2025.04.04

核融合科学研究所（NIFS）プラズマ量子プロセス（PQP）ユニットでは、ユニットの研究活動を広く発信していくために、セミナーを開催しております。今回は、講師としてクレムゾン大学のエンドレ・タカーチ先生をお招きし「State-of-the-art x-ray microcalorimeter for studying QED effects in highly charged ions」と題してご講演いただきます。

【実施要項】

題目：State-of-the-art x-ray microcalorimeter for studying QED effects in highly charged ions

講師：エンドレ・タカーチ（クレムゾン大学、アメリカ合衆国）、NIFSプラズマ量子プロセスユニット客員教授　

日時：2025年4月10日 (木)

　　　14:00-15:00 （ハイブリッド開催）

会場：核融合科学研究所 研究１期棟5階501号室 およびZoom（要登録）

＊Zoom接続情報は別途メールの案内に記載

【概要】

Quantum electrodynamics (QED) is one of the most accurate theories of fundamental interactions, and its extraordinary precision provides unique opportunities for scientific discovery, such as the search for new physics. Consequently, stringent experimental tests of QED remain of high importance. Highly charged ions serve as an exceptional test bed due to their enhanced QED effects.
　A Transition-Edge Sensor (TES) x-ray microcalorimeter array was recently commissioned at the Electron Beam Ion Trap (EBIT) at the National Institute of Standards and Technology (NIST) to study these effects. Over the past few decades, the NIST EBIT has produced numerous studies on highly charged ions across diverse fields such as atomic physics, plasma spectroscopy, and laboratory astrophysics. The x-ray microcalorimeter combines high x-ray collection efficiency with excellent resolving power, utilizing 192 individual pixels optimized for x-ray energies ranging from roughly 500 eV to 10,000 eV, achieving an energy resolution of 3.7 eV–5.0 eV over this range.
　Recent measurements that leverage the capabilities of this state-of-the-art instrument will be reported. These include precise (to the ppm level) measurements of forbidden transitions in F-like ions, the observation of ladder ionization from Ni-like metastable levels, and the detection of prominent Ne-like transitions in heavy elements.

【連絡先】

坂上裕之：sakaue.hiroyuki(at)nifs.ac.jp

※(at) を＠に直してください。