REALISATION OF A MOLECULAR GUN OR COSMIC WIND TUNNEL
Technical Report
·
OSTI ID:4188328
The principles of a molecular gun, an apparatus by means of which it is possible to reproduce conditions to which a solid body moving at a cosmic speed in a rarefied gas is submitted, are described and discussed. The apparatus is based on the exchange momentum between two crossed beams, one of these being a molecular beam corresponding to an ordinary temperature, and the other an ion beam in which the ions are accelerated by a few to a few hundred volts. Calculations on the probabilities of collision between a high speed ion and a low speed molecule are given. A means is indicated by which only a slight dispersion of molecules may be obtained, so that the paths of the high speed molecules are not disturbed as a result of intermolecular collisions. The specifications of the ion beam are given and the manner in which the ions and the high speed molecules must be separated is discussed. Possible intensities of the high speed molecular beams, corresponding to a static pressure of 1/10 mu Hg and to a speed capable of attaining 20 to30 km/s, are discussed. (auth)
- Research Organization:
- Laboratoire Mediterraneen de Recherches Thermodynamiques, Nice
- NSA Number:
- NSA-14-008820
- OSTI ID:
- 4188328
- Report Number(s):
- AFOSR-TN-59-1292
- Country of Publication:
- United States
- Language:
- English
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