"Modelling the JET H-mode pedestal plasma with gyrokinetic PIC codes," by Tuomas Koskela (Aalto University, Helsinki)

Tuesday, May 26, 2015 - 1:00pm to 2:00pm
Plasma Seminars

Plasma Seminar

Physics and Astronomy Building (PAB) Room 4-330
Tuesday, May 26, 2015
Refreshments at 12:30PM

Guest Speaker: Tuomas Koskela (Aalto University, Helsinki)

Talk Title: "Modelling the JET H-mode pedestal plasma with gyrokinetic PIC codes"


With the installation of the ITER-Like Wall (ILW), the composition of impurities in JET plasmas has changed from dominantly carbon (C) to beryllium (Be) and tungsten (W). High-performance discharges with the ILW have featured lower pedestal pressure and, therefore, worse global confinement than similar C-wall experiments.  To develop scenarios for DT operation and predict the performance of future experiments, a better understanding of the transport processes in the pedestal is needed.

In this talk, I will discuss the modelling of transport in JET pedestal plasma using the XGC codes. The XGC codes are full-f PIC codes that can simulate multispecies plasmas and neutrals in realistic divertor geometry including an X-point and the Scrape-off layer. The aim of the study is understanding the influence of neutrals and impurities on collisional transport in the JET pedestal. XGC modelling has shown that orbit effects are important in the steep gradient region where the gradient scale length is comparable to the banana orbit width.

PAB 4-708