A5012758756- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Nanowire Synthesis and Applications
- Particle Detector Development and Performance
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and devices
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Semiconductor materials and interfaces
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Plasma Diagnostics and Applications
- 2D Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft and Cryogenic Technologies
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Distributed and Parallel Computing Systems
- Nuclear Physics and Applications
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- Advanced MEMS and NEMS Technologies
- Graphene research and applications
Virginia Commonwealth University
2023-2024
Brookhaven National Laboratory
1997-2020
Advanced Energy Systems (United States)
2008
National Library of Luxembourg
2007
Stony Brook University
2007
RIKEN BNL Research Center
1999-2003
Abstract Cryogenic deep reactive ion etching (Cryo DRIE) of silicon has become an enticing but challenging process utilized in front-end fabrication for the semiconductor industry. This method, compared to Bosch process, yields vertical etch profiles with smoother sidewalls not subjected scalloping, which are desired many microelectromechanical systems (MEMS) applications. Smoother enhance electrical contact by ensuring more conformal and uniform sidewall coverage, thereby increasing...
The physics interest in a luminosity upgrade of RHIC requires the development cooling-frontier facility. Detailed calculations were made electron cooling stored beams. This has been followed by beam dynamics simulations to establish feasibility creating necessary beam. accelerator will be superconducting Energy Recovery Linac (ERL). An intensive experimental R&D program engages various elements accelerator, as described 24 contributions 2007 PAC.
The function, design, construction, testing, and installation of the signal feedthroughs for barrel endcap ATLAS liquid argon calorimeters are described. provide a high density radiation hard method to extract over 200 000 signals from cryogenic environment using an application design based on flexible kapton circuit board transmission lines. A model describe frequency dependent behavior lines is also presented.
Group IV alloy nanocrystals (NCs) are a class of direct energy gap semiconductors that show high elemental abundance, low to nontoxicity, and composition-tunable absorption emission properties. These properties have distinguished Ge1–xSnx NCs as intriguing materials for near-infrared (IR) optical studies. Achieving material with efficient visible requires modified group alloys, the computational studies suggest this can be achieved Ge1–x–ySiySnx NCs. Herein, we report colloidal strategy...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Jőrg Kewisch, Ilan Ben‐Zvi, Triveni Rao, Andrew Burrill, David Pate, Erdong Wang, Rob Todd, Hans Bluem, Doug Holmes, Tom Schultheiss; The Polarized SRF Gun Experiment. AIP Conf. Proc. 4 August 2009; 1149 (1): 1133–1137. https://doi.org/10.1063/1.3215607 Download citation file: Ris (Zotero) Reference Manager...
Dodecane-capped silicon nanocrystals (NCs) were synthesized by using a low-temperature (800-1100 °C) polymer variant of traditional hydrogen silsesquioxane thermal disproportionation. Highly crystalline Si NCs having tunable diameters (3.0-6.7 nm) and thus photoluminescence (PL) peaks (1.68-1.29 eV) attained via changes in the maximum annealing temperature. Modifications NC band structure with diameter explored comparison emission absorption spectra obtained from diffuse reflectance...
We report on quantum confined Ge1-x-ySi y Sn x nanocrystals demonstrating both size- and composition-tunable direct visible/NIR emission (1.77 – 2.47 eV) recombination dynamics. Temperature-dependent time-resolved photoluminescence suggests significant enhancement of oscillator strengths with Si incorporation.
Si
Size-confined Si nanorods (NRs) have gained notable interest because of their tunable photophysical properties that make them attractive for optoelectronic, charge storage, and sensor technologies. However, established routes fabrication NRs use well-defined substrates and/or nanoscopic seeds as promoters cannot be easily removed, hindering the investigation true potential physical properties. Herein, we report a facile, one-step route via thermal disproportionation hydrogen silsesquioxane...
RF electron guns are capable of producing bunches with high brightness, which outperform DC and may even be able to provide beams for the ILC without need a damping ring. However, all successful existing polarized electrons because environment inside an gun is hostile GaAs cathode material necessary polarization. While typical vacuum pressure in better than 10−11 torr order 10−9 torr. Experiments at BINP Novosibirsk show that this leads strong ion back‐bombardment generation dark currents,...
Development of two different polarized electron guns is ongoing at BNL. One aims extremely high brightness a moderate beam current. This design uses superconducting RF gun and test setup built to show that Gallium-Arsenide cathode with negative affinity has sufficiently long quantum efficiency lifetime in such an environment. An injector using this technology may eliminate the need damping ring transport line International Linear Collider. The other project producing current emittance...
In this paper we present status and plans for the 20- MeV R&D energy recovery linac (ERL), which is under construction at Collider Accelerator Department BNL. The facility based on high current (up to 0.5 A of average current) super-conducting 2.5 RF gun,single-mode 5-cell about 20-m long return loop with very flexible lattice. ERL, planned commissioning in early 2009, aims address many outstanding questions relevant current, brightness energy-recovery linacs.
The Relativistic Heavy Ion Collider (RHIC) Project is a nuclear physics research accelerator at Brookhaven National Laboratory (BNL) with beam circulation scheduled for May 1999. To achieve the necessary lifetime, vacuum in two concentric rings must be constantly monitored to isolate problem regions. One function of RHIC instrumentation and control (I&C) system operate sector valves inputs from several hundred gauges pumps distributed around 3.8 km circumference rings. architecture...
The Relativistic Heavy Ion Collider (RHIC) has two concentric rings 3.8 km in circumference, There are three vacuum systems RHIC; the insulating vessels housing superconducting magnets, cold beam tubes surrounded by and warm tube sections at insertion regions experimental regions. requirements design of described. experience gained during commissioning these is presented with emphasis on locating helium leaks long arc system.
Photodetector based on chemical free p-type doped graphene conduction channel and core-shell CdSe/ZnS type I quantum dots absorber was studied. Chanel conductivity modulation of 20% observed under illumination. Responsivity 0.72 A/W with 19ms response time 1.4•10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8</sup> Jones specific detectivity were achieved.
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.