Efficient, Indirect Transverse Laser Cooling of a Fast Stored Ion Beam

Abstract

Three-dimensional laser cooling of a fast stored ion beam has been demonstrated at the Heidelberg Test Storage Ring. With a purely longitudinal cooling force applied to a 7.3 MeV 3 Be 1 beam, we have observed an efficient transverse cooling effect. We interpret this observation as being due to a thermal intrabeam relaxation between the different degrees of freedom that is caused by Coulomb collisions of the stored particles. [S0031-9007(96)

Optical trapping and manipulation of neutral particles using lasers

“…Tweezers was used to help measure the entropic forces of Ϸ40 fN that control motion of colloidal particles at passive surface microstructures (149). Laser light has been used to cool heavy ion beams in three dimensions for use in accelerators and storage rings (150).…”

Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

“…Then, the momentum transfer from the photons to the ions occurs only longitudinally, which means no direct cooling is expected in the transverse directions. Later, Miesner et al found that the transverse motion is sympathetically coolable via intrabeam scattering (IBS) [8], but the sympathetic cooling efficiency was not very high at an ordinary particle density. As pointed out by Madsen et al [9], IBS-induced sympathetic cooling may cease to be sufficiently strong when the beam gets cold enough to overcome heating by the spontaneous emitted photons, as well as by ring imperfections.…”

Short-Distance Atomic Beam Deceleration with a Stimulated Light Force

“…The rapid progress in high-power solid-state laser devices will allow one to produce even larger velocity capture ranges and larger forces, since they both scale approximately as the optical Rabi frequency. The unique properties of the stimulated bichromatic force make it interesting for many other applications in atom manipulation, atom lithography [25], and atom optics [26], such as slowing of rare gases or other, exotic elements with weak or not completely closed transitions [27], the transverse collimation of dense, strongly divergent atomic beams, the large-angle atomic-beam deflection, or the laser cooling of fast ion beams in storage rings [28].…”