PRODUCTION OF A MOLECULAR BEAM AT A VERY HIGH SPEED AND RELATIVELY GREAT DENSITY--REALIZATION OF A MOLECULAR GUN
An effort was made to obtain molecular beams with intensities exceeding 10/sup 18/ molecules/cm/sup 2//sec, with speeds ranging between 10 and 30 km/sec or higher. In order to have such a molecular beam, the charge or momentum exchange is produced between ions and a molecular beam. A cylindrical ionic beam is obtained by the high-frequency ionization of a molecular beam coming from a hypersonic nozzle. This beam passes through a quartz tube around which a coil is wound. A high-frequency current flows through the coil. The ionization efficiency exceeds 10%. The ions are separated from the molecules by means of a magnetic field generated by an electromagnet. Then, the ion beam is accelerated and brought to the satisfactory voltage by a linear accelerator and then crosses a molecular beam coming out of another hypersonic nozzle. In the interaction space of the two beams, charge or momentum exchanges are then produced and after deflection of ions and pumpage of slow molecules, we obtain a beam of highspeed molecules in the initial direction of the ion beam. The molecules belonging to the molecular beam are detected by means of a tungsten strip heated at a relatively low temperature. The speed is measured with a special device. The measurements that must be made by means of a high-speed molecular beam are carried out in a test chamber where a model carriage is placed. This carriage is apt to move into two directions. The apparatus, "Molecular Gun," has three diffusion pumps and two large primary pumps. In preliminary researches carried out in a vacuum tank, a beam of 3 x 1O/sup 16/ molecules/cm/sup 2//sec was produced. The described apparatus permits studies of all the interactions phenomena between a body moving at a cosmic speed and a very rarefied gas in free molecular flow regime. (auth)
- Research Organization:
- Laboratoire Mediterraneen de Recherches Thermodynamiques, Nice
- DOE Contract Number:
- AF61(052)296
- NSA Number:
- NSA-15-007870
- OSTI ID:
- 4114071
- Report Number(s):
- AFOSR-TN-60-906; AD-244407
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- United States
- Language:
- English
Similar Records
A molecular beam detector with electron-bombardment ionization and quadrupole mass filter
A short pulse (7 {mu}s FWHM) and high repetition rate (dc-5kHz) cantilever piezovalve for pulsed atomic and molecular beams
Related Subjects
BEAMS
COILS
CURRENTS
CYLINDERS
DETECTION
DIFFUSION
EFFICIENCY
ELECTRIC CHARGES
ENERGY
ENERGY RANGE
FREQUENCY
GAS FLOW
HEATING
INSTRUMENTS
INTERACTIONS
ION BEAMS
IONIZATION
IONS
LINEAR ACCELERATORS
MAGNETIC FIELDS
MAGNETISM
MEASURED VALUES
MOLECULES
MOMENTUM
NOZZLES
PUMPS
QUARTZ
SEPARATION PROCESSES
TUBES
TUNGSTEN
ULTRASONICS
VACUUM
VELOCITY