Abstract
| Original language | English |
|---|---|
| Article number | 025010 |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 62 |
| Issue number | 2 |
| Number of pages | 13 |
| ISSN | 0741-3335 |
| DOIs | |
| Publication status | Published - 2020 |
Keywords
- Parametric decay instabilities
- Particle in cell
- Upper hybrid layer
- Electron Bernstein waves
Cite this
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Particle-in-cell simulations of parametric decay instabilities at the upper hybrid layer of fusion plasmas to determine their primary threshold. / Senstius, Mads Givskov; Nielsen, Stefan Kragh; Vann, R. G.; Hansen, Søren Kjer.
In: Plasma Physics and Controlled Fusion, Vol. 62, No. 2, 025010, 2020.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Particle-in-cell simulations of parametric decay instabilities at the upper hybrid layer of fusion plasmas to determine their primary threshold
AU - Senstius, Mads Givskov
AU - Nielsen, Stefan Kragh
AU - Vann, R. G.
AU - Hansen, Søren Kjer
PY - 2020
Y1 - 2020
N2 - Parametric decay instabilities (PDIs) are nonlinear processes by which energy from a strong pump wave may be directed into other waves at other frequencies, in particular natural modes of the medium, provided that energy and momentum are conserved. The particle-in-cell (PIC) code EPOCH is used to simulate PDIs in a magnetically confined fusion plasma converting a 105 GHz microwave X-mode pump wave into electrostatic daughter waves at the upper hybrid (UH) layer. Modes associated with the PDIs as well as a linearly converted electron Bernstein wave (EBW) are identified in f- and k-space. The PDI daughter modes are found to agree with experimental observations from ASDEX Upgrade as well as with analytical predictions, showing a nonlinear increase in power above a predicted threshold.
AB - Parametric decay instabilities (PDIs) are nonlinear processes by which energy from a strong pump wave may be directed into other waves at other frequencies, in particular natural modes of the medium, provided that energy and momentum are conserved. The particle-in-cell (PIC) code EPOCH is used to simulate PDIs in a magnetically confined fusion plasma converting a 105 GHz microwave X-mode pump wave into electrostatic daughter waves at the upper hybrid (UH) layer. Modes associated with the PDIs as well as a linearly converted electron Bernstein wave (EBW) are identified in f- and k-space. The PDI daughter modes are found to agree with experimental observations from ASDEX Upgrade as well as with analytical predictions, showing a nonlinear increase in power above a predicted threshold.
KW - Parametric decay instabilities
KW - Particle in cell
KW - Upper hybrid layer
KW - Electron Bernstein waves
U2 - 10.1088/1361-6587/ab49ca
DO - 10.1088/1361-6587/ab49ca
M3 - Journal article
VL - 62
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
SN - 0741-3335
IS - 2
M1 - 025010
ER -