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A study of molybdenum influxes and transport in alcator C-Mod

Publication ,  Journal Article
Lipschultz, B; Pappas, DA; Labombard, B; Rice, JE; Smith, D; Wukitch, SJ
Published in: Nuclear Fusion
May 1, 2001

A characterization is presented of Mo sources ΓMo, core Mo content NMo and their dependences on the Alcator C-Mod operational regimes. The primary impurity source locations are the divertor, the inner wall and the ICRF antenna limiters. Boronization is used to coat the first wall surfaces with a thin layer of B, which greatly reduces the Mo sources for a period of time, eroding away with an e folding period of 15-50 discharges. The penetration of Mo into the core plasma under different conditions is analysed using the concept of penetration factor, PF = NMo/ΓMo (s). In general, the inner wall Mo source is large (∼1018 s-1), but is found to be relatively uncorrelated with the core Mo content in diverted plasmas. The outer divertor source is of a similar order to that of the inner wail and has a penetration factor in the range 10-5-2 ∼ 10-3 s depending on density and confinement mode. The antenna limiter Mo sources are typically smaller, but with higher penetration factors of 10-3-2 × 10-2 s. The behaviour of the antenna limiter sources is consistent with physical sputtering due to the influence of RF sheath rectification. The measurements of the plasma potential on feld lines connected to the antenna are very high when the antennas are energized, often reaching hundreds of volts.

Duke Scholars

Published In

Nuclear Fusion

DOI

ISSN

0029-5515

Publication Date

May 1, 2001

Volume

41

Issue

5

Start / End Page

585 / 596

Related Subject Headings

  • Fluids & Plasmas
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Lipschultz, B., Pappas, D. A., Labombard, B., Rice, J. E., Smith, D., & Wukitch, S. J. (2001). A study of molybdenum influxes and transport in alcator C-Mod. Nuclear Fusion, 41(5), 585–596. https://doi.org/10.1088/0029-5515/41/5/311
Lipschultz, B., D. A. Pappas, B. Labombard, J. E. Rice, D. Smith, and S. J. Wukitch. “A study of molybdenum influxes and transport in alcator C-Mod.” Nuclear Fusion 41, no. 5 (May 1, 2001): 585–96. https://doi.org/10.1088/0029-5515/41/5/311.
Lipschultz B, Pappas DA, Labombard B, Rice JE, Smith D, Wukitch SJ. A study of molybdenum influxes and transport in alcator C-Mod. Nuclear Fusion. 2001 May 1;41(5):585–96.
Lipschultz, B., et al. “A study of molybdenum influxes and transport in alcator C-Mod.” Nuclear Fusion, vol. 41, no. 5, May 2001, pp. 585–96. Scopus, doi:10.1088/0029-5515/41/5/311.
Lipschultz B, Pappas DA, Labombard B, Rice JE, Smith D, Wukitch SJ. A study of molybdenum influxes and transport in alcator C-Mod. Nuclear Fusion. 2001 May 1;41(5):585–596.
Journal cover image

Published In

Nuclear Fusion

DOI

ISSN

0029-5515

Publication Date

May 1, 2001

Volume

41

Issue

5

Start / End Page

585 / 596

Related Subject Headings

  • Fluids & Plasmas
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics