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Article overview
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Characterizing the Optical Trapping of Rare Isotopes by Monte Carlo Simulation | | D. H. Potterveld
; S. A. Fromm
; K. G. Bailey
; M. Bishof
; D. W. Booth
; M. R. Dietrich
; J. P. Greene
; R. J. Holt
; M. R. Kalita
; W. Korsch
; N. D. Lemke
; P. Mueller
; T. P. O'Connor
; R. H. Parker
; T. Rabga
; J. T. Singh
; | | Date: |
19 Mar 2019 | | Abstract: | Optical trapping techniques are an efficient way to probe limited quantities
of rare isotopes. In order to achieve the highest possible measurement
precision, it is critical to optimize the optical trapping efficiency. This
work presents the development of a three-dimensional semi-classical Monte Carlo
simulation of the optical trapping process and its application to optimizing
the optical trapping efficiency of Radium for use in the search of the
permanent electric dipole moment of $^{225}$Ra. The simulation includes an
effusive-oven atomic beam source, transverse cooling and Zeeman slowing of an
atomic beam, a three-dimensional magneto-optical trap, and additional processes
such as collisions with residual gas molecules. We benchmark the simulation
against a well-characterized $^{88}$Sr optical trap before applying it to the
$^{225}$Ra optical trap. The simulation reproduces the relative gains in
optical trapping efficiency measured in both the $^{88}$Sr and $^{225}$Ra
optical traps. The measured and simulated values of the overall optical
trapping efficiencies for $^{88}$Sr are in agreement; however, they differ by a
factor of $30$ for $^{225}$Ra. Studies of several potential imperfections in
the apparatus or systematic effects, such as atomic beam source misalignment
and laser frequency noise, show only limited effects on the simulated trapping
efficiency for $^{225}$Ra. We rule out any one systematic effect as the sole
cause of the discrepancy between the simulated and measured $^{225}$Ra optical
trapping efficiencies; but, we do expect that a combination of systematic
effects contribute to this discrepancy. The accurate relative gains predicted
by the simulation prove that it is useful for testing planned upgrades to the
apparatus. | | Source: | arXiv, 1903.7798 | | Services: | Forum | Review | PDF | Favorites | |
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