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Buffer gas loading and evaporative c...

Nguyen, Scott Vinh.

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Buffer gas loading and evaporative cooling in the multi-partial-wave regime.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Buffer gas loading and evaporative cooling in the multi-partial-wave regime./
作者:	Nguyen, Scott Vinh.
面頁冊數:	153 p.
附註:	Adviser: John Morrissey Doyle.
Contained By:	Dissertation Abstracts International67-05B.
標題:	Physics, Atomic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3217838
ISBN:	9780542693557

Buffer gas loading and evaporative cooling in the multi-partial-wave regime.
Nguyen, Scott Vinh.

Buffer gas loading and evaporative cooling in the multi-partial-wave regime. - 153 p.

Adviser: John Morrissey Doyle.

Thesis (Ph.D.)--Harvard University, 2006.

This thesis describes the study of collisions in the multi-partial-wave regime relevant to the buffer gas cooling and trapping of atoms. A quantitative model is formulated to describe the dynamics of evaporative cooling and is used to infer elastic and inelastic collision rate constants of g el = 2.15(+2.5, -1.2) x 10-10 cm 3/s and gin = 1.36(+1.2, -0.7) x 10-12 cm3/s between two chromium atoms in the temperature range of 0.02-1 K and explains a long standing discrepancy between theory and experiment. Magnetic trapping is then extended to atomic manganese where up to 2 x 1012 Mn atoms are trapped in all six hyperfine states, allowing for the exploration of the role of the hyperfine interaction in spin-exchange collisions. In addition, we simultaneously trap a 55Mn-52Cr mixture and measure an inter-species inelastic rate constant of gMn,cr = 1.5 (+/-0.2) +/- 10-13 cm3/s. Demonstrating that buffer gas loading is a viable alternative to laser cooling, we have magnetically trapped and evaporatively cooled metastable helium in large numbers. 10 11 4He* atoms are trapped at an initial temperature of 400 mK and evaporatively cooled into the ultracold regime, resulting in a cloud of 2 +/- 0.5 x 109 atoms at 1.4 +/- 0.2 mK and an increase in phase space density of 5 orders of magnitude. Efficient evaporation indicates low collisional loss for 4He* in both the ultracold and multi-partial-wave regime, in agreement with theory.

ISBN: 9780542693557Subjects--Topical Terms:

1029235
Physics, Atomic.

Buffer gas loading and evaporative cooling in the multi-partial-wave regime.
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520 $a This thesis describes the study of collisions in the multi-partial-wave regime relevant to the buffer gas cooling and trapping of atoms. A quantitative model is formulated to describe the dynamics of evaporative cooling and is used to infer elastic and inelastic collision rate constants of g el = 2.15(+2.5, -1.2) x 10-10 cm 3/s and gin = 1.36(+1.2, -0.7) x 10-12 cm3/s between two chromium atoms in the temperature range of 0.02-1 K and explains a long standing discrepancy between theory and experiment. Magnetic trapping is then extended to atomic manganese where up to 2 x 1012 Mn atoms are trapped in all six hyperfine states, allowing for the exploration of the role of the hyperfine interaction in spin-exchange collisions. In addition, we simultaneously trap a 55Mn-52Cr mixture and measure an inter-species inelastic rate constant of gMn,cr = 1.5 (+/-0.2) +/- 10-13 cm3/s. Demonstrating that buffer gas loading is a viable alternative to laser cooling, we have magnetically trapped and evaporatively cooled metastable helium in large numbers. 10 11 4He* atoms are trapped at an initial temperature of 400 mK and evaporatively cooled into the ultracold regime, resulting in a cloud of 2 +/- 0.5 x 109 atoms at 1.4 +/- 0.2 mK and an increase in phase space density of 5 orders of magnitude. Efficient evaporation indicates low collisional loss for 4He* in both the ultracold and multi-partial-wave regime, in agreement with theory.
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