| 研究課題/領域番号 |
21K14562
|
|---|
| 研究種目 |
若手研究
|
| 配分区分 | 基金 |
|---|
| 審査区分 |
小区分31010:原子力工学関連
|
|---|
| 研究機関 | 大阪大学 |
|---|
研究代表者 |
EMPIZO MELVIN 大阪大学, レーザー科学研究所, 助教 (70796432)
|
|---|
| 研究期間 (年度) |
2021-04-01 – 2024-03-31
|
| 研究課題ステータス |
交付 (2021年度)
|
| 配分額 *注記 |
4,290千円 (直接経費: 3,300千円、間接経費: 990千円)
2023年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2022年度: 1,560千円 (直接経費: 1,200千円、間接経費: 360千円)
2021年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
|
|---|
| キーワード | Optical material / Crystal growth / Gamma ray / Irradiation / Spectroscopy |
|---|
| 研究開始時の研究の概要 |
Optical windows form a vital part of the plasma diagnostic instruments and the remote inspection and maintenance systems of laser fusion reactors. However, gamma rays produced during or after the fusion reaction could be detrimental to any optical window material due to the fact that ionizing gamma rays can cause bulk and surface damages. In this regard, this research aims to develop Kyropoulos-grown SrB4O7 (SBO) single crystals as gamma-ray radiation-resistant optical window materials.
|
| 研究実績の概要 |
SrBrO7 (SBO) single crystals have been successfully fabricated by Kyropolous growth method using different growth parameters including precursor purity and growth rate. The as-grown crystals were subsequently characterized using analytical techniques such as optical microscopy, vacuum ultraviolet (VUV) transmittance spectroscopy, and x-ray diffraction spectroscopy. Laser-induced damage investigations have also been performed through single-shot and multi-shot irradiation. High-quality, b-axis-oriented SBO single crystals with 100-mm dimensions (large), up to 80 % VUV transmittances, and high deep ultraviolet (DUV) laser-induced damage resistance have been successfully prepared by Kyropolous growth method. These results have already been submitted for publication with one paper just recently been accepted and the other under review.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The research aim of fabricating more than 60-mm SBO crystals and one out of three scientific publications have been achieved. The laser-induced damage of the Kyropolous-grown crystals has also been investigated under single-shot and multi-shot irradiation.
|
| 今後の研究の推進方策 |
In the next fiscal year, the Kyropoulos-grown SBO single crystals will be irradiated with gamma rays from a cobalt-60 source. The irradiation will be carried out with different absorbed doses, and the crystals' structural and optical properties will be evaluated using a variety of characterization techniques. Gamma-ray irradiation effects on the crystals properties will be determined by comparing the results before and after irradiation. The changes in the crystal properties will likewise be examined in relation to the absorbed doses. Detailed analysis is crucial in understanding the damage formation mechanisms in order to improve the Kyropoulos growth method for the fabrication of radiation-resistant SBO single crystals.
|
