. The American journal of roentgenology, radium therapy and nuclear medicine . 3. GENERATING OUTFIT The operation of such a water-cooledtube at high currents and voltages wasfound to be most satisfactory on a gener-ating outfit consisting essentially of a high-tension transformer, rectifying switch andresistance control. The most suitable transformer used wasa large experimental one designed espe- 886 A Water-cooled High-voltage X-Ray Tube cially to give close regulation. The switchwas of the four-arm type and utilizedabout 70 per cent of the wave. When thetube was operating at 50 ma. and 250,
. The American journal of roentgenology, radium therapy and nuclear medicine . 3. GENERATING OUTFIT The operation of such a water-cooledtube at high currents and voltages wasfound to be most satisfactory on a gener-ating outfit consisting essentially of a high-tension transformer, rectifying switch andresistance control. The most suitable transformer used wasa large experimental one designed espe- 886 A Water-cooled High-voltage X-Ray Tube cially to give close regulation. The switchwas of the four-arm type and utilizedabout 70 per cent of the wave. When thetube was operating at 50 ma. and 250,000volts, sufficient ballast resistance was usedin the control to reduce the voltage from250 (line voltage) to about 195 (55 voltsbeing consumed in the resistance). 4. ACCESSORIES For the operation of a high-\o[tagewater-cooled tube, an insulated water. |-,c. 3. system is desirable. The experimentalinstallation employed (Fig. 4) consistedof a No. 23 Brown and Sharpe bronze gearpump (a) driven by motor (b) through aninsulating shaft (c), and a cellular typeFord radiator (d) cooled by air forcedthrough a tunnel (e) made of insulatingmaterial, from an 18 in. Davison blower(f). Water connections between pump andtube, and between tube and radiator, weremade through flexible tubing (g). The pump was driven at such a speedthat it circulated about 4 liters of waterper minute through the anode at about 30lbs. pressure. With a tube load of 50 250,000 volts, the temperature of thewater as it left the anode was 70°C. and the temperature was lowered to 50°C. in theradiator. A gear pump was chosen inpreference to a centrifugal pump becauseit assured a continuous flow of water, andfurthermore, gave the pressure necessaryto force sufficient water through the smallcopper tubing. It was necessary to pro\ide somemeans for guarding against failu
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