Electron cloud buildup limits the performance of high-intensity proton accelerators like the LHC, driving beam instabilities and cryogenic heat loads. Existing methods to measure the maximum secondary electron yield (δmax) typically require dedicated instrumentation and beam-time interruptions. This work introduces a novel in situ technique that extracts δmax directly from routine electron cloud current measurements during standard LHC operation, using the transition to a linear regime with the number of injected bunches. Applied to Vacuum Pilot Sector data, it enables noninvasive, long-term monitoring of vacuum-surface conditioning.

[Phys. Rev. Accel. Beams 29, 083503] Published Mon Aug 31, 2026

Can high-temperature superconductors take accelerator dipoles past the limits of Nb-Ti and Nb₃Sn? The U.S. Magnet Development Program and industry partners tested C3, a canted-cosine-theta dipole wound with commercial REBCO CORC® wires, reaching 5.99 T in a 65 mm clear aperture at 4.2 K, with no measurable degradation after a thermal cycle. Field quality and energy loss were limited by strong conductor magnetization, yet the results reveal no fundamental showstopper on the path to 8–10 T. Alongside the magnet performance, the authors report fabrication incidents and open questions candidly and invite accelerator physicists to join as early adopters of this emerging technology.

[Phys. Rev. Accel. Beams 29, 083902] Published Fri Aug 14, 2026

High-luminosity electron–positron colliders require ampere-level beam currents, rendering coupled-bunch instabilities driven by RF-cavity accelerating modes a critical concern. For the Super Tau-Charm Facility, we demonstrate that these instabilities can be effectively suppressed over the full 1–3.5 GeV energy range using solely the baseline low-level RF (LLRF) proportional-integral (PI) loop. The combination of a unity proportional gain and half-revolution loop delay produces a notch-filter response that strongly attenuates the most dangerous odd modes. Analytical calculations, particle tracking, and Nyquist analysis collectively confirm the robustness of both beam and loop stability.

[Phys. Rev. Accel. Beams 29, 074902] Published Thu Jul 30, 2026

High-current electron storage rings require efficient collimation to protect superconducting magnets and minimize detector backgrounds. We present the first baseline collimation system design for the Electron-Ion Collider electron ring, combining optimized lattice integration with multi-turn particle tracking simulations. The proposed system localizes beam losses and reduces interaction-region losses by up to two orders of magnitude while preserving machine acceptance and beam lifetime, establishing a robust foundation for future EIC operations.

[Phys. Rev. Accel. Beams 29, 074202] Published Wed Jul 29, 2026

The electron–positron Future Circular Collider (FCC-ee) is an ambitious post-LHC project at CERN, designed to deliver collisions at four interaction points along a 91-km ring. At the experimental insertions, multiple radiation sources produce a challenging radiation environment exposing detectors and machine equipment. This work presents a comprehensive FLUKA model of the FCC-ee experimental insertions, characterizing the full radiation environment and identifying dominant sources in each region for the two extreme operational modes, at the Z pole and at the t$\overline{\mathrm{t}}$ threshold. The results crucially support the machine design, informing shielding strategies and technology choices.

[Phys. Rev. Accel. Beams 29, 061001] Published Mon Jun 08, 2026

Measuring neutron-capture cross sections on radioactive nuclei is one of the main open challenges in nuclear astrophysics, yet no existing technique can reach most of the relevant isotopes. We present the conceptual design of a free-neutron target driven by a supercompact cyclotron, optimized for integration into a low-energy ion storage ring using readily available technologies. Monte Carlo simulations show that the design enables a proof-of-concept demonstration at the CRYRING storage ring and is scalable to high neutron densities at future dedicated facilities, opening the path toward direct neutron-induced reaction measurements in inverse kinematics on stored radioactive beams.

[Phys. Rev. Accel. Beams 29, 061601] Published Wed Jun 03, 2026

X-ray free-electron lasers provide new opportunities for probing ultrafast dynamical processes in matter. Here we present a four-color XFEL scheme for multiframe diffraction imaging, in which the whole electron beam is used to generate pulses with adjustable wavelength separation and controllable time delay. By introducing optical-klystron enhancement in split undulators, the scheme improves FEL intensity while reducing the total undulator length.

[Phys. Rev. Accel. Beams 29, 050704] Published Tue May 26, 2026

Operation close to half-integer resonances can lead to significant beam quality degradation and beam loss in high-intensity/high-brightness synchrotrons. At the CERN Proton Synchrotron Booster, the controlled crossing of the $2Q_y=9$ half-integer resonance was experimentally investigated and benchmarked against six-dimensional self-consistent tracking simulations. The study demonstrates the role of incoherent space charge effects in shaping the beam profile evolution and beam losses. The observed dependence of beam losses on the resonance crossing rate, beam intensity, and resonance strength provides a basis for devising mitigation strategies.

[Phys. Rev. Accel. Beams 29, 054201] Published Tue May 12, 2026

Emittance minimization in high-brightness photoinjectors is a key challenge for x-ray free-electron lasers. We demonstrate a data- and model-guided framework combining physics-informed laser shaping with inverse emittance modeling. The approach achieves ~20% emittance reduction and enables reliable, stable shaped electron bunches for sustained high-intensity FEL operation at the European XFEL.

[Phys. Rev. Accel. Beams 29, 050701] Published Fri May 08, 2026

Heavy-ion storage rings with internal targets offer highly efficient production of rare events, but are severely limited by stochastic charge-state conversion at each target interaction, which drives rapid transverse emittance growth. We introduce a concept based on a scaling fixed-field alternating-gradient (FFA) lattice with an azimuthally modulated field index k to overcome this fundamental limitation. This approach is found to significantly suppress emittance growth, particularly in the horizontal plane. Six-dimensional beam-tracking simulations incorporating energy loss, scattering, and charge-state conversion are presented, demonstrating effectiveness under realistic conditions.

[Phys. Rev. Accel. Beams 29, 050101] Published Wed May 06, 2026

We introduce a novel beam-cooling concept for multicharge-state heavy-ion beams based on a new multi-zone stripper configuration in a charge stripper ring, where stochastic charge-state transitions combined with charge-state-dependent closed-orbit shifts turn charge exchange—normally associated with beam heating—into a mechanism for rapid cooling. Numerical simulations show substantial emittance reduction within tens of turns, allowing the scheme to overcome beam heating caused by beam-matter interactions. The concept opens new possibilities for sustaining beam-matter interactions and controlling intense heavy-ion beams in future accelerator facilities.

[Phys. Rev. Accel. Beams 29, L044001] Published Tue Apr 14, 2026

We show that purely linear acceleration of ultra-short electron bunches results in emission of a significant amount of radiation in regimes within reach of current experiments. In cases relevant to plasma acceleration, with fields of 10’s of GV/m, radiation losses are around 100µJ with losses increasing for larger acceleration field strength and shorter bunches. We also predict that acceleration with field strengths accessible to traditional RF accelerating structures results in a measurable radiation pulse of energy of 100’s of nJ. These higher-than-expected losses are due to coherence effects such that the power of the emitted radiation scales with the square of the total charge.

[Phys. Rev. Accel. Beams 29, 041003] Published Mon Apr 13, 2026

This paper presents the first experimental demonstration of a nonlinear collimator in the SuperKEKB low-energy ring. By using a pair of skew-sextupole magnets, the system enables efficient beam halo removal while keeping the collimator jaws away from the beam core, thereby reducing impedance. Beam studies show that the nonlinear collimator achieves comparable or improved background suppression relative to conventional collimators without degrading beam lifetime or injection efficiency. Furthermore, it significantly raises the instability threshold, demonstrating its potential for future high-luminosity colliders.

[Phys. Rev. Accel. Beams 29, 041002] Published Wed Apr 08, 2026

Laser-Plasma Accelerators (LPAs) have emerged as novel, compact drivers for Free-Electron Lasers (FELs), demonstrated most recently by the results of high gain (>1000) and reliability (>90%) achieved by Barber et al. The work presented here serves as a follow-up to these results, highlighting the exceptional long-term stability of the hundred-terawatt laser system. Enabled by the unique integration of multiple active stabilization systems, we demonstrate over ten hours of stable electron beam production from our LPA source, resulting in reliable, long-term operation of an LPA-driven FEL in the self-amplified spontaneous emission (SASE) regime.

[Phys. Rev. Accel. Beams 29, 041301] Published Tue Apr 07, 2026

In 2025, the 166.6 MHz high-power, high-order-modes-damped β = 1 quarter-wave superconducting cavity modules—developed for the High Energy Photon Source—successfully accelerated a 100 mA electron beam. This milestone marks the world’s first use of a superconducting quarter-wave cavity as the main accelerating system in a high-current storage ring. By extending the application limits of quarter-wave cavities from their conventional use in low-β accelerators to high-current electron storage rings, this achievement establishes a proven pathway for future high-performance light sources.

[Phys. Rev. Accel. Beams 29, 032002] Published Mon Mar 16, 2026

The accelerating structure is a key component of particle linear accelerators. The innovative S-band RF cavity (operating at 3 GHz) that we have developed and tested at high-power pushes the frontiers of high gradient RF cavities, achieving an accelerating gradient of 38 MV/m with duty factor of up to 0.035% and accelerating gradient of 24 MV/m with duty factor of 0.1%. This research contributes to the advancement of compact particle linear accelerators.

[Phys. Rev. Accel. Beams 29, 032001] Published Thu Mar 12, 2026

Fourth-generation light sources achieve unprecedented photon beam brightness by dramatically increasing the density of magnets in storage rings, pushing the limits of accelerator design. SLS 2.0, the first storage ring to incorporate a substantial number of permanent magnets in a compact multi-bend achromat lattice, was installed at the Swiss Light Source and successfully commissioned in 2025. Significant magnetic crosstalk identified during the design phase was carefully compensated through simulation-driven magnet design and measurement-based tuning strategies. The image highlights the remarkable density of magnets packed into the accelerator tunnel.

[Phys. Rev. Accel. Beams 29, 022402] Published Wed Feb 25, 2026

Fourth-generation synchrotron light sources have been an incredible success story and are currently driving groundbreaking research with photons. It turns out 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 intra-beam scattering. Further significant emittance reduction and brightness increase is only possible by increasing the beam energy in the future generation of light sources.

[Phys. Rev. Accel. Beams 29, 020704] Published Fri Feb 13, 2026

The PANDA experiment at the High Energy Storage Ring (HESR) of the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, will be a unique setup to study the strong interaction in antiproton-proton collisions. The combination of a windowless cluster-jet target and a high intensity antiproton beam, that is cooled by a stochastic cooling is ideal to study, e.g., the line shape of exotic candidates. For first studies, both were installed at the COoler SYnchrotron (COSY) at the Forschungszentrum Jülich, Germany. Detailed studies on the beam quality for different target settings were performed and will be presented.

[Phys. Rev. Accel. Beams 29, 023001] Published Thu Feb 12, 2026

Absolute proton beam polarimetry at the Electron–Ion Collider uses a polarized hydrogen jet target intersecting the hadron beam. At the EIC’s short bunch lengths and high repetition rates, beam-induced RF fields can resonantly depolarize the target atoms and compromise the required 1% polarization precision. We present a frequency-domain analysis of beam harmonics and hydrogen hyperfine transitions and show that a target guide field of about 400mT suppresses all relevant depolarizing resonances, enabling robust proton polarimetry under EIC operating conditions. The schematic illustrates the atomic hydrogen beam, proton bunches, guide field, and symmetric recoil detector geometry.

[Phys. Rev. Accel. Beams 29, 021001] Published Tue Feb 10, 2026

Auto-differentiation is applied to investigate the instability of a fully coupled three-dimensional envelope system governed by 21 ordinary differential equations. Conventionally, analyzing this complex system would require solving 441 ordinary differential equations, which is computationally intractable. However, by using auto-differentiation, only 21 equations need to be tracked. This approach allowed us to uncover an additional unreported instability stopband, which arises from space-charge-induced coupling, and highlights the significant advantages of auto-differentiation in analyzing complicated dynamical systems involving a large number of ordinary differential equations.

[Phys. Rev. Accel. Beams 29, L024201] Published Fri Feb 06, 2026

High-brightness synchrotrons are increasingly limited by collective effects, particularly transverse impedance and space charge, which lead to beam degradation and losses. The interplay of transverse impedance, space charge, and chromatic effects complicates predictions and makes realistic validation of the CERN Proton Synchrotron (PS) impedance model challenging. We present beam-based measurements performed at the PS and macroparticle tracking simulations that address these issues and quantify the impact of the key mechanisms. This work provides a robust foundation for assessing PS beam stability in present and future operational scenarios.

[Phys. Rev. Accel. Beams 29, 024201] Published Wed Feb 04, 2026

As large-scale superconducting-cavity accelerator facilities transition from the construction phase to the operational phase, the attention shifts from producing high-performance cryomodules to maintaining cryomodule performance. $In$ $situ$ plasma processing has helped to reduce field emission in superconducting linacs for protons and electrons. This paper reports the first results of plasma processing on a quarter-wave cryomodule for heavy ions at the Facility for Rare Isotope Beams.

[Phys. Rev. Accel. Beams 29, 012003] Published Thu Jan 29, 2026

Highly overmoded iris-line waveguides offer an attractive solution for the efficient transportation of THz pulses over long distances. This paper presents the general (full-scatter) field analysis for the iris-line and its discontinuities under a paraxial excitation by an arbitrary source. By developing an advanced technique that combines Lorentz’s reciprocity theorem (with a generalized guided-field configuration), uniqueness theorem, and an equivalent current-source theorem by Schelkunoff, we derive the general scattered-field coefficients analytically and examine the effects of screen thickness, transient regime, diffraction loss, and ohmic loss on the propagation properties.

[Phys. Rev. Accel. Beams 29, 012002] Published Wed Jan 28, 2026

Radio-frequency (rf) photo-guns are the most common electron sources used in LINACs for free-electron laser and Compton facilities, as they provide very low-emittance, high-brightness electron bunches. The innovative C-band system (operating at 5.712 GHz) that we have developed and tested pushes the frontiers of high-gradient rf photo-guns, combining cathode peak fields above 160 MV/m with repetition rates of up to 1 kHz. Its realization relies on a novel brazing-free technology developed at the National Institute for Nuclear Physics (INFN, Italy), enabling significant improvements in the mechanical and electrical performance of high-gradient rf devices.

[Phys. Rev. Accel. Beams 29, 012001] Published Mon Jan 12, 2026

Laser-driven ion beams possess unique features like ultra-short pulses and high particle fluxes that enable the delivery of ultra-high dose rates relevant for biomedical applications such as FLASH radiotherapy. However, their broad energy spectra and large angular divergence remain major barriers to clinical integration. Here, we demonstrate through numerical simulations the feasibility of using a high-current two-solenoid system to collect and focus laser-driven proton beams, providing a promising beam-transport concept for future proton therapy applications.

[Phys. Rev. Accel. Beams 28, 114701] Published Mon Nov 24, 2025

This study presents a comprehensive investigation of intra-bunch dynamics in a high-intensity proton synchrotron, where strong space-charge forces and large chromatic phase coexist, through theoretical analysis, simulations, and experiments at the J-PARC Main Ring. Simulations supported by analytic foundations and experimental results, reveal how space charge modifies the decoherence and recoherence of intra-bunch motion, as well as the importance of indirect space-charge effects to suppress the beam instabilities. This integrated approach deepens the understanding of beam instabilities and provides a basis for future control strategies in MW-class proton drivers.

[Phys. Rev. Accel. Beams 28, 101003] Published Fri Oct 31, 2025

We present an analytic solution for conical superconducting accelerator magnets and apply it to canted-cosine-theta magnets, which can potentially be used for the interaction region of particle colliders and medical accelerators.

[Phys. Rev. Accel. Beams 28, 102401] Published Mon Oct 27, 2025

The erosion of Radio-Frequency Quadrupole (RFQ) electrodes due to sputtering under ion irradiation is examined through coupled particle tracking and SDTrimSP (Static-Dynamic Transport of Ions in Matter Sequential-Parallel processing) simulations. Model validation was conducted using quartz crystal microbalance (QCM) measurements with proton and argon beams. The findings demonstrate that heavy-ion irradiation induces significantly higher sputtering yields and erosion rates, potentially leading to critical frequency perturbations and performance degradation in high-current RFQs. These effects are critical in accelerators with stringent operational requirements and long lifetimes and should be taken into consideration in the design of the next generation RFQ cavities.

[Phys. Rev. Accel. Beams 28, 104501] Published Mon Oct 27, 2025

Symplectic maps are essential in finding analytically tractable solutions to the three-dimensional Maxwell-Vlasov equations in the relativistic, space-charge dominated regime. However, start-to-end symplectic tracking codes are not readily available, especially for photo-injectors. In this paper, we present a symplectification algorithm that transforms mechanical into canonical coordinates, while accounting for external EM fields and self-field space charge forces. Demonstrated on the 113 MHz SRF photo-injector at BNL’s Coherent electron Cooling (CeC) experiment, this algorithm is broadly applicable and enables further analytical evaluation of microscopic instabilities.

[Phys. Rev. Accel. Beams 28, 104602] Published Tue Oct 14, 2025

Efficiently simulating laminated magnets with fast excitation cycles is a long-standing challenge. Especially when a nonlinear magnetization curve must be considered, simulation times often become prohibitive. To address this problem, we introduce the homogenized harmonic balance finite element method (HomHBFEM), which combines a frequency-dependent homogenization of the yoke laminations with a harmonic balance method and thus drastically reduces the computational cost. Thereby, the HomHBFEM has allowed us, for the first time, to conduct nonlinear simulations of the fast orbit corrector magnets for the future light source PETRA IV at DESY.

[Phys. Rev. Accel. Beams 28, 104601] Published Mon Oct 06, 2025

An upgrade of the SACLA linear accelerator is planned to achieve a kHz-level repetition rate and increased beam brightness. A key component of this upgrade is a new injector based on the existing pulsed DC gun with a thermionic cathode, featuring a novel architecture that combines multistage velocity bunching with a single stage of magnetic compression. Through genetic algorithms-based optimization, the system achieves up to three orders of magnitude in bunch compression while maintaining sub-micrometer emittance levels. The performance of the proposed injector is comparable to that of the state-of-the-art C-band injector based on an RF photocathode gun

[Phys. Rev. Accel. Beams 28, 091601] Published Thu Sep 11, 2025

There has been a continuous effort to improve the performance of light sources by pursuing higher photon brilliance and coherence. This trend has been driving the lattice design of storage rings toward a diffraction-limited emittance, which in turn results in a tighter acceptance for the injected beam. Beam injection is one of the most crucial issues for the development of future light sources based on diffraction-limited storage rings. To address the beam injection requirements of next-generation light sources, we have developed an in-vacuum thin eddy-current septum magnet.

[Phys. Rev. Accel. Beams 28, 092401] Published Wed Sep 10, 2025

After nearly a decade of operation under high-intensity proton beams, the LHC beam dumps - measuring 8.5 m in length, 720 mm in diameter, and weighing over 6 t - were dismantled and examined in an unprecedented operation at CERN. The installation of a dedicated facility with remote handling systems, along with the development of a custom cutting strategy, enabled the safe opening of the highly activated duplex stainless-steel vessel to access and inspect the carbon-based core. The results assess the viability of the absorber materials under long-term exposure to high energy densities and demonstrate how large radioactive accelerator components can be safely decommissioned.

[Phys. Rev. Accel. Beams 28, 083001] Published Mon Aug 25, 2025

A modified maximum-entropy algorithm facilitates six-dimensional phase space tomography.

[Phys. Rev. Accel. Beams 28, L084601] Published Thu Aug 07, 2025

The beam loss mitigation and its localization, especially at high intensity proton synchrotrons are extremely serious issues, which in most cases go far beyond the designed constraints causing high machine activation and personal dose to the radiation workers. This work is a breakthrough in minimizing and well localizing the beam loss based on systematic beam tests and numerical simulations at the highest beam power of 1 MW at the 3-GeV rapid cycling synchrotron of J-PARC. The beam loss power is even less than 0.1 kW, remarkably lower than the design limit of 4 kW, perfectly localized at the designated area to realize a sustainable operation with a record high of 99\% availability.

[Phys. Rev. Accel. Beams 28, 074201] Published Fri Jul 25, 2025

As a prerequisite to achieve the desired high peak current in free electron lasers, multi-stage symmetric C-chicane compressors are essentially required and widely utilized. However, during the bunch compression process, coherent synchrotron radiation (CSR) effects may lead to evident transverse emittance dilution and eventually prevent achieving a higher peak current. In this paper, we present a general model of a four-bend chicane and conduct an explicit point-kick analysis of the coherent synchrotron radiation (CSR) effects. These yield two novel steady state CSR-immune chicanes that feature non-symmetric C-shape and S-shape layouts, respectively.

[Phys. Rev. Accel. Beams 28, 070701] Published Tue Jul 22, 2025

A novel permanent magnet-based accelerator magnet is presented, featuring nested, independently rotatable Halbach rings that provide fully tunable multipole fields with no energy consumption. Its openable, modular design allows easy installation around existing beamlines and seamless conversion between dipole, quadrupole, or higher-order configurations. With precise control over field strength and orientation, including polarity reversal, this compact, maintenance-free device offers a versatile and scalable solution for modern accelerator optics.

[Phys. Rev. Accel. Beams 28, 072401] Published Mon Jul 07, 2025

A novel quasitransparent top-up injection scheme is expected to significantly improve the transparency of the injection process and reduce the recovery time for the targeted bunch, along with minimizing transverse wakefield effects and any interactions with the transverse multibunch feedback and harmonic cavity. Short stripline kickers and kicker power supplies are thus developed to provide a double pulse with a few-microsecond pulse spacing as the requirement of this scheme.

[Phys. Rev. Accel. Beams 28, 060701] Published Mon Jun 02, 2025

Very high frequency (VHF) band normal conducting guns are used as electron sources for high-repetition-rate free electron lasers, including LCLS-II in the US and SHINE in China. Substantial dark current can lead to unwanted radiation losses in these guns. It is demonstrated that by slightly over-inserting a cathode plug into the gun, the dark current can be reduced from the microampere (μA) range to the nanoampere (nA) scale, without impacting beam performance. This straightforward approach could serve as a universal strategy for dark current suppression across various types of RF guns, extending beyond VHF guns.

[Phys. Rev. Accel. Beams 28, 043401] Published Thu Apr 03, 2025

We present a novel method to minimize radiative depolarization in electron storage rings. Groups of vertical orbit bumps are constructed that achieve simultaneous polarization, orbit, and optics control, motivating the name “Best Adjustment Groups for ELectron Spin” (BAGELS). Applied in simulations of the 18 GeV Electron Storage Ring of the Electron-Ion Collider, BAGELS increases the asymptotic polarization by nearly 2x in the 1 interaction point case and over 3x in the 2-IP case. BAGELS is also used to construct knobs for global coupling correction and for generating a vertical beam size match at the IP, with minimal impacts on the polarization, orbit, and optics.

[Phys. Rev. Accel. Beams 28, 031002] Published Tue Mar 18, 2025

Local Chromatic Correction optics are proposed for the Future Circular e+ − e− Collider. These new optics assume an identical layout of the magnets at all operation. The arcs design is a step forward from the classic FODO lattice that achieves near cancellation up to the fourth order of chromatic and geometric aberrations. Straight sections and final focus benefit from the application of transparency conditions. The final focus design includes additional specific sextupoles and decapoles for the optimization of the dynamics off-energy. Decapoles are very effective to mitigate the reduction of dynamic aperture due to synchrotron radiation.

[Phys. Rev. Accel. Beams 28, 021002] Published Thu Feb 13, 2025

Filling patterns and bunch timings play a critical role in the beam breakup instability in multipass energy recovery linacs.

[Phys. Rev. Accel. Beams 28, 011003] Published Thu Jan 23, 2025

Beam stacking experiments in an FFA to reduce space charge effect.

[Phys. Rev. Accel. Beams 28, 012803] Published Thu Jan 16, 2025

A high-density gas target in the LHC opens new opportunities for physics measurements with protons and heavy ions.

[Phys. Rev. Accel. Beams 27, 111001] Published Fri Nov 08, 2024

In e+e- colliders beam-beam mode coupling instability can be stabilized with space charge.

[Phys. Rev. Accel. Beams 27, 101001] Published Fri Oct 18, 2024

A novel accelerator configuration could provide for efficient electron cooling of hadron beams, drive a dual-color Compton light source, or help measure the electric dipole moment of the electron.

[Phys. Rev. Accel. Beams 27, 090101] Published Wed Sep 18, 2024

Reconstruction of a beam six-dimensional phase space using neural networks.

[Phys. Rev. Accel. Beams 27, 094601] Published Wed Sep 11, 2024

Current-carrying wires in the Large Hadron Collider mimic long-rang beam-beam interactions to reduce the effect of real long-range beam-beam interactions.

[Phys. Rev. Accel. Beams 27, 071003] Published Tue Jul 23, 2024

Early pressure anomaly detection through machine learning improves SuperKEKB operation.

[Phys. Rev. Accel. Beams 27, 063201] Published Thu Jun 20, 2024

Working at its design limits, the Facility for Rare Isotope Beams accelerates uranium ions, with lowest charge-to-mass ratio and highest power density, and produces new isotopes.

[Phys. Rev. Accel. Beams 27, 060101] Published Mon Jun 17, 2024

Solutions to the challenges of vacuum chambers for diffraction limited storage rings are presented for the upgrade of the Swiss Light Source: From design to assembly.

[Phys. Rev. Accel. Beams 27, 053201] Published Fri May 10, 2024

A commercial linac prototype demonstrates key features for medical applications.

[Phys. Rev. Accel. Beams 27, 054701] Published Thu May 09, 2024

A transverse deflecting structure operating in two rf modes can provide time-varying linear polarization at ultrafast speed.

[Phys. Rev. Accel. Beams 27, 042001] Published Mon Apr 15, 2024

Tapered dielectric-lined waveguide allows a low energy, subrelativistic, electron beam to be accelerated to higher energy with a THz pulse.

[Phys. Rev. Accel. Beams 27, 041302] Published Thu Apr 11, 2024

A new beamline will provide access to ultrashort, low emittance electron bunches, which can be combined with high-power laser pulses.

[Phys. Rev. Accel. Beams 27, 041602] Published Wed Apr 03, 2024

A high-current, continuous-wave, multipass energy-recovery linac has been designed as a stepping stone between present state-of-art 1 MW machines and future 100 MW scale applications.

[Phys. Rev. Accel. Beams 27, 031603] Published Tue Mar 26, 2024

Microbunch rotation through an achromatic bend enables hard x-ray multiplexing and could be used to out-couple microbunches from a cavity based XFEL.

[Phys. Rev. Accel. Beams 27, 030702] Published Tue Mar 05, 2024

An analytic solution to the electromagnetic design of elliptic-bore superconducting accelerator magnets, and its application to canted-cosine-theta magnets.

[Phys. Rev. Accel. Beams 27, 022402] Published Tue Feb 27, 2024

Crystals are now used for collimation in LHC operation.

[Phys. Rev. Accel. Beams 27, 011002] Published Thu Jan 25, 2024

A positron source demonstrator with the potential to increase the yield by an order of magnitude.

[Phys. Rev. Accel. Beams 27, 013401] Published Wed Jan 17, 2024

A simple twist makes the two-frequency crab cavity scheme an ideal add-on option to produce picosecond level short pulses in fourth-generation storage rings.

[Phys. Rev. Accel. Beams 26, 120701] Published Fri Dec 15, 2023

A simulation suite that covers a range of applications from low to high energy synchrotrons, from electrons over protons to ions, and from space-charge to synchrotron-radiation dominated regimes.

[Phys. Rev. Accel. Beams 26, 114602] Published Wed Nov 29, 2023

A novel topology decreases the current density and power consumption of dc septum magnets.

[Phys. Rev. Accel. Beams 26, 092401] Published Fri Sep 29, 2023

A detailed model of an LHC experimental region predicts the energy deposition from proton-proton collisions.

[Phys. Rev. Accel. Beams 26, 061002] Published Thu Jun 15, 2023

Extraction kicker impedance reduction suppresses beam instabilities and raises beam power in the 3-GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex.

[Phys. Rev. Accel. Beams 26, 053501] Published Wed May 31, 2023

A novel beamline transports both low-energy positron and antiprotons between cylindrical Penning traps with high transfer efficiency.

[Phys. Rev. Accel. Beams 26, 040101] Published Fri Apr 21, 2023

Shedding new light on coherent frequencies and mode configuration associated with the static Robinson instability.

[Phys. Rev. Accel. Beams 26, 044401] Published Mon Apr 10, 2023

The design of a large fourth generation light source may open a new era for synchrotron radiation based x-ray science.

[Phys. Rev. Accel. Beams 26, 021601] Published Wed Feb 22, 2023

A multileaf collimator with an emittance exchange beamline allows generation of highly variable longitudinal bunch profiles.

[Phys. Rev. Accel. Beams 26, 022801] Published Wed Feb 22, 2023

A new parity space method is used to detect anomalies in the operation of large-scale superconducting accelerators.

[Phys. Rev. Accel. Beams 26, 012801] Published Wed Jan 04, 2023

The vacuum-system performance for the SuperKEKB electron and positron rings will inform the vacuum design of future high-current storage rings.

[Phys. Rev. Accel. Beams 26, 013201] Published Wed Jan 04, 2023

A new three-dimensional quasistatic particle-in-cell code for laser wakefield and plasma wakefield accelerators.

[Phys. Rev. Accel. Beams 25, 104603] Published Mon Oct 24, 2022

CERN’s “irradiation station” will investigate the effect of radiation on commercial materials, such as lubricants and gaskets, that are used regularly in accelerator beamlines and other radiation environments.

[Phys. Rev. Accel. Beams 25, 103001] Published Thu Oct 20, 2022

Commissioning of the first light-ion, low-energy superconducting linac capable of producing high beam power.

[Phys. Rev. Accel. Beams 25, 060101] Published Tue Jun 14, 2022

Combination of transverse beam splitting with a barrier bucket would make it possible to perform a quasiloss-free multiturn extraction at the CERN Proton Synchrotron.

[Phys. Rev. Accel. Beams 25, 050101] Published Fri May 20, 2022

A compact novel Paul ion trap to experimentally study the stability of intense beams in linear accelerators in a table-top environment.

[Phys. Rev. Accel. Beams 25, 054201] Published Thu May 05, 2022

High-energy protons colliding with dust particles can quench superconducting magnets.

[Phys. Rev. Accel. Beams 25, 041001] Published Fri Apr 01, 2022

A high voltage dc gun for the generation of high bunch charge polarized electrons.

[Phys. Rev. Accel. Beams 25, 033401] Published Thu Mar 24, 2022

Regenerative beam breakup instabilities in recirculating linacs can be understood through a stability analysis based on the interaction between monopole, dipole, and quadrupole modes.

[Phys. Rev. Accel. Beams 25, 024402] Published Fri Feb 04, 2022

A new technique to characterize integrated hollow THz waveguides advances the rf metrology for miniature accelerators.

[Phys. Rev. Accel. Beams 24, 122001] Published Mon Dec 06, 2021

A strong-strong model in which both the ions and the electron beams are modeled using macroparticles has been incorporated in the particle code elegant.

[Phys. Rev. Accel. Beams 24, 124401] Published Fri Dec 03, 2021

For realistic parameters, the classical radiation reaction of relativistic electrons interacting with an intense laser beam can be accurately described in closed form.

[Phys. Rev. Accel. Beams 24, 114002] Published Mon Nov 29, 2021

Successful commissioning of a hybrid multibend achromat lattice at the European Synchrotron Radiation Facility demonstrates that ultralow emittance can be achieved with excellent lifetime and large dynamic aperture for high energy storage rings.

[Phys. Rev. Accel. Beams 24, 110701] Published Mon Nov 01, 2021

A third-generation neutron-spallation lead target with movable shielding and water moderators, optimizes performance and operational reliability, and will serve as a reference for future facilities.

[Phys. Rev. Accel. Beams 24, 093001] Published Tue Sep 07, 2021

A simple and noninvasive method based on a laser emittance spoiler allows one to produce two-color x rays in free-electron lasers with high repetition rate and high flexibility.

[Phys. Rev. Accel. Beams 24, 060703] Published Mon Jun 28, 2021

The instability threshold for the current can change dramatically with the bunch filling pattern in multiturn energy recovery linacs.

[Phys. Rev. Accel. Beams 24, 061003] Published Wed Jun 23, 2021

A cryogenically cooled rf photoinjector capable of meeting the brightness demands of next-generation electron beam applications.

[Phys. Rev. Accel. Beams 24, 063401] Published Fri Jun 04, 2021

Energy recovery linac based inverse Compton scattering source may produce intense monochromatic photons above 100 keV with both high flux and high average brightness.

[Phys. Rev. Accel. Beams 24, 050701] Published Thu May 27, 2021

Neutral particles with electric or magnetic dipole moments can be trapped in beams.

[Phys. Rev. Accel. Beams 24, 054001] Published Wed May 12, 2021

Electron cooling of the heaviest singly charged molecular ions to date demonstrated in both transverse planes.

[Phys. Rev. Accel. Beams 24, 050101] Published Mon May 03, 2021

This paper presents the beam dynamics systematic corrections and their uncertainties for the Run-1 dataset of the Fermilab Muon $g-2$ Experiment. Two corrections to the measured muon precession frequency ${\omega }_a^m$ are associated with well-known effects owing to the use of electrostatic quadrupole (ESQ) vert…

[Phys. Rev. Accel. Beams 24, 044002] Published Tue Apr 27, 2021

Detecting the time difference between traversals of two thin foils, 18 m apart, allows measuring the velocity of short-lived nuclei, circulating in a storage ring over a few hundred turns, with a relative precision of 10 ppm.

[Phys. Rev. Accel. Beams 24, 042802] Published Wed Apr 14, 2021

A new way of measuring a vital property of electron beams helps prepare researchers for next-generation synchrotron light sources.

[Phys. Rev. Accel. Beams 24, 040701] Published Thu Apr 01, 2021

The first superconducting rf electron source to be operated in a free electron laser.

[Phys. Rev. Accel. Beams 24, 033401] Published Thu Mar 04, 2021

Stochastic cooling of electrons and positrons with EUV light provides petaherz-scale bandwidth for fast cooling without the amplifier.

[Phys. Rev. Accel. Beams 24, 022803] Published Thu Feb 25, 2021

A new cyclotron spiral inflector design leads to significantly more current.

[Phys. Rev. Accel. Beams 24, 023501] Published Fri Feb 05, 2021

A new look at theories of Landau damping in the longitudinal plane with practical implications.

[Phys. Rev. Accel. Beams 24, 011002] Published Wed Jan 27, 2021

Pulsed electron beams can be used to cool beams of ions and protons circulating in a hadron storage ring—a promising development for future high-energy accelerators.

[Phys. Rev. Accel. Beams 24, 012801] Published Wed Jan 06, 2021

Coaxial resonators for the systematic measurement of the rf properties of superconductors over a wide range of frequencies.

[Phys. Rev. Accel. Beams 23, 122001] Published Wed Dec 02, 2020