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Electron self-energy corrections using the Welton concept for atomic structure calculations. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Measurement of the scalar curvature of high-power lasers. Sci Rep 2022; 12:18057. [PMID: 36302885 DOI: 10.1038/s41598-022-23045-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 10/25/2022] [Indexed: 11/09/2022] Open
Abstract
High-power lasers develop high energy per unit time, and as energy curves space, we expect atomic energy levels to change. The fluorescence spectrum is a good measurement of the matrix elements involved in the Rabi oscillation and consequently allows us to determine the scalar curvature. At high Z, electrons oppose ionization even for strong intensities. Because high-power lasers address relativistic atoms, the wave functions involved must be solutions of the Dirac equation in a curved space-time. The paper can be seen as a way to check whether the Einstein's gravitational theory is valid in the dimension of laboratory.
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Salhi DE, Ben Nasr S, Jelassi H. MCDHF/RCI extended calculations of energy levels, radiative properties, AJ, BJ hyperfine interaction constants, and Landé gJ-factors for Ar XVII. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yang Y, Xiao J, Lu D, Shen Y, Yao K, Chen C, Hutton R, Zou Y. A high precision flat crystal spectrometer compatible for ultra-high vacuum light source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:113108. [PMID: 29195414 DOI: 10.1063/1.5010995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on a flat crystal spectrometer (FCS) featuring a differently pumped rotary feedthrough and double detectors connected to a crystal chamber by extendable bellows built at the Shanghai EBIT Laboratory. It was designed to overcome defects such as oil contamination, little distance from the detector to the crystal and others of an early FCS equipped at the same laboratory, but still keeps a large detectable angle range of detectors and brings new features and functions such as the Bond method measurement and double-crystal measurement which are based on the two-detector and large bellow design. This new FCS could cover an energy range of measurable photons from 570 eV to 10 keV and reach a vacuum better than 6 × 10-10 Torr and thus is compatible for coupling directly to ultra-high vacuum light sources. Off-line tests of the FCS were undertaken where Kα x-rays from solid titanium were measured and analyzed. Measurements of transitions in He-like argon ions were performed when the spectrometer was directly connected to Shanghai EBIT, and the width of the x-ray source was monitored simultaneously using an x-ray slit imaging system. An observed spectral line broadening was 0.869 eV corresponding to a resolving power of 3600, including Doppler broadening of the x-ray source. Taking account of the measured source width, we made simulations using the SHADOW 3 code and got a nominal resolving power of 6500 for the spectrometer. This high nominal resolving power is due to a longer distance from the crystal to the detector, comparing with that in the early FCS.
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Affiliation(s)
- Y Yang
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - J Xiao
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - D Lu
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - Y Shen
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - K Yao
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - C Chen
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - R Hutton
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - Y Zou
- Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, China
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Beiersdorfer P, Magee EW, Hell N, Brown GV. Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E339. [PMID: 27910570 DOI: 10.1063/1.4962049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We describe a crystal spectrometer implemented on the Livermore electron beam ion traps that employ two spherically bent quartz crystals and a cryogenically cooled back-illuminated charge-coupled device detector to measure x rays with a nominal resolving power of λ/Δλ ≥ 10 000. Its focusing properties allow us to record x rays either with the plane of dispersion perpendicular or parallel to the electron beam and, thus, to preferentially select one of the two linear x-ray polarization components. Moreover, by choice of dispersion plane and focussing conditions, we use the instrument either to image the distribution of the ions within the 2 cm long trap region, or to concentrate x rays of a given energy to a point on the detector, which optimizes the signal-to-noise ratio. We demonstrate the operation and utility of the new instrument by presenting spectra of Mo34+, which prepares the instrument for use as a core impurity diagnostic on the NSTX-U spherical torus and other magnetic fusion devices that employ molybdenum as plasma facing components.
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Affiliation(s)
- P Beiersdorfer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E W Magee
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Hell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G V Brown
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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A vacuum double-crystal spectrometer for reference-free X-ray spectroscopy of highly charged ions. Radiat Phys Chem Oxf Engl 1993 2014. [DOI: 10.1016/j.radphyschem.2014.01.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chantler CT, Kinnane MN, Gillaspy JD, Hudson LT, Payne AT, Smale LF, Henins A, Pomeroy JM, Kimpton JA, Takacs E, Makonyi K. Chantler et al. reply. PHYSICAL REVIEW LETTERS 2013; 110:159302. [PMID: 25167322 DOI: 10.1103/physrevlett.110.159302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Indexed: 06/03/2023]
Affiliation(s)
- C T Chantler
- School of Physics, The University of Melbourne, Australia
| | - M N Kinnane
- School of Physics, The University of Melbourne, Australia and National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J D Gillaspy
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - L T Hudson
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - A T Payne
- School of Physics, The University of Melbourne, Australia
| | - L F Smale
- School of Physics, The University of Melbourne, Australia
| | - A Henins
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J M Pomeroy
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J A Kimpton
- School of Physics, The University of Melbourne, Australia and Australian Synchrotron, Melbourne, Victoria 3000, Australia
| | - E Takacs
- Experimental Physics Department, University of Debrecen, Bem ter 18/A, Debrecen 4028, Hungary
| | - K Makonyi
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Epp SW. Comment on "Testing three-body quantum electrodynamics with trapped Ti20+ ions: evidence for a Z-dependent divergence between experiment and calculation". PHYSICAL REVIEW LETTERS 2013; 110:159301. [PMID: 25167321 DOI: 10.1103/physrevlett.110.159301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Indexed: 06/03/2023]
Affiliation(s)
- S W Epp
- Max Planck Advanced Study Group, Center for Free-Electron Laser Science, 22607 Hamburg, Germany and Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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Amaro P, Schlesser S, Guerra M, Le Bigot EO, Isac JM, Travers P, Santos JP, Szabo CI, Gumberidze A, Indelicato P. Absolute measurement of the relativistic magnetic dipole transition energy in heliumlike argon. PHYSICAL REVIEW LETTERS 2012; 109:043005. [PMID: 23006085 DOI: 10.1103/physrevlett.109.043005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Indexed: 05/22/2023]
Abstract
The 1s2s (3)S(1)→1s(2) (1)S(0) relativistic magnetic dipole transition in heliumlike argon, emitted by the plasma of an electron-cyclotron resonance ion source, has been measured using a double-flat crystal x-ray spectrometer. Such a spectrometer, used for the first time on a highly charged ion transition, provides absolute (reference-free) measurements in the x-ray domain. We find a transition energy of 3104.1605(77) eV (2.5 ppm accuracy). This value is the most accurate, reference-free measurement done for such a transition and is in good agreement with recent QED predictions.
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Affiliation(s)
- Pedro Amaro
- Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Université Pierre et Marie Curie-Paris 6, Case 74, 4 Place Jussieu, F-75005 Paris, France
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