Article
Instruments & Instrumentation
Y. Alexahin, A. Burov, V Shiltsev
Summary: Accelerated beams of high intensity in fundamental physics are limited by coherent beam instabilities, for which usual methods may be insufficient. Electron lenses have been proven to effectively provide Landau damping of transverse beam instabilities, ensuring stability without compromising incoherent stability, dynamic aperture, and beam lifetime. Proper choice of electron beam parameters and current distributions can ensure desired stability even when space charge tune shift cannot be neglected.
JOURNAL OF INSTRUMENTATION
(2021)
Correction
Physics, Multidisciplinary
A. D. Brynes, P. Smorenburg, I Akkermans, E. Allaria, L. Badano, S. Brussaard, M. Danailov, A. Demidovich, G. De Ninno, D. Gauthier, G. Gaio, S. B. van der Geer, L. Giannessi, M. J. de Loos, N. S. Mirian, G. Penco, P. Rebernik, F. Rossi, I Setija, S. Spampinati, C. Spezzani, M. Trovo, P. H. Williams, S. Di Mitri
Summary: This paper serves as an addendum to a previous reference, in which the transverse emittance growth in a bunch compressor of a free-electron laser due to CSR was studied. Analytic results based on CSR theory were compared with experimental and simulation results, showing improved agreement when the bunch compression approaches its maximum value. Recent corrections to the theoretical emittance growth have resulted in a smaller increase than previously expected.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Muni Zhou, Zhuo Liu, Nuno F. Loureiro
Summary: We conducted analytical and numerical investigations on subion-scale turbulence in low-beta plasmas using a rigorous reduced kinetic model. The results show that electron heating is primarily caused by Landau damping of kinetic Alfven waves rather than Ohmic dissipation. This collisionless damping is facilitated by the weakening of advective nonlinearities near intermittent current sheets, where free energy concentrates. The linearly damped energy of electromagnetic fluctuations explains the steepening of their energy spectrum compared to a fluid model.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Physics, Multidisciplinary
S. A. Antipov, D. Amorim, N. Biancacci, X. Buffat, E. Metral, N. Mounet, A. Oeftiger, D. Valuch
Summary: Landau damping is crucial for maintaining collective beam stability in particle accelerators, with precise knowledge of its strength being essential for accurate predictions on beam stability in high-energy colliders. An experimental procedure using active transverse feedback has been demonstrated to quantify the strength of Landau damping and the limits of beam stability, with stability diagrams for different Landau octupole strengths being measured at the Large Hadron Collider as a proof-of-principle test. This procedure could potentially provide an accurate way of measuring stability diagrams throughout the machine cycle in the future.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Hiroki Sato, T. H. Watanabe, S. Maeyama
Summary: This study applies the contour dynamics (CD) simulation method to a one-dimensional Vlasov-Poisson plasma with periodic boundary conditions, overcoming difficulties when contours cross boundaries. The results are confirmed through comparison with analytical solutions and reproduce particle trapping by Langmuir waves in the nonlinear regime.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Applied
Mohammad Akil, Zhuangyi Liu
Summary: In this paper, the stabilization of the generalized Rao-Nakra beam equation is considered. The necessary and sufficient conditions for certain cases to be strongly stable are obtained, and polynomial stability of certain orders is proved.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Physics, Fluids & Plasmas
Guanghui Zhu, Qing Li, Jiangshan Zheng, Jiacheng Ying, Rongsheng Wang, Quanming Lu, Xin Zhao, Shaodong Song, Minsheng Liu, Xuan Sun
Summary: The study by Ci et al. (2021) investigated the impact of phased antenna systems on plasma density variation with axial wavenumber. They found that density peaks were observed in all three antenna configurations in low magnetic fields, regardless of whether the Landau damping frequency was higher than the collision frequency. These adjustments may provide a novel operation mode for helicon applications.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Astronomy & Astrophysics
A. S. Afshari, G. G. Howes, C. A. Kletzing, D. P. Hartley, S. A. Boardsen
Summary: The Heliospheric plasma turbulence plays a crucial role in transferring energy from large-scale magnetic field and plasma flow fluctuations to smaller scales for dissipation. The MMS mission provides high-quality measurements of electromagnetic fields and electron velocity distributions, and reveals that electron Landau damping, asymmetric signatures, and significant electron energization rates are key factors in the dissipation of turbulent energy in the magnetosheath intervals.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Multidisciplinary Sciences
H. Rashid, U. Zakir, F. Hadi, A. Zeeshan
Summary: Using the kinetic theory approach, this theoretical investigation studies the electron acoustic waves in non-thermal plasma. The dispersion relation and Landau damping rate for Langmuir waves and electron acoustic waves are derived and it is found that these parameters are strongly influenced by non-thermal parameter, temperature ratio, and population ratio.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Polymer Science
Umer Sharif, Xinmei Xiang, Miaochang Zhu, Jun Deng, Jing Sun, Dauda Sh. Ibrahim, Orelaja Oluseyi Adewale
Summary: The current study focuses on the production and experimental examination of sandwich beams consisting of an aluminum face sheet and 3D-printed honeycomb cores filled with magnetorheological elastomer (MRE). The results suggest that the proposed sandwich beam constructions have the ability to alter the damping ratio, damping coefficient, and stiffness through the application of a magnetic field. Significant variations in damping were observed when the magnets were located in the central regions of the structures.
Article
Physics, Multidisciplinary
Chengyu Wang, A. Gupta, S. K. Singh, Y. J. Chung, L. N. Pfeiffer, K. W. West, K. W. Baldwin, R. Winkler, M. Shayegan
Summary: In this study, a new and unexpected even-denominator FQHS was observed in a high-quality GaAs 2D hole system at filling factor v = 3/4. This FQHS is observed in the lowest Landau level and exhibits non-Abelian characteristics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Susmita Sarkar, Samit Paul, Sabana Parvin
Summary: The combined effects of nonthermal and suprathermal particles on electrostatic modes of waves in an electron-ion plasma are examined. The Vasyliunas-Cairns distribution with nonthermal and suprathermal spectral indices is used to describe the plasma. The dispersion relation of Langmuir and ion-acoustic waves are studied and the populations of nonthermal and suprathermal particles are found to significantly affect the wave frequency and damping rate.
Article
Mathematics, Applied
Le Liu, Wenjing Song, Ganshan Yang
Summary: The paper discusses the inhomogeneous Landau-Lifshitz equation with nonuniform Gilbert damping term using a numerical method. A semi-discrete form of the equation is established, which is continuous in time. The temporal discretization is studied and a simple projection method is proposed to solve the problem. It is proved that the method is unconditionally stable.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Kwadwo A. Dompreh, Daniel Sekyi-Arthur, Samuel Y. Mensah, Kofi W. Adu, Raymond Edziah, Mathew Amekpewu
Summary: In this study, the Boltzmann Transport Equation (BTE) was used in the hypersound regime to investigate the generation of acoustoelectric (AE) current in an armchair graphene nanoribbon (AGNR). The AE current was deduced from the absorption of quantized sound waves (LD-QSW) energy. By analyzing the absorption and AE current with respect to frequency, wavenumber, bandgap width, and drift velocity, it was found that the absorption switched to amplification as the drift velocity varied. At high drift velocities, the amplitude of the AE current decreased as the bandgap increased, suggesting a potential use of AGNR in tunable acoustoelectric current device design.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Optics
Pascuala Garcia-Martinez, Ignacio Moreno
Summary: This study presents a new optical system for polarization image processing using geometric-phase lenses. These lenses are half-wave plates with a quadratic relationship between the orientation of the fast axis and the radial coordinate. They split an input collimated beam into a converging beam and a diverging beam with opposite circular polarizations. This coaxial polarization selectivity introduces a new degree of freedom in optical processing systems, which is useful for imaging and filtering applications that require polarization sensitivity.
Article
Instruments & Instrumentation
Vladimir Shiltsev
Summary: Ionization profile monitors (IPMs) are commonly used in accelerators for diagnosing high energy particle beams, but at high beam intensities, the measured profiles may differ due to space-charge forces. By analyzing dynamics of secondaries in IPMs and developing an algorithm, beam sizes can be effectively reconstructed. This theory has been successfully applied to Fermilab's 8 GeV proton Booster IPMs to demonstrate its efficiency.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Editorial Material
Physics, Multidisciplinary
K. R. Long, D. Lucchesi, M. A. Palmer, N. Pastrone, D. Schulte, V. Shiltsev
Review
Physics, Multidisciplinary
V Shiltsev, F. Zimmermann
Summary: This article discusses the development, achievements, and future prospects of charged particle colliders. Advances in collider technology continue to progress, promising further significant breakthroughs in the field.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Multidisciplinary Sciences
Tatyana V. Sukhacheva, Natalia V. Nizyaeva, Maria V. Samsonova, Andrey L. Cherniaev, Artem A. Burov, Mariia V. Iurova, Aleksandr I. Shchegolev, Roman A. Serov, Gennady T. Sukhikh
Summary: Telocytes in patients with atrial fibrillation and atrial fibrillation with isolated atrial amyloidosis exhibit ultrastructural signs of synthetic, proliferative, and phagocytic activity, and show various immunophenotypes. Despite no significant differences in morphology and immunophenotype of telocytes among patients with different forms of atrial fibrillation, CD68-positive cells are more commonly detected in patients with atrial fibrillation and isolated atrial amyloidosis. In aged patients with atrial fibrillation and isolated atrial amyloidosis, remodeling of atrial myocardium may lead to the transformation of telocytes into transitional forms with characteristics of fibroblast-, histiocyte-, and endotheliocyte-like cells.
SCIENTIFIC REPORTS
(2021)
Article
Instruments & Instrumentation
V Danilov, V Shiltsev
Summary: The electromagnetic interaction of colliding beams and other nonlinear fields can limit beam lifetimes and luminosities. Nonlinearities can lead to the spread of betatron frequencies and enhance dynamic diffusion of particles due to high order resonances. Compensating nonlinear forces is one possible way to address these issues, although achieving exact linearity in the system is challenging. Existing methods can eliminate footprint and resonance strength without full compensation of nonlinearities.
JOURNAL OF INSTRUMENTATION
(2021)
Article
Instruments & Instrumentation
E. Stern, Yu Alexahin, A. Burov, V Shiltsev
Summary: Further progress in fundamental particle physics requires high intensity and high brightness of accelerated proton and ion beams. One of the biggest obstacles towards this goal is the space charge of the beams, but using electron lenses to compensate for this force has been suggested as a method to reduce harmful effects.
JOURNAL OF INSTRUMENTATION
(2021)
Article
Instruments & Instrumentation
V Shiltsev
Summary: The article presents the development history and future applications of electron lenses, a novel instrument that has proven to be particularly useful for high-energy particle accelerators, especially in superconducting hadron colliders.
JOURNAL OF INSTRUMENTATION
(2021)
Article
Instruments & Instrumentation
Y. Alexahin, A. Burov, V Shiltsev
Summary: Accelerated beams of high intensity in fundamental physics are limited by coherent beam instabilities, for which usual methods may be insufficient. Electron lenses have been proven to effectively provide Landau damping of transverse beam instabilities, ensuring stability without compromising incoherent stability, dynamic aperture, and beam lifetime. Proper choice of electron beam parameters and current distributions can ensure desired stability even when space charge tune shift cannot be neglected.
JOURNAL OF INSTRUMENTATION
(2021)
Article
Physics, Nuclear
Jeff Eldred, Valeri Lebedev, Kiyomi Seiya, Vladimir Shiltsev
Summary: This passage presents the results of experimental studies on beam intensity dependent effects in the Fermilab proton Booster. The study analyzes the dependencies of beam intensity losses and validates two methods of beam emittance measurements. The ultimate performance of the machine is analyzed based on the intensity dependent emittance growth effects.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2021)
Article
Physics, Nuclear
Alexey Burov
Summary: In this study, longitudinal collective modes of a bunched beam with a repulsive inductive impedance are analytically described, finding that the discrete part of the spectrum consists of an infinite number of modes with real tunes. The loss of Landau damping and the mechanism leading to beam instability are analyzed in the presence of tiny coupled-bunch interactions.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2021)
Article
Cell Biology
Tatyana V. Sukhacheva, Roman A. Serov, Natalia V. Nizyaeva, Artem A. Burov, Stanislav V. Pavlovich, Yulia L. Podurovskaya, Maria V. Samsonova, Andrey L. Chernyaev, Aleksandr I. Shchegolev, Alexei I. Kim, Leo A. Bockeria, Gennady T. Sukhikh
Summary: Children with tetralogy of Fallot (TF) experience hemodynamic overload and hypoxemia after birth. Comparative analysis showed significant increase in ploidy and morphology of right ventricular cardiomyocytes in these children. Connexin43-containing gap junctions were predominantly distributed diffusely over the cardiomyocytes sarcolemma and redistributed into intercalated discs during cardiomyocyte differentiation. The number of Ki67-positive cardiomyocytes varied greatly and decreased with increased myocytes differentiation. Ultrastructural signs of immaturity and proliferative activity were observed in cardiomyocytes of children with TF. The proportion of interstitial tissue did not differ significantly from the control group. Myocardium in children with TF under six months of age was most sensitive to hypoxemia, resulting in delayed intercalated discs and myofibril assembly, and dystrophic changes in cardiomyocytes. The adaptation to hemodynamic overload and hypoxemia in immature myocardium of TF children involved the acceleration of ontogenetic growth and differentiation of cardiomyocytes, rather than reactivation of their proliferation.
Article
Physics, Multidisciplinary
Alexey Burov
Summary: This paper discusses recent progress in two areas of beam dynamics: the Coulomb fields of charged particle beams and wake fields, and their effects on collective beam oscillations in both transverse and longitudinal degrees of freedom.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Medicine, Research & Experimental
A. Burov, T. A. Abramov, N. S. Kostritca, D. S. Korotkov, G. Danilov, Y. Strunina, I. A. Savin
Summary: This case series demonstrates that combined blood purification therapy may have a role in treating septic shock patients with primary brain injury, leading to clinical improvement, decreased multiple organ failure severity, and lower levels of blood lactate, PCT and IL-6.
EUROPEAN JOURNAL OF MEDICAL RESEARCH
(2021)