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Title: A multi-species powder dropper for magnetic fusion applications

Abstract

Here, we present a device for controlled injection of a variety of materials in powder form. The system implements four independent feeder units, arranged to share a single vertical drop tube. Each unit consists of a 80 ml reservoir, coupled to a horizontal linear trough, where a layer of powder is advanced by piezo-electric agitation at a speed proportional to the applied voltage, until it falls into a drop tube. The dropper has been tested with a number of impurities of low (B, BN, C), intermediate (Si, SiC), and high Z (Sn) and a variety of microscopic structures (flakes, spheres, rocks) and sizes (5-200 μm). For low Z materials, drop rates ~2-200 mg/s have been obtained showing good repeatability and uniformity. A calibrated light-emitting diode (LED)-based flowmeter allows measuring and monitoring the drop rate during operation. The fast time-response of the four feeders allows combination of steady and pulsed injections, providing a flexible tool for controlled-dose, real-time impurity injection in fusion plasmas.

Authors:
 [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1485110
Alternate Identifier(s):
OSTI ID: 1479131
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Nagy, A., Bortolon, A., Mauzey, D. M., Wolfe, E., Gilson, E. P., Lunsford, R., Maingi, R., Mansfield, D. K., Nazikian, R., and Roquemore, A. L. A multi-species powder dropper for magnetic fusion applications. United States: N. p., 2018. Web. doi:10.1063/1.5039345.
Nagy, A., Bortolon, A., Mauzey, D. M., Wolfe, E., Gilson, E. P., Lunsford, R., Maingi, R., Mansfield, D. K., Nazikian, R., & Roquemore, A. L. A multi-species powder dropper for magnetic fusion applications. United States. doi:10.1063/1.5039345.
Nagy, A., Bortolon, A., Mauzey, D. M., Wolfe, E., Gilson, E. P., Lunsford, R., Maingi, R., Mansfield, D. K., Nazikian, R., and Roquemore, A. L. Thu . "A multi-species powder dropper for magnetic fusion applications". United States. doi:10.1063/1.5039345. https://www.osti.gov/servlets/purl/1485110.
@article{osti_1485110,
title = {A multi-species powder dropper for magnetic fusion applications},
author = {Nagy, A. and Bortolon, A. and Mauzey, D. M. and Wolfe, E. and Gilson, E. P. and Lunsford, R. and Maingi, R. and Mansfield, D. K. and Nazikian, R. and Roquemore, A. L.},
abstractNote = {Here, we present a device for controlled injection of a variety of materials in powder form. The system implements four independent feeder units, arranged to share a single vertical drop tube. Each unit consists of a 80 ml reservoir, coupled to a horizontal linear trough, where a layer of powder is advanced by piezo-electric agitation at a speed proportional to the applied voltage, until it falls into a drop tube. The dropper has been tested with a number of impurities of low (B, BN, C), intermediate (Si, SiC), and high Z (Sn) and a variety of microscopic structures (flakes, spheres, rocks) and sizes (5-200 μm). For low Z materials, drop rates ~2-200 mg/s have been obtained showing good repeatability and uniformity. A calibrated light-emitting diode (LED)-based flowmeter allows measuring and monitoring the drop rate during operation. The fast time-response of the four feeders allows combination of steady and pulsed injections, providing a flexible tool for controlled-dose, real-time impurity injection in fusion plasmas.},
doi = {10.1063/1.5039345},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

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Free Publicly Available Full Text
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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: (a) Schematic longitudinal cross-section of a powder feeder illustrating the flow of powder from the primary reservoir to the secondary and trough. (b) Impurity powder dropper assembly on the testbench, for vacuum testing before installation.

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Works referenced in this record:

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