Anode magnetic field strength

Fiaure 17 7 The spatial distribution of perpendicular magnetic field strength employing weak magnets (5 wk ax = 310 G) as measured with a Walker-MG 3D gauss meter. 

The distribution of magnetic field strength varies little when the cathode is made of materials such as aluminum or titanium. It varies somewhat more when the cathode is made of CRS however, the degree to which this influence is observable depends on the distance between the anode and the CRS panel. (It was more or less necessary to use CRS because the deposition of TMS on other nonmagnetic metal, such as aluminum alloy, does not yield deep blue color necessary for thickness analysis by the colorimetric principle.) 

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The spatial distributions of anode magnetic field strength are shown in Figures 17.4-17.7. For strong and weak magnetic field strengths, the maximal values are about 1550 (parallel), 1800 (perpendicular) gauss and 280 (parallel). 

Influence of Magnetic Field Strength of an Anode Magnetron... 

Figure 15.18 Influence of magnetic field strength on axial distribution of electron temperature and electron density, at center radial position, of an anode magnetron DC glow discharge of Ar 800 V, 2 seem, 50 mtorr.

Figure 17.8 The dependence of parallel magnetic field strength distribution on electrode distance at z = 0.0mm (-8//stmax = 1550 G, d is the distance between the anode surface and the cathode surface, z is the distance from the anode surface to the measurement location, cathode material is a 7 x 7 in. cold-rolled steel plate).

More recent findings hy Waskaas using iron electrodes in ferric chloride solutions tend to indicate that anode and cathode polarization curves depend on the magnetic field strength, but this effect is not purely kinetic, since it involves bulk-to-drffusion layer transfer of ferric ions. 

Figure 10.1 J. J. Thomson s method for measuring e/m, the mass-to-charge ratio of an electron (Thomson 1897). Electrons (cathode rays) leave the cathode (C) and are accelerated towards the anode (A), passing through a small hole and a further hole in plate (D) to provide a collimated beam. It then passes through crossed electric (E) and magnetic fields (B) which deflect the beam in the same plane but in opposite directions, and strikes the fluorescent screen at the end. In (a) the strengths of E and B are adjusted to bring the spot back to zero deflection (S). In (b), with electric field only, the deflection from S (y ) is measured, and e/m calculated as in the text.

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