A5058822851- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Photolithography Techniques
- Electromagnetic Simulation and Numerical Methods
- Distributed and Parallel Computing Systems
- Magnetic confinement fusion research
- Microwave Engineering and Waveguides
- Photocathodes and Microchannel Plates
- Advanced Data Storage Technologies
- Silicon Carbide Semiconductor Technologies
- Antenna Design and Analysis
- Electromagnetic Compatibility and Noise Suppression
- Semiconductor materials and devices
- Particle physics theoretical and experimental studies
- High-Voltage Power Transmission Systems
- Experimental Learning in Engineering
- Photonic and Optical Devices
- Cyclone Separators and Fluid Dynamics
- Electromagnetic Launch and Propulsion Technology
- Plasma Diagnostics and Applications
Brookhaven National Laboratory
2015-2024
Brookhaven College
2023-2024
Diamond Light Source
2014
RIKEN BNL Research Center
2006-2007
Institute of Engineering Physics
2000
Moscow Engineering Physics Institute
2000
A novel algorithm for self-consistent simulations of long-range wakefield effects has been developed and applied to the study both longitudinal transverse coupled-bunch instabilities at NSLS-II. The is implemented in new parallel tracking code space (self-consistent collective effects) discussed paper. applicable accurate beam dynamics cases where bunch-to-bunch intrabunch motions need be taken into account, such as chromatic head-tail on instability a with nonuniform filling pattern, or...
One of the important issues in-vacuum undulator design is coupling impedance vacuum chamber, which includes tapered transitions with variable gap size. To get complete and reliable information on impedance, analytical estimate, numerical simulations beam-based measurements have been performed at Diamond Light Source, a forthcoming upgrade introducing additional insertion device (ID) straights. The an already existing ID vessel geometrically similar to new one has measured using orbit bump...
Impedance modeling for accelerator applications has improved over the years, largely as a result of advances in simulation capabilities. While this been successful reproducing certain measurements, it is still significant challenge to predict collective effects real machines. In paper, we review our approach impedance and subsequent simulations effects. We discuss choice electrodynamics codes required computer power resources, geometric, resistive wall impedances, their comparison with...
We propose an approach to the optimization of segmented in-vacuum undulators, in which different segments along undulator may have gaps and periods. This enables close matching between vertical "envelope" electron beam motion a storage ring straight section (carefully satisfying associated "stay clear" constraint) and, at same time, precise tuning all fundamental photon energy. Placing together with periods introduce small kicks trajectories segment junctions, can be easily compensated,...
The NSLS-II BPM Button design and its development process have been described. Subjects discussed include impedance optimization, construction, production, selection a first temperature measurements at 200mA average current within 1200 bunches.
We use the program ECHO to study numerically loss factor of axisymmetric cavities and collimators with without tapering. consider a Gaussian driving bunch length $\ensuremath{\sigma}$, structures inner radius $b$, outer $d$, cavity gap (or collimator length) $g$, taper $L$. In all cases we short $\ensuremath{\sigma}\ensuremath{\ll}b$. For untapered ($L=0$), in certain regimes, describe our numerical results using known expressions for step transition diffraction model. addition, identify new...
NSLS-II is now one of the brightest synchrotron light sources worldwide, in user operations since 2014. Currently, 20 light-generating insertion devices (IDs) are installed: 3 damping wigglers and 17 undulators various types. These introduce significant distortions into magnet lattice storage ring. For each ID, have been locally corrected using quadrupole magnets located nearby ID. The also a impact on electron beam emittance. Precise measurements emittance were carried out at Coherent Hard...
Novel features of the longitudinal instability a single electron bunch circulating in low-emittance storage ring are discussed. Measurements and numerical simulations, performed both time frequency domain, show non-monotonic increase beam energy spread as function current, characterized by presence local minima maxima, where minimum is interpreted higher-order microwave threshold. It also shown that thresholds related to same zero-intensity length depend linearly on accelerating radio...
An analytical expression of the low-frequency quadrupole impedance for undulators and wigglers is derived benchmarked against beam-based measurements done at 3 GeV NSLS-II storage ring. The adopted theoretical model, valid an arbitrary number electromagnetic layers with parallel geometry, allows to calculate values magnetic permeability ${\ensuremath{\mu}}_{r}$. In comparison results variable magnet gaps, two limit cases have been studied: case perfect magnets...
In this paper we discuss computation of the coupling impedance vacuum chambers for NSLS-II storage ring using electromagnetic simulator GdfidL [1]. The depends on geometric dimensions cross-section and height slot in chamber wall. Of particular concern is complex geometry infrared extraction to be installed special large-gap dipole magnets. case, wakefields are generated due tapered transitions large vertical-aperture ports with mirrors near electron beam.
The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven Laboratory. During spring/ summer 2014, storage ring was commissioned up to 50 mA without insertion devices. In fall we began commissioning project beamlines, which included seven devices on six ID ports. Beamlines IXS, HXN, CSX-1, CSX-2, CHX, SRX, and XPD-1 consist elliptically polarized undulator (EPU), damping wigglers (DW) in-vacuum undulators (IVU) covering from VUV...