Spatial separation of ion clouds between sympathetically laser-cooled<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Cd</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-ion isotopes in a Penning trap

Imajo, Hidetsuka; Hayasaka, Kazuhiro; Ohmukai, Ryuzo; Tanaka, U.; Watanabe, Masayoshi; Urabe, Shinji

doi:10.1103/physreva.55.1276

Cited by 30 publications

(30 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For both linear quadrupole and Paul traps pronounced radial stratification was demonstrated with lower m/z ions dominated near quadrupole axis and the trap centre, similar to what was observed experimentally in Penning trap [7,12] and in linear Paul trap [11]. For linear qudrupole separation of ions according to their m/z was also found in z-direction (along quadrupole axis).…”

Section: Stratification In An Ion Trapsupporting

confidence: 61%

Forms and oscillations modes of ion cloud in the linear RF-only quadrupole traps and in ion traps

Vedenov¹,

Nikolaev²

2002

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Computer modelling of space configurations of ion clouds consisting of different m/z ions and dynamics of their motion in the presence of external(dipolar and quadrupolar) RF-field were analysed. Forms of ion clouds in ion traps were obtained by molecular modelling. It was shown that stratification of different m/z ions appears as a result of interaction of ion clouds with RF fields and with each other. For ions with high charge qt=30 e electron and mass ni=30 000 m proton (electrosprayed protein ions in ion guides and ion traps) at ion densities -108 cm 3 stratification takes place even at room temperatures. Coalescence of ion resonance frequencies for light and heavy equally charged ions in Paul ion trap was also demonstrated.

show abstract

Section: Stratification In An Ion Trapsupporting

confidence: 61%

Forms and oscillations modes of ion cloud in the linear RF-only quadrupole traps and in ion traps

Vedenov¹,

Nikolaev²

2002

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Centrifugal separation of two-species ion plasmas has been observed and studied in 9 Be+-Hg+ [24], 9 Be+-26 Mg+ [26], 9 Be+-Cd+ [27], and 9 Be+-136Xeq+ (32< q < 44) [28] plasmas. In these experiments, laser-cooling of one ion species resulted in temperatures of less than -1 K for the other ion species.…”

Section: Positron Temperature Estimatementioning

confidence: 99%

A laser-cooled, high density positron plasma

Jelenković¹,

Newbury²,

Bollinger³

et al. 2002

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. We present results on trapping and cooling of positrons in a Penning trap. Up to a few thousand positrons are trapped and sympathetically cooled through Coulomb collisions (sympathetic cooling) with laser-cooled 9 Be+ ions. By imaging the 9Be+ laser-induced fluorescence, we observe centrifugal separation of the 9Be+ ions and the positrons, with the positrons coalescing into a column along the trap axis. This indicates the positrons have the same rotation frequency and comparable density (-4 x 109 cm-3 ) as the 9 Be+ ions, and places an upper limit of approximately 5 K on the positron temperature of motion parallel to the magnetic field. The measured positron lifetime is > 8 days in our room temperature vacuum of 10-8 Pa.

show abstract

“…Thus, the positron plasma will experience E×B rotation around the magnetic field lines with a constant angular frequency of n e e/2 0 B. Any ions present in the plasma will, in equilibrium, co-rotate with this frequency, and as a result will centrifugally separate from the positrons [54,55] systems [56,57], and also in the Be + -positron case [58]. More recently, centrifugally separated electron-antiproton systems have been observed [59,60].…”

Section: Data and Analysismentioning

confidence: 99%

Further evidence for low-energy protonium production in vacuum

et al. 2012

View full text Add to dashboard Cite

Abstract.We describe an experiment performed in the ATHENA apparatus in which there is evidence that the antiproton-proton bound state, protonium, has been produced at very low energies in vacuum following the interaction of cold antiprotons with a trapped cloud of molecular hydrogen ions. The latter were confined in a centrifugally separated belt outside a positron plasma used for antihydrogen formation. Studies have been performed at low positron plasma temperatures in which the protonium annihilation signal has been identified along with that from antihydrogen, and we discuss how their contributions can be disentangled. With the positron plasma heated to around 10000 K the ions become distributed in the positrons, and the majority of the annihilation signal can be explained in terms of protonium formation, as antihydrogen creation is heavily suppressed. In this case we compare the observed protonium formation rate with expectations from theory and find reasonable accord, when experimental systematics are taken into account. The effect on the annihilation signals of the passage of an electron current through a pre-loaded positron plasma has been studied in detail, and the results are presented here for the first time.

show abstract

Spatial separation of ion clouds between sympathetically laser-cooledCd+-ion isotopes in a Penning trap

Cited by 30 publications

References 12 publications

Forms and oscillations modes of ion cloud in the linear RF-only quadrupole traps and in ion traps

Forms and oscillations modes of ion cloud in the linear RF-only quadrupole traps and in ion traps

A laser-cooled, high density positron plasma

Further evidence for low-energy protonium production in vacuum

Contact Info

Product

Resources

About