HEPP Seminar Summer 2026 #5: V. Murugesan / Y. Tao

Monday 11 May 2026, 15:30 → 17:00 Europe/Berlin

HGW-SR2 / GAR-D2

Gustavo Grenfell (Max Planck Institute for Plasma Physics - Garching), René Bussiahn (IPP Bereich Greifswald)

https://eu02web.zoom-x.de/j/68203618730?pwd=0ftcdSo212mi4VamayjXSCmZX0tUZJ.1

Meeting-ID: 682 0361 8730
Kenncode: 267281

 

16:00 → 16:30 V. Murugesan (P): ECRH power deposition measurements using ECE radiometers at W7-X

Electron Cyclotron Resonance Heating (ECRH) is a prominent heating scheme in many modern fusion machines. The narrow deposition width of ECRH makes it an effective tool for plasma profile shaping and turbulence control. The experimental validation of said narrow power deposition, however, has proved to be challenging, limited by the diagnostic capabilities and heat diffusion timescales [1].
ECRH modulation and switching experiments offer a unique way of deriving power deposition profiles in magnetically confined plasmas [2]. ECRH modulation initiates perturbations in local electron temperature (Te) that are observed as an immediate response in the Electron Cyclotron Emission (ECE) signals. The instantaneous response of the ECE channels probing the magnetic flux surfaces in the vicinity of heating is used to derive power deposition profiles.
This work presents narrow ECRH power deposition profiles measured using standalone calibrated ECE radiometers [3] at Wendelstein 7-X (W7-X). The results are discussed alongside mathematically derived ray-tracing [4] results for plasma discharges from the experimental campaign 2.3 at W7-X.

References:
(1) Kirov, K. K.,. PPCF 46.11 (2002): 2583.
(2) Van Eester, D. PPCF 46.11 (2004): 1675.
(3) Hirsch, M., et al., EPJ Web of Conferences, vol. 203, (2019.)

Speaker: Vaishnavi Murugesan (IPP Bereich Greifswald)

HEPP progress talk.pptx

16:30 → 17:00 Y. Tao (P): Towards the Application of the Gyrokinetic Code GENE-X to Tokamak and Stellarator Scrape-Off Layer Turbulence

Predicting heat loads in the scrape-off layer (SOL) is a major challenge for future fusion divertors, largely due to the complex interplay between turbulence and boundary plasma physics. Gyrokinetic simulations provide a powerful tool for investigating SOL turbulence; however, their predictive capability critically depends on the incorporation of plasma sheath physics at the divertor targets. The plasma sheath plays a key role in regulating turbulent transport and heat exhaust, and its proper treatment is therefore crucial for reliable heat flux predictions and divertor design.

In this work, we will apply sheath boundary conditions to the full-f gyrokinetic turbulence code GENE-X in full tokamak and stellarator geometry, and present some preliminary results. Since the sheath structure cannot be fully resolved in gyrokinetic simulations, we start from a reduced sheath model that captures the essential physics while omitting the sheath complexity at the same time. Then we will test it in TCV geometry and study its impact.

Speaker: Yantong Tao (IPP)

hepp_progress_talk_Yantong_Tao.pdf