Progress Toward Buffer Gas Cooling of a 1 $\mu_B$ Species

ORAL

Abstract

Thermalization with a non-magnetic $^3$He buffer gas has been demonstrated to be an effective means of removing heat from a sample of hot magnetic atoms held in a magnetic trap[1]. To thermally isolate the atoms, it is necessary to remove the buffer gas without sweeping away the magnetically trapped atoms. The magnetic trap strength is proportional to the magnitude of the atom's moment. This is the primary reason that trapping a 1 $\mu_B$ species has never been realized in a buffer gas cooling experiment. Eventually, we plan to use this technique to trap and cool atomic hydrogen and deuterium. We have built a cryogenic valved cell suspended from a dilution refrigerator along the axis of a 4T quadrupole magnetic field. The cell is maintained at a base temperature of 100mK. The buffer gas is removed by opening the valve. Any remaining buffer gas may be energetic enough to scatter the atoms out of the trapping potential, thus limiting the lifetime. Therefore, we lower the temperature of the cell to decrease the vapor pressure of any $^3He$ remaining on the walls. We can mimic the conditions of a 1 $\mu_B$ species using atomic Mn (5 $\mu_B$) simply by lowering the trapping field strength by a factor of five. Further, we will report on efforts to trap and thermally isolate $^7$Li, a true 1 $\mu_B$ species. \\ \noindent [1]J. D. Weinstein et al., Phys.\ Rev.\ A {\bf57}, R3173 (1998). \\

Authors

  • Cort Johnson

  • Bonna Newman

  • Nathan Brahms

  • Robert DeCarvalho

  • Chih-Hao Li

  • Tom Greytak

  • Student Tutorials

    Department of Physics, University of California Berkeley, University of Arizona Tucson, University of Arizona, Tucson, Institute for Physical Science and Technology, University of Maryland, Department of Physics, University of Maryland, Centre for Quantum Information \& Quantum Control and Department of Chemistry, University of Toronto, CANADA, Centre for Quantum Information \& Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, CANADA, Dept. of Physics, University of Toronto, Dept. of Physics, University of Texas at Austin, Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston TX, 77251, Associate Director, Office of Basic Energy Sciences of the U.S. Department of Energy, Laser Centre, Vrije Universiteit, The Netherlands, University of Sussex, UK, Trent University, Canada and University of Sussex, UK, MIT/Harvard Center for Ultracold Atoms, University of Nebraska-Lincoln, University of Connecticut, University of lllinois, Urbana, Belfry School, KY, Howard University, DC, Butler University, IN, University of Amsterdam, Dept. of Physics, Harvard University, Dept. of Physics, University of British Columbia, Physics Stony Brook University, NY 11794-3800 USA, LBNL, Frankfurt Univ., KSU, Loras College, CC-CUNY, ALS/LBNL, University of Newcastle-Ourimbah, University of Nebraska, U. of Auburn, Kansas State Universiy, University of Frankfurt, Lawrence Berkeley National Laboratory, California Institute of Technology, Louisiana State U., U. 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