A method to produce lithium pellets for fueling and ELM pacing in NSTX-U

Daniel Andruczyk, A. L. Roquemore, P. Fiflis, D. Mansfield, David N Ruzic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A device has been developed that produces spherical lithium pellets for the controlled excitation, or pacing, of ELMs and replenishing lithium coating on PFCs during a plasma shot. The device is based on a dripper design, where the lithium is forced through a small orifice with gas pressure. It is envisaged to use the dripper in two ways: first it is used in conjunction with the lithium granular injector developed at PPPL for ELM pacing and the second for replenishing lithium PFC coatings during a plasma discharge by 'dripping' liquid lithium drops into the plasma edge and vaporization will redistribute the lithium to recoat the PFC during the shot. A theory has been developed for the drop formation and frequency using high-pressure gas. Experiments have been performed initially with Wood's metal and subsequently lithium. Using Wood's metal at a backing pressure of ΔP > 600 torr, frequencies up to f = 1200 Hz have been achieved with droplet diameters d > 600 μm. These agree well with theory. Measurements using lithium also show that the frequency does not quite match the theory with ΔP = 450 torr, a frequency of f = 2 kHz and but the diameters are in good agreement with d = 0.8 mm.

Original languageEnglish (US)
Title of host publication2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013
DOIs
StatePublished - Dec 23 2013
Event2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013 - San Francisco, CA, United States
Duration: Jun 10 2013Jun 14 2013

Publication series

Name2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013

Other

Other2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013
CountryUnited States
CitySan Francisco, CA
Period6/10/136/14/13

ASJC Scopus subject areas

  • Software

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