Main Magnetic Focus Ion Source (MaMFIS) is a compact ion source with extremely high electron current density. The device is designed for production of ions of arbitrary elements in any charge states, in particular, of highly charged ions of heavy elements.[1][2][3]
Operation
editAtomic ions are produced and confined in the local ion traps formed in crossovers of a rippled electron beam propagating in a drift tube. The electron beam is focused by a thick magnetic lens. In a sharp crossover, the electron current density can reach values, which significantly exceed that for the Brillouin focusing of laminar flow of electrons.[4] The extraction of ions from the ion source can be realized in both axial and radial directions. Without the ion extraction, the MaMFIS is called the Main Magnetic Focus Ion Trap (MaMFIT) and serves as a source of characteristic radiation. The devices operate at room temperature due to the use of permanent magnets and standard vacuum techniques.
Applications
editThe MaMFIS can be employed as a tool for fundamental investigations in microplasma physics, surface physics, and atomic physics[5][6][7][8] (e.g., for spectroscopy measurements, study of parity nonconservation in highly charged ions and search for variation of fundamental constants), as well as for technological applications (e.g., in single ion implantation and ion-beam lithography).
A very promising application of the ion source is the charge breeding of short-lived radioactive isotopes. The deep ionization of electron shells allows one to eliminate the conversion decay channels, so that the life-time of nucleus can be increased by many orders of magnitude. In this case, the use of mass spectrometry become feasible. The extremely high electron current density realized in the MaMFIS results in very short ionization times and efficient production of highly charged ions of heavy elements.
References
edit- ^ Ovsyannikov, V.P.; Nefiodov, A.V. (2016). "Main magnetic focus ion source with the radial extraction of ions". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 367: 1–7. doi:10.1016/j.nimb.2015.11.015. ISSN 0168-583X.
- ^ Ovsyannikov, V.P.; Nefiodov, A.V. (2016). "Main magnetic focus ion source: Basic principles, theoretical predictions and experimental confirmations". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 370: 32–41. doi:10.1016/j.nimb.2016.01.001. ISSN 0168-583X.
- ^ Ovsyannikov, V. P.; Nefiodov, A. V.; Levin, A. A. (2017). "Universal main magnetic focus ion source: A new tool for laboratory research of astrophysics and Tokamak microplasma". Journal of Physics: Conference Series. 798 (1): 012170. doi:10.1088/1742-6596/798/1/012170. ISSN 1742-6596.
- ^ Brillouin L., A theorem of Larmor and its importance for electrons in magnetic fields, Physical Review, 67, p. 260 (1945) DOI: 10.1103/PhysRev.67.260
- ^ Micke, P.; Kühn, S.; Buchauer, L.; Harries, J. R.; Bücking, T. M.; Blaum, K.; Cieluch, A.; Egl, A.; Hollain, D. (2018). "The Heidelberg compact electron beam ion traps". Review of Scientific Instruments. 89 (6): 063109. doi:10.1063/1.5026961. ISSN 0034-6748.
- ^ Bondarevskaya, A A; Chubukov, D V; Mistonova, E A; Lyashchenko, K N; Andreev, O Yu; Surzhykov, A; Labzowsky, L N; Plunien, G; Liesen, D (2018). "Considerations towards the possibility of the observation of parity nonconservation in highly charged ions in storage rings". Physica Scripta. 93 (2): 025401. doi:10.1088/1402-4896/aa9692. ISSN 0031-8949.
- ^ Kozlov, M. G.; Safronova, M. S.; Crespo López-Urrutia, J. R.; Schmidt, P. O. (2018). "Highly charged ions: Optical clocks and applications in fundamental physics". Reviews of Modern Physics. 90 (4): 045005. doi:10.1103/RevModPhys.90.045005.
- ^ Safronova, Marianna S. "The Search for Variation of Fundamental Constants with Clocks". Annalen der Physik. 0 (0): 1800364. doi:10.1002/andp.201800364. ISSN 1521-3889.