Temperature and heating rate of ion crystals in Penning traps
- National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)
We have determined the temperature and heating rate of laser-cooled ions in a Penning trap using Doppler laser spectroscopy. Between 10{sup 4} and 10{sup 6} {sup 9}Be{sup +} ions are trapped in a Penning trap and Doppler laser cooled to temperatures of a few millikelvin, where they form ion crystals. This system is an example of a strongly coupled one-component plasma. The ion temperature was measured as a function of time after turning off the laser-cooling. In the solid phase, we measured a heating rate of {approx}65 mK/s. Information about possible heating mechanisms was obtained directly from temperature measurements, and also from measurements of the rate of radial expansion of the ion plasma. We determined that the observed heating is due to collisions with the {approx}4x10{sup -9} Pa residual gas of our vacuum system.
- OSTI ID:
- 20646077
- Journal Information:
- Physical Review. A, Vol. 70, Issue 3; Other Information: DOI: 10.1103/PhysRevA.70.033401; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BERYLLIUM 9
BERYLLIUM IONS
COOLING
ELECTRON TEMPERATURE
HEATING
HEATING RATE
ION TEMPERATURE
IONIC CRYSTALS
LASER SPECTROSCOPY
PHOTON-ATOM COLLISIONS
PLASMA
RADIATION PRESSURE
SOLIDS
TEMPERATURE MEASUREMENT
TIME DEPENDENCE
TRAPPING
TRAPS
VACUUM SYSTEMS