Isorotation and differential rotation in a magnetic mirror with imposed E×B rotation

Romero-Talamás, C.A.; Elton, R. C.; Young, W. C.; Reid, Remington; Ellis, R. F.

doi:10.1063/1.4731729

Cited by 5 publications

(8 citation statements)

References 23 publications

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“…This is different from the CMFX approach, which has insulating end plates and a central conductor. Because the total potential drop and the boundary conditions are fixed, diffusive transport smooths the voltage into a singly peaked profile (Huang & Hassam 2001;Romero-Talamás et al 2012). While experiments like GDT and C-2W do use some amount of biasing to create shear-flow stabilization, centrifugal mirrors impose much higher voltages to achieve improved confinement.…”

Section: Physics Modelmentioning

confidence: 99%

“…The central conductor is biased by a large voltage from a capacitor bank, and a large radial electric field generates supersonic E × B flows. The potential drop from the centre electrode to the grounded ring electrodes is held fixed, and it has been shown previously that the velocity and temperature profiles across the radial width of the plasma are approximately parabolic (Huang & Hassam 2001;Romero-Talamás et al 2012). We take the transverse length scale a to be half the width, whereas the parallel length scale L is the axial extent of the plasma.…”

Section: Physics Modelmentioning

confidence: 99%

“…In contrast, a singly peaked profile (as has been achieved with a centre conductor (Huang & Hassam 2001; Romero-Talamás et al. 2012)) and sufficiently large rotational shear, can stabilize centrifugally confined plasmas in the absence of line-tying. Ryutov et al.…”

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confidence: 98%

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MCTrans++: a 0-D model for centrifugal mirrors

Schwartz,

Abel,

Hassam

et al. 2024

J. Plasma Phys.

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The centrifugal mirror confinement scheme incorporates supersonic rotation of a plasma into a magnetic mirror device. This concept has been shown experimentally to drastically decrease parallel losses and increase plasma stability as compared with prior axisymmetric mirrors. MCTrans++ is a dimensionless (0-D) scoping tool which rapidly models experimental operating points in the Centrifugal Mirror Fusion Experiment (CMFX) at the University of Maryland. In the low-collisionality regime, parallel losses can be modelled analytically. A confining potential is set up that is partially ambipolar and partially centrifugal. Due to the stabilizing effects of flow shear, the perpendicular losses can be modelled as classical. Radiation losses such as bremsstrahlung and cyclotron emission are taken into account. A neutrals model is included, and, in some circumstances, charge-exchange losses are found to exceed all other loss mechanisms. We use the SUNDIALS ARKODE library to solve the underlying equations of this model; the resulting software is suitable for scanning large parameter spaces, and can also be used to model time-dependent phenomena such as a capacitive discharge. MCTrans++ has been used to verify results from prior centrifugal mirrors, create an experimental plan for CMFX and find configurations for future reactor-scale fusion devices.

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Section: Physics Modelmentioning

confidence: 99%

Section: Physics Modelmentioning

confidence: 99%

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MCTrans++: a 0-D model for centrifugal mirrors

Schwartz,

Abel,

Hassam

et al. 2024

J. Plasma Phys.

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“…The electron temperature profile, which yields the best fit to the measured spectrum, is shown in Figure 6 together with recent measurements made of the radial ion temperature profile. 15 The corresponding cone angle was 38 . The model accurately predicts the emission spectrum over most of the observed frequency range (Fig.…”

Section: Temperature Profile Estimationmentioning

confidence: 99%

100 eV electron temperatures in the Maryland centrifugal experiment observed using electron Bernstein emission

et al. 2014

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Electron Bernstein wave electron temperature profile diagnostic (invited) Rev. Sci. Instrum. 72, 285 (2001); Thermal electron Bernstein emission has been observed at the second harmonic of the electron cyclotron frequency at the mid-plane of the Maryland Centrifugal eXperiment. The emission is received in the X-mode polarization and coupled to the Bernstein wave by the B-X mode conversion process. The average B-X coupling efficiency is approximately 20%. The observed emission indicates thermal electron temperatures an excess of 100 eV in the core of the rotating plasma. The measured electron temperature is consistent with recent ion temperature measurements and indicates that the total energy confinement time exceeds 500 ls. V C 2014 AIP Publishing LLC.

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“…This latter approach is closely related to a magnetic confinement concept known as the centrifugal mirror trap, which has applications both in nuclear fusion 2 – 9 and mass separation 2 , 10 – 13 . These devices typically consist of an approximately radial electric field superimposed on an approximately axial magnetic field, such that the resulting E × B drifts produce azimuthal rotation.…”

Section: Introductionmentioning

confidence: 99%

Massive, long-lived electrostatic potentials in a rotating mirror plasma

Kolmes,

Ochs,

Rax

et al. 2024

Nat Commun

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Hot plasma is highly conductive in the direction parallel to a magnetic field. This often means that the electrical potential will be nearly constant along any given field line. When this is the case, the cross-field voltage drops in open-field-line magnetic confinement devices are limited by the tolerances of the solid materials wherever the field lines impinge on the plasma-facing components. To circumvent this voltage limitation, it is proposed to arrange large voltage drops in the interior of a device, but coexist with much smaller drops on the boundaries. To avoid prohibitively large dissipation requires both preventing substantial drift-flow shear within flux surfaces and preventing large parallel electric fields from driving large parallel currents. It is demonstrated here that both requirements can be met simultaneously, which opens up the possibility for magnetized plasma tolerating steady-state voltage drops far larger than what might be tolerated in material media.

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Isorotation and differential rotation in a magnetic mirror with imposed E×B rotation

Cited by 5 publications

References 23 publications

MCTrans++: a 0-D model for centrifugal mirrors

MCTrans++: a 0-D model for centrifugal mirrors

100 eV electron temperatures in the Maryland centrifugal experiment observed using electron Bernstein emission

Massive, long-lived electrostatic potentials in a rotating mirror plasma

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