Eight poles

Separations similar to those obtained with dry induced-roll devices can be obtained with cross-belt separators (Fig. 19-42). These units are built with up to eight poles, each of which can operate at different magnetic-field intensities to allow simultaneous production of different concentrates. However, capacity is low, and installed costs per ton capacity are high compared with induced-roll units. 

Induction motors are the most frequent in use because of their simple and rugged construction, and simple installation and control. They are constant speed devices available as 3600 (two-pole), 1800, 1200, and 900 rpm (eight-pole). Two speed models with special windings with 2 1 speed ratios are sometimes used with agitators, centrifugal pumps and compressors and fans for air coolers and cooling towers. Capacities up to 20,000 HP are made. With speed... 

VII-I 1.8 T eight-pole wiggler 10.8 keV at 3 GeV 1.0 58 cm long platinum coated fused silica bent for vertical focussing Bent triangle Ge (111) or Si (111)... 

An oscillation camera film data collection facility has been established at Stanford. This station (beam line VI1-1) uses 1 mrad of beam from an eight-pole multipole wiggler (Winick and Spencer 1980). The optics consists of a bent Ge(lll) triangular monochromator followed by a bent metal coated mirror. The small number of available mrad of beam is easily compensated by the number of poles in the wiggler. The station has been used extensively. Examples of structures reported using data collected on this station are given in chapter 10. 

In a mnlti-pole motor for eight-pole operation, the adjacent poles change in polarity from North to South around the air gap. 

In a multipole, all poles are interconnected, but not necessarily with all other poles. Some poles are connected to the outside, playing the role of ports (or gates, but this word is reserved to variables and nodes in a Formal Graph). A first characteristic of a multipole is quantified by the number of poles and ports. These nnmbers are necessarily higher than one, and even two for the number of poles, if one considers that two poles make a dipole, which belongs to a lower level of Formal Objects. Figure 8.2 shows a five-port multipole made of eight poles. 

In addition to permanent dipoles, species can exhibit higher-order terms in the multipolar expansion, such as quadrapoles (four poles), octapoles (eight poles), or higher-order multipoles. However, these higher-order terms do not measurably influence macroscopic property behavior. 

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