The injection of small deuterium pellets at high repetition rates up to 12× the natural edge localized mode (ELM) frequency has been used to trigger high-frequency ELMs in otherwise low natural ELM frequency H-mode deuterium discharges in the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)]. The resulting pellet-triggered ELMs result in up to 12× lower energy and particle fluxes to the divertor than the natural ELMs. The plasma global energy confinement and density are not strongly affected by the pellet perturbations. The plasma core impurity density is strongly reduced with the application of the pellets. These experiments were performed with pellets injected from the low field side pellet in plasmas designed to match the ITER baseline configuration in shape and normalized operation with input heating power just above the H-mode power threshold. Nonlinear MHD simulations of the injected pellets show that destabilization of ballooning modes by a local pressure perturbation is responsible for the pellet ELM triggering. This strongly reduced ELM intensity shows promise for exploitation in ITER to control ELM size while maintaining high plasma purity and performance.
Skip Nav Destination
Article navigation
August 2013
Research Article|
August 23 2013
Reduction of edge localized mode intensity on DIII-D by on-demand triggering with high frequency pellet injection and implications for ITERa)
L. R. Baylor;
L. R. Baylor
b)
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
N. Commaux;
N. Commaux
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
T. C. Jernigan;
T. C. Jernigan
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
S. J. Meitner;
S. J. Meitner
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
S. K. Combs;
S. K. Combs
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
R. C. Isler;
R. C. Isler
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
E. A. Unterberg;
E. A. Unterberg
1
Oak Ridge National Laboratory
, PO Box 2008, Oak Ridge, Tennessee 37830-6169, USA
Search for other works by this author on:
N. H. Brooks;
N. H. Brooks
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
T. E. Evans;
T. E. Evans
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
A. W. Leonard;
A. W. Leonard
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
T. H. Osborne;
T. H. Osborne
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
P. B. Parks;
P. B. Parks
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
P. B. Snyder;
P. B. Snyder
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
E. J. Strait;
E. J. Strait
2
General Atomics
, PO Box 85608, San Diego, California 92186-5608, USA
Search for other works by this author on:
M. E. Fenstermacher;
M. E. Fenstermacher
3
Lawrence Livermore National Laboratory
, 700 East Ave, Livermore, California 94550, USA
Search for other works by this author on:
C. J. Lasnier;
C. J. Lasnier
3
Lawrence Livermore National Laboratory
, 700 East Ave, Livermore, California 94550, USA
Search for other works by this author on:
R. A. Moyer;
R. A. Moyer
4
University of California San Diego
, 9500 Gilman Dr., La Jolla, California 92093-0417, USA
Search for other works by this author on:
A. Loarte;
A. Loarte
5
ITER Organization, Route de Vinon sur Verdon
, 13115 St. Paul Lez Durance, France
Search for other works by this author on:
G. T. A. Huijsmans;
G. T. A. Huijsmans
5
ITER Organization, Route de Vinon sur Verdon
, 13115 St. Paul Lez Durance, France
Search for other works by this author on:
S. Futatani
S. Futatani
5
ITER Organization, Route de Vinon sur Verdon
, 13115 St. Paul Lez Durance, France
Search for other works by this author on:
Phys. Plasmas 20, 082513 (2013)
Article history
Received:
December 04 2012
Accepted:
April 15 2013
Citation
L. R. Baylor, N. Commaux, T. C. Jernigan, S. J. Meitner, S. K. Combs, R. C. Isler, E. A. Unterberg, N. H. Brooks, T. E. Evans, A. W. Leonard, T. H. Osborne, P. B. Parks, P. B. Snyder, E. J. Strait, M. E. Fenstermacher, C. J. Lasnier, R. A. Moyer, A. Loarte, G. T. A. Huijsmans, S. Futatani; Reduction of edge localized mode intensity on DIII-D by on-demand triggering with high frequency pellet injection and implications for ITER. Phys. Plasmas 1 August 2013; 20 (8): 082513. https://doi.org/10.1063/1.4818772
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Pay-Per-View Access
$40.00
Citing articles via
Progress toward fusion energy breakeven and gain as measured against the Lawson criterion
Samuel E. Wurzel, Scott C. Hsu
The crucial role of diagnostics in achieving ignition on the National Ignition Facility (NIF)
J. D. Kilkenny, A. Pak, et al.
Development of steady-state fusion reactor by Helical Fusion
J. Miyazawa, T. Goto