A5078348416- Magnetic confinement fusion research
- Semiconductor materials and devices
- Superconducting Materials and Applications
- Silicon Nanostructures and Photoluminescence
- Fusion materials and technologies
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Advancements in Semiconductor Devices and Circuit Design
- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Oxidative Organic Chemistry Reactions
- Semiconductor Lasers and Optical Devices
- Quantum, superfluid, helium dynamics
- Silicon and Solar Cell Technologies
- Magnetic Properties and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Fiber Laser Technologies
- Synthesis of Organic Compounds
- Iterative Learning Control Systems
- 3D IC and TSV technologies
- Polyoxometalates: Synthesis and Applications
- Characterization and Applications of Magnetic Nanoparticles
Mitsubishi Chemical (Japan)
2023-2024
Keio University
2023
Chubu University
2018
Hitachi (Japan)
1975-2003
Advanced Science Research Center
1990
Hitachi Maxell (Japan)
1990
The suppression behaviour of magnetic island growth using electron cyclotron heating and lower hybrid current drive is analysed. A quasi-linear model developed for suppression, including the local peaking effect resistivity RF-driven within island. Pulsed launching waves synchronized with plasma diamagnetic rotation frequency can strongly suppress
A high-performance bipolar transistor technology has been developed for emitter formation using in-situ phosphorus doped polysilicon (IDP). Using this technology, a Si was designed with shallow junction, an ultra-high current gain, and cutoff frequency (f/sub T/) of 64 GHz. Furthermore, the product f/sub T/ BV ceo 200 GHz-V achieved. This value is nearly equal to physical limitation homojunction silicon transistors. The reported here believed be very promising future fabrication...
Recent lower hybrid current drive (LHCD), and heating (LHH) experiments on JT-60 are reported. The product of neRpIRF approximately 12.5*1019 m-2 MA was achieved at the LH power 4.5 MW, CD efficiency, energy confinement, global balance heat load divertor plates were investigated in high LHCD plasmas. Nearly steady state H-mode discharges found during with two different frequency injections. Sawtooth suppression NB heated plasmas by have shown an improvement confinement near plasma center....
Divertor effects on the particle confinement time in a tokamak plasma are investigated by modelling of particle, momentum and energy transports divertor transport main plasma, with simplified model for neutral-particle transport. The has three equilibrium states limited range ion flux entering divertor. It is found that existence might lead to mode conversion characteristics during additional heating.
This paper reports on the cause of hetero-emitter-like characteristics recently discovered for a phosphorus doped poly-Si emitter transistor, which is crystallized from an in-situ amorphous Si film. The band structure in investigated using (1) transistor and (2) I-V interface between layer substrate. As result, new kind potential barriers are observed conduction valence at interface. barrier proved to be origin characteristics. According interface, formation probably due discontinuity...
A high-performance bipolar transistor has been developed using an in-situ phosphorus doped polysilicon (IDP) technique for emitter formation. The demonstrated in ultrahigh current gain of 700, a maximum cutoff frequency f/sub T(max)/ 64 GHz, and breakdown voltage between collector BV/sub CEO/ 3.6 V. At V/sub CE/ values 2 3 V, product 200 GHz-V achieved. This value is nearly equal to the physical limitation homojunction silicon transistors.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A tokamak reactor concept for steady-state operation has been studied. This uses the compressional Alfvén wave to sustain plasma current. Its structure is simplified by eliminating poloidal coils in torus centre. The start-up scenario obtained minimizing and electric powers of through solving power balance Grad-Shafranov equations. operating point from viewpoint maximizing Q-value (Q = fusion power/current drive power). largest using rather than other RF waves.
Quantum computing quantum Monte Carlo (QC-QMC) is an algorithm that can be combined with algorithms such as variational eigensolver (VQE) to obtain the ground state higher accuracy than either VQE or QMC alone. Here we propose combining QC-QMC hybrid tensor network (HTN) extend applicability of for system beyond size a single device, called HTN+QMC. For HTN in two-layer quantum-quantum tree tensor, HTN+QMC $O(n^2)$-qubit trial wave function executed by using only $n$-qubit device excluding...
For part I see ibid., vol.42, no.3, pp.419-26 (1995). The purpose of this paper is to clarify the cause hetero-emitter-like characteristics reported for bipolar transistors having a poly-Si emitter which crystallized from an in-situ phosphorus-doped amorphous Si layer. It has been clarified by X-ray diffraction measurements that there large lattice deformation at interface layers with substrate. This corresponds tensile stress about 1.0 GPa. We have calculated band structure potential theory...
In this paper, we present a transistor having novel polysilicon emitter with an ultra-shallow n+ diffused layer, formed by low-temperature annealing of phosphorus doped amorphous silicon (a-Si) film. This demonstrates very higher current gain than that conventional transistors.
The calculation accuracy of TOSCA was examined using the 180 degrees sectoral H-shaped dipole magnet model with a maximum field 2.3 T and strongly saturated iron poles. measured magnetic uniformities in gap between poles agreed those calculated by within order 10/sup -3/. When central low, good agreements -4/ were obtained. fields additional yoke placed close to end also compared calculations. about 20%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The empirical scaling of the electron thermal diffusivity, χe, is investigated for more than 100 beam-heated discharges. These discharges include two major features: 1) high-temperature and high-density plasma (Te(0)≈Ti(0)≈2.5–3 keV at e≈(5–7) × 1013 cm−3, PNBI ⪅ 4 MW), which will be basis breakeven experiments in next-generation tokamaks, 2) three types discharges, i.e. good poor confinement divertor limiter – All kinds (good heating discharges) have fhe same functional form χe within ∼ 40%...