Simulation of cryogenic buffer gas beams

  title={Simulation of cryogenic buffer gas beams},
  author={Yuiki Takahashi and David Shlivko and Gabriel Woolls and Nicholas R. Hutzler},
  journal={arXiv: Atomic Physics},
The cryogenic buffer gas beam (CBGB) is an important tool in the study of cold and ultracold molecules. While there are known techniques to enhance desired beam properties, such as high flux, low velocity, or reduced divergence, they have generally not undergone detailed numerical optimization. Numerical simulation of buffer gas beams is challenging, as the relevant dynamics occur in regions where the density varies by orders of magnitude, rendering standard numerical methods unreliable or… Expand
1 Citations
Optimizing pulsed-laser ablation production of AlCl molecules for laser cooling.
It is shown that pulsed-laser ablation of stable, non-toxic mixtures of Al with alkali or alkaline earth chlorides, denoted XCln, can provide a robust and reliable source of cold AlCl molecules. Expand


A cold and slow molecular beam.
A cold, hydrodynamically extracted beam of calcium monohydride molecules with a near effusive velocity distribution is produced using a two-stage cryogenic buffer gas cell, and Beam dynamics, thermalization and slowing are studied using laser spectroscopy. Expand
Optimized cell geometry for buffer-gas-cooled molecular-beam sources
We have designed, constructed, and commissioned a cryogenic helium buffer-gas source for producing a cryogenially-cooled molecular beam and evaluated the effect of different cell geometries on theExpand
Characterization of a cryogenic beam source for atoms and molecules.
A finite element model is used to simulate the flow dynamics and the predictions of this model are used to interpret the experimental results of beam formation from a cryogenic buffer gas cell. Expand
The buffer gas beam: an intense, cold, and slow source for atoms and molecules.
A survey of the current state of the art in buffer gas beams is presented, and some of the possible future directions that these new methods might take are explored. Expand
A cryogenic beam of refractory, chemically reactive molecules with expansion cooling.
Cryogenically cooled buffer gas beam sources of the molecule thorium monoxide (ThO) are optimized and characterized and shown to produce ThO beams with high flux, low divergence, low forward velocity, and cold internal temperature for a variety of stagnation densities and nozzle diameters. Expand
High-flux beam source for cold, slow atoms or molecules.
This work demonstrates and characterize a high-flux beam source for cold, slow atoms or molecules, and compares favorably to existing techniques of beam formation, for a variety of applications. Expand
Shaped nozzles for cryogenic buffer-gas beam sources
Cryogenic buffer-gas beams are important sources of cold molecules. In this work we explore the use of a converging-diverging nozzle with a buffer-gas beam. We find that, under appropriateExpand
Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell.
The DSMC calculations show that thermalisation occurs well within the typical 10-20 mm length of many buffer gas cells, suggesting that shorter cells could be employed in many instances-yielding a higher flux of cold molecules. Expand
Buffer-gas cooling of atomic and molecular beams
We demonstrate direct loading and cooling of a thermal beam into a cryogenic helium buffer gas. Our test species is rubidium; we observe a thermal beam withExpand
A bright, slow cryogenic molecular beam source for free radicals.
A cryogenic buffer gas-cooled molecular beam source capable of producing bright beams of free radicals and refractory species for many types of experiments is demonstrated and characterized. Expand