasma without an external magnetic field confirms the presence of a strong electric field profile inside the microwave cavity. Different RF powers and gas pressures were used to record the plasma signal with Langmuir probes. Additionally, the practicality of using a plasma cavity for materials science experiments in a plasma environment was studied.
JOURNAL OF INSTRUMENTATION
(2023)
Article
Physics, Multidisciplinary
M. R. Edwards, V. R. Munirov, A. Singh, N. M. Fasano, E. Kur, N. Lemos, J. M. Mikhailova, J. S. Wurtele, P. Michel
Summary: This study demonstrates a method to create holographic plasma lenses using collinear pump lasers in a gas jet, which is crucial for manipulating high-intensity light and controlling the divergence of high-intensity pulses.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
V. Dumont, T. A. Bowen, R. Roglans, G. Dobler, M. S. Sharma, A. Karpf, S. D. Bale, A. Wickenbrock, E. Zhivun, T. Kornack, J. S. Wurtele, D. Budker
Summary: This study presents a comparative analysis of urban magnetic fields in two American cities: Berkeley, California and Brooklyn Borough of New York City. Significant differences in magnetic signatures between the two cities were identified. The study also demonstrates the use of different magnetometers for measurement and analysis to study local anthropogenic activities.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Instruments & Instrumentation
Peter Granum, Magnus Linnet Madsen, Joseph Tiarnan Kerr McKenna, Danielle Louise Hodgkinson, Joel Fajans
Summary: This paper examines different models for calculating the magnetic field of solenoids and compares their accuracy and computation time. Depending on the specific use case, different models have varying strengths and limitations. The overview provided in this paper will assist readers in making informed choices.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Physics, Fluids & Plasmas
N. Lemos, W. A. Farmer, N. Izumi, H. Chen, E. Kur, A. Pak, B. B. Pollock, J. D. Moody, J. S. Ross, D. E. Hinkel, O. S. Jones, T. Chapman, N. B. Meezan, P. A. Michel, O. L. Landen
Summary: This article reports on the experimental measurement of specular reflection (glint) of laser beams off the hohlraum wall in inertial confinement fusion experiments at the National Ignition Facility. The results show that the total measured glint on the inner cones of beams is less than 8 TW, which is less than 2% of incident peak power. Simulations indicate that the measured glinted laser light cannot account for the discrepancy between the simulated x-ray flux and the measurement. The inner beam glint is dominated by the lowest angle 21.5 beams within a 23.5 quad, and it is at most 30% sensitive to different quad polarization arrangements.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
C. Amsler, H. Breuker, S. Chesnevskaya, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, H. Higaki, E. D. Hunter, C. Killian, V. Kletzl, V. Kraxberger, N. Kuroda, A. Lanz, M. Leali, V. Maeckel, G. Maero, C. Malbrunot, V. Mascagna, Y. Matsuda, S. Migliorati, D. J. Murtagh, Y. Nagata, A. Nanda, L. Nowak, E. Pasino, M. Rome, M. C. Simon, M. Tajima, V. Toso, S. Ulmer, L. Venturelli, A. Weiser, E. Widmann, T. Wolz, Y. Yamazaki, J. Zmeskal
Summary: This article discusses the interaction between magnetized nonneutral plasma and the microwave environment. By using fine copper meshes and cryogenic microwave absorbing material, the effective temperature of the radiation environment can be lowered, resulting in reduced plasma temperature.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Nuclear
C. J. Baker, W. Bertsche, A. Capra, C. L. Cesar, M. Charlton, A. J. Christensen, R. Collister, A. Cridland Mathad, S. Eriksson, A. Evans, N. Evetts, S. Fabbri, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, P. Grandemange, P. Granum, J. S. Hangst, M. E. Hayden, D. Hodgkinson, C. A. Isaac, M. A. Johnson, J. M. Jones, S. A. Jones, A. Khramov, L. Kurchaninov, N. Madsen, D. Maxwell, J. T. K. McKenna, S. Menary, T. Momose, P. S. Mullan, J. J. Munich, K. Olchanski, J. Peszka, A. Powell, C. O. Rasmussen, R. L. Sacramento, M. Sameed, E. Sarid, D. M. Silveira, C. So, D. M. Starko, G. Stutter, T. D. Tharp, R. I. Thompson, C. Torkzaban, D. P. van der Werf, J. S. Wurtele
Summary: The ALPHA Collaboration has implemented a new beamline for low energy positron and antiproton transport. The layout and design of the beamline were optimized using a combination of semianalytical and numerical calculations. The performance of the beamline was evaluated using experimental measurements and the models used for its development were validated. Data from various sources shows a high transfer efficiency, with approximately (78 +/- 3)% of antiprotons and (71 +/- 5)% of positrons captured in the experiments.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2023)
Article
Physics, Fluids & Plasmas
E. D. Hunter, C. Amsler, H. Breuker, M. Bumbar, S. Chesnevskaya, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, H. Higaki, C. Killian, V. Kraxberger, N. Kuroda, A. Lanz, M. Leali, G. Maero, C. Malbrunot, V. Mascagna, Y. Matsuda, V. Maeckel, S. Migliorati, D. J. Murtagh, A. Nanda, L. Nowak, F. Parnefjord Gustafsson, S. Rheinfrank, M. Rome, M. C. Simon, M. Tajima, V. Toso, S. Ulmer, L. Venturelli, A. Weiser, E. Widmann, Y. Yamazaki, J. Zmeskal, ASACUSA Cusp Collaboration
Summary: In this study, we investigate methods for reducing the radius, temperature, and space charge of a non-neutral plasma under adverse conditions. Our findings show that the strong drive regime (SDR) compression and SDREVC methods are still effective even when using only 3 out of 4 rotating wall petals in a strong magnetic mirror field. We also propose an alternative method to SDREVC by using e-kick instead of evaporative cooling (EVC), and determine an upper limit for how much plasma can be cooled to T < 20 K using EVC, which depends on the space charge rather than the number of particles or plasma density.
JOURNAL OF PLASMA PHYSICS
(2023)
Article
Optics
F. Robicheaux, Deepak A. Suresh
Summary: In this study, we theoretically and computationally investigate the behavior of infinite atom arrays under nearly resonant light illumination. We analyze the coherent reflection and transmission as well as the incoherent scattering of photons from single and paired arrays using higher-order mean-field equations. The results show that the probabilities of these processes change with increasing light intensity, with the incoherent scattering initially increasing before decreasing at higher values. Additionally, we derive higher-order mean-field equations for these infinite arrays, providing a representation that can be evaluated with a finite number of equations.
Article
Physics, Fluids & Plasmas
Vadim R. Munirov, Lazar Friedland, Jonathan S. Wurtele
Summary: We propose a method for constructing multiphase excitations in nonintegrable warm fluid systems, based on autoresonant excitation of nonlinear electron plasma waves. We demonstrate the excitation of these waves through nonlinear numerical simulations and develop a simplified model that agrees with the simulation results. The autoresonantly excited multiphase waves form coherent quasicrystalline structures, which have potential applications in plasma photonic or accelerating devices.
Article
Optics
Akilesh Venkatesh, F. Robicheaux
Summary: Previous work on imaging wave-packet dynamics with x-ray scattering showed that scattering patterns deviate from the notion of instantaneous momentum density. In this study, we demonstrate that scattering patterns can provide insights into electron wave-packet dynamics by simultaneously determining the final state of the scattered electron and the scattered photon momentum. The scattering probability is proportional to the modulus square of the Fourier transform of the instantaneous electronic spatial wave function weighted by the final state of the electron. Various cases for the choice of final state are explored.
Article
Astronomy & Astrophysics
Eugene Kur, Alexander S. Glasser
Summary: A novel structure-preserving algorithm for general relativity in vacuum is derived from a lattice gauge theoretic discretization, and it is shown to preserve local Lorentz invariance and symplectic structure.
Article
Physics, Multidisciplinary
Vadim R. Munirov, Lazar Friedland, Jonathan S. Wurtele
Summary: We theoretically and numerically demonstrate that a warm fluid model of a plasma can produce space-time quasicrystalline structures. These structures are highly nonlinear, two-phase ion acoustic waves that are autoresonantly excited by two small amplitude chirped-frequency drives.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Deepak A. Suresh, F. Robicheaux
Summary: This study investigates the recoil of atoms in dense ensembles during light-matter interactions using quantized vibrational states. The study explores the recoil resulting from near-field collective dipole interactions, as well as far-field laser and decay interactions. The contributions to the recoil and its dependence on trap frequency are analyzed based on different terms of the Hamiltonian and Lindbladian. Comparisons with previous results using the impulse model in the slow-oscillation approximation are made. The calculations in highly subradiant systems demonstrate enhanced recoil, indicating the significance of recoil effects in such cases.
Article
Optics
F. Robicheaux
Summary: The paper explores conditions for Dicke superradiance in a cloud of atoms by examining the Taylor series expansion of the photon emission rate at t = 0. By defining superradiance as an increasing photon emission rate for t similar to 0, the study calculates conditions for superradiance for various cases, including emission into all angles and directional superradiance. It also investigates different types of atoms, provides equations, and offers an algorithm for efficiently evaluating these equations for large atom numbers.
