Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D

Hinson, E. T.; Schmitz, O.; Abrams, T.; Briesemeister, A.; Bykov, I.; Chrystal, C.; Collins, C.; Evans, T. E.; Frerichs, H.; Grierson, B. A.; Moyer, R. A.; Paz-Soldan, C.; Thomas, D.; Unterberg, E. A.; Wade, M.

doi:10.1088/1741-4326/ab7d50

Title: Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D

Abstract

Effective helium confinement time, τp*,He, and its ratio with energy confinement time, τp*,He/τE, are key metrics quantifying the suitability of fusion plasmas for a continuous burn. Comparisons in the DIII-D tokamak of discharges with suppression of edge localized modes (ELMs) by resonant magnetic field perturbations (RMPs) to the corresponding unperturbed ELMy discharges found that both of these metrics were strongly reduced, by a factor of approximately 2, after application of the RMPs. This reduction in τp*,He during RMP ELM suppression was observed in the plasma core, edge, and pumping plenum, where higher neutral helium concentration during RMPs was also measured. These findings provide evidence that future devices employing RMP ELM suppression may meet or even exceed the helium exhaust provided by the ELMs themselves, reducing helium ash, and thus maintaining high fusion gain.

Authors:

^[1]; Schmitz, O. ^[1]; Abrams, T. ^[2];

^[3]; Bykov, I. ^[4];

^[2]; Collins, C. ^[2];

^[2]; Frerichs, H. ^[1];

^[5]; Moyer, R. A. ^[4];

^[2]; Thomas, D. ^[2];

^[3]; Wade, M. ^[2]

Univ. of Wisconsin, Madison, WI (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of San Diego, San Diego, La Jolla, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:: Fri Mar 06 00:00:00 EST 2020

Research Org.:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1630115

Alternate Identifier(s):: OSTI ID: 1608498; OSTI ID: 1813259

Grant/Contract Number:: FC02-04ER54698; SC0013911; AC05-06OR23100; FG02-07ER54917; AC05-00OR22725; AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 60; Journal Issue: 5; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; helium; resonant magnetic perturbations; edge-localized modes

Citation Formats


                    Hinson, E. T., Schmitz, O., Abrams, T., Briesemeister, A., Bykov, I., Chrystal, C., Collins, C., Evans, T. E., Frerichs, H., Grierson, B. A., Moyer, R. A., Paz-Soldan, C., Thomas, D., Unterberg, E. A., and Wade, M. Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D.  United States: N. p., 2020. 
Web.  doi:10.1088/1741-4326/ab7d50.

Copy to clipboard


                    Hinson, E. T., Schmitz, O., Abrams, T., Briesemeister, A., Bykov, I., Chrystal, C., Collins, C., Evans, T. E., Frerichs, H., Grierson, B. A., Moyer, R. A., Paz-Soldan, C., Thomas, D., Unterberg, E. A., & Wade, M. Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D.  United States.  https://doi.org/10.1088/1741-4326/ab7d50

Copy to clipboard


                    Hinson, E. T., Schmitz, O., Abrams, T., Briesemeister, A., Bykov, I., Chrystal, C., Collins, C., Evans, T. E., Frerichs, H., Grierson, B. A., Moyer, R. A., Paz-Soldan, C., Thomas, D., Unterberg, E. A., and Wade, M. Fri .  
"Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D".  United States.  https://doi.org/10.1088/1741-4326/ab7d50.  https://www.osti.gov/servlets/purl/1630115.

Copy to clipboard


                    
@article{osti_1630115,

  title        = {Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D},

  author       = {Hinson, E. T. and Schmitz, O. and Abrams, T. and Briesemeister, A. and Bykov, I. and Chrystal, C. and Collins, C. and Evans, T. E. and Frerichs, H. and Grierson, B. A. and Moyer, R. A. and Paz-Soldan, C. and Thomas, D. and Unterberg, E. A. and Wade, M.},

  abstractNote = {Effective helium confinement time, τp*,He, and its ratio with energy confinement time, τp*,He/τE, are key metrics quantifying the suitability of fusion plasmas for a continuous burn. Comparisons in the DIII-D tokamak of discharges with suppression of edge localized modes (ELMs) by resonant magnetic field perturbations (RMPs) to the corresponding unperturbed ELMy discharges found that both of these metrics were strongly reduced, by a factor of approximately 2, after application of the RMPs. This reduction in τp*,He during RMP ELM suppression was observed in the plasma core, edge, and pumping plenum, where higher neutral helium concentration during RMPs was also measured. These findings provide evidence that future devices employing RMP ELM suppression may meet or even exceed the helium exhaust provided by the ELMs themselves, reducing helium ash, and thus maintaining high fusion gain.},

  doi          = {10.1088/1741-4326/ab7d50},

  journal      = {Nuclear Fusion},

  number       = 5,

  volume       = 60,

  place        = {United States},

  year         = {Fri Mar 06 00:00:00 EST 2020},

  month        = {Fri Mar 06 00:00:00 EST 2020}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1088/1741-4326/ab7d50

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 4 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Divertor retention for recycling impurities
journal, October 1992

Roth, J.; Krieger, K.; Fussmann, G.
Nuclear Fusion, Vol. 32, Issue 10
DOI: 10.1088/0029-5515/32/10/I11

An emerging understanding of H‐mode discharges in tokamaks ^*
journal, July 1993

Groebner, R. J.
Physics of Fluids B: Plasma Physics, Vol. 5, Issue 7
DOI: 10.1063/1.860770

Modeling of helium transport and exhaust in the LHD edge
journal, October 2016

Bader, A.; Kobayashi, M.; Schmitz, O.
Plasma Physics and Controlled Fusion, Vol. 58, Issue 12
DOI: 10.1088/0741-3335/58/12/124006

Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX
journal, October 1984

Wagner, F.; Fussmann, G.; Grave, T.
Physical Review Letters, Vol. 53, Issue 15
DOI: 10.1103/PhysRevLett.53.1453

Helium transport and exhaust studies in enhanced confinement regimes in DIII‐D
journal, June 1995

Wade, M. R.; Hillis, D. L.; Hogan, J. T.
Physics of Plasmas, Vol. 2, Issue 6
DOI: 10.1063/1.871489

Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da)
journal, May 2015

Grierson, B. A.; Burrell, K. H.; Nazikian, R. M.
Physics of Plasmas, Vol. 22, Issue 5
DOI: 10.1063/1.4918359

RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities
journal, January 2008

Evans, T. E.; Fenstermacher, M. E.; Moyer, R. A.
Nuclear Fusion, Vol. 48, Issue 2
DOI: 10.1088/0029-5515/48/2/024002

Helium Exhaust Studies in $H$ -Mode Discharges in the DIII-D Tokamak Using an Argon-Frosted Divertor Cryopump
journal, April 1995

Wade, M. R.; Hillis, D. L.; Hogan, J. T.
Physical Review Letters, Vol. 74, Issue 14
DOI: 10.1103/PhysRevLett.74.2702

Burn condition, helium particle confinement and exhaust efficiency
journal, October 1990

Reiter, D.; Wolf, G. H.; Kever, H.
Nuclear Fusion, Vol. 30, Issue 10
DOI: 10.1088/0029-5515/30/10/012

Design evolution and integration of the ITER in-vessel components
journal, October 2013

Martin, A.; Calcagno, B.; Chappuis, Ph.
Fusion Engineering and Design, Vol. 88, Issue 9-10
DOI: 10.1016/j.fusengdes.2013.01.004

Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004

Evans, T. E.; Moyer, R. A.; Thomas, P. R.
Physical Review Letters, Vol. 92, Issue 23
DOI: 10.1103/PhysRevLett.92.235003

Pumping characteristics of a cryopump with Ar sorbent in He and in a D ₂ /He mixture
journal, May 1995

Menon, M. M.; Laughon, G. J.; Maingi, R.
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 13, Issue 3
DOI: 10.1116/1.579784

Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak
journal, November 1982

Wagner, F.; Becker, G.; Behringer, K.
Physical Review Letters, Vol. 49, Issue 19
DOI: 10.1103/PhysRevLett.49.1408

3D vacuum magnetic field modelling of the ITER ELM control coil during standard operating scenarios
journal, August 2013

Evans, T. E.; Orlov, D. M.; Wingen, A.
Nuclear Fusion, Vol. 53, Issue 9
DOI: 10.1088/0029-5515/53/9/093029

Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas
journal, October 2018

Grierson, B. A.; Burrell, K. H.; Chrystal, C.
Review of Scientific Instruments, Vol. 89, Issue 10
DOI: 10.1063/1.5037333

Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015

Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.
Physical Review Letters, Vol. 114, Issue 10
DOI: 10.1103/PhysRevLett.114.105001

Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015

Nazikian, R.; Paz-Soldan, C.; Callen, J. D.
Physical Review Letters, Vol. 114, Issue 10
DOI: 10.1103/PhysRevLett.114.105002

Similar Records in DOE PAGES and OSTI.GOV collections:

Validation of the model for ELM suppression with 3D magnetic fields using low torque ITER baseline scenario discharges in DIII-D

Journal Article Moyer, Richard A. ; Paz-Soldan, Carlos ; Nazikian, Raffi ; ... - Physics of Plasmas

Experimore »« less
Cited by 37
https://doi.org/10.1063/1.5000276

Full Text Available
Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D

Journal Article Wade, M. R. ; Nazikian, R. ; deGrassie, John S. ; ... - Nuclear Fusion

We report recent experiments on DIII-D have increased confidence in the ability to suppress edge-localized modes (ELMs) using edge-resonant magnetic perturbations (RMPs) in ITER, including an improved physics basis for the edge response to RMPs as well as expansion of RMP ELM suppression to more ITER-like conditions. Complete ELM suppression has been achieved utilizing n = 3 RMPs in the ITER baseline scenario. In addition, RMP ELM suppression has been expanded to include plasmas with helium concentrations near 25% and the use of n = 2 RMPs. Analysis of the kinetic profile response suggests that ELM suppression is correlated withmore »« less
Cited by 68
https://doi.org/10.1088/0029-5515/55/2/023002

Full Text Available
Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D [Connection between plasma response and RMP ELM suppression in DIII-D]

Journal Article Wingen, Andreas ; Ferraro, Nathaniel M. ; Shafer, Morgan W. ; ... - Plasma Physics and Controlled Fusion

Calculations of the plasma response to applied non-axisymmetric elds in several DIII-D discharges show that predicted displacements depend strongly on the edge current density. This result is found using both a linear two- uid-MHD model (M3D-C1) and a nonlinear ideal-MHD model (VMEC). Furthermore, it is observed that the probability of a discharge to be edge localized mode (ELM)-suppressed is most closely related to the edge current density, as opposed to the pressure gradient. It is found that discharges with stronger kink-response are closer to the peeling-ballooning stability limit in ELITE simulations and eventually cross into the unstable region, causing ELMsmore »« less
Cited by 24
https://doi.org/10.1088/0741-3335/57/10/104006

Full Text Available
Suppression of type-I ELMs with reduced RMP coil set on DIII-D

Journal Article Orlov, Dmitriy M. ; Moyer, Richard A. ; Evans, Todd E. ; ... - Nuclear Fusion

Recent experiments on DIII-D have demonstrated that having a toroidally-monochromatic spectral content of edge-resonant magnetic perturbations (RMPs) is not a necessary condition for suppression of edge localized modes (ELMs). Robust ELM suppression has been reproducibly obtained on DIII-D during experiments in which various non-axisymmetric coil loops were turned off pseudo-randomly producing a variety of n=1 , n=2, and n=3 spectral contributions. It was demonstrated that RMP ELM suppression could be achieved with as few as 5 out of 12 internal coil loops (I-coils) on DIII-D at similar coil currents and with good plasma confinement. Linear MHD plasma response (M3DC1, IPEC,more »« less
Cited by 13
https://doi.org/10.1088/0029-5515/56/3/036020

Full Text Available
Effects of edge-localized electron cyclotron current drive on edge-localized mode suppression by resonant magnetic perturbations in DIII-D

Journal Article Hu, Q. M. ; Logan, N. C. ; Yu, Q. ; ... - Nuclear Fusion

Abstract According to recent DIII-D experiments (Logan et al 2024 Nucl. Fusion 64 014003), injecting edge localized electron cyclotron current drive (ECCD) in the counter-plasma-current (counter- I _p ) direction reduces the n = 3 resonant magnetic perturbation (RMP) current threshold for edge-localized mode (ELM) suppression, while co- I _p ECCD during the suppressed ELM phase causes a back transition to ELMing. This paper presents nonlinear two-fluid simulations on the ECCD manipulation of edge magnetic islands induced by RMP using the TM1 code. In the presence of a magnetic island chain at the pedestal-top, co- I _p ECCD is foundmore »« less
https://doi.org/10.1088/1741-4326/ad2ca8

Similar Records

Title: Enhanced helium exhaust during edge-localized mode suppression by resonant magnetic perturbations at DIII-D

Abstract

Citation Formats

Divertor retention for recycling impurities journal, October 1992

An emerging understanding of H‐mode discharges in tokamaks * journal, July 1993

Modeling of helium transport and exhaust in the LHD edge journal, October 2016

Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX journal, October 1984

Helium transport and exhaust studies in enhanced confinement regimes in DIII‐D journal, June 1995

Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da) journal, May 2015

RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities journal, January 2008

Helium Exhaust Studies in H -Mode Discharges in the DIII-D Tokamak Using an Argon-Frosted Divertor Cryopump journal, April 1995

Burn condition, helium particle confinement and exhaust efficiency journal, October 1990

Design evolution and integration of the ITER in-vessel components journal, October 2013

Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary journal, June 2004

Pumping characteristics of a cryopump with Ar sorbent in He and in a D 2 /He mixture journal, May 1995

Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak journal, November 1982

3D vacuum magnetic field modelling of the ITER ELM control coil during standard operating scenarios journal, August 2013

Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas journal, October 2018

Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression journal, March 2015

Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak journal, March 2015

Divertor retention for recycling impurities
journal, October 1992

An emerging understanding of H‐mode discharges in tokamaks ^*
journal, July 1993

Modeling of helium transport and exhaust in the LHD edge
journal, October 2016

Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX
journal, October 1984

Helium transport and exhaust studies in enhanced confinement regimes in DIII‐D
journal, June 1995

Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da)
journal, May 2015

RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities
journal, January 2008

Helium Exhaust Studies in $H$ -Mode Discharges in the DIII-D Tokamak Using an Argon-Frosted Divertor Cryopump
journal, April 1995

Burn condition, helium particle confinement and exhaust efficiency
journal, October 1990

Design evolution and integration of the ITER in-vessel components
journal, October 2013

Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004

Pumping characteristics of a cryopump with Ar sorbent in He and in a D ₂ /He mixture
journal, May 1995

Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak
journal, November 1982

3D vacuum magnetic field modelling of the ITER ELM control coil during standard operating scenarios
journal, August 2013

Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas
journal, October 2018

Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015

Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015