We demonstrate the continuous injection and propagation of a cold atomic beam in a high-gradient (up to $2.7\phantom{\rule{0.3em}{0ex}}\mathrm{kG}∕\mathrm{cm}$ ) magnetic guide of $1.7\phantom{\rule{0.3em}{0ex}}\mathrm{m}$ length. Continuous injection is accomplished using a side-loading scheme that involves a sequence of two modified magneto-optic traps. Methods are developed to measure the atomic-flow temperatures and the flux under steady-state conditions. In the high-gradient portion of the guide, the guided atomic beam has a transverse temperature of $420\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}\ifmmode\pm\else\textpm\fi{}40\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, a longitudinal temperature of $1\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$ , and an average velocity of order $1\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s}$ . Using a radio-frequency current of a fixed frequency $\ensuremath{\nu}$ coupled directly into the guide wires, atoms exceeding a transverse energy of $h\ensuremath{\nu}$ can be continuously and selectively removed from the atomic beam.We demonstrate the continuous injection and propagation of a cold atomic beam in a high-gradient (up to $2.7\phantom{\rule{0.3em}{0ex}}\mathrm{kG}∕\mathrm{cm}$) magnetic guide of $1.7\phantom{\rule{0.3em}{0ex}}\mathrm{m}$ length. Continuous injection is accomplished using a side-loading scheme that involves a sequence of two modified magneto-optic traps. Methods are developed to measure the atomic-flow temperatures and the flux under steady-state conditions. In the high-gradient portion of the guide, the guided atomic beam has a transverse temperature of $420\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}\ifmmode\pm\else\textpm\fi{}40\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, a longitudinal temperature of $1\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$, and an average velocity of order $1\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s}$. Using a radio-frequency current of a fixed frequency $\ensuremath{\nu}$ coupled directly into the guide wires, atoms exceeding a transverse energy of $h\ensuremath{\nu}$ can be continuously and selectively removed from the atomic beam.

Physical Review AMar 29, 200629 citations

Electromagnetic Trapping of Cold Atoms: An Overview

Vladilen S Letokhov

Springer eBooksJan 1, 20021 citation

Agile Radio Frequency Source for Hyperfine Manipulation of Ultra-Cold Atoms

Justin M. Winkler

This thesis describes the design, construction, and testing of a radio frequency signal source for generating rapidly changing frequencies in a repeatable and phase continuous manner. The radio frequency (RF) signal is generated by a Direct Digital Synthesizer (DDS) which is controlled by a triggerable microprocessor unit which is itself remotely programmed through an Ethernet connection. Waveforms generated by the RF source can be used for direct RF evaporation or RF manipulation of magnetic trapping potentials for ultra-cold atoms on an atom chip. The ultimate objective of the project is to mix the RF signal with higher frequency carrier waves to generate microwaves for the manipulation of hyperfine states of ultra-cold atoms of potassium and rubidium.This thesis describes the design, construction, and testing of a radio frequency signal source for generating rapidly changing frequencies in a repeatable and phase continuous manner. The radio frequency (RF) signal is generated by a Direct Digital Synthesizer (DDS) which is controlled by a triggerable microprocessor unit which is itself remotely programmed through an Ethernet connection. Waveforms generated by the RF source can be used for direct RF evaporation or RF manipulation of magnetic trapping potentials for ultra-cold atoms on an atom chip. The ultimate objective of the project is to mix the RF signal with higher frequency carrier waves to generate microwaves for the manipulation of hyperfine states of ultra-cold atoms of potassium and rubidium.

May 13, 20090 citations

Propagation of guided cold atoms

Thierry Lahaye, P. Cren, Christian F. Roos +1 more

arXiv:cond-mat/0211661Communications in Nonlinear Science and Numerical SimulationJun 2, 200312 citations

Magnetic Guiding of Neutral Atoms with Simple Wire Structures

J. A. Sauer, M. D. Barrett, David Zhu +1 more

APSMay 1, 20010 citations

We demonstrate the continuous injection and propagation of a cold atomic beam in a high-gradient (up to

2.7\phantom{\rule{0.3em}{0ex}}\mathrm{kG}∕\mathrm{cm}

) magnetic guide of

1.7\phantom{\rule{0.3em}{0ex}}\mathrm{m}

length. Continuous injection is accomplished using a side-loading scheme that involves a sequence of two modified magneto-optic traps. Methods are developed to measure the atomic-flow temperatures and the flux under steady-state conditions. In the high-gradient portion of the guide, the guided atomic beam has a transverse temperature of $420\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}\ifmmode\pm\else\textpm\fi{}40\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, a longitudinal temperature of

1\phantom{\rule{0.3em}{0ex}}\mathrm{mK}

, and an average velocity of order

1\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s}

. Using a radio-frequency current of a fixed frequency $\ensuremath{\nu}$ coupled directly into the guide wires, atoms exceeding a transverse energy of $h\ensuremath{\nu}$ can be continuously and selectively removed from the atomic beam.