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116 results on '"Walther, Th."'

1. Laser spectroscopy of highly charged ions at the storage ring CSRe: Schottky-based spectroscopic investigation and XUV fluorescence detector development

Author

Chen, D.Y., Wang, H.B., Wen, W.Q., Huang, Z.K., Zhang, D.C., Yuan, Y.J., Winters, D., Klammes, S., Kiefer, D., Walther, Th., Loeser, M., Siebold, M., Yan, K.M., Li, J., Tang, M.T., Wu, J.X., Yin, D.Y., Lin, F.P., Yang, J.J., Mao, L.J., Yang, J.C., Zhang, S.F., Schramm, U., Bussmann, M., and Ma, X.

Published
2024
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2. Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization

Author

Fitzke, E., Krebs, R., Haase, Th., Mengler, M., Alber, G., and Walther, Th.

Subjects
Quantum Physics, Physics - Instrumentation and Detectors, Physics - Optics
Abstract

We report on the first realization of time-dependent quantum detector tomography for commercially available InGaAs avalanche photo detectors. For the construction of appropriate time-dependent POVMs from experimentally measured data, we introduce a novel scheme to calculate the weight of the regularization term based on the amount of measured data. We compare our POVM-based results with the theoretical predictions of the previously developed model by Gouzien et al. In contrast to our measurement-based construction of a time-dependent POVM for photon detectors, this previous investigation extends a time-independent POVM to a time-dependent one by including effects of detector timing jitter and dead time on the basis of particular model assumptions concerning the inner physical mechanisms of a photon detector. Our experimental results demonstrate that this latter approach is not sufficient to completely describe the observable properties of our InGaAs avalanche photo detectors. Thus, constructing the time-dependent POVM of a detector by direct quantum tomographic measurements can reveal information about the detector's interior that may not easily be included in time-independent POVMs by a priori model assumptions., Comment: 21 pages, 7 figures

Published
2021
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6. Publisher Correction: Laser spectroscopy of the 2S1/2-2P1/22P3/2C3+, 2S1/2-2P1/22P3/2C3+ transitions in stored and cooled relativistic 2S1/2-2P1/22P3/2C3+ ions

Author

Winzen, D., Hannen, V., Bussmann, M., Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., Kühl, Th., Loeser, M., Ma, X., Nörtershäuser, W., Ortjohann, H.-W., Sánchez, R., Siebold, M., Stöhlker, Th., Ullmann, J., Vollbrecht, J., Walther, Th., Wang, H., Weinheimer, Ch., and Winters, D. F. A.

Published
2021
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7. Measurement of the lifetime and the proportion of 12C3+ ions in stored relativistic ion beams as a preparation for laser cooling experiments at the CSRe

Author

Wang, H.B., Wen, W.Q., Huang, Z.K., Zhang, D.C., Hai, B., Zhu, X.L., Zhao, D.M., Yang, J., Li, J., Li, X.N., Mao, L.J., Mao, R.S., Wu, J.X., Yang, J.C., Yuan, Y.J., Eidam, L., Winters, D., Beck, T., Kiefer, D., Rein, B., Walther, Th., Loeser, M., Schramm, U., Siebold, M., Bussmann, M., and Ma, X.

Published
2017
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13. Laser spectroscopy of the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$\end{document}2S1/2-2P1/2, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^2{\mathrm{P}}_{3/2}$$\end{document}2P3/2 transitions in stored and cooled relativistic C\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{3+}$$\end{document}3+ ions

Author

Winzen, D., Hannen, V., Bussmann, M., Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., Kühl, Th., Loeser, M., Ma, X., Nörtershäuser, W., Ortjohann, H.-W., Sánchez, R., Siebold, M., Stöhlker, Th., Ullmann, J., Vollbrecht, J., Walther, Th., Wang, H., Weinheimer, Ch., and Winters, D. F. A.

Subjects
Atomic and molecular physics, Article, Techniques and instrumentation
Abstract

The \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$\end{document}2S1/2-2P1/2 and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{3}/2}$$\end{document}2S1/2-2P3/2 transitions in Li-like carbon ions stored and cooled at a velocity of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta \approx 0.47$$\end{document}β≈0.47 in the experimental storage ring (ESR) at the GSI Helmholtz Centre in Darmstadt have been investigated in a laser spectroscopy experiment. Resonance wavelengths were obtained using a new continuous-wave UV laser system and a novel extreme UV (XUV) detection system to detect forward emitted fluorescence photons. The results obtained for the two transitions are compared to existing experimental and theoretical data. A discrepancy found in an earlier laser spectroscopy measurement at the ESR with results from plasma spectroscopy and interferometry has been resolved and agreement between experiment and theory is confirmed.

Published
2021

14. Publisher Correction: Laser spectroscopy of the $$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$, $$^2{\mathrm{P}}_{3/2}$$ transitions in stored and cooled relativistic $${\text{C}}^{3+}$$ ions

Author

Winzen, D., primary, Hannen, V., additional, Bussmann, M., additional, Buß, A., additional, Egelkamp, C., additional, Eidam, L., additional, Huang, Z., additional, Kiefer, D., additional, Klammes, S., additional, Kühl, Th., additional, Loeser, M., additional, Ma, X., additional, Nörtershäuser, W., additional, Ortjohann, H.-W., additional, Sánchez, R., additional, Siebold, M., additional, Stöhlker, Th., additional, Ullmann, J., additional, Vollbrecht, J., additional, Walther, Th., additional, Wang, H., additional, Weinheimer, Ch., additional, and Winters, D. F. A., additional

Published
2021
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15. Laser spectroscopy of the $^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$, $$^2{\mathrm{P}}_{3/2}$ transitions in stored and cooled relativistic C$_{3+}$ ions

Author

Winzen, D., Hannen, V., Loeser, M., Ma, X., Nörtershäuser, W., Ortjohann, H.-W., Sanchez Alarcon, Rodolfo Marcelo, Siebold, M., Stöhlker, Th., Ullmann, J., Vollbrecht, J., Walther, Th., Bussmann, M., Wang, H., Weinheimer, Ch., Winters, Danyal, Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., and Kühl, Th.

Subjects
ddc:600
Abstract

Scientific reports 11(1), 9370 (2021). doi:10.1038/s41598-021-88926-w, Published by Macmillan Publishers Limited, part of Springer Nature, [London]

Published
2021
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16. Publisher Correction: Laser spectroscopy of the $^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$, $$^2{\mathrm{P}}_{3/2}$ transitions in stored and cooled relativistic C$^{3+}$ ions

Author

Winzen, D., Hannen, V., Loeser, M., Ma, X., Nörtershäuser, Wilfried, Ortjohann, H.-W., Sanchez Alarcon, Rodolfo Marcelo, Siebold, M., Stöhlker, Th., Ullmann, J., Vollbrecht, J., Walther, Th., Bussmann, M., Wang, H., Weinheimer, Ch., Winters, Danyal, Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., and Kühl, Th.

Subjects
ddc:600
Abstract

Scientific reports 11(1), 17660 (2021). doi:10.1038/s41598-021-97511-0, Published by Macmillan Publishers Limited, part of Springer Nature, [London]

Published
2021
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17. Laser spectroscopy of the $$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$, $$^2{\mathrm{P}}_{3/2}$$ transitions in stored and cooled relativistic C3+ ions

Author

Winzen, D., primary, Hannen, V., additional, Bussmann, M., additional, Buß, A., additional, Egelkamp, C., additional, Eidam, L., additional, Huang, Z., additional, Kiefer, D., additional, Klammes, S., additional, Kühl, Th., additional, Loeser, M., additional, Ma, X., additional, Nörtershäuser, W., additional, Ortjohann, H.-W., additional, Sánchez, R., additional, Siebold, M., additional, Stöhlker, Th., additional, Ullmann, J., additional, Vollbrecht, J., additional, Walther, Th., additional, Wang, H., additional, Weinheimer, Ch., additional, and Winters, D. F. A., additional

Published
2021
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18. Laser spectroscopy of the $^2S_{1/2} - ^2P_{1/2}$, $^2P_{3/2}$ transitions in stored and cooled relativistic C$^{3+}$ ions

Author

Winzen, D., Hannen, V., Bussmann, M., Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., Kühl, Th., Löser, Markus, Ma, X., Nörtershäuser, Wilfried, Ortjohann, H.‑W., Sánchez, R., Siebold, M., Stöhlker, Thomas, Ullmann, J., Vollbrecht, J., Walther, Th., Wang, H., Weinheimer, Christian, Winters, D. F. A., and Universitäts- und Landesbibliothek Münster

Subjects
530 Physics, Atomic Physics (physics.atom-ph), Physics, FOS: Physical sciences, ddc:530, Atomic and molecular physics, Techniques and instrumentation, Physics - Atomic Physics
Abstract

The $^2S_{1/2} - ^2P_{1/2}$ and $^2S_{1/2} - ^2P_{3/2}$ transitions in Li-like carbon ions stored and cooled at a velocity of $\beta \approx 0.47$ in the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre in Darmstadt have been investigated in a laser spectroscopy experiment. Resonance wavelengths were obtained using a new continuous-wave UV laser system and a novel extreme UV (XUV) detection system to detect forward emitted fluorescence photons. The results obtained for the two transitions are compared to existing experimental and theoretical data. A discrepancy found in an earlier laser spectroscopy measurement at the ESR with results from plasma spectroscopy and interferometry has been resolved and agreement between experiment and theory is confirmed., Comment: 12 pages, 6 figures

Published
2020
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20. Laser spectroscopy of the 2S1/2-2P1/2, 2P3/2 transitions in stored and cooled relativistic C3+ ions.

Author

Winzen, D., Hannen, V., Bussmann, M., Buß, A., Egelkamp, C., Eidam, L., Huang, Z., Kiefer, D., Klammes, S., Kühl, Th., Loeser, M., Ma, X., Nörtershäuser, W., Ortjohann, H.-W., Sánchez, R., Siebold, M., Stöhlker, Th., Ullmann, J., Vollbrecht, J., and Walther, Th.

Subjects
LASER spectroscopy, VELOCITY, STORAGE rings, WAVELENGTHS, INTERFEROMETRY
Abstract

The 2 S 1 / 2 - 2 P 1 / 2 and 2 S 1 / 2 - 2 P 3 / 2 transitions in Li-like carbon ions stored and cooled at a velocity of β ≈ 0.47 in the experimental storage ring (ESR) at the GSI Helmholtz Centre in Darmstadt have been investigated in a laser spectroscopy experiment. Resonance wavelengths were obtained using a new continuous-wave UV laser system and a novel extreme UV (XUV) detection system to detect forward emitted fluorescence photons. The results obtained for the two transitions are compared to existing experimental and theoretical data. A discrepancy found in an earlier laser spectroscopy measurement at the ESR with results from plasma spectroscopy and interferometry has been resolved and agreement between experiment and theory is confirmed. [ABSTRACT FROM AUTHOR]

Published
2021
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21. Precision Measurement of the First Ionization Potential of Nobelium

Author

Chhetri, P., primary, Ackermann, D., additional, Backe, H., additional, Block, M., additional, Cheal, B., additional, Droese, C., additional, Düllmann, Ch. E., additional, Even, J., additional, Ferrer, R., additional, Giacoppo, F., additional, Götz, S., additional, Heßberger, F. P., additional, Huyse, M., additional, Kaleja, O., additional, Khuyagbaatar, J., additional, Kunz, P., additional, Laatiaoui, M., additional, Lautenschläger, F., additional, Lauth, W., additional, Lecesne, N., additional, Lens, L., additional, Minaya Ramirez, E., additional, Mistry, A. K., additional, Raeder, S., additional, Van Duppen, P., additional, Walther, Th., additional, Yakushev, A., additional, and Zhang, Z., additional

Published
2018
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24. Measurement of the lifetime and the proportion of 12 C 3+ ions in stored relativistic ion beams as a preparation for laser cooling experiments at the CSRe

Author

Wang, H.B., primary, Wen, W.Q., additional, Huang, Z.K., additional, Zhang, D.C., additional, Hai, B., additional, Zhu, X.L., additional, Zhao, D.M., additional, Yang, J., additional, Li, J., additional, Li, X.N., additional, Mao, L.J., additional, Mao, R.S., additional, Wu, J.X., additional, Yang, J.C., additional, Yuan, Y.J., additional, Eidam, L., additional, Winters, D., additional, Beck, T., additional, Kiefer, D., additional, Rein, B., additional, Walther, Th., additional, Loeser, M., additional, Schramm, U., additional, Siebold, M., additional, Bussmann, M., additional, and Ma, X., additional

Published
2017
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25. Flow Behavior of LCP Melts and Its Influence on Morphology and Mechanical Properties of Injection Molded Parts [*]

Author

NGUYEN, T. N., GEIGER, K., and WALTHER, TH.

Subjects
Polymer liquid crystals -- Testing -- Research, Fluid dynamics -- Research, Injection molding -- Research, Engineering and manufacturing industries, Science and technology, Testing, Research
Abstract

T. N. NGUYEN [1] K. GEIGER [1] TH. WALTHER [2] The flow behavior of two commercial liquid crystalline polymers (LCP), Vectra B 950 and Vectra L 950 (Ticona GmbH), was [...]

Published
2000

26. Laser cooling of relativistic heavy-ion beams for FAIR

Author

Winters, D, primary, Beck, T, additional, Birkl, G, additional, Dimopoulou, C, additional, Hannen, V, additional, Kühl, Th, additional, Lochmann, M, additional, Loeser, M, additional, Ma, X, additional, Nolden, F, additional, Nörtershäuser, W, additional, Rein, B, additional, Sánchez, R, additional, Schramm, U, additional, Siebold, M, additional, Spiller, P, additional, Steck, M, additional, Stöhlker, Th, additional, Ullmann, J, additional, Walther, Th, additional, Wen, W, additional, Yang, J, additional, Zhang, D, additional, and Bussmann, M, additional

Published
2015
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27. Progress of laser cooling of 12C3+ ions at the CSRe

Author

Wang, H B, primary, Ma, X, additional, Wen, W Q, additional, Huang, Z K, additional, Zhang, D C, additional, Hai, B, additional, Zhu, X L, additional, Zhao, D M, additional, Li, J, additional, Ma, X M, additional, Yan, T L, additional, Mao, R S, additional, Zhao, T C, additional, Wu, J X, additional, Yang, J C, additional, Yuan, Y J, additional, Xia, J W, additional, Loeser, M, additional, Siebold, M, additional, Schramm, U, additional, Boine-Frankenheim, O, additional, Eidam, L, additional, Winters, D, additional, Birkl, G, additional, Rein, B, additional, Walther, Th, additional, and Bussmann, M, additional

Published
2015
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36. Embossed ceramic reflectors with nano dispersive coatings for compact optoelectronic systems.

Author

Buss, W., Richter, H., Bartnitzek, Th., Brode, W., Heymel, A., and Walther, Th.

Abstract

Modern optoelectronic elements used in harsh environments like high ambient temperatures and UV-radiation are often equipped with ceramic housing and substrates which include integrated optical elements. This reflectors or beam shaping elements are realized by dead-mold casting or embossing technologies. The present paper describes a combined embossing, infiltration and coating process for realizing smooth reflector surfaces into Low Temperature Cofired Ceramics (LTCC) substrates. The measurement results of the reflection coefficients are comparable with full-metal aluminum-surfaces. The main fields of application so far have primarily been grooves for edge-emitter UV-LEDs with forward scattering reflector areas. [ABSTRACT FROM PUBLISHER]

Published
2011

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