Loss of cold atoms due to collisions with residual gases in free flight and in a magneto-optical trap<xref rid="cpb_27_7_073701_fn1" ref-type="fn">*</xref> <fn id="cpb_27_7_073701_fn1"> <label>*</label> <p>Project supported by the Ministry of Science and Technology of China (Grant No. 2013YQ09094304).</p> </fn>

Loss of cold atoms due to collisions with residual gases in free flight and in a magneto-optical trap* *

Project supported by the Ministry of Science and Technology of China (Grant No. 2013YQ09094304).

Xiang Jing-feng^{1, 2}, Cheng He-nan^{1, 2}, Peng Xiang-kai^{1, 2}, Wang Xin-wen^{1, 2}, Ren Wei¹, Ji Jing-wei¹, Liu Kang-kang¹, Zhao Jian-bo¹, Li Lin¹, Qu Qiu-zhi¹, Li Tang¹, Wang Bin¹, Ye Mei-feng¹, Zhao Xin¹, Yao Yuan-yuan¹, Lü De-Sheng^{1, †}, Liu Liang^{1, ‡}

(color online) The typical results of COMSOL: pressure distribution of hydrogen under different vacuum conditions. The numbers from (1) to (12) indicate the process of varying the vacuum conditions, the number (1) indicates the state of the vacuum valve being closed, and the number (12) indicates the state of the vacuum valve being completely opened.