# Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change

## A temperature change, near-zero expansion technology, applied in dynamic spectrometers, trajectory-stabilized spectrometers, mass spectrometers, etc., to achieve the effect of improving dimensional stability and performance

Pending Publication Date: 2021-04-20

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## AI-Extracted Technical Summary

### Problems solved by technology

The difficulty lies in the high-precision and high-stability quadru...
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## Abstract

Application Domain

Technology Topic

Mass analysisLinear expansion coefficient +5

## Examples

• Experimental program(1)

### Example Embodiment

[0037]Embodiment:
[0038]For example, the geometry D = 12, r = 22, then R = D / (1.13 * 2) ≈ 5.31 is calculated. Then L = R-R-D = 4.69.
[0039]If the positioning cartridge 1 and the pole 3 employ alumina ceramics (the linear expansion coefficient is about 8E-6/ ° C), using the formula 4, the connection line expansion coefficient can be selected by A2 = (A1 * R-A3 * D) /L=17.05E-6/ ° C.
[0040]At this time, the connection 2 can select the wire expansion coefficient of copper, brass and other materials of about 17.05. For example, brass is in the range of 0-100 ° C, the linear expansion coefficient is about 17.11e-6/ ° C.
[0041]Using Formula 5, | A4 | = | (A1 * T * R-A2 * T * L-A3 * T * D) / (t * r) | = | (A1 * R-A2 * L-A3 * D) /R|=| 0.05E-6/ ° C | ≤ | 3e-6/ ° C |. Meet the requirements.
[0042] According to the above geometry and the connector, the quadrupole product changes from normal temperature 20 ° C to 50 ° C (temperature rise 30 ° C), the internal cut circle radius change amount is a4 * 30 ° C * 5.31 mm = -0.008 μm (ie --- 8nm). And if the connecting member 2 uses a common ceramic seal, the linear expansion coefficient is about 4.8E -6 / ° C, the amount of the inner cutting radius variation can be of 1.72 μm.
[0043] It should be noted that the design scheme obtained by adjusting the structural dimensions by similar techniques, such as fixed materials, such as fixed materials, so that | A4 | ≤ | 3e-6 / ° C |, all within the technical scope of this patent.
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## Description & Claims & Application Information

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