Hot Ion Mode in the Globus-M2 Spherical Tokamak

Курскиев, Г. С.; Сахаров, Н. В.; Gusev, V. K.; Минаев, В. Б.; Miroshnikov, I. V.; Petrov, Yu. V.; Telnova, A. Yu.; Bakharev, N. N.; Киселев, Е. О.; Zhiltsov, Nikita; Shchegolev, P. B.; Balachenkov, I. M.; Варфоломеев, В. И.; Voronin, A. V.; Goryainov, V. Yu.; Dyachenko, V. V.; Zhilin, E.G.; Iliasova, M.; Kavin, А.; Коновалов, А. Н.; Krikunov, S. V.; Lobanov, K.M.; Melnik, A. D.; Mineev, A. B.; Novokhatsky, A. N.; Патров, М. И.; Петров, А. В.; Ponomarenko, Anna; Skrekel, O. M.; Solovei, V.A.; Solokha, V.; Tkachenko, E. E.; Tokarev, V. A.; Tolstyakov, S. Yu.; Tukhmeneva, E. A.; Khilkevitch, E.; Хромов, Н. А.; Чернышев, Ф. В.; Shevelev, A.; Shulyat’ev, K. D.; Yashin, A. Yu.

doi:10.1134/s1063780x23600214

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…In Globus-M2 at 0.8 T, H-mode plasmas at moderate densities (⩾5 × 10 19 m −3 ) had inferred ion thermal diffusivities that were a factor of approximately five greater than neoclassical. At lower densities, the ion thermal diffusivities were close to neoclassical [4,10]. In the Globus-M2 hot ion mode plasmas, the ion thermal diffusivity was inferred to be less than neoclassical across the profile [4,10].…”

Section: Introductionmentioning

confidence: 81%

“…At lower densities, the ion thermal diffusivities were close to neoclassical [4,10]. In the Globus-M2 hot ion mode plasmas, the ion thermal diffusivity was inferred to be less than neoclassical across the profile [4,10].…”

Section: Introductionmentioning

confidence: 81%

“…Operation in a hot ion mode recently led to ion temperatures in excess of 10 keV, and which were sustained for over 20 s in KSTAR [9]. Hot ion mode plasmas were recently obtained in the Globus-M2 ST at B T = 0.9 T, in which the central ion temperature reached values up to 4 keV with central electron densities up to 8 × 10 19 m −3 [4,10]. The potential for achieving a hot ion mode in ST40 was originally predicted in [11].…”

Section: Introductionmentioning

confidence: 99%

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Isotope dependence of transport in ST40 hot ion mode plasmas

Kaye

Sertoli

Buxton

et al. 2023

Plasma Phys. Control. Fusion

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The ST40 compact, high-field spherical tokamak, operating at 2.1 T and with 1.8 MW of neutral beam heating, achieved central carbon impurity ion temperatures in excess of 10 keV, surpassing their business milestone of 100M ◦C (8.6 keV ). The high temperature discharges were in the hot ion mode, with Ti ≫ Te, and they were achieved in both hydrogen and deuterium plasmas with deuterium neutral beam injection. In order to achieve the high temperature scenarios, careful wall conditioning and scenario optimization was carried out in H0 → H+, D0 → H+, and finally in D0 → D+ plasmas. The TRANSP transport code was employed to study the dependence of confinement and transport on isotopic mass, and the conditions that led to the high measured central ion temperatures in the D0 → H+ and D0 → D+ plasmas. The kinetic profiles input into TRANSP were inferred from line- of-sight and limited radial measurements as well as consistency with a number of other experimental constraints. The TRANSP results first showed that the main species central ion temperature was only 0.5 to 1 keV lower than the measured carbon impurity temperature, and thus in the high performance plasmas also surpassed the 100M ◦C level. TRANSP also showed that while the electron thermal conduction loss was dominant, reductions in central ion transport, and an effective decoupling of the ions from the electrons, led to an increase in central ion temperatures with increasing plasma mass. In fact, the associated confinement times exhibited a strong dependence on the isotopic mass of the thermal plasma. These preliminary results are foundations for dedicated experiments with full kinetic profile measurements on ST40 in the next run campaign.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isotope dependence of transport in ST40 hot ion mode plasmas

Kaye

Sertoli

Buxton

et al. 2023

Plasma Phys. Control. Fusion

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Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Shikhovtsev,

Ivanov,

Davydenko

et al. 2024

J. Plasma Phys.

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An overview of the neutral beam injectors developed at the Budker Institute of Nuclear Physics in Novosibirsk during the last 10 years is presented. These neutral injectors are used for plasma diagnostics, heating and current drive in modern fusion devices with magnetic confinement. An arc or a radio-frequency (RF) discharge generates a plasma in the ion sources of the injectors, and a positive hydrogen or deuterium ion beam is extracted and accelerated by a multiaperture ion-optical system (IOS). The accelerated ion beam is converted into a neutral one in a gas target. The precision multiaperture IOS with spherically concave electrodes provides ballistic focusing of the neutral beam. The high-energy, high-power beam injector based on negative ions, which is currently under development, is described as well. It comprises a RF negative ion source and a wide-aperture electrostatic accelerator separated from the source by a low-energy beam transport line, thereby improving the injector reliability.

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Confinement, heating, and current drive study in Globus-M2 toward a future step of spherical tokamak program in Ioffe Institute

Kurskiev,

Minaev,

Sakharov

et al. 2024

Physics of Plasmas

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This paper highlights the most important results achieved at the spherical tokamak Globus-M2 with a high magnetic field. This paper also covers the most important topics of fusion research: thermal energy confinement in regimes with neutral beam injection, toroidal Alfvén eigenmode and correspondent fast ions confinement issues, L-H transition, turbulence suppression and edge-localized modes' behavior, experimental and theoretical study of regimes with nitrogen seeding that allow to significantly reduce thermal loads on the divertor plates, and experiments and simulations of lower hybrid current drive. The research results provide the basis for the next step toward a fusion neutron source—the development of the Globus-3 spherical tokamak.

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Hot Ion Mode in the Globus-M2 Spherical Tokamak

Cited by 9 publications

References 33 publications

Isotope dependence of transport in ST40 hot ion mode plasmas

Isotope dependence of transport in ST40 hot ion mode plasmas

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Confinement, heating, and current drive study in Globus-M2 toward a future step of spherical tokamak program in Ioffe Institute

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