Fueling and heating of tandem mirror end cells using rf at the ion-cyclotron frequency

Golovato, S.; Breun, R.; Ferron, J. R.; Goulding, R. H.; Hershkowitz, N.; Horne, S.; Yujiri, L.

doi:10.1063/1.865085

Cited by 25 publications

(20 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The basic idea of transverse heating of charged particles through cyclotron resonance is well known and has been studied extensively in labora tory plasmas (Hooke and Rothman, 1964; Eldridge, 1972;Golovato et al, 1985; and references therein). However, in most laboratory applications, the charged particles are generally heated by a narrow band of cyclotron waves at specific locations within a confinement device.…”

Section: Broad Band Electromagnetic Ion Cyclotron (Emic) Resonance Hementioning

confidence: 99%

Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left‐hand polarized waves

Chang¹,

Crew²,

Hershkowitz

et al. 1986

Geophysical Research Letters

Self Cite

250

202

View full text Add to dashboard Cite

Central plasma sheet (CPS) ion conies are oxygen dominated with peak energies ranging from tens to hundreds of eV centered around pitch‐angles between 115 and 130 degrees. Because of the lack of correlation between the CPS conics and the observed currents and/or electron beam‐like structures, it is not likely that all of these conies are generated by interactions with electrostatic ion cyclotron waves or lower hybrid waves. Instead, we suggest that the observed intense broad band electric field fluctuations in the frequency range between zero and a hundred Hz can be responsible for the transverse energization of the ions through cyclotron resonance heating with the left‐hand polarized electromagnetic waves. This process is much more efficient for heating the oxygen ions than hydrogen ions, thus providing a plausible explanation of the oxygen dominance in CPS conies. Simple algebraic expressions are given from which estimates of conic energy and pitch angle can be easily calculated. This suggested mechanism can also provide some preheating of the oxygen ions in the boundary plasma sheet (BPS) where discrete aurorae form.

show abstract

Section: Broad Band Electromagnetic Ion Cyclotron (Emic) Resonance Hementioning

confidence: 99%

Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left‐hand polarized waves

Chang¹,

Crew²,

Hershkowitz

et al. 1986

Geophysical Research Letters

Self Cite

250

202

View full text Add to dashboard Cite

show abstract

“…These energetic particle fluxes are coincident with intense, low-frequency auroral-zone turbulence, 7 and it has been suggested 8 that wave-particle interaction with this turbulence is responsible for the transverse acceleration of the ions to form the observed conies. Based on the laboratory study of transverse heating of ions through cyclotron resonance, 9 Chang et a/. 8 found that if the turbulence contained a modest fraction of lefthand-polarized waves, then its observed amplitude could easily account for the energies of the measured conies, making this even an ideal one for our detailed scrutiny.…”

mentioning

confidence: 98%

Monte Carlo modeling of ionospheric oxygen acceleration by cyclotron resonance with broad-band electromagnetic turbulence

et al. 1987

View full text Add to dashboard Cite

We demonstrate that cyclotron resonance with observed electric field fluctuations is responsible for production of the oxygen-ion conies that are observed by the Dynamics Explorer 1 satellite in the central plasma-sheet region of the Earth's magnetosphere. The ion-velocity distribution is described by a quasilinear diffusion equation which is solved by the Monte Carlo technique. The acceleration produced by the observed wave spectrum agrees well with the ion observations, in both form and magnitude. To our knowledge, this represents the first successful comparison of an observed conic with any theoretical model. 52.50.Gj, 52.65.+Z, 94.20.Rr Ion acceleration through wave-particle interaction with plasma turbulence in the auroral regions of the Earth's magnetosphere has commonly been invoked 1 to explain the origin of observed 2 intense fluxes of energetic ions flowing out of the ionosphere into the outer magnetosphere, which are known as "ion conies" because of the form of the ion distribution in velocity space. Until recently, 3 however, attempts to verify the theories by correlating ion-flux and plasma-turbulence data have been unsuccessful 4 : Because of the small spatial scale of energetic conies and the regions in which they form, it has proven difficult to observe simultaneously both an ion conic and the waves which are responsible for its generation. By the examination of a special class of conic events, namely, the oxygen-dominated, less-energetic conies produced in the broad central plasma-sheet (CPS) region of the auroral zone, we are able to report here the first successful description of an observed ion conic by a theoretical model of ion acceleration through waveparticle interaction. The theoretical ion-velocity distribution is calculated with use of a Monte Carlo technique which allows us to compare not only the overall magnitude of the acceleration produced by the observed turbulence, but also to compare the form of the ion-velocity distribution produced by the wave-particle interaction combined with the effect of the static, but inhomogenei ous, geomagnetic field.Such comparisons can be realized only where it is possible to measure the plasma turbulence and ion fluxes simultaneously.Intense, broad-band, low-frequency, electric and magnetic field noise has been commonly observed at low altitudes over the Earth's auroral zone by nearly all the satellites that have flown in this region. 5 Particle measurements 6 performed on board the Dynamics Explorer 1 (DE-1) satellite have revealed the existence of a population of oxygen-dominated ion conies that extend in latitude throughout the equatorward portion of the auroral zone (which maps out to the CPS in the Earth's magnetotail) during times of magnetic storm activity. These energetic particle fluxes are coincident with intense, low-frequency auroral-zone turbulence, 7 and it has been suggested 8 that wave-particle interaction with this turbulence is responsible for the transverse acceleration of the ions to form the observed conies. Based on the lab...

show abstract

“…Ion cyclotron resonance heating, ICRH, has been used on many magnetic confinement experiments 27 ' 28 -29 ' 30 ' 3132 ' 33 ' 34,35 , with varied results. This technique is used to add energy to the ions by creating a electric field rotating at a frequency near the cyclotron frequency in the plasma.…”

Section: Description Of Icrh Systemmentioning

confidence: 99%

Measurements of radial profiles of ion cyclotron resonance heating on the Tandem Mirror Experiment-Upgrade

Falabella¹

1988

View full text Add to dashboard Cite

A small Radial Energy Analyzer (REA) was used on the Tandem Mirror Experiment-Upgrade (TMX-U), at Lawrence Livermore National Laboratory, to investigate the radial profiles of ion temperature, density, and plasma potential during Ion Cyclotron Resonance Heating (ICRH). The probe has been inserted into the central-cell plasma at temperatures of 200 eV and densities of 3 x 10 I2 cm' 3 without damage to the probe, or major degradation of the plasma. This analyzer has indicated an increase in ion temperature from near 20 eV before ICRH to near 150 eV during ICRH, with about 60 kW of broadcast power. The REA measurements were cross-checked against other diagnostics on TMX-U and found to be consistent. The ion density measurement was compared to the line-density measured by microwave interferometry and found to agree within 10 to 20%. A radial integral of n;T; as measured by the REA shows good agreement with the diamagnetic loop measurement of plasma energy. The radial density profile is 7 Radial Profiles 93 7.1 Plasma Conditions for Radial Measurements 94

show abstract

Fueling and heating of tandem mirror end cells using rf at the ion-cyclotron frequency

Cited by 25 publications

References 16 publications

Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left‐hand polarized waves

Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left‐hand polarized waves

Monte Carlo modeling of ionospheric oxygen acceleration by cyclotron resonance with broad-band electromagnetic turbulence

Measurements of radial profiles of ion cyclotron resonance heating on the Tandem Mirror Experiment-Upgrade

Contact Info

Product

Resources

About