洞穴ベースのX線源のレーザリング
Patrick Rauer1, Immo Bahns2,3, Bertram Friedrich2
1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. patrick.rauer@desy.de.
Nature
|January 28, 2026
まとめ
研究者らは,ダイヤモンド光学を用いた空洞ベースのX線自由電子レーザー (CBXFEL) を実証した. この突破により,スペクトル的に純粋で高強度のX線パルスが可能になり,先進的なX線科学の応用への道が開けました.
科学分野:
- X線光学によるX線光学
- 加速器の物理学について
- マテリアルサイエンス 材料科学
背景:
- レーザーは可視光学に革命をもたらしたが,これをX線に拡張することは,増幅媒介と鏡で課題に直面した.
- 現在のハードX線自由電子レーザー (XFEL) 装置は,高い明るさを生成しますが,騒音があり,多ピークの時間およびスペクトルプロファイルに苦しんでいます.
- カビティベースのXFEL (CBXFEL) は,フィルターされたX線パルスを同期した空間に再循環させ,スペクトルの純度を向上させることを提案しました.
研究 の 目的:
- 洞穴ベースのXFELセットアップでマルチパスゲインのレージングを実証する.
- 加速器環境におけるX線共振器のためのダイヤモンドブラッグ光学の使用を検証する.
- CBXFELがスペクトル的に純粋なX線パルスを生成する可能性を確立する.
主な方法:
- ヨーロッパのXFELで132.8mのダイヤベースのラウンドトリップブラッグ腔を使用しました.
- 超伝導加速器の2.23MHzの束間隔に穴を同期しました.
- 光学空洞の厳格な長さおよび角安定性要件を維持しました.
主要な成果:
- 6.952 keVでマルチパスゲインのレージングを達成しました.
- 洞穴内の連続した電子束を横断するX線パルスの"リングアップ"を観測した.
- ミクロジュールのレベルのX線パルスを,スペクトル的に純粋に生成した.
結論:
- 本物の加速器環境でCBXFELの実現可能性を確立しました.
- 検証されたダイヤモンドブラッグ光学は,X線共振器に適している.
- 証明されたスペクトル純度は,一貫性のある安定した源を必要とする次世代のX線科学への道を開く.
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