TY  - JOUR
AU  - Szypryt, P.
AU  - O'Neil, G. C.
AU  - Takács, Endre
AU  - Tan, J. N.
AU  - Buechele, S. W.
AU  - Naing, A. S.
AU  - Bennett, D. A.
AU  - Doriese, W. B.
AU  - Durkin, M.
AU  - Fowler, J. W.
AU  - Gard, J. D.
AU  - Hilton, G. C.
AU  - Morgan, K. M.
AU  - Reintsema, C. D.
AU  - Schmidt, D. R.
AU  - Swetz, D. S.
AU  - Ullom, J. N.
AU  - Ralchenko, Yu.
TI  - A transition-edge sensor-based x-ray spectrometer for the study of highly charged ions at the National Institute of Standards and Technology electron beam ion trap
JF  - REVIEW OF SCIENTIFIC INSTRUMENTS
J2  - REV SCI INSTRUM
VL  - 90
PY  - 2019
IS  - 12
PG  - 19
SN  - 0034-6748
DO  - 10.1063/1.5116717
UR  - https://m2.mtmt.hu/api/publication/31101528
ID  - 31101528
AB  - We report on the design, commissioning, and initial measurements of a Transition-Edge Sensor (TES) x-ray spectrometer for the Electron Beam Ion Trap (EBIT) at the National Institute of Standards and Technology (NIST). Over the past few decades, the NIST EBIT has produced numerous studies of highly charged ions in diverse fields such as atomic physics, plasma spectroscopy, and laboratory astrophysics. The newly commissioned NIST EBIT TES Spectrometer (NETS) improves the measurement capabilities of the EBIT through a combination of high x-ray collection efficiency and resolving power. NETS utilizes 192 individual TES x-ray microcalorimeters (166/192 yield) to improve upon the collection area by a factor of similar to 30 over the 4-pixel neutron transmutation doped germanium-based microcalorimeter spectrometer previously used at the NIST EBIT. The NETS microcalorimeters are optimized for the x-ray energies from roughly 500 eV to 8000 eV and achieve an energy resolution of 3.7 eV-5.0 eV over this range, a more modest (<2x) improvement over the previous microcalorimeters. Beyond this energy range, NETS can operate with various trade-offs, the most significant of which are reduced efficiency at lower energies and being limited to a subset of the pixels at higher energies. As an initial demonstration of the capabilities of NETS, we measured transitions in He-like and H-like O, Ne, and Ar as well as Ni-like W. We detail the energy calibration and data analysis techniques used to transform detector counts into x-ray spectra, a process that will be the basis for analyzing future data.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Gall, A.C.
AU  - Foster, A.R.
AU  - Silwal, R.
AU  - Dreiling, J.M.
AU  - Borovik, A.
AU  - Kilgore, E.
AU  - Ajello, M.
AU  - Gillaspy, J.D.
AU  - Ralchenko, Y.
AU  - Takács, Endre
TI  - EBIT Observation of Ar Dielectronic Recombination Lines near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters
JF  - ASTROPHYSICAL JOURNAL
J2  - ASTROPHYS J
VL  - 872
PY  - 2019
IS  - 2
SN  - 1538-4357
DO  - 10.3847/1538-4357/ab0177
UR  - https://m2.mtmt.hu/api/publication/30932613
ID  - 30932613
N1  - Clemson University, Department of Physics and Astronomy, Clemson, 29634-0978, United States            
            Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States            
            National Institute of Standards and Technology, Gaithersburg, MD 20899, United States            
            I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Giessen, D-35392, Germany            
            National Science Foundation, Alexandria, VA 22314, United States            
            Cited By :1            
            Export Date: 26 November 2019
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Sanders, S. C.
AU  - Silwal, R.
AU  - Rudramadevi, B. H.
AU  - Gall, A. C.
AU  - Takács, Endre
TI  - High-resolution X-ray spectroscopy of highly charged tungsten EBIT plasma
JF  - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
J2  - NUCL INSTRUM METH B
VL  - 431
PY  - 2018
SP  - 47
EP  - 54
PG  - 8
SN  - 0168-583X
DO  - 10.1016/j.nimb.2018.06.013
UR  - https://m2.mtmt.hu/api/publication/30498730
ID  - 30498730
AB  - Highly charged tungsten transitions can be used as a diagnostic tool for investigating performance of the fusion device. Systematic spectroscopic investigations of the radiative decay channels of the tungsten charge states allow for extending the fundamental understanding of highly charged ions and can serve as a diagnostic tool to improve applied plasma research. Electron beam ion traps (EBIT) offer the ability to generate emission from highly charged tungsten ions because of their charge state and excitation selectivity due to their quasi-mono-energetic electron beam. In this work, we report the current experimental capabilities of the EBIT at the National Institute of Standards and Technology (NIST). High-resolution measurements of EUV and x-ray transitions from tungsten charge states are shown, demonstrating our ability to produce and identify the spectral features of highly charged tungsten plasma. While the experimental results were limited by the lack of an absolute calibration of the spectrometer, we present approximate transition energies of two strong transitions from the Ti-like W52+ and Sc-like W53+ charge states. Our estimates agree quite well with the results of FAC simulations, where these strongest transitions were identified to originate from 3d-4f transitions. This decay channel has been shown to be the strongest transition for surrounding charge states.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Silwal, R.
AU  - Lapierre, A.
AU  - Gillaspy, J. D.
AU  - Dreiling, J. M.
AU  - Blundell, S. A.
AU  - Dipti, .
AU  - Borovik, A.
AU  - Gwinner, G.
AU  - Villari, A. C. C.
AU  - Ralchenko, Yu
AU  - Takács, Endre
TI  - Measuring the difference in nuclear charge radius of Xe isotopes by EUV spectroscopy of highly charged Na-like ions
JF  - PHYSICAL REVIEW A
J2  - PHYS REV A
VL  - 98
PY  - 2018
IS  - 5
PG  - 6
SN  - 2469-9926
DO  - 10.1103/PhysRevA.98.052502
UR  - https://m2.mtmt.hu/api/publication/30498728
ID  - 30498728
AB  - The difference in the mean-square nuclear charge radius of xenon isotopes was measured utilizing a method based on extreme ultraviolet spectroscopy of highly charged Na-like ions. The isotope shift of the Na-like D1 (3s(2)S(1/2) - 3(P)(2)P(1/2)) transition between the Xe-124 and Xe-136 isotopes was experimentally determined using the electron-beam ion-trap facility at the National Institute of Standards and Technology. The mass-shift and the field-shift coefficients were calculated with enhanced precision by the relativistic many-body perturbation theory and multiconfiguration Dirac-Hartree-Fock method. The mean-square nuclear charge radius difference was found to be delta < r(2)>(136,124) = 0.269(42) fm(2). Our result has smaller uncertainty than previous experimental results and agrees with the literature values.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Sengupta, Bishwambhar
AU  - Gulyas, Laszlo
AU  - Medlin, Donald
AU  - Koroknai, Tibor
AU  - Takacs, David
AU  - Filep, Gyorgy
AU  - Panko, Peter
AU  - Godo, Bence
AU  - Hollo, Tamas
AU  - Zheng, Xiao Ran
AU  - Fedorcsak, Imre
AU  - Dobai, Jozsef
AU  - Bognar, Laszlo
AU  - Takács, Endre
TI  - Intensity modulated operating mode of the rotating gamma system
JF  - MEDICAL PHYSICS
J2  - MED PHYS
VL  - 45
PY  - 2018
IS  - 5
SP  - 2289
EP  - 2298
PG  - 10
SN  - 0094-2405
DO  - 10.1002/mp.12887
UR  - https://m2.mtmt.hu/api/publication/27539265
ID  - 27539265
N1  - Export Date: 20 December 2018            
            CODEN: MPHYA
Export Date: 26 December 2018            
            CODEN: MPHYA
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Roshani, Silwal
AU  - Takács, Endre
AU  - Joan, M Dreiling
AU  - John, D Gillaspy
AU  - Yuri, Ralchenko
TI  - Identification and Plasma Diagnostics Study of Extreme Ultraviolet Transitions in Highly Charged Yttrium
JF  - ATOMS
J2  - ATOMS
VL  - 5
PY  - 2017
IS  - 3
SP  - 30
EP  - 52
PG  - 22
SN  - 2218-2004
DO  - 10.3390/atoms5030030
UR  - https://m2.mtmt.hu/api/publication/3308986
ID  - 3308986
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Opposits, Gábor
AU  - Kis, Sándor Attila
AU  - Trón, Lajos
AU  - Berényi, Ervin László
AU  - Takács, Endre
AU  - Dobai, JG
AU  - Bognár, László
AU  - Szucs, B
AU  - Emri, Miklós
TI  - Population based ranking of frameless CT-MRI registration methods [Quantifizierung der Qualität von Methoden zur Registrierung von CT- und MRT-Bildern unter Verwendung von Bilddaten eines großen Patientenkollektivs]
JF  - ZEITSCHRIFT FUR MEDIZINISCHE PHYSIK
J2  - Z MED PHYS
VL  - 25
PY  - 2015
IS  - 4
SP  - 353
EP  - 367
PG  - 15
SN  - 0939-3889
DO  - 10.1016/j.zemedi.2015.07.001
UR  - https://m2.mtmt.hu/api/publication/2948571
ID  - 2948571
AB  - BACKGROUND: Clinical practice often requires simultaneous information obtained by two different imaging modalities. Registration algorithms are commonly used for this purpose. Automated procedures are very helpful in cases when the same kind of registration has to be performed on images of a high number of subjects. Radiotherapists would prefer to use the best automated method to assist therapy planning, however there are not accepted procedures for ranking the different registration algorithms. PURPOSE: We were interested in developing a method to measure the population level performance of CT-MRI registration algorithms by a parameter of values in the [0,1] interval. MATERIALS AND METHODS: Pairs of CT and MRI images were collected from 1051 subjects. Results of an automated registration were corrected manually until a radiologist and a neurosurgeon expert both accepted the result as good. This way 1051 registered MRI images were produced by the same pair of experts to be used as gold standards for the evaluation of the performance of other registration algorithms. Pearson correlation coefficient, mutual information, normalized mutual information, Kullback-Leibler divergence, L1 norm and square L2 norm (dis)similarity measures were tested for sensitivity to indicate the extent of (dis)similarity of a pair of individual mismatched images. RESULTS: The square Hellinger distance proved suitable to grade the performance of registration algorithms at population level providing the developers with a valuable tool to rank algorithms. CONCLUSIONS: The developed procedure provides an objective method to find the registration algorithm performing the best on the population level out of newly constructed or available preselected ones.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Takács, Endre
AU  - Kimmel, T D
AU  - Brandenburg, K H
AU  - Wilson, R K
AU  - Gall, A C
AU  - Harriss, J E
AU  - Sosolik, C E
TI  - Diagnostic Measurements of CUEBIT Based on the Dielectronic Resonance Process
JF  - AIP CONFERENCE PROCEEDINGS
J2  - AIP CONF PROC
VL  - 1640
PY  - 2015
SP  - 154
EP  - 160
PG  - 7
SN  - 0094-243X
DO  - 10.1063/1.4905414
UR  - https://m2.mtmt.hu/api/publication/2888311
ID  - 2888311
N1  - WoS:hiba:000347721900022 2019-03-09 13:31 típus nem egyezik
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Payne, A T
AU  - Chantler, C T
AU  - Kinnane, M N
AU  - Gillaspy, J D
AU  - Hudson, L T
AU  - Smale, L F
AU  - Henins, A
AU  - Kimpton, J A
AU  - Takács, Endre
TI  - Helium-like titanium x-ray spectrum as a probe of QED computation
JF  - JOURNAL OF PHYSICS B: ATOMIC MOLECULAR AND OPTICAL PHYSICS
J2  - J PHYS B AT MOL OPT PH
VL  - 47
PY  - 2014
IS  - 18
PG  - 8
SN  - 0953-4075
DO  - 10.1088/0953-4075/47/18/185001
UR  - https://m2.mtmt.hu/api/publication/2888313
ID  - 2888313
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Chantler, C T
AU  - Payne, A T
AU  - Gillaspy, J D
AU  - Hudson, L T
AU  - Smale, L F
AU  - Henins, A
AU  - Kimpton, J A
AU  - Takács, Endre
TI  - X-ray measurements in helium-like atoms increased discrepancy between experiment and theoretical QED
JF  - NEW JOURNAL OF PHYSICS
J2  - NEW J PHYS
VL  - 16
PY  - 2014
IS  - 12
PG  - 15
SN  - 1367-2630
DO  - 10.1088/1367-2630/16/12/123037
UR  - https://m2.mtmt.hu/api/publication/2888312
ID  - 2888312
LA  - English
DB  - MTMT
ER  -