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Controllable low-temperature mercury vapor source for ultrahigh vacuum system

A technology of ultra-high vacuum and mercury vapor, which is applied in the field of vacuum equipment and physical experiment equipment, and can solve problems such as no mercury vapor source technology

Inactive Publication Date: 2016-06-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, there are very few units in the world that conduct experiments related to laser cooling of mercury atoms, and there is no mature mercury vapor source technology

Method used

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  • Controllable low-temperature mercury vapor source for ultrahigh vacuum system
  • Controllable low-temperature mercury vapor source for ultrahigh vacuum system

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0019] The ultra-high vacuum environment requires low outgassing rate of the internal components and can withstand the baking process necessary for the ultra-high vacuum preparation process. At the same time, the present invention involves refrigeration and heat transfer, and the thermal conductivity of related components must meet the requirements. Therefore, the mercury cup and the heat sink in this embodiment are made of oxygen-free copper, which has the advantages of high thermal conductivity and low vacuum outgassing rate. The temperature sensor is a vacuum Pt100 platinum thermal resistance. It adopts Aoleng's 6-stage vacuum TEC, which is trapezoidal, and the maximum cooling temperature difference between the upper and lower sides can reach 131°C. The water flange is ...

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Abstract

A controllable low-temperature mercury vapor source for ultra-high vacuum systems. The bottom of the mercury cup is bonded to the top of the multi-stage semiconductor refrigeration chip (TEC), the bottom of the TEC is bonded to the top of the heat sink, and the heat sink is installed on the ultra-high vacuum system through the water flange. A temperature sensor is glued to the side wall of the mercury cup, and the temperature sensor and the TEC are electrically connected to the outside through Feedthrough. The mercury cup contains elemental mercury, and the mercury vapor can diffuse into the entire vacuum system. The invention realizes the control of the mercury vapor density inside the ultra-high vacuum system. When the TEC is energized, the mercury cup is refrigerated, and heat is generated and transferred to the heat sink. The cooling water enters the heat sink through the water flange to take away the heat. As the temperature decreases, the saturated vapor pressure corresponding to the elemental mercury in the mercury cup decreases, thereby reducing the mercury vapor density in the vacuum system. The temperature sensor can detect the temperature of the mercury cup, and the density of mercury vapor in the system can be controlled by controlling the TEC current.

Description

technical field [0001] The invention relates to the fields of physical experiment devices and vacuum equipment. The vapor pressure of metallic mercury is reduced through the cooling of the semiconductor refrigeration chip (TEC), so that a controllable concentration of mercury vapor is generated in the ultra-high vacuum system. Background technique [0002] In atomic physics experiments involving laser cooling, it is necessary to generate a certain concentration of background vapor of the atoms to be cooled in the vacuum system, so a specially designed vapor source is required. For atoms commonly used in laser cooling experiments such as Rb, Yb, and Sr, their vapor pressure at room temperature is very low, which is far from the concentration required for the experiment, so proper heating or electrical activation is required. As for mercury, it is in a liquid state at normal temperature, and its vapor pressure is too high. It needs to be cooled to make the concentration of th...

Claims

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Application Information

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IPC IPC(8): F22B3/00
CPCF22B3/00
Inventor 刘亢亢徐震刘洪力孙剑芳王育竹
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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