Toroidal plasma acceleration due to NBI fast ion losses in LTX-β

Hughes, P. E.; Capecchi, W.; Elliott, D. B.; Zakharov, L. E.; Bell, R. E.; Hansen, C.; Boyle, D. P.; Gorelenkov, S. N.; Majeski, R.; Kaita, R.

doi:10.1088/1361-6587/ac0b9f

Title: Toroidal plasma acceleration due to NBI fast ion losses in LTX-β

Journal Article · Mon Jul 05 00:00:00 EDT 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac0b9f· OSTI ID:1807662

^[1]; Capecchi, W. ^[2];

^[3]; Zakharov, L. E. ^[4];

^[1];

^[5];

^[1]; Gorelenkov, S. N. ^[1]; Majeski, R. ^[1]; Kaita, R. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Wisconsin, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lithium Wall Fusion, Princeton, NJ (United States)
Univ. of Washington, Seattle, WA (United States)

The recent Lithium Tokamak Experiment-Beta (LTX-β) upgrade includes the addition of neutral beam injection (NBI) in the same direction as the plasma current (co-I_P) and a new toroidal Mirnov array for MHD characterization. In initial NBI experiments, a spontaneously rotating n = 1 MHD mode is seen to accelerate during NBI in the counter-beam direction, accompanied by a rise in electron density consistent with the beam-injected inventory but without a clear increase in plasma pressure. Together with analytic and numerical modeling of beam optics and fast ion confinement, these observations indicate the prompt loss of all or nearly all beam ions. However, the same modeling also suggests that planned upgrades to the Ohmic heating system should provide the fast ion confinement necessary for beam heating and core fueling. Here, a simple analytic model relates the momentum confinement time τ_Φ to the observed evolution of mode rotation due to the combination of NBI momentum coupling, fast ion loss $$\vec{J}\times\vec{B}$$, and anomalous viscous torques, yielding τ_Φ values consistent with past measurements of electron energy confinement time τ_E,e.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; SC0019239

OSTI ID:: 1807662

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 63, Issue 8; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (26)

Compatibility of lithium plasma-facing surfaces with high edge temperatures in the Lithium Tokamak Experiment Majeski, R.; Bell, R. E.; Boyle, D. P. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4977916	journal	May 2017
The confinement of dilute populations of beam ions in the national spherical torus experiment Heidbrink, W. W.; Miah, M.; Darrow, D. Nuclear Fusion, Vol. 43, Issue 9 https://doi.org/10.1088/0029-5515/43/9/312	journal	August 2003
Time evolution of mass flows in a collisional tokamak Hassam, Adil B.; Kulsrud, Russell M. Physics of Fluids, Vol. 21, Issue 12 https://doi.org/10.1063/1.862166	journal	January 1978
On a burning plasma low recycling regime with P _DT = 23–26 MW, Q _DT = 5–7 in a JET-like tokamak Zakharov, Leonid E. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab246b	journal	July 2019
Rotation driven by fast ions in tokamaks Thyagaraja, A.; Schwander, F.; McClements, K. G. Physics of Plasmas, Vol. 14, Issue 11 https://doi.org/10.1063/1.2801716	journal	November 2007
Toroidal Plasma Rotation in the Princeton Large Torus Induced by Neutral-Beam Injection Suckewer, S.; Eubank, H. P.; Goldston, R. J. Physical Review Letters, Vol. 43, Issue 3 https://doi.org/10.1103/PhysRevLett.43.207	journal	July 1979
Heating of toroidal plasmas by neutral injection Stix, T. H. Plasma Physics, Vol. 14, Issue 4 https://doi.org/10.1088/0032-1028/14/4/002	journal	April 1972
Deuterium retention in liquid lithium Baldwin, M. J.; Doerner, R. P.; Luckhardt, S. C. Nuclear Fusion, Vol. 42, Issue 11 https://doi.org/10.1088/0029-5515/42/11/305	journal	October 2002
Discrepancy between estimated and measured fusion product rates on MAST using TRANSP/NUBEAM Cecconello, M.; Boeglin, W.; Keeling, D. Nuclear Fusion, Vol. 59, Issue 1 https://doi.org/10.1088/1741-4326/aaea19	journal	November 2018
Hydromagnetic stability of tokamaks Wesson, J. A. Nuclear Fusion, Vol. 18, Issue 1 https://doi.org/10.1088/0029-5515/18/1/010	journal	January 1978
Initial Results From the Newly Upgraded LTX- β Elliott, Drew; Anderson, Jay; Bell, Ronald E. IEEE Transactions on Plasma Science, Vol. 48, Issue 6 https://doi.org/10.1109/TPS.2020.2983854	journal	June 2020
Neutral beam heating in the START spherical tokamak Akers, R. J.; Appel, L. C.; Carolan, P. G. Nuclear Fusion, Vol. 42, Issue 2 https://doi.org/10.1088/0029-5515/42/2/302	journal	February 2002
Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment Hansen, C.; Boyle, D. P.; Schmitt, J. C. Physics of Plasmas, Vol. 24, Issue 4 https://doi.org/10.1063/1.4981214	journal	April 2017
Spontaneous rotation and momentum transport in tokamak plasmas Rice, J. E. Journal of Physics: Conference Series, Vol. 123 https://doi.org/10.1088/1742-6596/123/1/012003	journal	July 2008
Plasma rotation under a driven radial current in a tokamak Chang, C. S. Nuclear Fusion, Vol. 39, Issue 11Y https://doi.org/10.1088/0029-5515/39/11Y/362	journal	November 1999
Analysis of fast-ion D _α data from the National Spherical Torus Experiment Heidbrink, W. W.; Ruskov, E.; Liu, D. Nuclear Fusion, Vol. 56, Issue 5 https://doi.org/10.1088/0029-5515/56/5/056005	journal	April 2016
Collective electric field effects on the confinement of fast ions in tokamaks McClements, K. G.; Thyagaraja, A. Physics of Plasmas, Vol. 13, Issue 4 https://doi.org/10.1063/1.2188401	journal	April 2006
Numerical analysis of the effect of fast-ion losses on plasma rotation in a tokamak with toroidal field ripple Honda, M.; Takizuka, T.; Fukuyama, A. Nuclear Fusion, Vol. 48, Issue 8 https://doi.org/10.1088/0029-5515/48/8/085003	journal	July 2008
On lithium walls and the performance of magnetic fusion devices Krasheninnikov, S. I.; Zakharov, L. E.; Pereverzev, G. V. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1558293	journal	May 2003
Observation of Flat Electron Temperature Profiles in the Lithium Tokamak Experiment Boyle, D. P.; Majeski, R.; Schmitt, J. C. Physical Review Letters, Vol. 119, Issue 1 https://doi.org/10.1103/PhysRevLett.119.015001	journal	July 2017
Low Recycling Divertor for JET Burning Plasma Regime ($P_{\mathrm{DT}}$ > 25 MW, $Q_{\mathrm{DT}}$ > 5), Insensitive to Plasma Physics Zakharov, Leonid E.; Allain, Jean Paul; Bennett, Samuel X. IEEE Transactions on Plasma Science, Vol. 48, Issue 6 https://doi.org/10.1109/TPS.2019.2953591	journal	June 2020
The role of rotation in tokamak internal transport barriers Staebler, G. M.; Waltz, R. E.; Wiley, J. C. Nuclear Fusion, Vol. 37, Issue 3 https://doi.org/10.1088/0029-5515/37/3/I01	journal	March 1997
Magnetic perturbation diagnostics in the high-temperature lithiated environment of LTX- β Hughes, P. E.; Majeski, R.; Kaita, R. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035359	journal	October 2018
Prompt toroidal momentum balance with collisionless neutral beam injected torque in DIII-D deGrassie, J. S.; Groebner, R. J.; Burrell, K. H. Physics of Plasmas, Vol. 13, Issue 11 https://doi.org/10.1063/1.2374862	journal	November 2006
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library Pankin, Alexei; McCune, Douglas; Andre, Robert Computer Physics Communications, Vol. 159, Issue 3 https://doi.org/10.1016/j.cpc.2003.11.002	journal	June 2004
Sustained Stabilization of the Resistive-Wall Mode by Plasma Rotation in the DIII-D Tokamak Garofalo, A. M.; Strait, E. J.; Johnson, L. C. Physical Review Letters, Vol. 89, Issue 23 https://doi.org/10.1103/PhysRevLett.89.235001	journal	November 2002

Similar Records

Neutral beam prompt loss in LTX-β

Journal Article · Fri Oct 22 00:00:00 EDT 2021 · Nuclear Fusion · OSTI ID:1807662

Capecchi, W.; Anderson, J. K.; Boyle, D. P.; +5 more

Investigation of mode activity in NBI-heated experiments of Wendelstein 7-X

Journal Article · Tue Aug 25 00:00:00 EDT 2020 · Nuclear Fusion · OSTI ID:1807662

Slaby, C.; Äkäslompolo, Simppa; Borchardt, M.; +20 more

Investigating the role of edge neutrals in exciting tearing mode activity and achieving flat temperature profiles in LTX-β

Journal Article · Fri Mar 08 00:00:00 EST 2024 · Nuclear Fusion · OSTI ID:1807662

Banerjee, Santanu; Boyle, D. P.; Maan, A.; +8 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Title: Toroidal plasma acceleration due to NBI fast ion losses in LTX-β

Citation Formats

References (26)

Similar Records

Related Subjects