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arXiv:1912.07934 · Laser Physics Letters

On the continuous loading of a U-magneto-optical trap on an atom-chip in an ultra high vacuum

Vivek Singh, Vibhuti Bhushan Tiwari, Satya Ram Mishra

Published Jan 28, 2020• 11 citations
arXivHTMLPDF

Abstract

Abstract Here, we report our studies on the continuous loading of a U-magneto-optical trap (U-MOT) on an atom-chip with a rubidium-(Rb)-vapor-generated background using a dispenser source in an ultra high vacuum environment. Using the U-MOT loading curves, the partial pressure due to the Rb vapor and the pressure due to the background gas have been estimated near the MOT cloud position. The estimated pressure due to the Rb vapor increased from ∼ Torr to Torr as the Rb-dispenser current was increased from 2.8 to 3.4 A. The increase in dispenser current also resulted in a decrease in loading time as well as the lifetime of the MOT cloud. This study will be useful for magnetic trapping experiments where accurate information of the pressure in a chamber is important for the lifetime of the magnetic trap.

DOI
10.1088/1612-202x/ab6736

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Abstract Here, we report our studies on the continuous loading of a U-magneto-optical trap (U-MOT) on an atom-chip with a rubidium-(Rb)-vapor-generated background using a dispenser source in an ultra high vacuum environment. Using the U-MOT loading curves, the partial pressure due to the Rb vapor and the pressure due to the background gas have been estimated near the MOT cloud position. The estimated pressure due to the Rb vapor increased from ∼ Torr to Torr as the Rb-dispenser current was increased from 2.8 to 3.4 A. The increase in dispenser current also resulted in a decrease in loading time as well as the lifetime of the MOT cloud. This study will be useful for magnetic trapping experiments where accurate information of the pressure in a chamber is important for the lifetime of the magnetic trap.
Abstract Here, we present studies on pulsed loading of a rubidium (Rb) magneto-optical trap (MOT) in an ultra-high vacuum (UHV) environment on an atom chip. We have used a parallel combination of Rb dispensers for better heat dissipation to achieve fast UHV recovery in the chamber after the end of the current pulse to the dispensers. We have estimated the threshold heat energy required for activation of the dispensers for different values of current pulses. Although a pulse with a higher current value and shorter duration has a lower threshold heat energy, we operated the dispensers at moderate current pulse parameters (24 A, 10 s) for protection of the circuits. Nearly, 3 × 10 7 cold 87 Rb atoms were loaded in the MOT using this current pulse, with a UHV recovery time of ∼600 ms in the chamber. This fast recovery of UHV in the MOT chamber is useful for further experiments such as magnetic trapping and evaporative cooling of atoms in the same chamber.
This study presents investigations on pulsed loading of a magneto-optical trap (MOT) on an atom chip in an UHV environment. Using three parallel resistively heated Rb-metal dispensers activated by pulsed current supply, approximately 3.0 ×\times× 10710^{7}107 cold 87Rb^{87}Rb87Rb atoms were loaded into the MOT. A current pulse of ∼\sim∼ 24 A with duration of ∼\sim∼ 10 s raised the pressure in the chamber from 2.0 ×\times× 10−1010^{-10}10−10 Torr to 3.3 ×\times× 10−1010^{-10}10−10 Torr. Remarkably, the pressure recovery time after switching off the dispensers current was found to be ∼\sim∼ 600 ms, making a significant advancement in achieving fast recovery of UHV environment surrounding the MOT region. This study is very useful for laser cooling and magnetic trapping / evaporative cooling of atoms on atom chip in the same UHV chamber.
In this work, the UHV background pressure as low as 1.1×10−10 Torr has been measured using the loss rate characteristics of a vapor-loaded magneto-optical trap (MOT) formed on an atom chip in a UHV chamber. The loss rate due to non-rubidium (Rb) gases in the background in the chamber has been estimated by operating the MOT in low cooling beam intensities and low Rb pressure regimes simultaneously. Using this approach, we minimized the contributions of the intra-trap collisions as well as background MOT species collisions to the measured trap loss rate in our setup. These results can be useful for development of cold-atom based UHV pressure standards.
We have developed a compact setup which enables loading a magneto-optical trap (MOT) in ultra-high vacuum (UHV) environment. Nearly 1×1081 \times 10^{8}1×108 atoms of 87Rb^{87}Rb87Rb are trapped in the MOT at ∼2×10−10\sim 2 \times 10^{-10}∼2×10−10 Torr base pressure in the chamber. After the MOT loading, we have successfully demonstrated working of quadrupole magnetic trap in this chamber with a lifetime of $\sim 8 $ s