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Volume 8 (1962)
- Issue 6 Pages 647-
- Issue 5 Pages 537-
- Issue 4 Pages 433-
- Issue 3 Pages 165-
- Issue 2 Pages 97-
- Issue 1 Pages 1-
Volume 8, Issue 3
Displaying 1-5 of 5 articles from this issue
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Shuji Fukui, Satio Hayakawa, Tadao Honzawa, Hiroyuki Nishimura, Haruo ...1962 Volume 8 Issue 3 Pages 165-197
Published: 1962
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIn order to investigate the motion of electrons as single particles, we have constructed a magnetic bottle, into which electrons are injected by an electron gun, The magnetic bottle field was produced by a pair of air core coils excited by a steady current, A cylindrical vacuum chamber was inserted through the coils, so that its axis coincides with the magnetic axis, Electrons were injected at the center of the bottle and were observed at various positions.
The present paper is the first report of our experiment, by which we aim at understanding qualitative features of the motion of electrons in our device, We are here interested mainly in the effect of scattering by gases on the mirror loss, In order to avoid the shadow effect of the gun as far as possible, electrons were injected as short pulses, so that a fraction of electrons getting rid of colliding with the gun system could be distinguished from those which have collided, The shadow effect was further eliminated by varying the pressure of a gas (He or A) filled in the chamber, The trapping time of injected electrons was deduced essentially from the intensity of slow electrons produced by their collisions with gas atoms and it was found to be accounted for in terms of the single Coulomb scattering. The lifetime of the slow electrons can be qualitatively explained by their atomic scattering.View full abstractDownload PDF (27319K) -
Plasma Gun and Travelling Magnetic PistonM. Nishigaki, C. Yamanaka, Y. Yamamura1962 Volume 8 Issue 3 Pages 235-251
Published: 1962
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSWe performed the experiments on the plasma accelerators of two types. One is a rail type plasma gun and another is a travelling magnetic wave accelerator. In the former type, the plasma is accelerated by Lorentz force of the electric current and in the later type, the magnetic, piston which travels along the electric delay line acts as the drivings force. In both we measured the electric current, the velocity of plasma, some propagation characteristics, electron temperature and ion density by using a coaxial shunt, a streak camera, a Faraday cell camera, a photo-multiplier and floating double probes.
The maximum velocity of plasma was 5 × 106cm/sec for, a rod-rail type gun, 5.8 × 106cm/sec for a half-cylindrical rail type gun and 10 × 106cm/sec for the magnetic piston type. One of the important conditions for the acceleration was the distribution of the magnetic field. It was improved by varying the types of rails of the plasma gun and by changing the design of delay line on the magnetic piston type. The ion density of accelerated plasma bundle was about 108cm-3. The experiment on injection of plasma to the magnetic bottle and the ion density measurement by resonance probes are now going on.View full abstractDownload PDF (1829K) -
S. Takada, T. Tsukishima1962 Volume 8 Issue 3 Pages 252-274
Published: 1962
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESS -
Shuji Fukui, Satio Hayakawa, Tadao Honzawa, Hiroyuki Nishimura, Haruo ...1962 Volume 8 Issue 3 Pages 275-318
Published: 1962
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSA theoretical investigation of the motion of a single charged particle in an external magnetic field is given. The present description is slightly different in approach from the usual drift theory, though up to the first order the same results are obtained. Our method is based on the canonical formalism and easier to develop.to higher order approximation with some cost of intuitive aspects.
The static and axially symmetric nature of the field is assumed, and this leads to the magnetic lines of force and magnetic equi-potential lines, which, as well as rotating angle around the axis, make an orthogonal curvilinear coordinate system (ξ2). This system is suitable to describe the motion of the particle. The position and momentum 'it coordinates of the particle are transformed canonically into new variables (Qi. Pi.) (i=1, 2, 3), whose components represent gyration, longitudinal drift motion, and azimuthal drift motion, respectively.. Equations of motion for these variable, are derived in ξ3. In solving the motion the Hamilton-Jacob, formalism is applied throughout. If we confine ourselves to the region near the magnetic axis, the expansion, of quantities around the axis is useful, and the curved nature of the lines of force and the equi-potential lines is considered as perturbation. In the case of the homogeneous field (ξ4), of course, the problem is soluble completely. As the lowest (zeroth) approximation of the perturbation expansion, we consider the case of parallel but non-uniform field along the axis, in which case a separable equation is obtained. The angle and action variables (Wi (0) , Ji (0) ) are introduced. Action variables J1 (0) and J2 (0) correspond to the magnetic moment associated with the gyration and the longitudinal invariant respectively, which are adiabatic invariants, while J3 (0) the angular momentum around the axis, conserves absolutely. Following Born's prescription, we go ahead into the first order approximation (ξ5).The variations of J1 (0) and J2 (0) are calculated, where use of Born-Oppenheimer's approximation is made. As a secular motion for w3, the azimuthal drift motion appears.View full abstractDownload PDF (4083K) -
K. Matsuura, T. Honma, K. Ogawa1962 Volume 8 Issue 3 Pages 319-345
Published: 1962
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSDownload PDF (2171K)
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