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faraday cup

A Faraday cup and cup body technology, applied to the parts of the particle separator tube, etc., can solve the problems of inaccurate measurement, poor external shielding effect, simplicity, etc., and achieve the effect of accurate and effective collection

Inactive Publication Date: 2011-12-14
JIANGSU SKYRAY INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The ion flow that needs to be detected in the vacuum chamber of the mass spectrometer is at the picoamp level, so it is easy to be disturbed by the outside world, but the Faraday cup structure of the existing structure is too simple, the shielding effect on the outside is not very good, and it is easy to be interfered. resulting in inaccurate measurements

Method used

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] See figure 1 As shown, a Faraday cup includes an ion collection cup 6, the ion collection cup 6 includes an open end 9, a sealed end 10 and a cup body 11, and the cup body 11 is wrapped with an insulating cover 7, so The opening end 9 is provided with a front shielding cover 2, the sealing end 10 is provided with a rear shielding cover 3, and a front insulating baffle 8 is provided between the front shielding cover 2 and the opening end 9, and the rear shielding A rear insulating baffle 5 is added between the cover 3 and the sealing end 10 .

[0019] Further, the front shield 2 and the rear shield 3 are engaged with each other to form a cavity.

[0020] Preferably, a tapered hole 1 is opened on the front shield 2, and the diameter of the tapered hole 1 can be designed in various specifications ranging from 2 mm to the fully open ...

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Abstract

The invention discloses a Faraday cup, which includes an ion collection cup, the ion collection cup includes an open end, a sealed end and a cup body, the cup body is wrapped with an insulating cover, and the open end is provided with a There is a front shielding cover, a rear shielding cover is provided at the sealing end, a front insulating baffle is added between the front shielding cover and the opening end, and a rear insulating baffle is added between the rear shielding cover and the sealing end plate. The Faraday cup of the present invention adds a metal shield structure outside the ion collection cup, which can shield the interference caused by the scattered ions inside the vacuum cavity, and thus can accurately and effectively collect the number of target ions.

Description

technical field [0001] The invention relates to a device capable of collecting ions, in particular to a Faraday cup. Background technique [0002] Mass spectrometer, also known as mass spectrometer, is an instrument for separating and detecting different isotopes, that is, according to the principle that charged particles can be deflected in an electromagnetic field, it is a type of instrument that separates and detects the composition of substances according to the mass difference of atoms, molecules or molecular fragments of substances. . The core of mass spectrometer is ion source, mass analyzer and ion detector. The ion source is a device that ionizes the sample molecules under high vacuum conditions. The ionized molecules will be further fragmented into a variety of fragment ions and neutral particles with smaller masses due to receiving too much energy. They acquire the average kinetic energy with the same energy under the action of the accelerating electric field a...

Claims

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Application Information

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IPC IPC(8): H01J49/02
Inventor 胡晓斌任建凯明晓芳
Owner JIANGSU SKYRAY INSTR
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