Accession Number : ADA187461

Title :   Forces on Neutral Atoms Due to Electromagnetic Fields.

Descriptive Note : Annual summary rept. 1 Sep 86-31 Aug 87,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Pritchard, David E

PDF Url : ADA187461

Report Date : Sep 1987

Pagination or Media Count : 5

Abstract : The construction of the superconducting magnetic trap was completed and, as a major breakthrough in the field, was used to trap large numbers of neutral sodium atoms approx. 10 to the 9th power for periods of several minutes. This represented an advance of several orders of magnitude compared to previous neutral trapping experiments, both in numbers of trapped atoms, and in trapping times achieved. The continuous loading process pioneered in this experiment has represented an important advance over previous pulsed loading schemes, as it has permitted the accumulation of much larger numbers of atoms in the trap. The fluorescence spectra of the trapped atoms is studied using a weak probe laser beam (I =(I sub sat/10,000), which does not affect the trapped atoms appreciably. Doppler cooling of the trapped atoms is studied using this spectrum to measure the temperature of the atomic sample. Observed, for the first time, is the effect of gravity on trapped atoms: the trapped atoms do not accumulate at the minimum of the magnetic field, but at the minimum of the total mechanical potential obtained when including the effect of gravity. RF resonance will be used to study the trapped atoms, and optical-RF cyclic cooling of the atoms will be used to attempt to achieve sample temperatures or = .000001 K.

Descriptors :   *ELECTROMAGNETIC FIELDS, *TRAPPING(CHARGED PARTICLES), *SUPERCONDUCTORS, ACCUMULATION, CONTINUOUS PROCESSING, ATOMS, NEUTRAL, SODIUM, COOLING, DOPPLER SYSTEMS, SPECTRA, MECHANICAL PROPERTIES, FLUORESCENCE, ENERGY TRANSFER, PULSES, LASER BEAMS, LOW INTENSITY, PROBES, OPTICAL PROCESSING, RADIOFREQUENCY, MAGNETIC FIELDS, RESONANCE

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE