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Study of dark current phenomena in a superconducting accelerating cavity at the S-DALINAC

Gopych, M. and Gräf, H.-D. and Laier, U. and Müller, W. F. O. and Platz, M. and Richter, A. and Setzer, S. and Stascheck, A. and Watzlawik, S. and Weiland, T. (2005):
Study of dark current phenomena in a superconducting accelerating cavity at the S-DALINAC.
In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, p. 490, 539, (3), ISSN 01689002, [Online-Edition: http://dx.doi.org/10.1016/j.nima.2004.11.001],
[Article]

Item Type: Article
Erschienen: 2005
Creators: Gopych, M. and Gräf, H.-D. and Laier, U. and Müller, W. F. O. and Platz, M. and Richter, A. and Setzer, S. and Stascheck, A. and Watzlawik, S. and Weiland, T.
Title: Study of dark current phenomena in a superconducting accelerating cavity at the S-DALINAC
Language: English
Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume: 539
Number: 3
Divisions: DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > E: Beschleunigerentwicklung
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > E: Beschleunigerentwicklung > E2: Energie- und Intensitätssteigerung
Date Deposited: 20 Jun 2011 07:13
Official URL: http://dx.doi.org/10.1016/j.nima.2004.11.001
Identification Number: doi:10.1016/j.nima.2004.11.001
Alternative Abstract:
Alternative abstract Language
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 maximum energies of dark current electrons accelerated across the whole cavity were determined from bremsstrahlung spectra and compared with the results obtained by numerical simulations of electron trajectories utilizing a code based on the Leap-Frog method. Explanation of the experimentally observed energies was only possible by assuming a cavity with a strongly deteriorated field profile of the accelerating [pi]-mode caused by detuning of an end cell by 5.4�MHz. The consistency of this hypothesis was experimentally confirmed by comparing the present passband frequencies of this particular cavity with both the calculated ones from a simple lumped circuit model and the eigenfrequencies of other S-DALINAC cavities.English
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