Public Abstract

DE-SC0016915: Control of the Plasma-Material Interface for Long Pulse Optimization in EAST and KSTAR

Award Status: Inactive

Institution: The University of Tennessee, Knoxville, TN
UEI: FN2YCS2YAUW3
DUNS:

Most Recent Award Date: 02/05/2020
Number of Support Periods: 3
PM: Lanctot, Matthew

Current Budget Period: 12/15/2018 - 08/28/2020
Current Project Period: 12/15/2016 - 08/28/2020
PI: Wirth, Brian

Supplement Budget Period: N/A

Public Abstract

Control of the Plasma-Material Interface for Long Pulse Optimization in the Experimental Advanced Superconducting Tokamak Lead PI: Rajesh Maingi, PPPL Institutional PIs: Brian Wirth, University of Tennessee John Canik, ORNL Daniel Andruczyk, UIUC Graham Wright, MIT Kevin Tritz, Johns Hopkins University Zhehui Wang, LANL The aim of this project is to understand and control the plasma-material interface to improve long pulse discharge control and performance in the Experimental Advanced Superconducting Tokamak (EAST) device, emphasizing the unique strength of this facility. A multi-institutional team consisting of national labs and universities will conduct the collaborative research. The focus of this project is on long pulse recycling control and optimization, which requires optimization because of the broad range of materials used for plasma-facing components (PFC) and wall conditioning techniques in EAST. EAST uses both lithium deposition and cryogenic condensation pumps for control of plasma recycling from the PFCs during long pulse discharges. The research elements include: Evaluate the performance of the different PFC materials, which include tungsten, molybdenum, and graphite, and the role of lithium wall conditioning, including determination of the minimal usage for acceptable performance; optimize lithium delivery tools Analyze the roles of the lithium and the divertor cryopump in long pulse recycling and density control, and provide a physics-based re-design of the lower divertor plenum to optimize cryopump particle exhaust Measure net erosion and material migration with the use of marker tiles, and enhanced impurity density diagnostics Because long pulse recycling control is needed for next step devices, the knowledge will be used to improve reactor designs, while also advancing the EAST program.

Control of the Plasma-Material Interface for Long Pulse Optimization in the Experimental

Advanced Superconducting Tokamak

Lead PI: Rajesh Maingi, PPPL

Institutional PIs: Brian Wirth, University of Tennessee

John Canik, ORNL

Daniel Andruczyk, UIUC

Graham Wright, MIT

Kevin Tritz, Johns Hopkins University

Zhehui Wang, LANL

The aim of this project is to understand and control the plasma-material interface to improve long pulse discharge control and performance in the Experimental Advanced Superconducting Tokamak (EAST) device, emphasizing the unique strength of this facility. A multi-institutional team consisting of national labs and universities will conduct the collaborative research.

The focus of this project is on long pulse recycling control and optimization, which requires optimization because of the broad range of materials used for plasma-facing components (PFC) and wall conditioning techniques in EAST. EAST uses both lithium deposition and cryogenic condensation pumps for control of plasma recycling from the PFCs during long pulse discharges. The research elements include:

Evaluate the performance of the different PFC materials, which include tungsten, molybdenum, and graphite, and the role of lithium wall conditioning, including determination of the minimal usage for acceptable performance; optimize lithium delivery tools

Analyze the roles of the lithium and the divertor cryopump in long pulse recycling and density control, and provide a physics-based re-design of the lower divertor plenum to optimize cryopump particle exhaust

Measure net erosion and material migration with the use of marker tiles, and enhanced impurity density diagnostics

Because long pulse recycling control is needed for next step devices, the knowledge will be used to improve reactor designs, while also advancing the EAST program.