Toroidal Field Strength Requirements in Tokamak Reactors

1977 ◽  
Vol 32 (2) ◽  
pp. 142-154
Author(s):  
W. M. Stacey ◽  
K. Evans
Keyword(s):  
Field Strength ◽  
Toroidal Field ◽  
Tokamak Reactors

Commercial Tokamak Reactors with Resistive Toroidal Field Magnets

1984 ◽  
Vol 6 (3) ◽  
pp. 597-604 ◽  
Author(s):  
L. Bromberg ◽  
D. R. Cohn ◽  
D. L. Jassby
Keyword(s):  
Toroidal Field ◽  
Tokamak Reactors

Halo current rotation scaling in post-disruption plasmas

2021 ◽  
Author(s):  
Alex Ryan Saperstein ◽  
J P Levesque ◽  
Michael E Mauel ◽  
Gerald Navratil
Keyword(s):  
Field Strength ◽  
Scaling Law ◽  
Rotation Frequency ◽  
Toroidal Field ◽  
Tokamak Plasma ◽  
Minor Radius ◽  
Drift Frequency ◽  
Asymmetric Component

Abstract Halo current (HC) rotation during disruptions can be potentially dangerous if resonant with the structures surrounding a tokamak plasma. We propose a drift-frequency-based scaling law for the rotation frequency of the asymmetric component of the HC as a function of toroidal field strength and plasma minor radius (frot ∝ 1/BT a2 ). This scaling law is consistent with results reported for many tokamaks and is motivated by the faster HC rotation observed in the HBT-EP tokamak. Projection of the rotation frequency to ITER and SPARC parameters suggest the asymmetric HC rotation will be on the order of 10 Hz and 60 Hz, respectively.

scholarly journals Plasma Burning Control by Variable Toroidal Field Ripple in Tokamak Reactors

1980 ◽  
Vol 17 (10) ◽  
pp. 729-736 ◽  
Author(s):  
Masayoshi SUGIHARA ◽  
Masao KASAI ◽  
Teruhiko TAZIMA ◽  
Tatsuzo TONE ◽  
Koichi MAKI
Keyword(s):  
Toroidal Field ◽  
Toroidal Field Ripple ◽  
Tokamak Reactors ◽  
Plasma Burning

scholarly journals Resistive toroidal-field coils for tokamak reactors

1980 ◽  
Author(s):  
J. Kalnavarns ◽  
D.L. Jassby
Keyword(s):  
Toroidal Field ◽  
Tokamak Reactors

On the Configuration of the Magnetic Field of β CrB

1976 ◽  
Vol 32 ◽  
pp. 613-622
Author(s):  
I.A. Aslanov ◽  
Yu.S. Rustamov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Radial Velocity ◽  
Magnetic Field Strength ◽  
Complex Shape ◽  
Rotation Period ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Secular Variations ◽  
The Magnetic Field

SummaryMeasurements of the radial velocities and magnetic field strength of β CrB were carried out. It is shown that there is a variability with the rotation period different for various elements. The curve of the magnetic field variation measured from lines of 5 different elements: FeI, CrI, CrII, TiII, ScII and CaI has a complex shape specific for each element. This may be due to the presence of magnetic spots on the stellar surface. A comparison with the radial velocity curves suggests the presence of a least 4 spots of Ti and Cr coinciding with magnetic spots. A change of the magnetic field with optical depth is shown. The curve of the Heffvariation with the rotation period is given. A possibility of secular variations of the magnetic field is shown.

Improvements in the electron probe forming capabilities and x-ray hole counts in the Philips TEM

1983 ◽  
Vol 41 ◽  
pp. 376-377
Author(s):  
Richard L. McConville
Keyword(s):  
Field Strength ◽  
Electron Probe ◽  
Spherical Aberration ◽  
Focal Length ◽  
Objective Lens ◽  
Parallel Beam ◽  
Tilt Axis ◽  
X Ray ◽  
Small Probe ◽  
Specimen Height

A second generation twin lens has been developed. This symmetrical lens with a wider bore, yet superior values of chromatic and spherical aberration for a given focal length, retains both eucentric ± 60° tilt movement and 20°x ray detector take-off angle at 90° to the tilt axis. Adjust able tilt axis height, as well as specimen height, now ensures almost invariant objective lens strengths for both TEM (parallel beam conditions) and STEM or nano probe (focused small probe) modes.These modes are selected through use of an auxiliary lens situ ated above the objective. When this lens is on the specimen is illuminated with a parallel beam of electrons, and when it is off the specimen is illuminated with a focused probe of dimensions governed by the excitation of the condenser 1 lens. Thus TEM/STEM operation is controlled by a lens which is independent of the objective lens field strength.

A photoelectron microscope study of surfaces

1989 ◽  
Vol 47 ◽  
pp. 10-11
Author(s):  
W. Engel ◽  
M. Kordesch ◽  
A. M. Bradshaw ◽  
E. Zeitler
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Field Strength ◽  
Uv Light ◽  
Physical Property ◽  
Photon Flux ◽  
Mercury Lamp ◽  
Object Surface ◽  
The Sixties ◽  
Physical Features

Photoelectron microscopy is as old as electron microscopy itself. Electrons liberated from the object surface by photons are utilized to form an image that is a map of the object's emissivity. This physical property is a function of many parameters, some depending on the physical features of the objects and others on the conditions of the instrument rendering the image.The electron-optical situation is tricky, since the lateral resolution increases with the electric field strength at the object's surface. This, in turn, leads to small distances between the electrodes, restricting the photon flux that should be high for the sake of resolution.The electron-optical development came to fruition in the sixties. Figure 1a shows a typical photoelectron image of a polycrystalline tantalum sample irradiated by the UV light of a high-pressure mercury lamp.

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