Recent I-mode investigations from the ASDEX Upgrade tokamak are reported. It is shown that neutral-beam-injection heated I-modes can be stationary, which is important in terms of extrapolability towards future fusion devices. Furthermore, detailed studies on the weakly coherent mode are reported. In particular, experimental observations point...
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April 4, 2022 (v1)PublicationUploaded on: March 25, 2023
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January 11, 2023 (v1)Publication
Experiments on nitrogen assisted divertor detachment in the improved energy confinement mode (I-mode) are reported from the ASDEX Upgrade tokamak. When nitrogen is introduced into the divertor and radiation losses cool the divertor plasma down, a loss of core confinement is observed, concomitant with an increase in low frequency edge...
Uploaded on: March 24, 2023 -
April 5, 2022 (v1)Publication
The I-mode confinement regime can feature small edge temperature drops that can lead to an increase in the energy deposited onto the divertor targets. In this work, we show that these events are associated with a relaxation of both electron temperature and density edge profiles, with the largest drop found at the pedestal top position. The...
Uploaded on: December 4, 2022 -
April 28, 2022 (v1)Publication
US DOE (DE-SC0006419, DE-SC0014264, and DE- SC0017381)
Uploaded on: December 4, 2022 -
March 28, 2022 (v1)Publication
In some conditions, I-mode plasmas can feature pedestal relaxation events (PREs) that transiently enhance the energy reaching the divertor target plates. To shed light on their appearance, characteristics and energy reaching the divertor targets, a comparative study between two tokamaks — Alcator C-Mod and ASDEX Upgrade — is carried out. It is...
Uploaded on: December 5, 2022