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- W52206516 abstract "The utilization of pumping-out systems in which no organic substances are used in both high vacuum pumps and in fore-pumps leads to the conclusion that the cracking of heavy hydrocarbons accumulating on the chamber walls are the basic sources of hydrocarbon intrusion into the plasma. Comparative data are given characterizing the plasma obtained in a degassed chamber with an oil-free pumping system as well as in a chamber pumped-out by means of oil-vapor pumps. These results show that in the first case it is possible to diminish considerably the carbon content in the discharge. Measurements of the radiation intensity in the vacuum region of the spectrum that were carried out show that during the first stages of the discharge, even under such conditions, a considerable quantity of the energy being fed into the plasma escapes in the form of radiation. In the subsequent discharge stages the radiation losses diminish considerably. The measurement of the intensity of the carbon lines for a discharge in pure deuterium and in a mixture of deuterium with prepared quantities of methane show that in systems with oil vapor evacuation the concentration of carbon atoms 1 to 2 mu sec after the beginning of the dischargemore » is about 20%. In order to clarify the mechanism of energy-loss from the plasma, calculations assuming a Joule- heating model were carried out with an electronic computing machine. The calculations are in agreement with the assumption that in the first stage of development of the discharge the energy is lost due to impurity radiation. A calculation is made of that velocity of intrusion of impurities into the discharge at which there is a balance between the energy fed into the discharge and the energy carried away by radiation. Other possible energy-loss mechanisms are discussed. (auth)« less" @default.
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- W52206516 date "1962-01-01" @default.
- W52206516 modified "2023-09-26" @default.
- W52206516 title "INFLUENCE OF IMPURITIES ON IONIZATION AND HEATING OF DEUTERIUM PLASMA" @default.
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