A multi-species powder dropper for magnetic fusion applications

Nagy, A.; Bortolon, A.; Mauzey, D. M.; Wolfe, E.; Gilson, E. P.; Lunsford, R.; Maingi, R.; Mansfield, D. K.; Nazikian, R.; Roquemore, A. L.

doi:10.1063/1.5039345

A multi-species powder dropper for magnetic fusion applications

Journal Article · Thu Oct 25 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039345· OSTI ID:1485110

Nagy, A. ^[1]; ^[1]; Mauzey, D. M. ^[1]; Wolfe, E. ^[1]; ^[1]; Lunsford, R. ^[1]; Maingi, R. ^[1]; Mansfield, D. K. ^[1]; Nazikian, R. ^[1]; Roquemore, A. L. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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.

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1485110

Alternate ID(s):: OSTI ID: 1479131

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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