Actuator Development Step by Step: Pellet Particle Flux Control for Single- and Multiple-Source Systems. (2nd January 2022)

• Record Type: Journal Article
• Authors: Lang, P. T.; Ploeckl, B.; Fischer, R.; Griener, M.; Kircher, M.; Kudlacek, O.; Phillips, G.; Sieglin, B.; Yamamoto, S.; Treutterer, W.; Team, AUG
• Is Part Of: Fusion science and technology. Volume 78:Number 1(2022)
• Page Start: 1
• Page End: 9
• Publication Date: 2022-01-02
• Subjects: ASDEX Upgrade -- JT-60SA -- tokamak -- pellet technology -- plasma control; Fusion reactors -- Periodicals; Nuclear fusion -- Periodicals; Fusion reactors; Nuclear fusion; Periodicals; 621.48405
• DOI: 10.1080/15361055.2021.1940034
• Languages: English
• ISSNs: 1536-1055

Abstract

Abstract: Fuel injection by means of solid cryogenic pellets is expected to provide a sound and efficient tool. Hence, the installation of a pellet launching system will be a necessity. Yet, pellets are considered as a serviceable actuator for integrated supplementary functions as, e.g., fast and efficient delivery of seeding gas, or in case needed, the pacing of edge-localized modes. Consequently, a control scheme has to be developed that is capable of mastering the simultaneous actuations covering different tasks. Our scheme relies on pellet launching by a centrifuge accelerator, providing the option for precisely predictable pellet injection sequences. In order to develop a suitable actuator control scheme, as a first step the central part was brought into service at ASDEX Upgrade. It proved operational for feedback particle flux control of a single pellet source. In a subsequent step, it is now upgraded to enable multitasked control of the JT-60SA multipellet source currently under construction. In its finally designated configuration, this control scheme provides a potential solution for a reactor-grade system.