Applications of non evaporable getter pump in vacuum metrology

Li, Detian; Cheng, Yongjun

doi:10.1016/j.vacuum.2010.11.008

Cited by 21 publications

(4 citation statements)

References 2 publications

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“…As reported by Maccallini et al [2], NEGs are widely used as pumps in industry, research and development (R&D) labs, research centers and large physics projects like accelerators, synchrotrons or fusion reactors [7,8]. Usually NEGs are preferred to others UHV and XHV systems (like turbo molecular, cryogenic or sputter-ion pumps) in those cases in which it is necessary to avoid vibration and generation of electromagnetic disturbances and when the space requirement is an issue.…”

Section: Introductionmentioning

confidence: 99%

Novel Non-Evaporable Getter Materials and Their Possible Use in Fusion Application for Tritium Recovery

et al. 2020

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Non-evaporable getters (NEGs) are metallic compounds of the IV group, particularly titanium and/or zirconium-based alloys and are usually used as pumps in vacuum technologies since they are able to sorb, by chemical reactions, most of the active gas molecules, with particular efficacy towards hydrogen isotopes. This work suggests an alternative application of these materials to fusion nuclear reactors, where there is the need to recover small amount of tritium from the large helium flow rate composing the primary coolant loop. Starting from the tritium mass balance inside the primary coolant loop, the amount of coolant to be routed inside the coolant purification system (CPS) is identified. Then a feasibility study, based on the bulk getter theory, is presented by considering three different commercial alloys, named ST707, ST101 and ZAO. The results provide the mass, the area and the regeneration parameters of the three different alloys necessary to fulfill the requirements of the CPS unit. By comparing the features of the three alloys, the ZAO material appears the most promising for the proposed application because it requires the lower amount of material and a lower number of regeneration cycles.

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Section: Introductionmentioning

confidence: 99%

Novel Non-Evaporable Getter Materials and Their Possible Use in Fusion Application for Tritium Recovery

et al. 2020

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“…In view of the wide application value of extremely high vacuum measurement and calibration technology in space program, nuclear fusion, and high-energy particle accelerator, etc., a UHV/XHV vacuum standard was constructed in LIP based on the creatively proposed ideas of flow separation and selective pumping background extension [6][7][8] (Figure 4). The measurement range is 10 -10 -10 -1 Pa, and the expanded uncertainty is 7-0.9% (k = 2).…”

Section: Calibration Of Total Pressurementioning

confidence: 99%

“…However, the lower limit of SEM method is limited to 10 -5 Pa resulting from the outgassing of the calibration chamber. We proposed a novel approach based on the idea of selective pumping, with which the lower limit of the SEM standard was extended to 10 -7 Pa [5,6]. DFM is a widely recognized method for high vacuum calibration, based on which LIP developed a standard with a lower limit of 10 -7 Pa [7].…”

Section: Introductionmentioning

confidence: 99%

Applications of Vacuum Measurement Technology in China’s Space Programs

Wang

Zhang

et al. 2021

Space Sci Technol

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The significance of vacuum measurement technology is increasingly prominent in China’s thriving space industry. Lanzhou Institute of Physics (LIP) has been dedicated to the development of payloads and space-related vacuum technology for decades, and widely participated in China’s space programs. In this paper, we present several payloads carried on satellites, spaceships, and space stations; the methodologies of which covered the fields of total and partial pressure measurement, vacuum and pressure leak detection, and standard gas inlet technology. Then, we introduce the corresponding calibration standards developed in LIP, which guaranteed the detection precision of these payloads. This review also provides some suggestions and expectations for the future development and application of vacuum measurement technology in space exploration.

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“…Therefore, the CAVM has a potential to become the original standard of vacuum metrology, and then develop into a new generation of vacuum metrology technology [18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Review of cold atom quantum-based vacuum metrology

FU,

HUANG,

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Quantum metrology technology is an advanced measurement method, which can achieve the accuracy that classical metrology is difficult to measure, and supplement the accuracy and stability defects caused by the standard quantum limit. In addition, reproducing quantum effects and quantum phenomena into units of metrology, which is obviously superior to the traditional measurement technology in terms of measurement accuracy, sensitivity and stability that could realize the quantum value transfer and traceability activities. With the development of laser cooling and trapping atom technology, the pressure measurement range of cold atom quantum-based vacuum metrology(CAVM) may reach 10 -4 ~10 -10 Pa or even lower . Benefiting from the loss rate of cold atoms in CAVM is only controlled by the collision cross section between cold atoms and gases, CAVM has the potential to develop into a emerging generation of vacuum metrology technology 27 . In this paper, the basic concept, structure and working principle of magneto-optical traps(MOT) for laser cooling atoms and trapping atoms are briefly described; Then, the basic principle of the CAVM is introduced. Furthermore, through collecting and sorting out a large number of literature about this technology, the advantages and key technologies of this technique in recent years are comprehensively analyzed and summarized; Finally, the developing trend of the CAVM is prospected.

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Applications of non evaporable getter pump in vacuum metrology

Cited by 21 publications

References 2 publications

Novel Non-Evaporable Getter Materials and Their Possible Use in Fusion Application for Tritium Recovery

Novel Non-Evaporable Getter Materials and Their Possible Use in Fusion Application for Tritium Recovery

Applications of Vacuum Measurement Technology in China’s Space Programs

Review of cold atom quantum-based vacuum metrology

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