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Title: Initial boronization of PBX-M using ablation of solid boronized probes

Abstract

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.

Authors:
; ; ; ;  [1]; ; ; ; ; ; ; ; ; ;  [2];  [3]
  1. California Univ., Los Angeles, CA (United States). Inst. of Plasma and Fusion Research
  2. Oak Ridge National Lab., TN (United States)
  3. Massachusetts Inst. of Tech., Cambridge, MA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7368683
Report Number(s):
PPPL-2903
ON: DE93014594
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 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; 700420* - Fusion Technology- Plasma-Facing Components- (1992-)

Citation Formats

Kugel, H W, Hirooka, Y, Kaita, R, Kaye, S, Khandagle, M, Timberlake, J, Bell, R, England, A, Isler, R, Okabayashi, M, Paul, S, Takahashi, H, Tighe, W, von Goeler, S, Post-Zwicker, A P, and Jones, S. Initial boronization of PBX-M using ablation of solid boronized probes. United States: N. p., 1993. Web. doi:10.2172/7368683.
Kugel, H W, Hirooka, Y, Kaita, R, Kaye, S, Khandagle, M, Timberlake, J, Bell, R, England, A, Isler, R, Okabayashi, M, Paul, S, Takahashi, H, Tighe, W, von Goeler, S, Post-Zwicker, A P, & Jones, S. Initial boronization of PBX-M using ablation of solid boronized probes. United States. https://doi.org/10.2172/7368683
Kugel, H W, Hirooka, Y, Kaita, R, Kaye, S, Khandagle, M, Timberlake, J, Bell, R, England, A, Isler, R, Okabayashi, M, Paul, S, Takahashi, H, Tighe, W, von Goeler, S, Post-Zwicker, A P, and Jones, S. 1993. "Initial boronization of PBX-M using ablation of solid boronized probes". United States. https://doi.org/10.2172/7368683. https://www.osti.gov/servlets/purl/7368683.
@article{osti_7368683,
title = {Initial boronization of PBX-M using ablation of solid boronized probes},
author = {Kugel, H W and Hirooka, Y and Kaita, R and Kaye, S and Khandagle, M and Timberlake, J and Bell, R and England, A and Isler, R and Okabayashi, M and Paul, S and Takahashi, H and Tighe, W and von Goeler, S and Post-Zwicker, A P and Jones, S},
abstractNote = {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.},
doi = {10.2172/7368683},
url = {https://www.osti.gov/biblio/7368683}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat May 01 00:00:00 EDT 1993},
month = {Sat May 01 00:00:00 EDT 1993}
}