TY - JOUR
T1 - Chemical sputtering studies of lithiated ATJ graphite
AU - Raman, P.
AU - Groll, A.
AU - Fiflis, P.
AU - Curreli, D.
AU - Andruczyk, D.
AU - Ruzic, D. N.
N1 - Funding Information:
Work is supported by Department of Energy/ALPS Contract: DEFG02-99ER54515.
Funding Information:
This work is supported by DOE Contract DE-FG02-04ER54765 . The authors would like to thank Mike Williams for help with experimental set up, Dr. M. Neito for technical discussions.
PY - 2013
Y1 - 2013
N2 - Lithium evaporation treatments in the National Spherical Torus Experiment (NSTX) have shown dramatic improvements in plasma performance increasing the viability of lithium as a Plasma Facing Component (PFC) material. In order to understand the complex system of lithiated ATJ graphite, chemical sputtering measurements of plain and lithiated ATJ graphite are conducted in our upgraded IIAX (Ion Surface Interaction Experiment) facility with a differentially pumped Magnetic Sector Residual Gas Analyzer (MSRGA). Chemical sputtering of graphite is dependent on the ion energy and substrate temperature, hence the effects of treating ATJ graphite with lithium in hydrogen plasma is investigated in terms of different target temperatures and bias voltages. For this purpose, lithium was evaporated in situ onto ATJ graphite and chemically sputtered species in hydrogen plasma were measured using MSRGA. The dominant chemical sputtering product was CH4. Initial experiments show that lithium treatments have suppressed the chemical sputtering of ATJ graphite.
AB - Lithium evaporation treatments in the National Spherical Torus Experiment (NSTX) have shown dramatic improvements in plasma performance increasing the viability of lithium as a Plasma Facing Component (PFC) material. In order to understand the complex system of lithiated ATJ graphite, chemical sputtering measurements of plain and lithiated ATJ graphite are conducted in our upgraded IIAX (Ion Surface Interaction Experiment) facility with a differentially pumped Magnetic Sector Residual Gas Analyzer (MSRGA). Chemical sputtering of graphite is dependent on the ion energy and substrate temperature, hence the effects of treating ATJ graphite with lithium in hydrogen plasma is investigated in terms of different target temperatures and bias voltages. For this purpose, lithium was evaporated in situ onto ATJ graphite and chemically sputtered species in hydrogen plasma were measured using MSRGA. The dominant chemical sputtering product was CH4. Initial experiments show that lithium treatments have suppressed the chemical sputtering of ATJ graphite.
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U2 - 10.1016/j.jnucmat.2013.01.138
DO - 10.1016/j.jnucmat.2013.01.138
M3 - Article
AN - SCOPUS:84885475887
SN - 0022-3115
VL - 438
SP - S655-S658
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - SUPPL
ER -