A Dewar vacuum lifetime estimate based on Langmuir adsorption model

Fig. 4. （a）The ion current of the sample a1,（b）a2,（c）a3 in the degassing procedure and the fitting curve with formula（1）, the star shape data is the ion current after temperature rise

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Fig. 5. The curve is delta heatload VS pressures in Dewar obtained by structure，the spots are tesdted delta heatloads

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Table 1. The state of the sample a1-a3, the ion current before and after temperature rise, and the calculated outgassing activation energy
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Table 1. The state of the sample a1-a3, the ion current before and after temperature rise, and the calculated outgassing activation energy
样品排气时间/day 排气温度/℃ 升温后温度/℃ 升温前离子流/μA 升温后离子流/μA 激活能（KJ/mol）
a1 12 60 70 1.68 9.2 161
a2 12 70 80 1.99 8.4 145
a3 21 60 70 0.84 5.2 172

Table 2. The ion current of the sample b1-b4 at the end of degassing procedure, The storage time and the heatload at the end of storage, the calculated outgassing rate at the beginning of storage, the pressure and the increased heatload at the end of storage

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Table 2. The ion current of the sample b1-b4 at the end of degassing procedure, The storage time and the heatload at the end of storage, the calculated outgassing rate at the beginning of storage, the pressure and the increased heatload at the end of storage

Sample	b1	b2	b3	b4
排气结束离子流/μA	8.7	7.7	3.4	2.5
初始出气率/Pa·m³/s	4.2E-11	3.7E-11	1.6E-11	1.1E-11
存储时间/day	799	678	747	746
存储后压强/Pa	0.3	0.23	0.1	0.07
估算热负载增量/mW	356	289	142	102
实测热负载/mW	1100	872	847	702
实测热负载增量t/mW	444	216	191	46

Table 3. The vacuum lifetime of b1-b4 calculated with the outgassing activation energy and the state of samples at the end of degassing procedure
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Table 3. The vacuum lifetime of b1-b4 calculated with the outgassing activation energy and the state of samples at the end of degassing procedure
样品 b1 b2 b3 b4
排气时间（day） 3 6 12 22
真空寿命（day） 266 302 721 1 016

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Cui FAN, Xiao-Kun WANG, Peng JI, Lei ZHANG, Jun YU, Yi-Zhang SHEN, De-Feng MO, Xue LI. A Dewar vacuum lifetime estimate based on Langmuir adsorption model[J]. Journal of Infrared and Millimeter Waves, 2023, 42(4): 434

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Paper Information

Category: Research Articles

Received: Oct. 25, 2022

Accepted: --

Published Online: Aug. 1, 2023

The Author Email: Xiao-Kun WANG (lixue@mail.sitp.ac.cn), Xue LI (wxk-sitp@mail.sitp.ac.cn)

DOI:10.11972/j.issn.1001-9014.2023.04.002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. The state of the sample a1-a3, the ion current before and after temperature rise, and the calculated outgassing activation energy

Table 1. The state of the sample a1-a3, the ion current before and after temperature rise, and the calculated outgassing activation energy

Table 2. The ion current of the sample b1-b4 at the end of degassing procedure, The storage time and the heatload at the end of storage, the calculated outgassing rate at the beginning of storage, the pressure and the increased heatload at the end of storage

Table 2. The ion current of the sample b1-b4 at the end of degassing procedure, The storage time and the heatload at the end of storage, the calculated outgassing rate at the beginning of storage, the pressure and the increased heatload at the end of storage

Table 3. The vacuum lifetime of b1-b4 calculated with the outgassing activation energy and the state of samples at the end of degassing procedure

Table 3. The vacuum lifetime of b1-b4 calculated with the outgassing activation energy and the state of samples at the end of degassing procedure