Neutralization processes of atomic/molecular deuterium ions assisted by ND3 in low density D2-N2 plasmas

Abe, S.; Doerner, R. P.; Tynan, G. R.

doi:10.1063/1.5037602

Title: Neutralization processes of atomic/molecular deuterium ions assisted by ND₃ in low density D₂-N₂ plasmas

Journal Article · 11 July 2018 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5037602 · OSTI ID:1540223

Abe, S. ^[1]; Doerner, R. P. ^[2];

^[2]

Univ. of California, San Diego, CA (United States); DOE/OSTI
Univ. of California, San Diego, CA (United States)

The formation mechanisms of ND₃⁺ and ND₄⁺ are investigated in weakly ionized nitrogen-hydrogen plasmas with electron densities n_e ~ 10¹⁶ m^-3 and electron temperatures T_e ~ 3 eV. The plasmas are created by an inductively coupled RF (13.56 MHz) discharge of 500 W at the total pressure of 10 mTorr in the nitrogen partial pressure ranging from 0.02 to 2.9 mTorr. The ion density fractions are measured by an electrostatic quadrupole plasma analyzer, which is a combination of ion energy analyzer and mass spectrometer, after calibration with neutral gases. A zero-dimensional rate equation model, sometimes called a global model, is used to understand the source and loss processes of each ion and neutral species in the plasma. The ion density fractions calculated by the model show qualitatively good agreement with the experimental results. Model calculations suggest that ND₃⁺ and ND₄⁺ generation is dominated by electron or D⁺ exchange reactions of deuterium atomic/molecular ions with ND₃. These processes are thought to play an important role in the recombination process of D plasma with ammonia formed in the N₂ seeded divertor region.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER54912

OSTI ID:: 1540223

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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