Ion cyclotron resonance is a phenomenon related to the movement of ions in a magnetic field. It is used for accelerating ions in a cyclotron, and for measuring the masses of an ionized analyte in mass spectrometry, particularly with Fourier transform ion cyclotron resonance mass spectrometers. It can also be used to follow the kinetics of chemical reactions in a dilute gas mixture, provided these involve charged species.
Definition of the resonant frequency
editAn ion in a static and uniform magnetic field will move in a circle due to the Lorentz force. The angular frequency of this cyclotron motion for a given magnetic field strength B is given by
where z is the number of positive or negative charges of the ion, e is the elementary charge and m is the mass of the ion.[1] An electric excitation signal having a frequency f will therefore resonate with ions having a mass-to-charge ratio m/z given by
The circular motion may be superimposed with a uniform axial motion, resulting in a helix, or with a uniform motion perpendicular to the field (e.g., in the presence of an electrical or gravitational field) resulting in a cycloid.
Ion cyclotron resonance heating
editIon cyclotron resonance heating (or ICRH) is a technique in which electromagnetic waves with frequencies corresponding to the ion cyclotron frequency is used to heat up a plasma.[2] The ions in the plasma absorb the electromagnetic radiation and as a result of this, increase in kinetic energy. This technique is commonly used in the heating of tokamak plasmas.[3][4][5][6]
In the solar wind
editOn March 8, 2013, NASA released an article according to which ion cyclotron waves were identified by its solar probe spacecraft called WIND as the main cause for the heating of the solar wind as it rises from the Sun's surface. Before this discovery, it was unclear why the solar wind particles would heat up instead of cool down, when speeding away from the Sun's surface.[7]
See also
editReferences
edit- ^ In SI units, the elementary charge e has the value 1.602×10−19 C, the mass of the ion m is often given in unified atomic mass unit or dalton: 1 u = 1 Da ≈ 1.660539040(20) × 10−27 kg, the magnetic field B is measured in teslas, and the angular frequency ω is measured in radians per second.
- ^ "ICRH". www.ipp.mpg.de. Retrieved 2020-06-19.
- ^ Start, D. F. H.; Jacquinot, J.; Bergeaud, V.; Bhatnagar, V. P.; Cottrell, G. A.; Clement, S.; Eriksson, L-G.; Fasoli, A.; Gondhalekar, A.; Gormezano, C.; Grosshoeg, G. (1998). "D-T Fusion with Ion Cyclotron Resonance Heating in the JET Tokamak". Physical Review Letters. 80 (21): 4681–4684. Bibcode:1998PhRvL..80.4681S. doi:10.1103/PhysRevLett.80.4681.
- ^ Bécoulet, M.; Colas, L.; Pécoul, S.; Gunn, J.; Ghendrih, Ph.; Bécoulet, A.; Heuraux, S. (2002). "Edge plasma density convection during ion cyclotron resonance heating on Tore Supra". Physics of Plasmas. 9 (6): 2619–2632. Bibcode:2002PhPl....9.2619B. doi:10.1063/1.1472501. ISSN 1070-664X.
- ^ Reinke, M L; Hutchinson, I H; Rice, J E; Howard, N T; Bader, A; Wukitch, S; Lin, Y; Pace, D C; Hubbard, A; Hughes, J W; Podpaly, Y (2012). "Poloidal variation of high- Z impurity density due to hydrogen minority ion cyclotron resonance heating on Alcator C-Mod". Plasma Physics and Controlled Fusion. 54 (4): 045004. Bibcode:2012PPCF...54d5004R. doi:10.1088/0741-3335/54/4/045004. hdl:1721.1/84058. ISSN 0741-3335. S2CID 6053900.
- ^ Van Eester, D.; Lerche, E.; Ragona, R.; Messiaen, A.; Wauters, T. (2019). "Ion cyclotron resonance heating scenarios for DEMO". Nuclear Fusion. 59 (10): 106051. Bibcode:2019NucFu..59j6051V. doi:10.1088/1741-4326/ab318b. hdl:10138/324306. ISSN 0029-5515. S2CID 199118064.
- ^ "Solar Wind Energy Source Discovered - NASA Science". science.nasa.gov. Archived from the original on 2013-03-11. Retrieved 2014-01-20.