Behavior of high energy ions in the GAMMA 10 tandem mirror

Ichimura, M.; Satake, Chikako; Sakata, Kaoru; Furukawa, Shinya; Nakamura, M.; Saito, T.; Tanaka, Satoru; Kanazawa, S.; Ishikawa, Eiji; Takayama, S.; Motegi, S.; Saosaki, S.; Nakashima, Y.; Hōjō, H.; Tamano, T.; Yatsu, K.

doi:10.1063/1.1149491

Cited by 13 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6 shows the signal of ccHED ͑central cell high-energy ion detector͒ installed at the midplane. 17 The ccHED is set just outside the limiter radius and can detect the ions of which energy is above 10 keV. When the RF3 pulse is applied, the signal of high-energy ions increases with the RF3 power.…”

Section: B Experimental Results With High Harmonic Icrf Wavesmentioning

confidence: 99%

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

et al. 2001

Self Cite

View full text Add to dashboard Cite

539͔ by axisymmetrization of heating systems for the plasma production, heating, and potential formation. A significant increase of the density and diamagnetism by the potential confinement was observed. In the previous experiment, it was difficult to increase the central cell density higher than 2.7ϫ10 18 m Ϫ3. One of the possible mechanisms is the density clamping due to the eigenmode formation of the ion-cyclotron-range of frequency ͑ICRF͒ waves in the axial direction. With high harmonic ICRF waves ͑RF3͒, the experiments to overcome this problem have been performed. In preliminary experiments with RF3 and NBI the maximum density of 4ϫ10 18 m Ϫ3 was attained.

show abstract

Section: B Experimental Results With High Harmonic Icrf Wavesmentioning

confidence: 99%

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

et al. 2001

Self Cite

View full text Add to dashboard Cite

show abstract

“…5 and another is a central-cell high energy-ion detector, ccHED, of which configuration has been described in Ref. 8. A silicon surface barrier (SSB) detector (nominal depletion depth of 300 m) is used in this experiment.…”

Section: Diagnosticsmentioning

confidence: 99%

“…The plasma is seeded by short pulses of plasma guns from both ends and then raised by applying ICRF power (RF1) in combination with hydrogen gas injections near the ICRF antennas. In addition to plasma production, RF1 is used for heating ions in the minimum-B anchor cells [11]. The frequency of RF1 is selected to be a fundamental ion cyclotron resonance frequency near the midplane of the anchor cell.…”

Section: Gamma 10 Devicementioning

confidence: 99%

“…To measure the high-energy ions, two semiconductor detectors are installed in GAMMA 10. One is an east-end high-energy ion detector, eeHED, of which the configuration has been described in [6], and the other is a central-cell high-energy ion detector, ccHED, of which the configuration has been described in [11]. A silicon surface barrier (SSB) detector (nominal depletion depth of 300 µm) is used.…”

Section: Diagnosticsmentioning

confidence: 99%

See 1 more Smart Citation

Coupling of ICRF waves and axial transport of high-energy ions owing to spontaneously excited waves in the GAMMA 10 tandem mirror

Ikezoe¹,

Ichimura²,

Hirata³

et al. 2013

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

Plasmas with high ion-temperature of several keV and strong temperature anisotropy of more than 10 have been produced by using ion-cyclotron range of frequency (ICRF) heating in the GAMMA 10 tandem mirror. In such high performance plasmas with strong anisotropy, high-frequency fluctuations, so-called Alfvén-Ion-Cyclotron (AIC) waves, are spontaneously excited. The AIC waves have several discrete peaks in the frequency spectrum. Couplings between ICRF waves for heating and excited AIC waves are clearly observed in the central cell of GAMMA 10. Low frequency waves which have differential frequencies between discrete peaks of the AIC waves are also observed. Parametric decay of ICRF waves are discussed and pitch angle scattering of high-energy ions owing to those low-frequency waves are clearly detected. Energy transport along the magnetic field line is one of the important subjects when the ICRF power is injected in the perpendicular direction to magnetic field line.

show abstract

Characteristics of hot ions with strong radiofrequency heating in the GAMMA 10 tandem mirror

et al. 1999

View full text Add to dashboard Cite

Radiofrequency waves in the ion cyclotron range of frequency (ICRF) are mainly used for plasma production and heating in the central cell of the GAMMA 10 tandem mirror. GAMMA 10 has minimum-B anchor cells with a non-axisymmetric magnetic field configuration. The ICRF heating system in the central cell has been improved to create a more axisymmetric plasma. A high ion temperature is attained with the system, and high energy ions with energies of more than 50 keV are detected both parallel and perpendicular to the magnetic field lines. Strong temperature anisotropy is observed and strong Alfvén ion cyclotron (AIC) modes are excited due to the anisotropy. With the AIC modes, the number of high energy ions detected at the end of the mirror increase and the number of high energy ions with a pitch angle in the central cell of nearly 90° decrease.

show abstract

Behavior of high energy ions in the GAMMA 10 tandem mirror

Cited by 13 publications

References 4 publications

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

Coupling of ICRF waves and axial transport of high-energy ions owing to spontaneously excited waves in the GAMMA 10 tandem mirror

Characteristics of hot ions with strong radiofrequency heating in the GAMMA 10 tandem mirror

Contact Info

Product

Resources

About