Skip to main content
SpringerLink
Log in

Temperature stability of magnetic field for periodic permanent-magnet focusing system

  • Published:
Rare Metals Aims and scope Submit manuscript

Abstract

In this study, finite element analysis based on an Ansoft Maxwell software was used to reveal the temperature stability of a magnet ring and the equivalent structural periodic permanent-magnet (PPM) focusing system. It is found that with the temperature increasing, the decrease rate of magnetic induction peak (B z)max of single magnet ring is greater than that of remanence B r of magnet in the range from room temperature to 200 °C, however, the PPM focusing system do have the same temperature characteristics of permanent-magnet materials. It indicates that the magnetic temperature properties of the PPM system can be effectively controlled by adjusting the temperature properties of the magnets. Moreover, the higher permeability of the magnets indicates the less H cb, giving rise to lower magnetic induction peak \( ( {B_{\text{z}} })^{\prime }_{\hbox{max} }. \) Finally, it should be noted that the magnetic orientation deviation angle θ (<15°) of permanent magnets has little effect on the focusing magnetic field of the PPM system at different temperatures and the temperature stability. The obtained results are beneficial to the design and selection of permanent magnets for PPM focusing system.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5

Similar content being viewed by others

References

  1. Akyildiz IF, Stuntebeck EP. Wireless underground sensor networks: research challenges. Ad Hoc Netw. 2006;4(6):669.

    Article  Google Scholar 

  2. Li L, Vuran M C, Akyildiz I F. Characteristics of underground channel for wireless underground sensor networks. In: Proceedings of the Sixth Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc-Net ‘07). Corfu, Greece; 2007. 92.

  3. Akyildiz IF, Sun Z, Vuran MC. Signal propagation techniques for wireless underground communication networks. Phys Commun. 2009;2(3):167.

    Article  Google Scholar 

  4. Goebel DM, Liou RR, Menninger WL, Zhai XL, Adler EA. Development of linear travelling wave tube for telecommunications applications. IEEE Trans Electron Devices. 2001;48(1):74.

    Article  Google Scholar 

  5. Wu XP. Microwave vacuum devices during transit between centuries. Vac Electron. 2003;1:1.

    Google Scholar 

  6. Liao P, Yang ZH, Lei WQ, Liao L. Computer simulation of electron beam characteristic focused by periodic permanent magnets. High Power Laser Part Beams. 2004;16(1):68.

    Google Scholar 

  7. Bao JX, Wang MK, Wang JJ. Applications of Sm2Co17 permanent magnets in travelling wave tubes. Vac Electron. 2003;3:74.

    Google Scholar 

  8. Liu JF, Walmer MH. Thermal stability and performance data for SmCo 2:17 high-temperature magnets on PPM focusing structure. IEEE Trans Magn. 2005;52(5):899.

    Article  Google Scholar 

  9. Zhao GQ, Yue LN, Wang WX, Gong YB, Wei YY, Wang L. 2D simulation of periodic magnetic system with open magnetic rings. High Power Laser Part Beams. 2008;20(1):96.

    Google Scholar 

  10. Bao JX. Study of the periodic focusing system using permanent magnet in traveling wave tubes. Vac Electron. 2005;2:20.

    Google Scholar 

  11. Cai ZY, Lv GQ, Yang L, He ZC. Design of periodic permanent magnetic for traveling-wave tubes. Vac Electron. 2006;2:25.

    Google Scholar 

  12. Deng GS, Lv GQ, Chen ZQ, Yang L, Li ZL, Cai F. Design of new structure of transition region for periodic permanent magnetic focusing. High Power Laser Part Beams. 2007;19(7):1187.

    Google Scholar 

  13. Cheng LL, Xie H. Methods of preparing axial peak field of magnetic rings for travelling wave tube. J Magn Mater Devices. 2008;39(3):60.

    Google Scholar 

  14. Peng L, Li YX. Magnetic field along central axis for periodic permanent magnetic focusing system with open magnetic rings. High Power Laser Part Beams. 2011;23(9):2552.

    Article  Google Scholar 

  15. Wang LM, Gan B, Yuan T, Gao XS, Wang L, Wang JD, Zhang M. Optimization of periodic permanent magnet focusing system for traveling-wave tubes. J Magn Mater Devices. 2012;43(5):35.

    Google Scholar 

Download references

Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 61001120).

Author information

Authors and Affiliations

  1. Beijing Key Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Li Li, Jian-Ya Chen & Yun-Jie Liu

Authors
  1. Li Li
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Jian-Ya Chen
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yun-Jie Liu
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Li Li.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Li, L., Chen, JY. & Liu, YJ. Temperature stability of magnetic field for periodic permanent-magnet focusing system. Rare Met. 33, 180–184 (2014). https://doi.org/10.1007/s12598-013-0202-2

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12598-013-0202-2

Keywords

Search

Navigation