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Title: Free surface stability of liquid metal plasma facing components

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1295988
Grant/Contract Number:
FOA-0000603
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 10; Related Information: CHORUS Timestamp: 2016-08-17 03:18:11; Journal ID: ISSN 0029-5515
Publisher:
IOP Publishing
Country of Publication:
IAEA
Language:
English

Citation Formats

Fiflis, P., Christenson, M., Szott, M., Kalathiparambil, K., and Ruzic, D. N. Free surface stability of liquid metal plasma facing components. IAEA: N. p., 2016. Web. doi:10.1088/0029-5515/56/10/106020.
Fiflis, P., Christenson, M., Szott, M., Kalathiparambil, K., & Ruzic, D. N. Free surface stability of liquid metal plasma facing components. IAEA. doi:10.1088/0029-5515/56/10/106020.
Fiflis, P., Christenson, M., Szott, M., Kalathiparambil, K., and Ruzic, D. N. 2016. "Free surface stability of liquid metal plasma facing components". IAEA. doi:10.1088/0029-5515/56/10/106020.
@article{osti_1295988,
title = {Free surface stability of liquid metal plasma facing components},
author = {Fiflis, P. and Christenson, M. and Szott, M. and Kalathiparambil, K. and Ruzic, D. N.},
abstractNote = {},
doi = {10.1088/0029-5515/56/10/106020},
journal = {Nuclear Fusion},
number = 10,
volume = 56,
place = {IAEA},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/0029-5515/56/10/106020

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  • Liquid metal plasma-facing components (PFCs) provide numerous potential advantages over solid-material components. One critique of the approach is the relatively less developed technologies associated with deploying these components in a fusion plasma-experiment. Exploration of the temperature limits of liquid lithium PFCs in a tokamak divertor and the corresponding consequences on core operation are a high priority informing the possibilities for future liquid lithium PFCs. An all-metal NSTX-U is envisioned to make direct comparison between all high-Z wall operation and liquid lithium PFCs in a single device. By executing the all-metal upgrades incrementally, scientific productivity will be maintained while enabling physicsmore » and engineering-science studies to further develop the solid- and liquid-metal components. Six major elements of a flowing liquid-metal divertor system are described and a three-step program for implementing this system is laid out. The upgrade steps involve the first high-Z divertor target upgrade in NSTX-U, pre-filled liquid metal targets and finally, an integrated, flowing liquid metal divertor target. As a result, two example issues are described where the engineering and physics experiments are shown to be closely related in examining the prospects for future liquid metal PFCs.« less
  • This paper will report on the proof-of-principle (POP) experiments conducted to demonstrate reduced wall recycling, using a laboratory-scale test unit, constructed based on the concept of moving-surface plasma-facing component (MS-PFC). In this concept, the moving-surface exposed to edge plasmas in steady state magnetic fusion devices is continuously deposited ex-situ with a getter material, so that particle trapping capabilities can be regenerated prior to the subsequent exposure. In our previous paper, the construction details of the MS-PFC test unit and the first results in the case of titanium gettering was reported, but in the present paper preliminary results in the casemore » of lithium gettering will be presented for comparison. Results indicate that the H{sub {alpha}} light intensity used as the measure of hydrogen recycling is reduced by {approx}6% due to titanium gettering and by {approx}12% due to lithium gettering, both at steady state.« less
  • In our previous work, the first proof-of-principle experiments were successfully conducted on the particle control capability based on the concept of moving-surface plasma-facing component (MS-PFC). Over a continuously titanium-gettered rotating drum, hydrogen recycling was found to be reduced down to levels around 94% even at steady state. These experiments on the MS-PFC concept have now been extended to the second stage where lithium is employed as the getter material, while using the same rotating drum. These experiments are intended to pilot the potential use of lithium as a flowing liquid facing the edge plasmas in steady state reactors beyond ITER.more » Reported in this paper are rather dramatic findings that hydrogen recycling is reduced down to levels around 76% and 86% at steady state over the rotating drum at the lithium deposition rates of 9.5 A/s and 7.3 A/s, respectively. These steady state recycling data have been nicely reproduced by a simple zero-dimensional particle balance model.« less