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Title: Novel data interpretation method for DIII-D divertor retarding field energy analyzer with 3-D particle-in-cell simulations

Journal Article · · Review of Scientific Instruments
DOI: https://doi.org/10.1063/5.0218761 · OSTI ID:2403095
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. University of Tennessee, Knoxville, TN (United States); General Atomics
  2. University of Tennessee, Knoxville, TN (United States)
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A novel data interpretation process that utilizes comprehensive particle-in-cell (PIC) simulations is developed for the new retarding field energy analyzer (RFEA) currently being constructed at DIII-D for the lower divertor using the Divertor Material Evaluation System. Furthermore, this probe is expected to survive a heat load of up to 100 MW/m2 for up to 5 s and reliably measure the main ion temperature (Ti) on the divertor target ranging from 10 to 200 eV. These extreme conditions posed significant engineering limitations on the probe geometry, thus extensive validation work has been performed. The conventional fitting method for the RFEA I–V characteristics is based on a simplified 1-D model without considering the ion space charge inside the probe cavity and may not be sufficient for probes designed for the DIII-D divertor environment. In this article, a more realistic description of the particle propagation process within the RFEA cavity is achieved by including both 3-D geometric effects and ion space charge in the PIC simulations, and the capability to reconstruct the ion energy distribution functions is demonstrated with reasonable consistency.

Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FC02-04ER54698; SC0023378
OSTI ID:
2403095
Alternate ID(s):
OSTI ID: 2426955
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 95; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (14)

Scanning retarding field analyzer for plasma profile measurements in the boundary of the Alcator C-Mod tokamak journal March 2013
Space-charge limits of ion sensitive probes journal October 2013
A simple physical derivation of Child–Langmuir space-charge-limited emission using vacuum capacitance journal February 2005
Low-Z impurity transport in DIII-D – observations and implications journal March 2001
Modeling of sputtering erosion/redeposition—status and implications for fusion design journal July 2002
Beam-plasma instability in charged plasma in the absence of ions journal April 2016
Retarding field energy analyzer for the JET plasma boundary journal November 2003
Retarding field analyzer for the EAST plasma boundary journal December 2016
Plasma detachment from divertor targets and limiters journal April 1995
Publisher’s Note: “Ion temperature measurement techniques using fast sweeping retarding field analyzer (RFA) in strongly intermittent ASDEX Upgrade tokamak plasmas” [Rev. Sci. Instrum. 91, 063506 (2020)] journal July 2020
Edge ion-to-electron temperature ratio in the Tore Supra tokamak journal November 2008
Impact of selective ion transmission on measurement by retarding field analyzer journal May 2023
Ion Temperature Measurements in JET Boundary Plasmas Using a Retarding Field Analyser journal January 1996
Ion energy measurements in the scrape-off layer of MAST using a Retarding Field Analyzer journal August 2011

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Current-voltage characteristic
Measuring instruments
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Plasma material interactions
Plasma simulation
Plasma temperature
Tokamaks
Maxwell-Boltzmann distribution