A5027528369- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Superconductivity in MgB2 and Alloys
- Physics of Superconductivity and Magnetism
- Antibiotics Pharmacokinetics and Efficacy
- Iron-based superconductors research
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Energy Harvesting in Wireless Networks
- Neonatal Health and Biochemistry
- Metal and Thin Film Mechanics
- Laser-Matter Interactions and Applications
- Semiconductor materials and devices
- GaN-based semiconductor devices and materials
- Metabolism and Genetic Disorders
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Pharmaceutical studies and practices
- Radio Frequency Integrated Circuit Design
- Acoustic Wave Resonator Technologies
- Boron and Carbon Nanomaterials Research
- Bacterial Infections and Vaccines
Los Alamos National Laboratory
2013-2024
High Energy Accelerator Research Organization
2002-2022
The Graduate University for Advanced Studies, SOKENDAI
2000-2022
Memorial Hospital
2018
Niowave (United States)
2017
Los Alamos Medical Center
2016
Trex (United States)
2013
Ludwig-Maximilians-Universität München
2011
Max Planck Institute of Quantum Optics
2010
Japan Atomic Energy Agency
2009
In order to achieve a high-quality, i.e., monoenergetic, intense ion beam, we propose the use of double-layer target. The first layer, at target front, consists high-$Z$ atoms, while second (rear) layer is thin coating low-$Z$ atoms. generation high-quality proton beams from target, irradiated by an ultraintense laser pulse, demonstrated with three-dimensional particle-in-cell simulations.
An approach for accelerating ions, with the use of a cluster-gas target and an ultrashort pulse laser 150-mJ energy 40-fs duration, is presented. Ions 10--20 MeV per nucleon having small divergence (full angle) 3.4\ifmmode^\circ\else\textdegree\fi{} are generated in forward direction, corresponding to approximately tenfold increase ion energies compared previous experiments using solid targets. It inferred from particle-in-cell simulation that high ions at rear side due formation strong...
Experimental data from the Trident Laser facility is presented showing quasimonoenergetic carbon ions nm-scaled foil targets with an energy spread of as low ±15% at 35 MeV. These results and high-resolution kinetic simulations show laser acceleration ion beams by generation solitons circularly polarized pulses (500 fs, λ=1054 nm). The conversion efficiency into monoenergetic increased order magnitude compared previous experimental results, representing important step towards applications...
The synthesis of pure δ-MoN with desired superconducting properties usually requires extreme conditions, such as high temperature and pressure, which hinders its fundamental studies applications. Herein, by using a chemical solution method, epitaxial thin films have been grown on c-cut Al(2)O(3) substrates at lower than 900 °C an ambient pressure. are phase show T(c) 13.0 K sharp transition. In addition, the critical field excellent current carrying capabilities, further prove superior...
Recently. preventing environmental pollutions. lead-free (Pb-free) soldcrs are about to replace tin-lead (Sn-Pbj eutectic solders. Sn-Ag-Cu alloys arc lcading candidatcs for lead free However. were not satisfied meet sever custoiner requirements. At first, optimum silver wt%
Abstract Bulk niobium Superconducting Radio-Frequency cavities are a leading accelerator technology. Their performance is limited by the cavity loss and maximum acceleration gradient, which negatively affected vortex penetration into superconductor when peak magnetic field at wall surface exceeds ( H vp ). It has been proposed that coating inner of an SRF with superconducting thin films increases . In this work, we utilized Nb ellipsoid to simulate inverse investigate effect it magnesium...
Arguments in support of any particular superconducting coating must be framed terms its fundamental thermodynamic properties. The transition temperature, Tc, determines the surface resistance, and thus Q cavity. This remain sufficiently high that system can driven at required field gradients frequencies without leading to excessive power loss. In this regard 39 K Tc MgB2 is advantageous. With an anticipated maximum accelerating field, EaccMAX, 77 MV m−1 a BCS RsBCS (4 K, 500 MHz), 2.5 n Ω as...
Magnesium diboride (MgB 2 ) has a transition temperature (T c of 40 K, i.e., about 4 times as high that niobium (Nb).We have been evaluating MgB candidate material for radio-frequency (RF) cavities future particle accelerators.Studies in the last 3 years shown it could one order magnitude less RF surface resistance (R s than Nb at K.A power dependence test using 6 GHz TE 011 mode cavity little up to 12 mT (120 Oe), limited by available power, compared other high-T materials such YBCO.A...
We measured the thickness dependence of superconducting properties in epitaxial δ-MoN thin films grown on α-Al2O3(001) substrates by polymer-assisted deposition. Our results indicate that such as upper critical field (μ0Hc2 ≈ 10 T) and temperature (Tc = 12.5 K) are independent for thicker than ∼36 nm. By measuring current density (Jc) vortex-free state, which coincides with depairing (J0), we estimate nm have a coherence length ξ(0) 5.8 ± 0.2 penetration depth λ(0) 420 50 found it is...
Energetic ion beams are produced during the interaction of ultrahigh-intensity, short laser pulses with plasmas. These laser-produced have important applications ranging from fast ignition thermonuclear targets to proton imaging, deep lithography, medical physics, and injectors for conventional accelerators. Although basic physical mechanisms beam generation in plasma by pulse target common all these applications, each application requires a specific optimization properties, that is, an...
We report on a thorough characterisation of MgB2 bulk superconductors doped with 10 at% Ti (Tc = 36.54 K) or Zr 37.10 K). The upper critical field was determined resistively. It extrapolates to 28 T at 0 K in both cases and is, therefore, considerably larger than for pure (∼20 irreversibility lines were also resistively (offset the resistive transition). fields are much higher reach, e.g., 15 7.5 (10 Ti). current densities from ac measurements employing flux profile technique. They enhanced...
This article describes Nb thin films deposited on Cu using coaxial energetic deposition (CED). CED is a nonequilibrium cathodic arc process that drives medium energy (50-150 eV) ions into few atomic layers beneath the surface to promote growth of dense, ordered via subplantation physics. crystalline substrates by have shown bulk-Nb like (>; 300-500) RRR values. Here we describe 1-10 μm coupons and complex structures made at substrate temperatures 400 °C or less. The coated samples were...
We present an experimental approach using magnetic force microscopy for measurements of the absolute value penetration depth λ in superconductors. is obtained a simple and robust way without introducing any tip modeling procedure via direct comparison Meissner response curves material interest to those measured reference sample. Using well-characterized Nb film as reference, we determine Ba(Fe0.92Co0.08)2As2 single crystal MgB2 thin through comparative experiment. Our apparatus features...
An experimental color-TV picture display is presented on a dc gas-discharge panel which based the Burroughs' "self-scan" panel. array of 127 × 160 dots three color phosphors were formed inner surface front glass plate to reproduce pictures. A thinner center sheet soda with thickness 0.25 mm was used so that might be excited effectively by UV radiation generated from negative glow discharge. Based our vacuum-spectroscopic measurements various phosphors, Y <inf...
The mapping of outer wall temperature during the vertical test a superconducting radio-frequency (SRF) cavity has been one most useful tools to detect bad spots cavity. However, few systems except rotating-arm type have developed so far for 9- cell cavities. Since it will be an essential tool identify failure cavities, we started develop fixed- board-type system that enable us map 9-cell cavities in much shorter time than type. This paper describes design, status development and preliminary...
Niobium (Nb) superconducting radio-frequency (SRF) cavities have become the technology of choice for many recent and future particle accelerators. Increasing their accelerating gradient beyond theoretical limit Nb (~50 MV/m) by coating multilayer thin film superconductors is our ultimate goal. This idea proposed Gurevich in 2005 based on assumption that lower critical magnetic field parallel to surface (Bc1//) increases with very films having a thickness close its penetration depth. We...
We report the results of recent high power testing superconducting radio frequency photonic band gap (PBG) accelerator cells. Tests two single-cell 2.1 GHz cavities were performed at both 4 and 2 K. An accelerating gradient $15\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ an unloaded quality factor ${Q}_{0}$ $4\ifmmode\times\else\texttimes\fi{}{10}^{9}$ achieved. It has been long realized that PBG structures have great potential in reducing long-range wakefields accelerators. A structure confines...
Two /spl beta/ = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for transmutation of nuclear waste. These are promising candidates accelerating structures between a RFQ and elliptical SC proton heavy ion linacs. Since their delivery July 2002, they have been tested terms mechanical properties, low-temperature performance, i.e., Q/sub 0/-E/sub acc/ curves at 4 K 2 K, surface resistance dependence...
This study was aimed at evaluating the pharmacokinetics and pharmacodynamics of basiliximab in Japanese pediatric renal transplant patients.This carried out with approval Institutional Review Board our institution. Written consent obtained from legal representative each patient, as also patients themselves where possible. Eligible were weighing less than 35 kg younger 15 years age who scheduled to undergo transplantation. Each patient given intravenous total dose 20 mg administered two...
KEK B-Factory (KEKB) was terminated in 2010 after achieving the world record luminosity of 2.11 × 1034 cm−2s−1. This paper describes design features, performance, and operation results KEKB RF systems, which include a lot original technologies methods to store an electron/positron beam over 1 A stably. To cope with instabilities caused by large currents, two new types normal superconducting (SC) cavities stored energy were developed successfully operated. For colliding scheme called crab...
In this paper, we present the electromagnetic and structural design of a low-/spl beta/ superconducting spoke resonator for beam-test in Low Energy Demonstration Accelerator (LEDA). This test is part Advanced Applications (AAA) project. Recently, use resonators energies greater than 6.7 MeV has been approved. The beam will lowest-/spl from accelerator design. choices cavity dimensions are driven by its immediately downstream LEDA Radio-Frequency Quadrupole (RFQ). frequency 350 MHz. length...