Permanent magnet trap for cold atoms

Abstract

We report the trapping of neutral atoms in a permanent magnet trap. Approximately 1X10 ground-state lithium atoms have been confined in a nonzero magnetic-field minimum produced by six permanent magnets in an Ioffe configuration. These atoms have a kinetic temperature of 1.1 mK and a peak density of approximately 3 X 10 cm. The trapped-atom lifetime is 240 s, limited by collisions with background gas. This trap provides an environment in which quantum-statistical effects, atomic collisions, and other ultralow-temperature phenomena can be studied.

RF-Induced Evaporative Cooling And BEC In A High Magnetic Field

“…It follows the scheme of Tollett et al 7 . Instead of using permanent magnets, we use pure iron pole pieces excited by coils, which allows us to vary the trap configuration.…”

D-dimensional Bose gases and the Lambert W function

“…As a consequence, much recent work in mathematical physics has been devoted to deriving approximate analytic expressions for the thermodynamic properties of both Bose and Fermi gases trapped by external potentials. 19,32,33,35 Here we consider one-and two-dimensional trapped ideal Bose gases with a finite number of particles near the BEC regime. We derive the condensate temperature for a one-dimensional ideal Bose gas in a harmonic potential in terms of the W function.…”

“…Such experimental designs are usually composed of permanent magnets arranged in such a way that a minimum in the potential of the constituent particles is obtained at some known location, creating a trap. 35 These traps coupled with sophisticated cooling techniques provide environments in which quantum statistical effects, atomic collisions, and other low-temperature phenomena can be studied. Not long after the development of these experimental techniques the observation of BEC was achieved.…”

Confinement of two-dimensional excitons in a nonhomogeneous magnetic field

“…However, for the most part, all the attention has been focused on the influence of homogenous fields on the exciton inner properties. Several theoretical investigations and experiments show the possibility of trapping and guiding of atoms by means of non-homogeneous magnetic fields 7,8 . Recently, numerous papers 9 have appeared on the properties of charged particles, like e. g. electrons, in different non-homogeneous magnetic field profiles.…”