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Astrophysics, radio telescopes - download pdf or read online

By M. L. Meeks

ISBN-10: 0080859917

ISBN-13: 9780080859910

ISBN-10: 0124759521

ISBN-13: 9780124759527

-pt. B. Radio telescopes

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0 t C ˛/ 2 ˝02 2 0 ? 23) The last term in the second of Eqs. 23) is a drift perpendicular to both the direction of the field and the direction of the field gradient, rB D 2 dB= dy 1 m ? 1 Gyromotion and Drifts 27 directed along the x-axis, as shown in Fig. 3. More generally, Â Ã B rB 1 W D rB ? 25) Since rB rB D 0; B D const along the guiding center orbit in a nonuniform field. ) In the absence of an electric field, Wk and W are constant, and therefore W? D W Wk is constant. 26) B3 By analogy with Eq.

73) r. except for excursions of the order of rL The surfaces defined by Eq. 73) have a very special character – the magnetic field lines lie within them. To prove this, we must demonstrate that the normal to the surface is orthogonal to the field; that is, B r D 0. 74) The surfaces D rAÂ D const that satisfy Eq. 74) are known as flux surfaces of the magnetic field. 36 2 Motion of Charged Particles Thus, particles are constrained by conservation of angular momentum to move on flux surfaces of the magnetic field, except for excursions of the order of rL associated with the gyromotion.

10. Tokamak schematic ing in a helical magnetic field which is entirely contained within the toroidal confinement chamber. ). The tokamak concept, which was invented in the USSR in the mid-1960s, has been the most extensively investigated worldwide and is the most advanced. This concept is illustrated in Fig. 10. The toroidal field is produced by a set of toroidal field coils which encircle the plasma. The poloidal field is produced by an axial, or toroidal, current in the plasma which is induced by the transformer action of a set of primary poloidal field, or “ohmic heating,” coils.

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Astrophysics, radio telescopes by M. L. Meeks

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