Modification of plasma rotation with resonant magnetic perturbations in the STOR-M tokamak

Elgriw, S.; Liu, Y; Hirose, Akira; Xiao, C.

doi:10.1088/0741-3335/58/4/045002

Cited by 12 publications

(5 citation statements)

References 61 publications

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“…Table 1 shows the intrinsic toroidal rotation in the plasma core of different tokamaks. In the Tokamak Chauffage Alfvén Brésilien (TCABR) tokamak, toroidal rotation measurements taken during limited Ohmic L-mode plasmas show that, as observed in other tokamaks [30][31][32], the plasma core rotates in the counter-current direction, while the plasma edge rotates in the co-current direction [33]. The measured toroidal rotation in the plasma core is approximately 20 km s −1 and is in reasonable agreement with the model proposed in [34].…”

Section: Introductionsupporting

confidence: 78%

Overview of plasma rotation studies on the TCABR tokamak

Severo¹,

Canal²,

Ronchi³

et al. 2021

Plasma Phys. Control. Fusion

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An overview of intrinsic plasma rotation studies in Ohmic L-mode discharges carried out in the Tokamak Chauffage Alfvén Brésilien (TCABR) tokamak is presented. Measurements of plasma poloidal and toroidal rotation, and a comparison against neoclassical theory, are presented. The results show that poloidal rotation is in good agreement with neoclassical theory while toroidal rotation is found to be anomalous. A new technique that allows for high temporal resolution measurements of plasma rotation is presented. This technique is used to test two models of intrinsic toroidal rotation: the so-called Helander model (Helander et al 2003 Physics of Plasmas 10 4396) and Rozhansky model (Rozhansky 2013 Perpendicular currents and electric fields in fully and partially ionized magnetized plasma Physics of Plasmas 24 101614). As TCABR is a relatively small device, the influence of the neutrals that form the basis of this model is expected to be enhanced. The results indicate that the mechanism proposed by Helander does not contribute significantly to the intrinsic toroidal rotation in TCABR plasmas. The measurements, however, indicate that the frictional force proposed by Rozhansky might be responsible for part of the intrinsic toroidal rotation observed in TCABR plasmas.

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Section: Introductionsupporting

confidence: 78%

Overview of plasma rotation studies on the TCABR tokamak

Severo¹,

Canal²,

Ronchi³

et al. 2021

Plasma Phys. Control. Fusion

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“…Suppression of the m = 2 MHD mode and transition to improved plasma confinement (H-mode) after tangential CTI have been observed [7]. It has also been recently found that the toroidal flow velocity can be modified by tangential CTI [5] and RMP fields [11] along with suppression of MHD fluctuations. In both RMP and tangential CTI cases, the change of the toroidal flow velocity was in the counter-clockwise (CCW, top view) direction, coincide with both CT injection direction and the plasma current direction.…”

Section: Introductionmentioning

confidence: 90%

“…As expected, the intrinsic flow velocity direction was reversed by changing the direction of plasma discharge current. Since the RMP field is no longer resonant with the magnetic island due to the change of the plasma current direction, non-resonant RMP induced a much smaller modification of toroidal flow velocity towards the co-current direction (now CW direction) [11].…”

Section: Introductionmentioning

confidence: 99%

Modification of toroidal flow velocity through momentum Injection by compact torus injection into the STOR-M tokamak

et al. 2017

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In the Saskatchewan torus-modified (STOR-M) tokamak, tangential compact torus injection (CTI) experiments have been performed with normal (counter-clockwise, CCW, top view) and reversed (clockwise, CW, top view) plasma current directions while the compact torus (CT) injection direction remains in the CCW direction. The intrinsic toroidal flow direction reverses when the discharge current is reversed. However, the change in the toroidal flow direction is always toward the CTI direction (CCW). It has been determined that the momentum in high density and high velocity CT is more than ten times larger than the intrinsic toroidal rotation momentum in the typical STOR-M plasma. Therefore, the modification of the plasma toroidal rotation velocity is attributed to momentum transfer from CT to the tokamak discharge.

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“…The Saskatchewan Torus-Modified tokamak observes that the toroidal flow velocities of oxygen V and carbon VI impurity ions change towards the co-current direction after the application of m/n=2/1 RMP field coils. It has been observed that the reduction of the toroidal flow velocity is closely correlated to the reduction of the mode frequency measured by Mirnov coils [14].…”

Section: Introductionmentioning

confidence: 68%

“…Plasma rotation has a relationship between mode frequency and electron diamagnetic drift frequency. Mode locking is also likely to happen at a lower mode frequency and the threshold for mode locking has a linear relation with mode frequency [14]. The core and edge rotations response to the mode frequency need to be investigated, too.…”

Section: Discussionmentioning

confidence: 99%

Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak

Yan

Chen

Huang

et al. 2018

Plasma Phys. Control. Fusion

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The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s−1 in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.

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Modification of plasma rotation with resonant magnetic perturbations in the STOR-M tokamak

Cited by 12 publications

References 61 publications

Overview of plasma rotation studies on the TCABR tokamak

Overview of plasma rotation studies on the TCABR tokamak

Modification of toroidal flow velocity through momentum Injection by compact torus injection into the STOR-M tokamak

Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak

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