B. Beaudoin
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View article: Observation and characterization of periodic structure formation in dielectric breakdown channels of electron-irradiated polymethyl methacrylate
Observation and characterization of periodic structure formation in dielectric breakdown channels of electron-irradiated polymethyl methacrylate Open
Dielectric breakdown of insulators is a common failure mode in high-radiation environments and could be used for novel materials processing, but the mechanisms governing channel formation remain poorly understood. When electron-irradiated …
View article: Measurements of fusion yield on the Centrifugal Mirror Fusion Experiment
Measurements of fusion yield on the Centrifugal Mirror Fusion Experiment Open
The Centrifugal Mirror Fusion Experiment (CMFX) at the University of Maryland, College Park is a rotating mirror device that utilizes a central cathode to generate a radial electric field which induces a strongly sheared azimuthal E × B fl…
View article: Investigating beam dynamics with measurement-driven initialization
Investigating beam dynamics with measurement-driven initialization Open
Accurate knowledge of the phase space at beam creation is essential for understanding and predicting beam dynamics to extract or suppress phase space structures without causing avoidable emittance growth. Both first-principles models—which…
View article: From plasma to pattern: observation and characterization of periodic structure formation in dielectric breakdown channels of electron-irradiated insulators
From plasma to pattern: observation and characterization of periodic structure formation in dielectric breakdown channels of electron-irradiated insulators Open
Dielectric breakdown of insulators is one of the most common failure modes of electronics in the high-radiation environment of space, but its mechanics remain poorly understood. When electron-irradiated polymethyl methacrylate (PMMA) under…
View article: Half-life Measurements of Highly Charged Radioisotopes by Nuclear Recoil in a Penning Trap
Half-life Measurements of Highly Charged Radioisotopes by Nuclear Recoil in a Penning Trap Open
We present a novel method for measuring the half-life of highly charged radioisotopes by non-destructive nuclear recoil detection in a Penning ion trap. A specific emphasis is placed on $\rm ^7Be^{3+}$, which plays a crucial role in stella…
View article: Half-life measurements of highly charged radioisotopes by nuclear recoil in a Penning trap
Half-life measurements of highly charged radioisotopes by nuclear recoil in a Penning trap Open
We present a unique method for measuring the half-life of highly charged radioisotopes by nondestructive nuclear recoil detection in a Penning ion trap. A specific emphasis is placed on Be3+7, which plays a crucial role in stellar evolutio…
View article: Electrically insulating materials for centrifugal mirrors
Electrically insulating materials for centrifugal mirrors Open
The centrifugal mirror confinement scheme incorporates supersonic rotation into a magnetic mirror device, which stabilizes and heats the plasma. This concept is under investigation in the Centrifugal Mirror Fusion Experiment (CMFX) at the …
View article: Measurements of Fusion Yield on the Centrifugal Mirror Fusion Experiment
Measurements of Fusion Yield on the Centrifugal Mirror Fusion Experiment Open
The Centrifugal Mirror Fusion Experiment (CMFX) at the University of Maryland, College Park is a rotating mirror device that utilizes a central cathode to generate a radial electric field which induces a strongly sheared azimuthal $E\times…
View article: Characterization of electrostatic discharge currents in electron-charged polymethyl methacrylate as a proxy for natural compact intracloud discharges
Characterization of electrostatic discharge currents in electron-charged polymethyl methacrylate as a proxy for natural compact intracloud discharges Open
Electrostatic discharges occur in numerous media on a range of length scales, from microscopic discharges inside electronic materials to kilometer-long channels in air during natural lightning events. To study the mechanisms and behavior o…
View article: Design Initiative for a 10 TeV pCM Wakefield Collider
Design Initiative for a 10 TeV pCM Wakefield Collider Open
This document outlines a community-driven Design Study for a 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need for Advanced Accelerator R\&D, and the 2023 P5 Report calls for the ``delivery of an end-to-en…
View article: Imaging high jitter, very fast phenomena: A remedy for shutter lag
Imaging high jitter, very fast phenomena: A remedy for shutter lag Open
Dielectric breakdown is an example of a natural phenomenon that occurs on very short time scales, making it incredibly difficult to capture optical images of the process. Event initiation jitter is one of the primary challenges, as even a …
View article: Optimization of flat to round transformers with self-fields using adjoint techniques
Optimization of flat to round transformers with self-fields using adjoint techniques Open
A continuous system of moment equations is introduced that models the transverse dynamics of a beam of charged particles as it passes through an arbitrary lattice of quadrupoles and solenoids in the presence of self-fields. Then, figures o…
View article: Experimental Observations of Large-amplitude Solitary Waves in Electron Beams
Experimental Observations of Large-amplitude Solitary Waves in Electron Beams Open
The longitudinal dynamics of space charge dominated beams plays an important role in particle accelerators and other applications such as heavy ion fusion and free electron lasers (FELs). All beams are space-charge dominated near the sourc…
View article: Z-Shaper: A Picosecond UV Laser Pulse Shaping Channel at the Advanced Superconducting Test Accelerator
Z-Shaper: A Picosecond UV Laser Pulse Shaping Channel at the Advanced Superconducting Test Accelerator Open
Many accelerator applications require a longitudinallyshaped electron beam profile for studies ranging from THz generation to dielectric wakefield acceleration. An electron beam profile can be shaped through many techniques in both electro…
View article: Optimization of Flat to Round Transformers Using Adjoint Techniques
Optimization of Flat to Round Transformers Using Adjoint Techniques Open
A continuous system of moment equations is introduced that models the transverse dynamics of a beam of charged particles as it passes through an arbitrary lattice of quadrupoles and solenoids in the presence of self-fields. Then, figures o…
View article: Single-invariant nonlinear optics for a small electron recirculator
Single-invariant nonlinear optics for a small electron recirculator Open
This paper describes the design and simulation of a proof-of-concept\nquasi-integrable octupole lattice at the University of Maryland Electron Ring\n(UMER). This experiment tests the feasibility of nonlinear integrable optics, a\nnovel tec…
View article: Experimental Studies of Resonance Structure Dynamics With Space Charge
Experimental Studies of Resonance Structure Dynamics With Space Charge Open
Space charge is one of the fundamental limitations for next generation high intensity circular accelerators. It can lead to halo growth as well as beam loss, and affect resonance structure in ways not completely understood. We employ the U…
View article: Preliminary Lattice Studies for the Single-Invariant Optics Experiment at the University of Maryland
Preliminary Lattice Studies for the Single-Invariant Optics Experiment at the University of Maryland Open
A novel approach to transverse resonance suppression in next generation high-intensity accelerators is the use of nonlinear optical elements to induce large tune spreads which result in reduced responses to resonance driving perturbations*…
View article: Nonlinear Optics at UMER: Lessons Learned in Simulation
Nonlinear Optics at UMER: Lessons Learned in Simulation Open
Invited talk: Design of accelerator lattices with nonlinear optics to suppress transverse resonances is a novel approach and may be crucial for enabling low-loss high-intensity beam transport. Large amplitude-dependent tune spreads, driven…
View article: Adjoint Approach to Accelerator Lattice Design
Adjoint Approach to Accelerator Lattice Design Open
Accelerator lattices are designed using computer codes that solve the equations of motion for charged particles in both prescribed and self-consistent fields. These codes are run in a mode in which particles enter a lattice region, travel …
View article: Off Axis Dependence of Current Dependent Coherent Tune Shifts in the UMER Ring
Off Axis Dependence of Current Dependent Coherent Tune Shifts in the UMER Ring Open
The University of Maryland Electron Ring (UMER) was built to explore space charge effects in the extreme - beyond the space charge limit of most existing storage rings. At the nominal operating kinetic energy of 10 keV, the beam is also no…
View article: Low Space-Charge Intensity Beams in UMER via Collimation and Solenoid Focusing
Low Space-Charge Intensity Beams in UMER via Collimation and Solenoid Focusing Open
The University of Maryland Electron Ring (UMER) has operated traditionally in the regime of strong space-charge dominated beam transport, but small-current beams are desirable to significantly reduce the direct (incoherent) space-charge tu…
View article: Quadrupolar mode measurements for space charge dominated beams
Quadrupolar mode measurements for space charge dominated beams Open
On-line monitoring of beam quality requires non-invasive transverse phase space diagnostics. Emittance measurement is particularly challenging for high-intensity particle beams since space charge complicates the beam dynamics during measur…
View article: Initial Tests of Nonlinear Quasi-Integrable Optics at the University of Maryland Electron Ring
Initial Tests of Nonlinear Quasi-Integrable Optics at the University of Maryland Electron Ring Open
An octupole channel has been inserted into the University of Maryland Electron Ring (UMER), in order to investigate the mitigation of destructive resonances as a novel approach in high-intensity beam transport. The individual octupole magn…
View article: Scaled Studies on Radio Frequency Sources for Megawatt-Class Ionospheric Heaters
Scaled Studies on Radio Frequency Sources for Megawatt-Class Ionospheric Heaters Open
The ionosphere plays a prominent role in the performance of critical civilian and military communication systems. The key instrument in Ionospheric Modification (IM) research is a powerful, ground-based, High Frequency (HF) source of elect…
View article: Steering Optimizations for the University of Maryland Electron Ring
Steering Optimizations for the University of Maryland Electron Ring Open
The University of Maryland Electron Ring (UMER) has the flexibility to set up alternative lattices for different research experiments, including nonlinear optics studies using octupoles. Each alternative lattice requires an acceptable stee…
View article: High efficiency inductive output tubes with intense annular electron beams
High efficiency inductive output tubes with intense annular electron beams Open
For mobile ionospheric heaters, it is necessary to develop highly efficient RF sources capable of delivering radiation in the frequency range from 3 to 10 MHz with an average power at a megawatt level. A promising source, which is capable …
View article: Quantification of Octupole Magnets at the University of Maryland Electron Ring
Quantification of Octupole Magnets at the University of Maryland Electron Ring Open
The intensity frontier is limited by the ability to propagate substantial amounts of beam current without resulting in particle scrapping and/or losses from resonant growth and halo formation. Modern accelerators are based on the theories …
View article: Ultra-low current beams in UMER to model space-charge effects in high-energy proton and ion machines
Ultra-low current beams in UMER to model space-charge effects in high-energy proton and ion machines Open
The University of Maryland Electron Ring (UMER) has operated traditionally in the regime of strong space-charge dominated beam transport, but small-current beams are desirable to significantly reduce the direct (incoherent) space-charge tu…