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Modelling Ion Cyclotron Resonance Heating and Fast Wave Current Drive in Tokamaks
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fast magnetosonic waves in the ion cyclotron range of frequencies have the potential to heat plasma and drive current in a thermonuclear fusion reactor. A code, SELFO-light, has been developed to study the physics of ion cyclotron resonantheating and current drive in thermonuclear fusion reactors. It uses a global full wave solver LION and a new 1D Fokker-Planck solver for the self-consistent calculations of the wave field and the distribution function of ions.In present day tokamak experiments like DIII-D and JET, fast wave damping by ions at higher harmonic cyclotron frequencies is weak compared to future thermonuclear tokamak reactors like DEMO. The strong damping by deuterium, tritium and thermonuclear alpha-particles and the large Doppler width of fast alpha-particles in DEMO makes it difficult to drive the current when harmonic resonance layers of these ionspecies are located at low field side of the magnetic axis. At higher harmonic frequencies the possibility of fast wave current drive diminishes due to the overlapping of alpha-particle harmonic resonance layers. Narrow frequency bands suitable for the fast wave current drive in DEMO have been identified at lower harmonics of the alpha-particles. For these frequencies the effect of formation of high-energy tails in the distribution function of majority and minority ion species on the current drive have been studied. Some of these frequencies are found to provide efficient ion heating in the start up phase of DEMO. The spectrum where efficient current drive can be obtained is restricted due to weak electron damping at lower toroidal mode numbers and strong trapped electron damping at higher toroidal mode numbers. The width of toroidal mode spectra for which efficient current drive can be obtained have been identified, which has important implications for the antenna design.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xii, 53 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2013:013
Keyword [en]
Thermonuclear fusion, Tokamak, DIII-D, JET, ITER, DEMO, ICRF, ICRH, Fast magnetosonic waves, TTMP, ELD, ICRH, Thermonuclear
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-119930ISBN: 978-91-7501-692-4 (print)OAI: oai:DiVA.org:kth-119930DiVA: diva2:612924
Public defence
2013-04-23, Sal F3, Lindstedsvägen 26, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20130327

Available from: 2013-03-27 Created: 2013-03-25 Last updated: 2014-08-29Bibliographically approved
List of papers
1. Fast wave current drive scenarios for DEMO
Open this publication in new window or tab >>Fast wave current drive scenarios for DEMO
2013 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 53, no 4, 043005- p.Article in journal (Refereed) Published
Abstract [en]

Scenarios for non-inductive current drive using the fast magnetosonic wave in the ion cyclotron range of frequencies in DEMO have been studied. The strong ion cyclotron damping and large Doppler broadening of the alpha particles are shown to limit the possible current drive scenarios to four frequency bands. However, these scenarios may be compromised in the presence of impurities with unfavourable charge to mass ratio. For each frequency the current drive efficiency is optimized with respect to the parallel wave number. The optimized current drive efficiencies are comparable to that from neutral beam injection and electron cyclotron heating, and thus the ion cyclotron range of frequencies should remain a candidate for driving the non-inductive current in DEMO.

Keyword
DIII-D Tokamak, Plasmas, Absorption, Physics
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-119986 (URN)10.1088/0029-5515/53/4/043005 (DOI)000316049300006 ()2-s2.0-84876117531 (Scopus ID)
Funder
Swedish Research Council, 621-2011-5387
Note

QC 20130326

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2017-12-06Bibliographically approved
2. Self-consistent Ion Cyclotron Resonant Heating and Fast Wave Current Drive for DEMO
Open this publication in new window or tab >>Self-consistent Ion Cyclotron Resonant Heating and Fast Wave Current Drive for DEMO
(English)Article in journal (Other academic) Submitted
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-119988 (URN)
Note

QS 2013

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2013-03-27Bibliographically approved
3. A Fokker-Planck Code for Fast Self-Consistent Calculations of ICRH
Open this publication in new window or tab >>A Fokker-Planck Code for Fast Self-Consistent Calculations of ICRH
2010 (English)In: 37th EPS Conference on Plasma Physics, 2010Conference paper, Published paper (Other academic)
Abstract [en]

Modeling of ion cyclotron resonant heating, ICRH, requires self-consistent modeling of the distribution function of the resonant ion species and the wave field. A method has been devised for fast self-consistent calculation of the distribution function and the wave field for ICRH modeling. The distribution function is obtained by solving a pitch angle averaged 1D time dependent Fokker Planck equation that includes the Coulomb collision and quasi-linear operators. The quasi-linear operators describing the wave-particle interactions are obtained from the LION code [1]. The time dependent 1D Fokker-Planck equation solved with a cubic finite element method will be presented in this report. The modifications of the susceptibility tensors of the resonant ion species due to changes of the distribution functions caused by heating are calculated by the Fokker-Planck solver and then used in the LION code for calculating the modified wave field

National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-119989 (URN)2-s2.0-84875686004 (Scopus ID)
Conference
37th EPS Conference on Plasma Physics
Note

QC 20130326

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2013-03-27Bibliographically approved
4. Self-Consistent ICRH Modelling
Open this publication in new window or tab >>Self-Consistent ICRH Modelling
Show others...
2011 (English)In: RADIO FREQUENCY POWER IN PLASMAS: PROCEEDINGS OF THE 19TH TOPICAL CONFERENCE, 2011, 365-368 p.Conference paper, Published paper (Refereed)
Abstract [en]

A new code for self-consistent modelling of ion cyclotron heating suitable for routine calculations has been developed.

Series
AIP Conference Proceedings, ISSN 0094-243X ; 1406
Keyword
ICRH, Current drive
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-92371 (URN)10.1063/1.3664994 (DOI)000301041300078 ()2-s2.0-84857949301 (Scopus ID)978-0-7354-0978-1 (ISBN)
Conference
19th Topical Conference on Radio Frequency Power in Plasmas/US-Japan Workshop on RF Physics JUN 01-03, 2011 Newport, RI
Note
QC 20120417Available from: 2012-04-17 Created: 2012-04-02 Last updated: 2013-03-27Bibliographically approved
5. On fast wave current drive at higher cyclotron harmonics
Open this publication in new window or tab >>On fast wave current drive at higher cyclotron harmonics
2011 (English)In: 38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts: Volume 35 1, 2011, 889-892 p.Conference paper, Published paper (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-81125 (URN)2-s2.0-84867640871 (Scopus ID)978-161839593-1 (ISBN)
Conference
38th EPS Plasma Physics Conference, Strasbourgh, France 2011
Note

QC 20140903

Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2014-10-02Bibliographically approved
6. A dielectric response model for FEM solutions of ICRF wave fields
Open this publication in new window or tab >>A dielectric response model for FEM solutions of ICRF wave fields
Show others...
2012 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 401, no 1, 012009- p.Article in journal (Refereed) Published
Abstract [en]

Modelling of fast wave ICRF heating in large machines with high density such as DEMO is challenging because of the short wave lengths. Therefore, fast, efficient global wave solvers are necessary. A major difficulty with calculating the wave field in a spatial dispersive medium is that the dielectric tensor becomes a function of the local wave vector, which in its turn depends on the solution. Furthermore, the solution may consist of several waves co-existing at the same location subjected to separate response functions. In order to model upshift of the parallel wave vector, higher order FLR-effects on the cyclotron absorption and TTMP damping for the electron absorption methods based on iteration, suitable for FEM codes, are proposed.

Keyword
Plasmas, Conversion
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-119176 (URN)10.1088/1742-6596/401/1/012009 (DOI)000312549900009 ()2-s2.0-84874176875 (Scopus ID)
Conference
13th Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas, 27 August 2012 through 31 August 2012, Varenna
Note

QC 20130311

Available from: 2013-03-11 Created: 2013-03-08 Last updated: 2017-12-06Bibliographically approved
7. Self-consistent ICRH modelling
Open this publication in new window or tab >>Self-consistent ICRH modelling
Show others...
2012 (English)In: 39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics: Volume 2, 2012, 2012, 1106-1109 p.Conference paper, Published paper (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-128965 (URN)2-s2.0-84876897901 (Scopus ID)978-162276981-0 (ISBN)
Conference
39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics; Stockholm; Sweden; 2 July 2012 through 6 July 2012
Note

QC 20130919

Available from: 2013-09-19 Created: 2013-09-17 Last updated: 2014-08-29Bibliographically approved
8. On Self-Consistent ICRH Modelling
Open this publication in new window or tab >>On Self-Consistent ICRH Modelling
Show others...
(English)Article in journal (Other academic) Submitted
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-119996 (URN)
Note

QS 2013

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2013-04-05Bibliographically approved

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