Advertisement

Hyperfine Interactions

, Volume 212, Issue 1–3, pp 125–132 | Cite as

Compression of positron clouds using rotating wall electric fields

  • Dirk Peter van der WerfEmail author
  • Christopher Aled Isaac
  • Christopher John Baker
  • Timothy Mortensen
  • Michael Charlton
Article
  • 186 Downloads

Abstract

An asymmetric dipolar rotating electric field can be used to compress a trapped cloud of positrons when applied with a frequency close that of their axial bounce, and in the presence of a low pressure molecular gas to provide cooling. Measurements of the compression rate and associated parameters are presented and compared with results of a theory we have developed. The latter treats positron behaviour in a perfect Penning trap potential, in the presence of the rotating field, with the cooling modelled in the Stokes viscous drag approximation. Good agreement between the theory and experiment has been found, which has allowed us to identify the phenomenon as a new form of sideband cooling.

Keywords

Positron Compression Rotating wall Penning trap 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Amoretti, M., et al.: Nature 419, 456 (2002)ADSCrossRefGoogle Scholar
  2. 2.
    Gabrielse, G., et al.: Phys. Rev. Lett. 89, 213401 (2002)ADSCrossRefGoogle Scholar
  3. 3.
    Andresen, G.B., et al.: Nature 468, 673 (2010)ADSCrossRefGoogle Scholar
  4. 4.
    Cassidy, D.B., Mills A.P., Jr.: Nature 449, 195 (2007)ADSCrossRefGoogle Scholar
  5. 5.
    Jørgensen, L.V., et al.: Phys. Rev. Lett. 95, 025002 (2005)ADSCrossRefGoogle Scholar
  6. 6.
    Dubin, D.H.E., O’Neil, T.M.: Rev. Mod. Phys. 71, 87 (1999)ADSCrossRefGoogle Scholar
  7. 7.
    Brown, L.S., Gabrielse, G.: Rev. Mod. Phys. 58, 233 (1986)ADSCrossRefGoogle Scholar
  8. 8.
    Huang, X.P., Anderegg, F., Hollmann, E., Driscoll, C., O’Neil, T.: Phys. Rev. Lett. 78, 875 (1997)ADSCrossRefGoogle Scholar
  9. 9.
    Anderegg, F., Hollmann, E.M., Driscoll, C.F.: Phys. Rev. Lett. 81, 4875 (1998)ADSCrossRefGoogle Scholar
  10. 10.
    Danielson, J.R., Surko, C.M.: Phys. Rev. Lett. 94, 035001 (2005)ADSCrossRefGoogle Scholar
  11. 11.
    Danielson, J.R., Surko, C.M., O’Neil, T.M.: Phys. Rev. Lett. 99, 135005 (2007)ADSCrossRefGoogle Scholar
  12. 12.
    Wineland, D., Dehmelt, H.: Int. J. Mass Spectrom. Ion Process. 16, 338 (1974)Google Scholar
  13. 13.
    Savard, G.: et al.: Phys. Lett. A 158, 247 (1991)ADSCrossRefGoogle Scholar
  14. 14.
    Powell, H.F., Segal, D.M., Thompson, R.C.: Phys. Rev. Lett. 89, 093003 (2002)ADSCrossRefGoogle Scholar
  15. 15.
    Kellerbauer, A., et al.: Phys. Rev. A 73, 062508 (2006)ADSCrossRefGoogle Scholar
  16. 16.
    Cassidy, D.B., Deng, S.H.M., Greaves, R.G., Mills, A.P., Jr.: Rev. Sci. Instrum. 77, 073106 (2006)ADSCrossRefGoogle Scholar
  17. 17.
    Greaves, R.G., Moxom, J.M.: Phys. Plasmas 15, 072304 (2008)ADSCrossRefGoogle Scholar
  18. 18.
    Clarke, J., et al.: Rev. Sci. Instrum. 77, 063302 (2006)ADSCrossRefGoogle Scholar
  19. 19.
    Surko, C.M., Gribakin, G.F., Buckman, S.J.: J. Phys. B At. Mol. Opt. Phys. 41, 081001 (2008)ADSCrossRefGoogle Scholar
  20. 20.
    Greaves, R.G., Surko, C.M.: Phys. Rev. Lett. 85, 1883 (2000)ADSCrossRefGoogle Scholar
  21. 21.
    Al-Qaradawi, I., Charlton, M., Borozan, I., Whitehead, R.: J. Phys. B At. Mol. Opt. Phys. 33, 2725 (2000)ADSCrossRefGoogle Scholar
  22. 22.
    Isaac, C.A.: Axialisation of Particles in a Penning-type Trap by the Application of a Rotating Dipole Electric Field and its Application to Positron Accumulation. Swansea University (2011)Google Scholar
  23. 23.
    Isaac, C.A., Baker, C.J., Mortensen, T., van der Werf, D.P., Charlton, M.: Phys. Rev. Lett. 107, 033201 (2011)Google Scholar
  24. 24.
    Malmberg, J.H., Driscoll, C.F.: Phys. Rev. Lett. 44, 654 (1980)ADSCrossRefGoogle Scholar
  25. 25.
    Notte, J., Fajans, J.: Phys. Plasmas 1, 1123 (1994)ADSCrossRefGoogle Scholar
  26. 26.
    Charlton, M., Humberston, J.W.: Positron Physics. Cambridge University Press (2001)Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Dirk Peter van der Werf
    • 1
    Email author
  • Christopher Aled Isaac
    • 1
  • Christopher John Baker
    • 1
  • Timothy Mortensen
    • 1
  • Michael Charlton
    • 1
  1. 1.Physics DepartmentSwansea UniversitySwanseaUK

Personalised recommendations