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Physical Review Accelerators and Beams
Scopus
ISSN 2469-9888 · American Physical Society · 2.159 artikel di indeks
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Artikel Jurnal
Lattice design and dynamics studies of a low-alpha storage ring with tens of nanometer bunch length
A novel concept is introduced to reduce the longitudinal emittance in a low momentum compaction factor (low-alpha) storage ring, enabling the stable storage of electron bunches shorter than 100 nm. This design strategy can be applied to any quasi-isochronous storage ring to achieve very high…
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Artikel Jurnal
Efficient dynamic and momentum aperture optimization for lattice design using multipoint Bayesian algorithm execution
We demonstrate that multipoint Bayesian algorithm execution (multipointBAX) can overcome fundamental computational challenges in storage ring design optimization. Dynamic aperture and momentum aperture optimization is a multipoint, multiobjective design task for storage rings, ultimately informing…
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Artikel Jurnal
Noninvasive ion fraction quantification of dual-species beams in synchrotrons
The ion composition of dual-species beams in synchrotrons is typically inferred from invasive measurements performed after beam extraction. This paper introduces a complementary noninvasive method to determine the ion composition of such beams directly inside the synchrotron. The approach is…
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Artikel Jurnal
Limitations of emittance and source size measurement of laser-accelerated electron beams using the pepper-pot mask method
The pepper-pot method is a widely used technique, originally proposed for measuring the emittance of space-charge-dominated electron beams from radio-frequency photoinjectors. With recent advances in producing high-brightness electron beams via laser-wakefield acceleration (LWFA), the method has…
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Artikel Jurnal
Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the electron-ion collider
We analyze beam-induced depolarizing effects in the hydrogen jet target (HJET) at the relativistic heavy ion collider (RHIC), which has been used for absolute hadron beam polarimetry and shall be employed at the electron-ion collider (EIC). The EIC’s higher bunch repetition frequencies and shorter…
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Artikel Jurnal
Beam intensity limitations in future multibend achromat light sources
We show that the emittance of fourth-generation 6 GeV machines such as PETRA IV is close to what is theoretically achievable due to beam intensity limitations from space charge and intrabeam scattering. By investigating these limitations, in particular their scaling with the bare lattice emittance…
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Artikel Jurnal
Beam-dust interactions in an e^{+}e^{−} collider
In recent electron-positron colliders designed and operated with very low emittance and high current, the energy density of the beam has increased significantly compared to earlier designs. Under these conditions, interactions between the beam and residual materials within the beam pipe exert…
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Artikel Jurnal
Study of fully coupled three-dimensional envelope instability using automatic differentiation
Automatic differentiation is a powerful tool for computing derivatives of simulation results with respect to given parameters. In this Letter, we have applied this tool to investigate the instability of a dynamical system governed by 21 ordinary differential equations. This second-order instability…
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Artikel Jurnal
Post long shutdown 2 CERN proton synchrotron transverse impedance model: Description and beam-based validation
In the framework of the LHC injectors upgrade project, the CERN proton synchrotron underwent hardware changes during the long shutdown 2. These changes required an update of the CERN proton synchrotron impedance model and an assessment of their impact on beam quality. In the following, the updated…
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Artikel Jurnal
Full-scatter vector field analysis of an overmoded and periodically loaded cylindrical structure for the transportation of THz radiation
Highly overmoded and periodically loaded structures, such as the iris-line waveguide, offer an attractive solution for the efficient transportation of diffraction-prone THz pulses over long distances (hundreds of meters). This paper presents the full-scatter field theory that allows us to…
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Artikel Jurnal
Near-infrared noise in intense electron bunches
This article investigates electron bunch density fluctuations in the 1-10 μm wavelength range, focusing on their impact on coherent electron cooling (CEC) in hadron storage rings. In this study, we compare the shot-noise model with experimental observations using bandwidth-filtered near-infrared…
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Artikel Jurnal
Multiphysics analysis of cryogenically cooled photocathode in a continuous wave SRF injector cavity
The paper evaluates the thermal regime of a cryogenically cooled copper photocathode integrated into a continuous-wave superconducting radio-frequency injector cavity with direct thermal contact. Such a photoinjector layout is being developed at DESY and has recently demonstrated a record-high 50…
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Artikel Jurnal
Precision alignment and tolerance of a plasma wakefield accelerator in a laser-ionized plasma source
We present a novel method to align a laser-ionized plasma source with ultrarelativistic electron beams in a plasma wakefield accelerator. The technique relies on analyzing plasma afterglow light at two longitudinal positions as the plasma column is scanned across the beam axis. Using this method…
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Artikel Jurnal
Positron transport system for muonium-to-antimuonium conversion experiment
Muonium-to-antimuonium conversion experiment (MACE) aims to detect the charged lepton flavor violation (cLFV) process. A key component of MACE is the positron transport system (PTS) to collect and transport atomic positrons from antimuonium decays, which consists of an electrostatic accelerator and…
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Artikel Jurnal
Wide frequency-range acceleration using second-harmonic rf buckets in fixed-field accelerators
We propose a novel acceleration scheme for fixed-field accelerators (FFAs), in which rf buckets with harmonic numbers h=1 and h=2 are time-sequenced to form a single, continuous acceleration path. This approach completes acceleration in two rf frequency sweeps, thereby reducing the total frequency…
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Artikel Jurnal
Sextupole reduction via chaos suppression at the National Synchrotron Light Source II
We revisit the nonlinear lattice design approach for the National Synchrotron Light Source II (NSLS-II) storage ring. By suppressing chaos, we identify alternative sextupole configurations to the original design, which relied on the conventional strategy of simultaneously minimizing resonance…
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Artikel Jurnal
Improved high-gradient performance for medium-velocity superconducting half-wave resonators: Surface preparation and trapped flux mitigation
A development effort to improve the performance of superconducting radio-frequency half-wave resonators (SRF HWRs) is underway at the Facility for Rare Isotope Beams (FRIB), where 220 such resonators are in operation. Our goal was to achieve an intrinsic quality factor (Q_{0}) of ≥2×10^{10} at an…
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Artikel Jurnal
Resonant island trapping in a hybrid multibend achromat synchrotron light source
We report the first direct experimental observations of resonance island formation in a hybrid multibend achromat (HMBA) storage ring lattice. Using a low-emittance electron beam, we achieved high-precision measurements that resolve the onset, evolution, and transient dynamics of particle capture…
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Artikel Jurnal
Knock out slow extraction using betatron sidebands at high harmonics
Radio frequency knock out resonant slow extraction is a standard method for extracting stored particle beams from synchrotrons by transverse excitation. Excitation signals comprising many betatron sidebands have been shown to reduce intensity fluctuations of the extracted beam spill and are used at…
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Artikel Jurnal
Short-pulse high-power THz generation using optical klystron FELs: Simulation results
The generation of high-power radiation in the terahertz (THz) regime using free-electron lasers (FELs) is challenging due to strong diffraction and pronounced slippage effects. These constraints often limit the achievable pulse duration and peak power in conventional single-pass THz FEL…
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