Heating and stabilization by slow waves in the Tara tandem mirror

Golovato, S.; Brau, K.; Casey, J. A.; Coleman, J. W.; Gerver, M. J.; Hallock, G. A.; Horne, S.; Irby, J.; Kesner, J.; Kumazawa, R.; Lane, B.; Machuzak, J. S.; Moran, T.; Myer, R. C.; Post, R. S.; Sevillano, E.; Smith, Dave; Sullivan, J. D.; Torti, R.; Yao, Y.; Yasaka, Y.; Zielinski, J. J.

doi:10.1063/1.36687

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Integrating axially using the well profiles yielded a total central cell charge exchange loss of 40 kW. Golovato, et al 7 make a separate determination of the total charge exchange losses from the total gas input, the measured gas efficiency, and the observed endloss. Their value is 60 kW for discharges with slightly higher gas puff rate and is comparable to our more direct measurement.…”

Section: Resultsmentioning

confidence: 99%

“…As a result of the field bump, two magnetic 'wells' are formed in the central cell, each approximately half the central cell in length. Also near the same location is an ICH antenna which launches slow waves with resonances between the gas box and both ends of the central cell 7 . Neutral hydrogen gas flowing out of the gas box must pass through a nearby ICH resonance where it has a high probability of being ionized.…”

Section: Experimental Apparatusmentioning

confidence: 99%

See 1 more Smart Citation

Atomic hydrogen density measurements in the Tara tandem mirror experiment

Yao

Pócs

Mahon

et al. 1990

Physics of Fluids B: Plasma Physics

Self Cite

View full text Add to dashboard Cite

Neutral and plasma density have been measured in the north well of the central cell of the Tara tandem mirror. The electron plasma density and temperature on the magnetic axis were measured by Thomson scattering to be about 3 x 1012 cm-3 and 70 eV respectively. The corresponding axial neutral hydrogen density was found to be 1 x 10 9 cm-3 , while near the plasma edge at r = 15 cm it reached 1 x 1010 cm-3. The fill gas density at r > 22.5 cm. was ~ 10" cm-3 . Additional data from secondary electron detectors was used to estimate the radial ion temperature distribution which was found to have about the same width, 12 cm, as the plasma density. The resulting ion pressure profile is peaked compared to the electron pressure profile. Charge exchange losses in the well are found to have a maximum at a radius equal to half the e-folding distance of the plasma density and ion temperature distributions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

Atomic hydrogen density measurements in the Tara tandem mirror experiment

Yao

Pócs

Mahon

et al. 1990

Physics of Fluids B: Plasma Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, an auxiliary ion heating system for HELIX has been constructed using an extremely low frequency (ELF), 10 kHz < f < 100 kHz, generator, and various antennas. Since the beginnings of plasma physics, ion heating systems have been developed for both fusion and small-scale laboratory experiments, e.g., tokamaks [4], mirror machines [5], stellarators [6], and Q-machines [7,8]. Although ion heating through collisions with heated electrons [9] or neutral beams [10] has been used, a wave-particle resonance is typically exploited to directly heat the ions.…”

Section: Introductionmentioning

confidence: 99%

Resonant ion heating in a helicon plasma

Kline¹,

Scime²,

Balkey³

et al.

View full text Add to dashboard Cite

Interchange stabilization of a mirror plasma using radio-frequency waves below the ion cyclotron frequency

Browning

Majeski

Intrator

et al. 1988

The Physics of Fluids

View full text Add to dashboard Cite

It is demonstrated that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ωi≊0.75) can stabilize a mirror plasma against the interchange instability. A set of phased antennas in the Phaedrus-B tandem mirror central cell [Phys. Rev. Lett. 59, 206 (1987)] is used to select the rf azimuthal mode number (m). When the m=−1 mode is selected, the ponderomotive force from the left-hand polarized wave fields is sufficient to stabilize the plasma. Measurements of the rf mode number and of the wave polarization indicate strong excitation of m=−1 modes with much of the wave having a left-hand polarization.

show abstract

Heating and stabilization by slow waves in the Tara tandem mirror

Cited by 3 publications

References 0 publications

Atomic hydrogen density measurements in the Tara tandem mirror experiment

Atomic hydrogen density measurements in the Tara tandem mirror experiment

Resonant ion heating in a helicon plasma

Interchange stabilization of a mirror plasma using radio-frequency waves below the ion cyclotron frequency

Contact Info

Product

Resources

About