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Title: Broad ion energy distributions in helicon wave-coupled helium plasma

Abstract

Helium ion energy distributions were measured in the helicon wave-coupled plasma of the DIONISOS experiment with a retarding field energy analyzer. The shape of the energy distribution is double-peaked, characteristic of RF plasma potential modulation. The broad distribution is located within a radius of 0.8 cm while the quartz tube of the plasma source has an inner radius of 2.2 cm. The ion energy distribution rapidly changes from double-peaked to a single peak in the radius range of 0.7 to 0.9 cm. The average ion energy is approximately uniform across the plasma column including the double-peaked and single peak regions. The widths of the broad distribution, dE, in the wave-coupled mode are large compared to the time-averaged ion energy, . On axis (r = 0), dE/ ~ 3.4, and at a radius near the edge of the plasma column (r = 2.2 cm), dE/ ~1.2. The discharge parameter space is scanned to investigate the effects of magnetic field, input power, and chamber fill pressure on the wave-coupled mode that exhibits sharp radial variation in the ion energy distribution.

Authors:
; ;
Publication Date:
DOE Contract Number:  
FC02-99ER54512; SC0002060
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1881218
DOI:
https://doi.org/10.7910/DVN/5RP3KQ

Citation Formats

Woller, K. B., Whyte, D. G., and Wright, G. M. Broad ion energy distributions in helicon wave-coupled helium plasma. United States: N. p., 2019. Web. doi:10.7910/DVN/5RP3KQ.
Woller, K. B., Whyte, D. G., & Wright, G. M. Broad ion energy distributions in helicon wave-coupled helium plasma. United States. doi:https://doi.org/10.7910/DVN/5RP3KQ
Woller, K. B., Whyte, D. G., and Wright, G. M. 2019. "Broad ion energy distributions in helicon wave-coupled helium plasma". United States. doi:https://doi.org/10.7910/DVN/5RP3KQ. https://www.osti.gov/servlets/purl/1881218. Pub date:Fri Jan 11 00:00:00 EST 2019
@article{osti_1881218,
title = {Broad ion energy distributions in helicon wave-coupled helium plasma},
author = {Woller, K. B. and Whyte, D. G. and Wright, G. M.},
abstractNote = {Helium ion energy distributions were measured in the helicon wave-coupled plasma of the DIONISOS experiment with a retarding field energy analyzer. The shape of the energy distribution is double-peaked, characteristic of RF plasma potential modulation. The broad distribution is located within a radius of 0.8 cm while the quartz tube of the plasma source has an inner radius of 2.2 cm. The ion energy distribution rapidly changes from double-peaked to a single peak in the radius range of 0.7 to 0.9 cm. The average ion energy is approximately uniform across the plasma column including the double-peaked and single peak regions. The widths of the broad distribution, dE, in the wave-coupled mode are large compared to the time-averaged ion energy, . On axis (r = 0), dE/ ~ 3.4, and at a radius near the edge of the plasma column (r = 2.2 cm), dE/ ~1.2. The discharge parameter space is scanned to investigate the effects of magnetic field, input power, and chamber fill pressure on the wave-coupled mode that exhibits sharp radial variation in the ion energy distribution.},
doi = {10.7910/DVN/5RP3KQ},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}

Works referencing / citing this record:

Broad ion energy distributions in helicon wave-coupled helium plasma
journal, May 2017