A5038163919- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Radiation Effects in Electronics
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Atomic and Subatomic Physics Research
- Advanced Data Storage Technologies
- Laser-Plasma Interactions and Diagnostics
- Semiconductor materials and devices
- Graphite, nuclear technology, radiation studies
- Atomic and Molecular Physics
- Advanced X-ray Imaging Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Optical Sensing Technologies
- Muon and positron interactions and applications
- Electrohydrodynamics and Fluid Dynamics
- Advanced Radiotherapy Techniques
- Rocket and propulsion systems research
- Silicon Carbide Semiconductor Technologies
- Radiation Therapy and Dosimetry
- Optical Systems and Laser Technology
Argonne National Laboratory
2015-2022
Cornell University
2012-2016
The Advanced Photon Source (APS) team is building a fourth-generation storage ring (4GSR), replacing the present double-bend achromat lattice with multibend system thereby allowing production of ultrabright x-ray beams. new enables 2-order-of-magnitude reduction in horizontal beam emittance and factor two increase current. result an electron very high energy power densities. Initial predictions suggest many common ultrahigh-vacuum-compatible materials struck by full-intensity will be...
As part of the CESR-TA program at Cornell, diagnostic devices to measure and quantify electron cloud effect have been installed throughout CESR ring. One such device is Retarding Field Analyzer (RFA), which provides information on local density energy distribution. In a magnetic field free environment, RFA measurements can be directly compared with simulation study growth dynamics quantitative level. particular, photoemission secondary emission characteristics instrumented chambers...
Cornell's electron/positron storage ring (CESR) was modified over a series of accelerator shutdowns beginning in May 2008, which substantially improves its capability for research and development particle accelerators. CESR's energy span from 1.8 to 5.6 GeV with both electrons positrons makes it ideal the study wide spectrum physics issues instrumentation related present light sources future lepton damping rings. Additionally number these are also relevant beam proton This paper is third...
Ions are produced in an accelerator when the beam ionizes residual gas inside vacuum chamber. If is negatively charged, ions can become trapped beams potential, and their density will increase over time. Trapped cause a variety of undesirable effects, including instability emittance growth. This paper discuss possibility ion trapping APS-Upgrade storage ring. The question where be addressed using simple analytical calculations, while modeled with computer simulations. A scheme proposed for...
The buildup of low energy electrons in an accelerator, known as electron cloud, can be severely detrimental to machine performance. Under certain beam conditions, the become resonant with cloud dynamics, accelerating electrons. This paper will examine two such effects: multipacting resonances, which development time is bunch spacing, and cyclotron period a magnetic field multiple spacing. Both resonances have been studied directly dipole fields using retarding analyzers installed Cornell...
A design choice for the Advanced Photon Source Upgrade to inject into storage ring using bunch swap out rather than off-axis accumulation means that injectors are required accelerate much higher electron charge originally designed. In present work, we outline upgrades current monitor and beam position diagnostics Particle Accumulator Ring accommodate charges of 1-20 nC. Through experiments, compare characterize system responses over range charge.