A5106550647- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Gyrotron and Vacuum Electronics Research
- Radiation Effects in Electronics
- High-Voltage Power Transmission Systems
- Real-time simulation and control systems
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Advanced DC-DC Converters
- Smart Grid and Power Systems
- Atomic and Molecular Physics
China General Nuclear Power Corporation (China)
2024
Brookhaven National Laboratory
2002-2010
RIKEN BNL Research Center
2002-2006
Brookhaven College
2002
Distributed electric propulsion aircraft has been highly concerned by the aviation industry for its high energy efficiency, economy and environmental protection. Based on ring architecture of distributed aircraft, transformation logic power supply system is designed in this paper, interlock optimization method control software proposed. stateflow, verification model established, scaled platform constructed. The experimental results show that can realize reliable mode, effectively solve...
The inner surface of the ring vacuum chambers US Spallation Neutron Source (SNS) will be coated with /spl sim/100 nm Titanium Nitride (TiN). This is to minimize secondary electron yield (SEY) from chamber wall, and thus avoid so-called e-p instability caused by multipacting as observed in a few high-intensity proton storage rings. Both DC sputtering DC-magnetron were conducted test relevant geometry SNS chambers. Auger Electron Spectroscopy (AES) Rutherford Back Scattering (RBS) used analyze...
A copper coil dipole magnet from the National Synchrotron Light Source (NSLS) at Brookhaven Laboratory (BNL) has been retrofitted by HTS-110 Ltd with coils made Bi-2223 wire and a self-contained cryogenic cooling system, while keeping magnet's original iron yoke. This modified bending dipole, which is first such known retrofit HTS-based accelerator magnet, provides benefits of compact design to accommodate space-limited experimental issues significant reduction in power costs as compared...
Beam induced pressure rise in RHIC warm sections is one of the machine luminosity limits. The electron cloud and beam transition are discussed. Countermeasures studies for upgrade reported.
In the SNS accumulator ring, ceramic vacuum chambers are used for 8 injection kickers to avoid shielding of a fast-changing kicker field and minimize eddy current heating. The inner surface was coated with Cu reduce beam coupling impedance provide passage image current, TiN over layer secondary electron yield. ferrite surfaces 14 extraction modules were also TiN. Customized masks produce longitudinal coating strips 1 cm x 5 ∼ mm separation among strips. methods, physical electromagnetic...
In multiphase brushless excitation systems of nuclear power plants, each phase the rotating rectifier is equipped with two parallel fuses to protect diode from overcurrent. However, a monitoring scheme assess fuse conditions currently lacking. Given that disconnection can result in one-phase open circuit rectifier, it imperative introduce system. First, considering impact on system, abnormal be equivalent an increase resistance. Then, frequency-domain characteristics exciter's stator field...
Horizontal beam orbit jitter at frequencies around 10 Hz has been observed in RHIC for several years. The distinct of this have found superconducting low-beta quadrupole triplets the ring, where they coincide with mechanical modes cold masses. Recently, we identified liquid helium flow as driving force these oscillations.
In the 1 MW Spallation Neutron Source (SNS), High-Energy Beam Transfer line (HEBT) connects LINAC to accumulator ring. A major requirement of SNS complex is have low uncontrolled beam loss (InA/m), allow hands on maintenance. The vacuum for HEBT 5/spl times/10/sup -8/ Torr. Excessive H/sup -/ stripping will occur above this pressure and increase losses in machine. also equipped with three sets halo scrapers, one momentum arid two transverse collimation. scraper located at a maximum...
The Relativistic Heavy Ion Collider (RHIC) has been operational since being commissioned in 1999. three RHIC vacuum systems have performed well and met the design requirements. A brief description of is given. experience obtained over last years summarized with emphasis on management helium leaks insulating reduction beam gas events for four major experiments.