Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Hans-Dieter Gräf"'
Autor:
Achim Richter, M. Gopych, Andreas Zilges, J. Hasper, W. Bayer, Ralf Eichhorn, Hans-Dieter Gräf
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 575:321-327
We report on a study of field emission accompanied by emission of visible light and by emission of characteristic X-rays in a 5 and a 20 cell superconducting niobium 3 GHz accelerating cavity of the S-DALINAC injector. The nearly absorption free meas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fd37d340c165a13737427201e51e27b
https://doi.org/10.1016/j.nima.2007.02.103
https://doi.org/10.1016/j.nima.2007.02.103
Autor:
Achim Richter, Thomas Weiland, Ulrich Laier, Hans-Dieter Gräf, Wolfgang Franz Otto Müller, S. Watzlawik, M. Platz, M. Gopych, M. Brunken
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 564:94-99
The quality factors of the 20 cell, 3 GHz niobium cavities of the S-DALINAC are smaller by almost a factor of three compared to their design value. Combined with the limited cryogenic power of the helium refrigerator in use, this restricts the maximu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e58e634f25ec6eb47da2e666c02e46d9
https://doi.org/10.1016/j.nima.2006.04.053
https://doi.org/10.1016/j.nima.2006.04.053
Autor:
Wolfgang Franz Otto Müller, Thomas Weiland, Hans-Dieter Gräf, Ulrich Laier, A. Stascheck, S. Watzlawik, M. Platz, Stefan Setzer, M. Gopych, Achim Richter
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 539:490-498
We report on a study of field emission accompanied by emission of light in a 20 cell superconducting niobium 3 GHz cavity of the S-DALINAC. The spectral power of the observed light could be interpreted as black body radiation at about 1500 K. The max
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0d559e93afa576623f2bc6e8ec356ba
https://doi.org/10.1016/j.nima.2004.11.001
https://doi.org/10.1016/j.nima.2004.11.001
Autor:
Hans-Dieter Gräf, Sergiy Khodyachykh, Mikhail Yurkov, Vivek Asgekar, Harald Genz, Achim Richter, C. Hessler, E.L. Saldin, Evgeny Schneidmiller, M. Brunken, Thorsten Wesp
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 530:205-216
The aim of the present work is to investigate the influence of a tapered undulator on the main parameters of an free electron laser (FEL). The experiments were carried out at the Darmstadt FEL at an electron beam energy of 31 MeV and a wavelength of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b46477ebb80f49f2c1bf53ab972a4723
https://doi.org/10.1016/j.nima.2004.04.225
https://doi.org/10.1016/j.nima.2004.04.225
Autor:
Hans-Dieter Gräf, Achim Richter, Peter Mohr, M. Platz, H. Weise, B. Schweizer, S. Watzlawik, J. Herrmann, Ulrich Laier, M. Hüning
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 512:453-458
We report on the development and application of robust, inexpensive bremsstrahlung detectors, so called Compton diodes, for a photon energy from 5 MeV to more than 130 MeV . The detector signal is estimated from a simple analytical model and compared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4adb4e4b388062a1d8af1cd56e60031d
https://doi.org/10.1016/s0168-9002(03)01925-9
https://doi.org/10.1016/s0168-9002(03)01925-9
Autor:
Achim Richter, Harald Genz, Theodor Tschudi, K. Gerstner, Hans-Dieter Gräf, Rainer Hahn, Bernd Schweizer, H. Jennewein
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 498:22-28
A simple method for an absolute measurement of the cavity length of a Free Electron Laser (FEL) with a non-contact optical technique is presented. The injection current of a semiconductor laser diode is modulated with a proper frequency and amplitude
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4b730e3e4337812dc603b0ee1a16dba
https://doi.org/10.1016/s0168-9002(02)01982-4
https://doi.org/10.1016/s0168-9002(02)01982-4
Publikováno v:
Physical Review Letters. 86:3284-3287
In general, trace formulas relate the density of states for a given quantum mechanical system to the properties of the periodic orbits of its classical counterpart. Here we report for the first time on a semiclassical description of microwave spectra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93f0aec0a20efeb2ad646fb758c83c16
https://doi.org/10.1103/physrevlett.86.3284
https://doi.org/10.1103/physrevlett.86.3284
Autor:
C. Dembowski, Andreas Heine, Hanns Ludwig Harney, Hans-Dieter Gräf, H. Rehfeld, W. D. Heiss, Achim Richter
Publikováno v:
Physical Review Letters. 86:787-790
We report on a microwave cavity experiment where exceptional points (EPs), which are square root singularities of the eigenvalues as function of a complex interaction parameter, are encircled in the laboratory. The real and imaginary parts of an eige
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c19dc791614450a1a5d95051c77d9014
https://doi.org/10.1103/physrevlett.86.787
https://doi.org/10.1103/physrevlett.86.787
Publikováno v:
Scopus-Elsevier
The spectrum of a chaotic two-dimensional quantum billiard with threefold symmetry has been studied in an experiment with a superconducting microwave cavity. In total 622 eigenvalues were identified experimentally and compared with numerical calculat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72a802695aabdd87f83e7b9c5023956d
https://doi.org/10.1103/physreve.62.r4516
https://doi.org/10.1103/physreve.62.r4516
Publikováno v:
Nuclear Physics A. 669:3-13
The excitation of the J π ;T=1 + ;0 and 1 + ;1 states at E x =12.71 and 15.11 MeV in 12 C has been studied at momentum transfers q fm −1 in inelastic electron scattering. The corresponding ground state radiation widths and transition radii for the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e79a4f54315dd4173cdc94c373be901
https://doi.org/10.1016/s0375-9474(99)00564-3
https://doi.org/10.1016/s0375-9474(99)00564-3