Initial boronization of PBX-M using ablation of solid boronized probes
- California Univ., Los Angeles, CA (United States). Inst. of Plasma and Fusion Research
- Oak Ridge National Lab., TN (United States)
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
The 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.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 7368683
- Report Number(s):
- PPPL-2903; ON: DE93014594
- Country of Publication:
- United States
- Language:
- English
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Initial boronization of PBX-M using ablation from solid boronized probes
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Related Subjects
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
700420* - Fusion Technology- Plasma-Facing Components- (1992-)