Radiative detached divertor with acceptable separatrix Zeff
Abstract
The feasibility study is performed for the radiative detached divertor (RDD) concept, which characterizes a variety of detached plasmas with impurity amounts providing the highest levels of divertor radiation without X-point MARFE (XPM), based on a set of restrictive criteria for the leading plasma parameters (LPPs) including, e.g., tolerable peak power loads below 1 MW/m2, low separatrix densities, allowable impurity concentrations, and acceptable Zeff values for a DIII-D like tokamak. For this, extensive simulations with the 2-D edge plasma transport code were done scanning the deuterium and impurity inventories practically for all impurity elements from beryllium to neon and the analysis of LPP variations in these scans is presented. It is shown that, for a given D inventory, the total radiation fraction with an increase in the impurity inventory reaches a flat top level, frad = 0.85 ± 0.01, whereas the higher frad corresponds to XPM. This critical fraction is the same for all elements and values of the D inventory. Successful RDD solutions with a flat top radiation meeting all ad hoc LPP criteria are found for some elements. Boron and nitrogen are shown to be the most promising elements for seeding, since they are capable of providing alonemore »
- Authors:
-
- Univ. of California at San Diego, La Jolla, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California at San Diego, La Jolla, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1524548
- Alternate Identifier(s):
- OSTI ID: 1405217
- Grant/Contract Number:
- FG02-04ER54739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 10; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Pigarov, A. Yu. Radiative detached divertor with acceptable separatrix Zeff. United States: N. p., 2017.
Web. doi:10.1063/1.4986516.
Pigarov, A. Yu. Radiative detached divertor with acceptable separatrix Zeff. United States. https://doi.org/10.1063/1.4986516
Pigarov, A. Yu. Fri .
"Radiative detached divertor with acceptable separatrix Zeff". United States. https://doi.org/10.1063/1.4986516. https://www.osti.gov/servlets/purl/1524548.
@article{osti_1524548,
title = {Radiative detached divertor with acceptable separatrix Zeff},
author = {Pigarov, A. Yu.},
abstractNote = {The feasibility study is performed for the radiative detached divertor (RDD) concept, which characterizes a variety of detached plasmas with impurity amounts providing the highest levels of divertor radiation without X-point MARFE (XPM), based on a set of restrictive criteria for the leading plasma parameters (LPPs) including, e.g., tolerable peak power loads below 1 MW/m2, low separatrix densities, allowable impurity concentrations, and acceptable Zeff values for a DIII-D like tokamak. For this, extensive simulations with the 2-D edge plasma transport code were done scanning the deuterium and impurity inventories practically for all impurity elements from beryllium to neon and the analysis of LPP variations in these scans is presented. It is shown that, for a given D inventory, the total radiation fraction with an increase in the impurity inventory reaches a flat top level, frad = 0.85 ± 0.01, whereas the higher frad corresponds to XPM. This critical fraction is the same for all elements and values of the D inventory. Successful RDD solutions with a flat top radiation meeting all ad hoc LPP criteria are found for some elements. Boron and nitrogen are shown to be the most promising elements for seeding, since they are capable of providing alone the successful RDD at the lowest concentrations. Several important effects on impurity radiation are considered including: cross-field impurity transport in regions with strong temperature gradients, multi-species thermal force, charge-exchange of impurity ions with D atoms originating from recombination, impurity entrainment by parallel flows, flows caused by inner/outer divertor asymmetries, and Mach ∼ 1 flows reached inside radiation-ionization fronts. The impurity radiation profiles of various elements are analyzed suggesting three patterns differing in the radiation front position with respect to the D ionization source. The modeled relocation of D from the pedestal into divertor regions; an enhanced pedestal enrichment for impurities with high first ionization potential; and RDD capability of confining inside the divertors the large D inventories as neutral atoms, are considered as effects of increasing impurity inventory. The responses of a flat-top RDD to the input parameters variation are studied. For example, dependencies of LPPs on the input power increase, which express the sharp and even bifurcation transitions between two distinct branches corresponding to the detached and attached divertors, are discussed.},
doi = {10.1063/1.4986516},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {Fri Oct 27 00:00:00 EDT 2017},
month = {Fri Oct 27 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
Works referenced in this record:
Modeling of Small-sized ELMs in Detached Divertor Plasmas: Modeling of Small-sized ELMs in Detached Divertor Plasmas
journal, June 2016
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Hollmann, E. M.
- Contributions to Plasma Physics, Vol. 56, Issue 6-8
Novel aspects of plasma control in ITER
journal, February 2015
- Humphreys, D.; Ambrosino, G.; de Vries, P.
- Physics of Plasmas, Vol. 22, Issue 2
Steady-state radiative cooling rates for low-density, high-temperature plasmas
journal, November 1977
- Post, D. E.; Jensen, R. V.; Tarter, C. B.
- Atomic Data and Nuclear Data Tables, Vol. 20, Issue 5
Developing and validating advanced divertor solutions on DIII-D for next-step fusion devices
journal, September 2016
- Guo, H. Y.; Hill, D. N.; Leonard, A. W.
- Nuclear Fusion, Vol. 56, Issue 12
Divertor plasma detachment
journal, May 2016
- Krasheninnikov, S. I.; Kukushkin, A. S.; Pshenov, A. A.
- Physics of Plasmas, Vol. 23, Issue 5
Impact of impurity seeding and divertor conditions on transitions, pedestal structure and ELMs
journal, October 2016
- Dunne, M. G.
- Nuclear Fusion, Vol. 57, Issue 2
The snowflake divertor
journal, November 2015
- Ryutov, D. D.; Soukhanovskii, V. A.
- Physics of Plasmas, Vol. 22, Issue 11
Dynamic plasma-wall modeling of ELMy H-mode with UEDGE-MB-W
journal, August 2015
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D.
- Journal of Nuclear Materials, Vol. 463
Impurity-induced divertor plasma oscillations
journal, January 2016
- Smirnov, R. D.; Kukushkin, A. S.; Krasheninnikov, S. I.
- Physics of Plasmas, Vol. 23, Issue 1
Impurity seeding and scaling of edge parameters in ITER
journal, June 2009
- Pacher, H. D.; Kukushkin, A. S.; Pacher, G. W.
- Journal of Nuclear Materials, Vol. 390-391
Analytic criteria for power exhaust in divertors due to impurity radiation
journal, April 1995
- Post, D.; Putvinskaya, N.; Perkins, F. W.
- Journal of Nuclear Materials, Vol. 220-222
Heat flux management via advanced magnetic divertor configurations and divertor detachment
journal, August 2015
- Kolemen, E.; Allen, S. L.; Bray, B. D.
- Journal of Nuclear Materials, Vol. 463
Development of impurity seeding and radiation enhancement in the helical divertor of LHD
journal, July 2015
- Mukai, K.; Masuzaki, S.; Peterson, B. J.
- Nuclear Fusion, Vol. 55, Issue 8
New approach in two-dimensional fluid modeling of edge plasma transport with high intermittency due to blobs and edge localized modes
journal, September 2011
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D.
- Physics of Plasmas, Vol. 18, Issue 9
Real-time radiative divertor feedback control development for the NSTX-U tokamak using a vacuum ultraviolet spectrometer
journal, August 2016
- Soukhanovskii, V. A.; Kaita, R.; Stratton, B.
- Review of Scientific Instruments, Vol. 87, Issue 11
Impact of divertor geometry on radiative divertor performance in JET H-mode plasmas
journal, February 2016
- Jaervinen, A. E.; Brezinsek, S.; Giroud, C.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 4
Implementation into B2 of a 21-moment description for the parallel transport
journal, January 1996
- Bergmann, A.; Igitkhanov, Yu.; Braams, B.
- Contributions to Plasma Physics, Vol. 36, Issue 2-3
Dynamic Models for Plasma-Wall Interactions
journal, June 2012
- Pigarov, A. Yu.; Krstic, P.; Krasheninnikov, S. I.
- Contributions to Plasma Physics, Vol. 52, Issue 5-6
Tungsten behaviour in radiatively cooled plasma discharges in ASDEX Upgrade
journal, August 2011
- Neu, R.; Kallenbach, A.; Sertoli, M.
- Journal of Nuclear Materials, Vol. 415, Issue 1
Multi-fluid transport code modeling of time-dependent recycling in ELMy H-mode
journal, June 2014
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D.
- Physics of Plasmas, Vol. 21, Issue 6
Stability of the detachment front in a tokamak divertor
journal, March 1999
- Krasheninnikov, S. I.; Rensink, M.; Rognlien, T. D.
- Journal of Nuclear Materials, Vol. 266-269
Impurity Transport at Arbitrary Densities in the Divertor Plasma
journal, January 1988
- Igitkhanov, Yu. L.
- Contributions to Plasma Physics, Vol. 28, Issue 4-5
Radiative snowflake divertor studies in DIII-D
journal, August 2015
- Soukhanovskii, V. A.; Allen, S. L.; Fenstermacher, M. E.
- Journal of Nuclear Materials, Vol. 463
Time-dependent 2-D modeling of edge plasma transport with high intermittency due to blobs
journal, July 2012
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D.
- Physics of Plasmas, Vol. 19, Issue 7
Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D–EIRENE
journal, August 2015
- Jaervinen, A. E.; Groth, M.; Airila, M.
- Journal of Nuclear Materials, Vol. 463
Application of the radiating divertor approach to innovative tokamak divertor concepts
journal, August 2015
- Petrie, T. W.; Allen, S. L.; Fenstermacher, M. E.
- Journal of Nuclear Materials, Vol. 463
Plasma surface interactions in impurity seeded plasmas
journal, August 2011
- Kallenbach, A.; Balden, M.; Dux, R.
- Journal of Nuclear Materials, Vol. 415, Issue 1
Divertor heat flux reduction and detachment experiments in NSTX
journal, June 2007
- Soukhanovskii, V. A.; Maingi, R.; Bush, C. E.
- Journal of Nuclear Materials, Vol. 363-365
Comparison of Ne and Ar seeded radiative divertor plasmas in JT-60U
journal, August 2015
- Nakano, T.
- Journal of Nuclear Materials, Vol. 463
Multi-fluid code simulations including anomalous non-diffusive transport of plasma and impurities in the tokamak SOL
journal, April 2004
- Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D.
- Contributions to Plasma Physics, Vol. 44, Issue 13
Compatibility of detached divertor operation with robust edge pedestal performance
journal, August 2015
- Leonard, A. W.; Makowski, M. A.; McLean, A. G.
- Journal of Nuclear Materials, Vol. 463
Impurity seeding in ITER DT plasmas in a carbon-free environment
journal, August 2015
- Pacher, H. D.; Kukushkin, A. S.; Pacher, G. W.
- Journal of Nuclear Materials, Vol. 463
Finalizing the ITER divertor design: The key role of SOLPS modeling
journal, December 2011
- Kukushkin, A. S.; Pacher, H. D.; Kotov, V.
- Fusion Engineering and Design, Vol. 86, Issue 12
A fully implicit, time dependent 2-D fluid code for modeling tokamak edge plasmas
journal, December 1992
- Rognlien, T. D.; Milovich, J. L.; Rensink, M. E.
- Journal of Nuclear Materials, Vol. 196-198
Self-sustained oscillations in the divertor plasma
journal, November 1987
- Krasheninnikov, S. I.; Kukushkin, A. S.; Pistunovich, V. I.
- Nuclear Fusion, Vol. 27, Issue 11
Impurity seeding for tokamak power exhaust: from present devices via ITER to DEMO
journal, November 2013
- Kallenbach, A.; Bernert, M.; Dux, R.
- Plasma Physics and Controlled Fusion, Vol. 55, Issue 12
Influence of impurity seeding on plasma burning scenarios for ITER
journal, November 2016
- Ivanova-Stanik, I.; Zagórski, R.; Voitsekhovitch, I.
- Fusion Engineering and Design, Vol. 109-111
Chapter 4: Power and particle control
journal, June 2007
- Loarte, A.; Lipschultz, B.; Kukushkin, A. S.
- Nuclear Fusion, Vol. 47, Issue 6