Radio frequency antenna used in ultrahigh vacuum cavity and equivalent circuit thereof
A radio frequency antenna and equivalent circuit technology, applied in the field of effective circuits, can solve the problem that the signal cannot be effectively fed into the vacuum cavity, and achieve the effects of good electromagnetic compatibility, low power consumption, and high polarization degree
Pending Publication Date: 2022-08-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
At the same time, due to the reflection of the metal cavity, most of the signals will be shielded and cannot be effectively fed into the vacuum cavity, and the leakage of high-power radio frequency will cause serious electromagnetic compatibility problems
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[0039] In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited by this.
[0040] see figure 1 and figure 2 . figure 1 is the schematic diagram of the antenna and the magneto-optical trap, figure 2 It is a schematic structural diagram of the radio frequency antenna used in the ultra-high vacuum cavity of the present invention. As shown in the figure, a radio frequency antenna used in an ultra-high vacuum chamber includes a cooling optical cross-optical path module 1 , a coil module 2 , an upper and lower interface flange module 3 , a connecting straight wire module 4 and a circular arc antenna module 5 . The cross optical path module 1 and the coil module 2 are used to form a magneto-optical trap. The upper and lower int...
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A radio frequency antenna installed in an ultrahigh vacuum chamber comprises an upper interface flange module, a lower interface flange module, a connecting straight wire module and an opening type multi-section similar arc antenna module. Wherein the upper and lower interface flange modules are used for ensuring vacuum sealing; the straight wire connecting module is used for transmitting excitation signals and impedance matching; and the open type multi-section similar arc antenna module is used for providing three sections of elliptic arc antennas with eccentricity approximate to 1. The whole antenna has an ultra-wide impedance bandwidth from direct current to 127MHz, and can radiate an effective radio frequency signal with the polarization degree of 0.9987 and the signal strength of 53.6 mG in an atomic interaction area under the condition of low feed-in power of 3W. According to the invention, not only can the radio frequency power requirement be reduced by 90%, but also the vacuum degree of the system can be maintained to be superior to 2.1 * 10 <-8 > Pa, and the electromagnetic compatibility is good. The invention is applied to a space ultra-cold atom physics experiment device, and can provide a radio frequency antenna installed in an ultra-high vacuum chamber for experiments of radio frequency induced evaporative cooling and radio frequency state preparation.
Description
technical field [0001] The invention relates to the technical field of evaporative cooling, in particular to a radio frequency antenna used in an ultra-high vacuum cavity and an equivalent circuit thereof. Background technique [0002] The pursuit of further realization of ultra-low temperatures is one of the important driving forces for cold atom technology today. Laser cooling and trapping cool atoms down to the microkelvin scale, which has great application value in dark matter detection, precision measurement and deep space navigation. The ultra-cold field has opened up the fields of quantum simulation and quantum information. For alkali metal atoms, the well-established protocols for obtaining a large number of high-density ultracold atoms and molecules in the laboratory are optical trap evaporative cooling and magnetic trap evaporative cooling. Optical traps have faster evaporation rates and lower deployment difficulties. However, because the optical trap has no sel...
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Login to View More IPC IPC(8): H01Q1/22H01Q1/50H01Q1/36H01Q7/00H01Q23/00
CPCH01Q1/22H01Q1/50H01Q1/36H01Q7/00H01Q23/00
Inventor 汪斌谢昱周蜀渝李唐方苏刘亮
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI