Control of the Plasma-Material Interface for Long Pulse Optimization in EAST Final Report

Tritz, Kevin; Maingi, Rajesh; Wirth, Brian; Andruczyk, Daniel; Woller, Kevin; Wang, ‪Zhehui; Canik, John

doi:10.2172/1734975

Title: Control of the Plasma-Material Interface for Long Pulse Optimization in EAST Final Report

Technical Report · Thu Dec 10 00:00:00 EST 2020

DOI:https://doi.org/10.2172/1734975· OSTI ID:1734975

Tritz, Kevin ^[1]; Maingi, Rajesh; Wirth, Brian; Andruczyk, Daniel; Woller, Kevin; Wang, ‪Zhehui; Canik, John

Johns Hopkins Univ., Baltimore, MD (United States)

This final report describes the funded activity to understand and control the plasma-material interface to improve long pulse discharge control and performance on the EAST (Experimental Advanced Superconducting Tokamak) facility, located in Hefei, China. The primary focus of the research was long pulse recycling control via optimization of lithium (Li) delivery systems, including flowing liquid lithium plasma facing components (PFCs), because Li persists as the main wall conditioning technique. On EAST, lithium was primarily introduced using crucible evaporation, pellet injection, and gravitationally dropped powder. Overall, the introduction of lithium into the EAST plasma had strong and persistent effects on the ELM behavior during long pulse EAST discharges demonstrating overall improved performance. Additionally, a flexible impurity injection tool, a multi-chamber impurity powder dropper, was developed and deployed on EAST, to extend powder injection to elements other than Li. Finally, improvements to the Soft X-ray diagnostic system were introduced to improve measurements of impurity transport and electron temperature.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

DOE Contract Number:: SC0016553

OSTI ID:: 1734975

Report Number(s):: DOE-JHU-16553; TRN: US2214731

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
fusion
plasma
tokamak
lithium
ELMs
conditioning

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Title: Control of the Plasma-Material Interface for Long Pulse Optimization in EAST Final Report

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