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Title: A new developed in-between shots lithium evaporation coating system for improving plasma performance in EAST

Abstract

A new in-between shots evaporative lithium coating system has been successfully developed and implemented on the Experimental Advanced Superconducting Tokamak (EAST) for the 2017 campaign. This paper describes a novel technique for the introduction of lithium into the EAST vessel allowing evaporative coatings to be applied between discharges without requiring a significant amount of time to insert and retract the lithium source. This newly designed system utilizes a rotating axis driven by a vacuum dynamic sealing feedthough under remote control to open and close a shutter. A compression bellows, which drives the delivery tube, guarantees accurate position of the oven thus avoiding possible direct contact with the plasma. This allows the new evaporation system to be operated in two distinct modes. One mode is operated in-between shots to refresh pre-coated lithium film, the other is a real-time lithium vapor injection during plasma operations to provide active wall conditioning during long pulse plasma discharges. In this paper, operation of this new lithium deposition system in the in-between shots replenishment mode is described. Initial experiments show that this system worked well during the interval of discharges in EAST, and the in-between shots lithium coating effectively reduced the wall recycling and impurity concentrations.more » Furthermore, the application of fresh lithium coating lead to sustain the plasma stored energy and confinement, as well as a reduction of impurity radiation.« less

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [3]
  1. Chinese Academy of Sciences, Hefei (China); Univ. of Science and Technology of China, Hefei (China)
  2. Chinese Academy of Sciences, Hefei (China); CAS Key Lab of Photovoltaic and Energy Conservation Materials, Hefei (China)
  3. Chinese Academy of Sciences, Hefei (China)
  4. Princeton Univ., Princeton, NJ (United States)
  5. Hunan Univ., Changsha (China)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1461184
Grant/Contract Number:  
2017YFA0402500; 11625524; 11605246; 11775261; 11261140328
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 133; Journal Issue: C; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Lithium; In-between shots; Plasma; EAST

Citation Formats

Xu, W., Hu, J. S., Zuo, G. Z., Sun, Z., Lunsford, R., Meng, X. C., and Huang, M.. A new developed in-between shots lithium evaporation coating system for improving plasma performance in EAST. United States: N. p., 2018. Web. https://doi.org/10.1016/j.fusengdes.2018.05.061.
Xu, W., Hu, J. S., Zuo, G. Z., Sun, Z., Lunsford, R., Meng, X. C., & Huang, M.. A new developed in-between shots lithium evaporation coating system for improving plasma performance in EAST. United States. https://doi.org/10.1016/j.fusengdes.2018.05.061
Xu, W., Hu, J. S., Zuo, G. Z., Sun, Z., Lunsford, R., Meng, X. C., and Huang, M.. Tue . "A new developed in-between shots lithium evaporation coating system for improving plasma performance in EAST". United States. https://doi.org/10.1016/j.fusengdes.2018.05.061. https://www.osti.gov/servlets/purl/1461184.
@article{osti_1461184,
title = {A new developed in-between shots lithium evaporation coating system for improving plasma performance in EAST},
author = {Xu, W. and Hu, J. S. and Zuo, G. Z. and Sun, Z. and Lunsford, R. and Meng, X. C. and Huang, M.},
abstractNote = {A new in-between shots evaporative lithium coating system has been successfully developed and implemented on the Experimental Advanced Superconducting Tokamak (EAST) for the 2017 campaign. This paper describes a novel technique for the introduction of lithium into the EAST vessel allowing evaporative coatings to be applied between discharges without requiring a significant amount of time to insert and retract the lithium source. This newly designed system utilizes a rotating axis driven by a vacuum dynamic sealing feedthough under remote control to open and close a shutter. A compression bellows, which drives the delivery tube, guarantees accurate position of the oven thus avoiding possible direct contact with the plasma. This allows the new evaporation system to be operated in two distinct modes. One mode is operated in-between shots to refresh pre-coated lithium film, the other is a real-time lithium vapor injection during plasma operations to provide active wall conditioning during long pulse plasma discharges. In this paper, operation of this new lithium deposition system in the in-between shots replenishment mode is described. Initial experiments show that this system worked well during the interval of discharges in EAST, and the in-between shots lithium coating effectively reduced the wall recycling and impurity concentrations. Furthermore, the application of fresh lithium coating lead to sustain the plasma stored energy and confinement, as well as a reduction of impurity radiation.},
doi = {10.1016/j.fusengdes.2018.05.061},
journal = {Fusion Engineering and Design},
number = C,
volume = 133,
place = {United States},
year = {2018},
month = {6}
}

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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: The sketch of in-between shots Li evaporation coating system on EAST

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Works referenced in this record:

Wall conditioning in fusion devices and its influence on plasma performance
journal, September 1996


Plasma boundary phenomena in tokamaks
journal, July 1990


Calculations of impurity radiation and its effects on tokamak experiments
journal, December 1977


Long-pulse hybrid scenario development in JT-60U
journal, May 2009


Initial results on plasma heating experiments in the ion cyclotron range of frequencies on EAST
journal, March 2012


Experimental studies of lithium-based surface chemistry for fusion plasma-facing materials applications
journal, June 2009


Enhanced performance of deuterium–tritium‐fueled supershots using extensive lithium conditioning in the Tokamak Fusion Test Reactor
journal, November 1995

  • Mansfield, D. K.; Strachan, J. D.; Bell, M. G.
  • Physics of Plasmas, Vol. 2, Issue 11
  • DOI: 10.1063/1.871050

Properties of vacuum-deposited Li films and impact on plasma performance in TJ-II
journal, November 2010


Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges
journal, August 2015


Primary Results of Lithium Coating for the Improvement of Plasma Performance in EAST
journal, December 2010


Lithium coating for H-mode and high performance plasmas on EAST in ASIPP
journal, July 2013


Influence of lithium coatings with large-area coverage on EAST plasma performance
journal, December 2014


Approaches towards long-pulse divertor operations on EAST by active control of plasma–wall interactions
journal, November 2013


Effort of lower hybrid current drive experiments toward to H-mode in EAST
journal, November 2016


New Steady-State Quiescent High-Confinement Plasma in an Experimental Advanced Superconducting Tokamak
journal, February 2015


    Works referencing / citing this record:

    Effects of lithium coating of the chamber wall on the STOR-M tokamak discharges
    journal, June 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.