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DOI 10.2172/7368683
Title Initial boronization of PBX-M using ablation of solid boronized probes
Creator/Author Kugel, H.W. ; Hirooka, Y. ; Kaita, R. ; Kaye, S. ; Khandagle, M. (California Univ., Los Angeles, CA (United States). Inst. of Plasma and Fusion Research) ; Timberlake, J. ; Bell, R. ; England, A. ; Isler, R. ; Okabayashi, M. ; Paul, S. ; Takahashi, H. ; Tighe, W. ; von Goeler, S. ; Post-Zwicker, A.P. (Oak Ridge National Lab., TN (United States)) ; Jones, S. (Massachusetts Inst. of Tech., Cambridge, MA (United States))
Publication Date1993 May 01
OSTI IdentifierOSTI ID: 7368683; Legacy ID: DE93014594
Report Number(s)PPPL-2903
DOE Contract NumberAC02-76CH03073
Other Number(s)Other: ON: DE93014594
Resource TypeTechnical Report
Research OrgPrinceton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring OrgDOE; USDOE, Washington, DC (United States)
Subject70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BORON CARBIDES; DEPOSITION; PLASMA IMPURITIES; CONTROL; ABLATION; BORON; COMPACT IGNITION TOKAMAK; GRAPHITE; PROBES; BORON COMPOUNDS; CARBIDES; CARBON; CARBON COMPOUNDS; CLOSED PLASMA DEVICES; ELEMENTAL MINERALS; ELEMENTS; IMPURITIES; MINERALS; NONMETALS; SEMIMETALS; THERMONUCLEAR DEVICES; THERMONUCLEAR REACTORS; TOKAMAK DEVICES; TOKAMAK TYPE REACTORS
Description/AbstractThe initial boronization of PBX-M was performed using the sequential ablation of two types of solid target probes. Probe-1 in a mushroom shape consisted of a 10.7% boronized 2-D C-C composite containing 3.6 g of boron in a B[sub 4]C binder. Probe-2 in a rectangular shape consisted of an 86% boronized graphite felt composite containing 19.5 g of 40 [mu] boron particles. After boronization with Probe-1, the loop voltage during 1 MW neutral beam heated plasmas decreased 27% and volt-sec consumption decreased 20%. Strong peripheral spectral lines from low-Z elements decreased by factors of about 5. The central oxygen density decreased 15--20%. The total radiated power during neutral beam injection decreased by 43%. Probe-2 boronization exhibited improved operating conditions similar to Probe-1, but for some parameters, a smaller percentage change occurred due to the residual boron from the previous boronization using Probe-1. The ablation rates of both probes were consistent with front face temperatures at or slightly above the boron melting point. These results confirm the effectiveness of the solid target boronization (STB) technique as a real-time impurity control method for replenishing boron depositions without the use of hazardous borane compounds.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: ED; Size: Pages: (40 p)
AvailabilityOSTI; NTIS; INIS; GPO Dep.
System Entry Date2008 Jun 30

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