Review
Chemistry, Multidisciplinary
Valery A. Dolgashev
Summary: This article reviews design methods used at SLAC National Accelerator Laboratory and other accelerator laboratories worldwide for high-gradient normal conducting accelerating structures. The paper discusses the limitations posed by vacuum radio-frequency breakdown and explores approaches to reduce the probability of breakdown. It covers both electrical design and fabrication technology of the accelerating structures to achieve practical operating gradients exceeding 100 MV/m. Extrapolation of the results to other frequencies should be done cautiously as most of the data described here were obtained during the development of 11 GHz linacs for electron-positron linear colliders.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Nuclear
Chuan Zhang, Daniel Koser, Nils Petry, Holger Podlech, Eugene Tanke
Summary: This study explores two new solutions to eliminate frequency jumps in a large-scale proton or H? accelerator, using the MYRRHA linac as an example. By utilizing a single frequency jump at fi = 0.2, the entire linac can be shortened considerably, leading to reduced construction and operation costs. The proposed frequency jump sections will use advanced radio-frequency quadrupole and drift tube linear accelerators to ensure safe and reliable operation at very high frequencies.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(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
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
Instruments & Instrumentation
B. Kaizer, L. Weissman, A. Perry, T. Zchut, I. Fishman, J. Rodnizki, M. Eizenshtat, E. Farber
Summary: This study presents the development of high power high voltage bias-T units at the Soreq Nuclear Research Center for the Soreq Applied Research Accelerator Facility linac. Two separate units were designed for different types of couplers, aiming to prevent multipacting phenomena by applying a high voltage DC bias. Successful offline and online tests were conducted.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Instruments & Instrumentation
K. Liu, X. D. Yu, P. F. Ma, Y. Lei, Q. Z. Xing, S. X. Zheng, X. L. Guan, X. W. Wang
Summary: This paper describes the physical design of a radio-frequency quadrupole (RFQ) accelerator for a compact accelerator-driven neutron source. The objective of this design is to obtain a short RFQ with a tolerable transmission and power consumption, which was achieved using a modified four-section procedure.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Instruments & Instrumentation
Emmanouil Trachanas, Andrea Bignami, Nikolaos Gazis, Angus P. C. Wylie, Kevin B. Woller, Benjamin R. Dacus, Michael P. Short, Evangelos Gazis, George Fikioris
Summary: Components of particle accelerators are exposed to high radiation environments, which can degrade material properties and affect performance and lifetime. A study demonstrates the use of Transient Grating Spectroscopy (TGS) as a powerful technique to detect post irradiation changes in thermal diffusivity of polycrystal, high-purity, oxygen-free copper.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Engineering, Aerospace
Peberlin Parulian Sitompul, Timbul Manik, Mario Batubara, Bambang Suhandi
Summary: This study conducted measurements of radio frequency interference at Mount Timau, Indonesia, showing that certain frequency ranges are relatively quiet and suitable for the development of radio telescopes in the future.
Article
Instruments & Instrumentation
Hermann W. Pommerenke, Ursula van Rienen, Alexej Grudiev
Summary: The 750 MHz PIXE-RFQ developed and built by CERN provides 2 MeV protons for proton-induced X-ray emission analysis of cultural heritage artwork over a length of one meter. The low-power rf measurements and tuning have been completed, achieving satisfying accuracy. Good agreement between rf measurement and design values was observed for single modules, quality factors, and coupling strength measurements.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Review
Physics, Atomic, Molecular & Chemical
Yuting Hu, Jiancheng Yu, Yong Wu, Keqi Tang
Summary: This paper proposes a novel pre-quadrupole RF power frame for a mass analyzer in a mass spectrometer. The design allows for wide range mass-to-charge ratio scanning and offers a higher scanning range and smaller size compared to traditional designs.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2022)
Article
Engineering, Civil
Yoshihiro Mogi, Naohiro Nakamura, Kunihiko Nabeshima, Akira Ota
Summary: This paper investigates the performance of various sparse matrix damping models in the inelastic seismic analysis of a 35-story moment-frame steel building. The necessity of frequency-insensitive damping in large-scale analysis is illustrated through numerical simulations. The vibration characteristics with simultaneous inputs of horizontal and vertical ground motion are analyzed using different damping schemes, and their results are compared. The comparisons focus on various parameters and the computation speeds are also compared, showing the limitations and challenges of these sparse matrix damping models in practical applications.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Engineering, Electrical & Electronic
Alexander Peraire-Bueno, A. John Hart
Summary: UHF RFID tags with a damped double dipole antenna design are able to sense changes in resistance regardless of reader-tag distance. Functionalized carbon nanotubes have been incorporated into these tags to create low-cost sensors that work at a fixed separation distance. Simulation and experimental results validate the effectiveness of the proposed design.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yelong Wei, Alexej Grudiev
Summary: Dielectric assist accelerating (DAA) structures demonstrate high performance in X-band, with extremely high quality factor and shunt impedance, significantly higher RF-to-beam power efficiency than conventional structures, and lower short-range transverse wakefield compared to other structures like CLIC-G.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2021)
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
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)
