Targeting a Versatile Actuator for EU-DEMO: Novel Control Scheme for Multisource Pellet Injector. (3rd April 2021)

• Record Type: Journal Article
• Authors: Ploeckl, B.; Lang, P. T.; Kircher, M.; Bock, A.; Gude, A.; Janky, F.; Sieglin, B.; Suttrop, W.; Treutterer, W.; Zehetbauer, T.
• Is Part Of: Fusion science and technology. Volume 77:Number 3(2021)
• Page Start: 199
• Page End: 205
• Publication Date: 2021-04-03
• Subjects: Pellet -- EU-DEMO -- plasma control, fueling; Fusion reactors -- Periodicals; Nuclear fusion -- Periodicals; Fusion reactors; Nuclear fusion; Periodicals; 621.48405
• DOI: 10.1080/15361055.2020.1864172
• Languages: English
• ISSNs: 1536-1055

Abstract

Abstract: Reactor plasma core fueling requires the injection of cryogenic pellets, most probably composed of a mixture of D2 and T2 . Likely, pellet injection will be the most important actuator for plasma core density control. Therefore, pellet injection systems must be developed further that are capable of acting as actuator for density control. A novel control scheme is developed based on a centrifuge acceleration system. This scheme considers every available pellet launching slot and compares the current particle flux with the requested one. The response time is within the granularity of the available launching slots, in this case between 7 and 12 ms. First plasma experiments in feedforward mode showed excellent results, providing a good basis for upcoming plasma core density feedback control development activities.