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Enhanced buffer gas loading :Cooling and trapping of atoms with low effective magnetic moments

Record Type:	Electronic resources : Monograph/item
Title/Author:	Enhanced buffer gas loading :
Reminder of title:	Cooling and trapping of atoms with low effective magnetic moments
Author:	Michniak, Robert.
Description:	222 p.
Notes:	Adviser: John Doyle.
Notes:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2456.
Contained By:	Dissertation Abstracts International65-05B.
Subject:	Physics, Atomic.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3131933
ISBN:	0496791737

Enhanced buffer gas loading :Cooling and trapping of atoms with low effective magnetic moments
Michniak, Robert.

Enhanced buffer gas loading :Cooling and trapping of atoms with low effective magnetic moments [electronic resource] - 222 p.

Adviser: John Doyle.

Thesis (Ph.D.)--Harvard University, 2004.

A new technique for buffer gas loading is described. This technique greatly extends the range of atoms and molecules that may be magnetically trapped at low temperature. The advance is made possible by the rapid removal of the buffer gas on a time scale one hundred times greater than in previous buffer gas loading experiments. A new cryogenic valve is developed and employed. The following benchmarks were attained in our first experimental run; approximately 1012 atoms with effective magnetic moments mu eff &gsim; 3muB were trapped and thermally isolated with near unit efficiency, &sim;1010 mueff = 2muB atoms were trapped and thermally isolated, and &sim;109 mueff = 1mu B atoms were trapped, but without thermal isolation. For comparison, all previous buffer gas loading experiments that achieved thermal isolation after trapping were done with atoms having a magnetic moment of at least 6mu B. In our second run of the experiment, better temperature management allowed us to increase the number of trapped and thermally isolated mu eff = 2muB atoms to &sim;10 11 and trapped mueff = 1mu B atoms to &sim;1010. The performance of the present apparatus is limited by the presence of a desorbing helium film that compromises the vacuum in the cell after the bulk of the buffer gas is removed. Future improvements to address this problem are suggested that will likely allow for efficient trapping and thermal isolation of atoms and molecules with magnetic moments as low as 1muB. Analysis of the trapping and pumping dynamics is presented.

ISBN: 0496791737Subjects--Topical Terms:

227348
Physics, Atomic.

Enhanced buffer gas loading :Cooling and trapping of atoms with low effective magnetic moments
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500 $a Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2456.
502 $a Thesis (Ph.D.)--Harvard University, 2004.
520 # $a A new technique for buffer gas loading is described. This technique greatly extends the range of atoms and molecules that may be magnetically trapped at low temperature. The advance is made possible by the rapid removal of the buffer gas on a time scale one hundred times greater than in previous buffer gas loading experiments. A new cryogenic valve is developed and employed. The following benchmarks were attained in our first experimental run; approximately 1012 atoms with effective magnetic moments mu eff &gsim; 3muB were trapped and thermally isolated with near unit efficiency, &sim;1010 mueff = 2muB atoms were trapped and thermally isolated, and &sim;109 mueff = 1mu B atoms were trapped, but without thermal isolation. For comparison, all previous buffer gas loading experiments that achieved thermal isolation after trapping were done with atoms having a magnetic moment of at least 6mu B. In our second run of the experiment, better temperature management allowed us to increase the number of trapped and thermally isolated mu eff = 2muB atoms to &sim;10 11 and trapped mueff = 1mu B atoms to &sim;1010. The performance of the present apparatus is limited by the presence of a desorbing helium film that compromises the vacuum in the cell after the bulk of the buffer gas is removed. Future improvements to address this problem are suggested that will likely allow for efficient trapping and thermal isolation of atoms and molecules with magnetic moments as low as 1muB. Analysis of the trapping and pumping dynamics is presented.
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