A5066002265- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Electron and X-Ray Spectroscopy Techniques
- Pulsed Power Technology Applications
- Laser Design and Applications
- Gyrotron and Vacuum Electronics Research
- Electrostatic Discharge in Electronics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Radio Frequency Integrated Circuit Design
- Radiation Effects in Electronics
- Advanced DC-DC Converters
- Sensor Technology and Measurement Systems
- Induction Heating and Inverter Technology
- Plasma Diagnostics and Applications
- Low-power high-performance VLSI design
- Metamaterials and Metasurfaces Applications
- Advancements in Photolithography Techniques
- High-Energy Particle Collisions Research
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Antenna Design and Analysis
Brookhaven National Laboratory
2006-2020
Brookhaven College
2014
RIKEN BNL Research Center
2007
A hollow electron beam has been proposed as an active control tool to remove the halo from high-energy, high-current hadron or ion machines (such High-Luminosity Large Hadron Collider). To study removal rate and assess effect on core, one of two lenses in Relativistic Heavy Ion Collider was changed a Gaussian profile profile. We describe design verification parameters well methods minimize distortions, which can result emittance increase. The alignment with by using backscattered detector...
Two electron lenses ($e$-lenses) have been in operation during the 2015 RHIC physics run as part of a head-on beam-beam compensation scheme. While lattice was chosen to reduce beam-beam-induced resonance-driving terms, reduced tune spread. This has demonstrated for first time. The scheme allows higher parameters and therefore intensities luminosity. In this paper, we detail design considerations verification beam $e$-lenses. Longitudinal transverse alignments with ion beams transfer function...
In this paper, we propose a simplified model for easy estimation of design parameters and quick analysis fast pulsed inductive adder modulators. Analytical method is used to deduct the circuit model. This offers an way understand behavior inductive-adder modulator circuits provides designers helpful tool estimate critical such as pulse rise time, system impedance, number stages, etc. Computer simulations demonstrate that parameter based on fairly accurate compared original circuit. Further...
The head-on beam-beam interaction is the dominant luminosity limiting effect in polarized proton operation RHIC. To mitigate this an electron lens was installed each of two RHIC rings. We summarize hardware and beam commissioning results to date, report on first experience with electron-hadron interaction. In 2014 has operated gold beams only. case not limited by interactions compensation necessary. goals years efforts are a test all instrumentation; demonstration overlap; parameters that...
In the Relativistic Heavy Ion Collider (RHIC) 100 GeV polarized proton run in 2015, two electron lenses were used to partially compensate for head-on beam-beam effect first time. Here, we describe design of current lens, detailing hardware modifications made after 2014 commissioning with heavy ions. A new gun 15-mm diameter cathode is characterized. The beam transverse profile was measured using a YAG screen and fitted Gaussian distribution. During operation, overlap beams achieved...
In this paper, we propose a simplified model for easy estimation of design parameters and quick analysis inductive adder modulators. Analytical method is used to deduct the circuit model. This offers an way understand behavior inductive-adder modulator circuits provides designers helpful tool estimate critical such as pulse rise time, system impedance, number stages, etc. Computer simulations demonstrate that parameter based on fairly accurate compared original circuit. Furthermore, approach...
In polarized proton operation, the performance of Relativistic Heavy Ion Collider (RHIC) is limited by head-on beam-beam effect. To overcome this limitation, two electron lenses are under commissioning. We give an overview compensation in general and specific design for RHIC, which based on lenses. The status installation commissioning presented along with plans future.
This power supply was designed and developed at Brookhaven National Laboratory (BNL) as part of a new ion pre injector system called EBIS (Electron Beam Ion Source). It consists charging supply, capacitor bank, discharge recovery circuit control circuits. The output is fed through cables into solenoid magnet. magnet's inductance 1.9mH. maximum voltage 1000V. half sine wave 13ms duration. repetition rate 5Hz. can be set to any value between 250A 1900A in one second order accommodate the...
Inductive voltage adder topology has attracted great attentions in pulse power community for near two decades. However, there been lack of literatures on inductive network analysis and circuit design model. We have recently developed a simplified model set simple formulas. An expanded more detailed are presented this paper. Our reveals the relationship output waveform parameters hardware designs. Computer simulations demonstrated that parameter estimation based approach is accurate. This can...
In order to increase the polarized proton luminosities, a new E-LENS system will be installed in RHIC tunnel. One of key parts this project is achieve fast rise time for elens electron gun. The gun driven by high voltage and pulse repetition rate anode modulator. This paper discuss some details modulator design concept its simulation, problems during test, scheme modification prototype test results. Meanwhile, diagrams, pictures measured waveforms shown paper. has reached specification...