Accession Number:

AD0837044

Title:

VELOCITY ANALYSIS OF LAVAL BEAMS (GESCHWINDIGKEITSANALYSE VON LAVAL-STRAHLEN),

Descriptive Note:

Corporate Author:

AMERICAN METEOROLOGICAL SOCIETY BOSTON MA

Personal Author(s):

• Becker, E. W.
• Henkes, W.

Report Date:

1964-07-01

Pagination or Media Count:

19.0

Abstract:

Velocity distributions of molecular beams of hydrogen, argon, and a mixture of both gases were studied with a transit-time apparatus. It is shown that the use of a Laval nozzle can reduce the relative half-value widths of distributions in pure gases by a factor of 2, relative to normal oven beams. Most probable velocities of 2700, 1450, and 960 msec are obtained for hydrogen molecular beams generated with the nozzle at room temperature, with liquid air as a coolant, and with liquid hydrogen as a coolant. A practically pure argon beam, with a most probable velocity of 1240 msec and a half-value width of 260 msec, can be obtained at room temperature by accelerating a mixture of 20 argon and 80 hydrogen and then removing the light component. The low relative half-value width of velocity distribution and the large absolute velocity allow the flux density of argon to be raised by one or two orders of magnitude versus that of a normally generated molecular beam. Author

Descriptors:

• *MOLECULAR BEAMS)
• (*LAVAL NOZZLES
• HYDROGEN
• ARGON
• GASES
• COOLANTS
• VELOCITY
• SCATTERING
• DENSITY
• IONIZATION
• NOZZLE GAS FLOW
• DISTRIBUTION FUNCTIONS
• PARTICLES
• DETECTORS
• PRESSURE
• MIXTURES

Subject Categories:

• Test Facilities, Equipment and Methods
• Nuclear Physics and Elementary Particle Physics
• Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE