Perpendicular laser cooling of a rotating ion plasma in a Penning trap

Itano, W., Brewer, L.R., Larson, D. and Wineland, D. (1988) Perpendicular laser cooling of a rotating ion plasma in a Penning trap. Physical Review A: General Physics, 38(11), pp. 5698-5706. (doi: 10.1103/PhysRevA.38.5698)

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The steady-state temperature of an ion plasma in a Penning trap, cooled by a laser beam perpendicular to the trap axis, has been calculated and measured. The rotation of the plasma, due to crossed E and B fields, strongly affects the minimum attainable temperature. This is because the velocity distribution of the ions, as seen by a laser beam intersecting the plasma at some distance from the axis of rotation, is skewed, and this leads to a change in the velocity distribution (and hence temperature) at which a steady state is attained. The calculated temperature is a function of the intensity, frequency, and position of the laser beam, and of the rotation frequency of the plasma. Temperatures of <sup>9</sup>Be<sup>+</sup> plasmas were measured for a wide range of experimental parameters. The lowest and highest temperatures were approximately 40 mK and 2 K. The measured and calculated temperatures are in agreement.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Brewer, Dr Laurence
Authors: Itano, W., Brewer, L.R., Larson, D., and Wineland, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review A: General Physics

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