peaked density distribution (n~l/r). Thus, most collisions take place near r=0 and do not change the canonical angular momentum, nor do they significantly disrupt the orbits. In four operating models of the self-collider or migma-cell built between 1973 and 1982, the product of density and containment time was increased by 8 orders of magnitude (Fig. 1). Migma is a mixture of large gyroradius ions in an axisymmetric magnetic field. The ion orbits precess through the field's axis and therefore have zero canonical angular momentum. The magnetic field intensity decreases with radius, r, and increases with the distance from the mid-plane as shown in Fig. 2, where the field index is The migma is formed by collisional dissociation of molecular ions (e.g. Dt) that traps atomic ions in the migma orbits. In the most recent experiments [4], the migma formed a 20 cm diameter disc, ~1 cm thick (V = 300 cm3). The space charge due to the ions was neutralized by commingling electrons coherently oscillating along the axis. The oscillation frequency was controlled by applying voltage to end plates located a few migma thicknesses to either side of the mid-plane and in this way the electrons were maintained off-resonance with the axial ion betatron oscillations. The resultant system is a hybrid between colliding beams and plasma. By these means 700 keV deuteron migmas with average density n of ~3xlO9cm'3 and peak density ~3 X 10l0cm-3, factors of 10 and 100, respectively, above the space charge limit of 4X 108cm-3 were produced. The energy confinement time was ~20 s and the luminosity or reaction rate per unit cross section, defined as was 1030cm-2s_1. In Eq. 5, nt and n2 and m, and u2 are the number densities and velocities of ion species 1 and 2. For a single species system, nI=n2 = «/2 and n1n2 = w2/4. As the ion density increases, the diamagnetic migma self-field reduces the net magnetic field and reverses the radial field gradient. At an ion density where the
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