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Design and Stress Analysis of Extraterrestrial ... - The Black Vault

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I<br />

,Figure 5.42c shows the des4gn <strong>of</strong> a platel heater.<br />

<strong>The</strong> construction<br />

<strong>of</strong> the tank <strong>and</strong> the servicing equipmenti for the working medium<br />

is shown in Fig. ,5.43. <strong>The</strong> diagram illustrates the servicing devIce<br />

1, the tank with the working medium 2, a porous diaphragm 3, <strong>and</strong><br />

'a porous membrane 4.<br />

Figure 5.44 prqsent Is an+ ion motor designed for the.:or1,entqtlo,-,<br />

<strong>of</strong>jearth satellites.. Cesium vapor is ionlzed on the surface <strong>of</strong><br />

N<br />

the ion lemitter 4 ,<strong>of</strong> porous ttingstedn, heated'to 1230 0 C, <strong>and</strong> extracted<br />

by accelerating electrode 6, heated to i13000,. Beam'shap'ing :is<br />

accomplished by decelerating electrode 7 solderings'8 for ion<br />

neutrallzatibn.<br />

<strong>The</strong> Cesium is<br />

fed from tank 10 under'the pr~essure <strong>of</strong> the saturated<br />

vapor, for which i't is heated to 100-1501C. Dosage is acconplished<br />

by t'he porous diaphragm 12 <strong>of</strong> ceramic, with the use <strong>of</strong> the electr•j.t'c<br />

effect <strong>of</strong> the diaphragm.<br />

On the outer wall <strong>of</strong> the diaphragm a Aiihn<br />

film <strong>of</strong> copper is depdsited. Fine control <strong>of</strong> working medium flowrate<br />

is<br />

F<br />

accomplished by changing the vol3tage <strong>of</strong> the "bopper iayer-plate."<br />

5gure 5. 45,present's the pverall view <strong>of</strong>,the motor [91], developing<br />

thrust R = 7'10-3 N; current in the ion beam is 12 mA; potential<br />

<strong>of</strong> the accelerating el

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