High-heat flux ball-pen probe head in ASDEX-Upgrade

G. Grenfell, J. Adamek, M. Komm, D. Brida, G. D. Conway, P. Manz, P. Tolias, T. Eich, D. Sestak, A. Herrmann, T. Nishizawa, U. Stroth

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. Composed of seven pins (four Langmuir probes, mounted in two Mach probe pairs, and three ball-pen probes), the new probe head allows us to measure several plasma parameters simultaneously and with high temporal resolution. A novel method to correct the sheath potential dynamically accounting for the total secondary electron emission is introduced together with applications to obtain the electron temperature and plasma potential profiles. The total secondary electron emission yield is obtained from particle in cell simulations in AUG condition and probe realistic impact angle with respect to the magnetic field. Finally, the probe capability to investigate turbulence around the separatrix of AUG is discussed.

Original languageEnglish
Article number023507
JournalReview of Scientific Instruments
Volume93
Issue number2
DOIs
Publication statusPublished - Feb 1 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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