M. Geitz

Publications (9)3.3 Total impact

• Article: Measurements of coherent diffraction radiation and its application for bunch length diagnostics in particle accelerators.

  M Castellano, V A Verzilov, L Catani, A Cianchi, G Orlandi, M Geitz
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  ABSTRACT: Measurements of coherent diffraction radiation from a slit of variable width generated by short electron bunches were performed in millimeter and submillimeter ranges. Experimental data are compared with the transition radiation case and theoretical predictions. A more realistic description than the conventional theory is necessary to account for the data correctly. No noticeable difference in the estimated bunch length was observed using diffraction radiation in a wide range of slit widths and transition radiation.
  Physical Review E 06/2001; 63(5 Pt 2):056501. · 2.26 Impact Factor
• Conference Proceeding: Transverse Emittance Measurements in the TTF Injector

  H. HEDWARDS, M. CASTELLANO, L. CATANI, A. CIANCHI, M. FERRARIO, M. GEITZ, S. SCHREIBER, D. SERTORE, F. STEPHAN
  FEL99 Conference, DESY, Hamburg; 08/1999
• Source

  Available from: Y. Y. Divin

  Article: Hilbert-transform spectroscopy with high-Tc Josephson junctions: first spectrometers and first applications

  Y.Y. Divin, U. Poppe, K. Urban, O.Y. Volkov, V.V. Shirotov, V.V. Pavlovskii, P. Schmueser, K. Hanke, M. Geitz, M. Tonutti
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  ABSTRACT: First laboratory prototypes of Hilbert-transform spectrometers have been developed. To meet the requirements of Hilbert-transform spectroscopy, high-T_c Josephson junctions with RSJ-like behavior have been fabricated on twin-free NdGaO₅ bicrystal substrates. The operation of the spectrometers has been demonstrated from 60 GHz up to 2.25 THz. The first out-of-lab application of Hilbert-transform spectrometers has been successfully demonstrated at the TESLA Test Facility linear accelerator at DESY (Hamburg). The spectra of coherent transition electromagnetic radiation from electron bunches have been measured and a bunch length of σ_t=1.2 ps has been derived from these spectra. The market perspectives for Hilbert spectrometers have been estimated
  IEEE Transactions on Appiled Superconductivity 07/1999; · 1.04 Impact Factor
• Source

  Available from: desy.de

  Conference Proceeding: Bunch compressor II at the TESLA Test Facility

  M. Geitz, A. Kabel, G. Schmidt, H. Weise
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  ABSTRACT: In the TESLA Test Facility (TTF), short bunches with low emittance are needed for the operation of a free electron laser. Several stages of bunch compression by means of magnetic chicanes will be used to reach the required peak current. The second stage of the bunch compression system, bunch compressor II, has been taken into operation recently. We describe design and instrumentation of the bunch compressor II and communicate experiences made during commissioning
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Source

  Available from: cern.ch

  Conference Proceeding: Phase space tomography at the TESLA Test Facility linac

  M. Geitz, G. Schmidt, P. Schmuser
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  ABSTRACT: The transverse phase space distribution of an electron beam can be determined with a quadrupole scan by measuring the resulting beam profiles via optical transition radiation and applying a tomographic reconstruction method. Phase space tomography has been successfully used at the TESLA Test Facility (TTF) linac equipped with a radio frequency photo-injector. Measurements of phase space distributions and emittances will be presented
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Source

  Available from: cern.ch

  Conference Proceeding: Bunch length measurements using a Martin Puplett interferometer at the TESLA Test Facility linac

  B. Leissner, C. Berger, R. Siedling, M. Tonutti, M. Geitz, G. Schmidt, P. Schmuser
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  ABSTRACT: The longitudinal charge distribution of the electron bunches in the TESLA Test Facility linac has been determined using coherent transition radiation produced at a thin metal foil. The autocorrelation of the radiation pulse is measured with a Martin Puplett interferometer and then Fourier transformed to yield the coherent radiation spectrum and the bunch form factor. Several techniques, including a Kramers-Kronig analysis, have been applied to determine the longitudinal bunch charge distribution. Measurements with a thermionic electron gun and a RF photoinjector are presented. The influence of frequency-dependent acceptance corrections is discussed
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Source

  Available from: Y. Y. Divin

  Conference Proceeding: A Hilbert transform spectrometer using a high-Tc Josephson junction for bunch length measurements at the TESLA Test Facility linac

  M. Geitz, K. Hanke, P. Schmuser, Y.Y. Divin, U. Poppe, V.V. Pavlovskii, V.V. Shirotov, O.Y. Volkov, J. Menzel, M. Tonutti
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  ABSTRACT: The longitudinal charge distribution of an electron bunch can be determined from the coherent transition radiation emitted when the bunch crosses a thin metal foil. A Josephson junction made from a thin film of YBa₂Cu₃O_7-x on a bicrystal substrate is used as a detector for transition radiation in the millimeter and submillimeter range. The spectral intensity of the radiation and the longitudinal form factor of the bunch are derived by applying a Hilbert transformation to the radiation-induced modification of the current-voltage characteristic of the Josephson junction. The physical principles of a Josephson junction as a detector for submillimeter radiation are outlined and a first bunch length measurement is presented
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Source

  Available from: Mohammed Fouaidy

  Article: First observation of self-amplified spontaneous emission in a free-electron laser at 109 nm wavelength

  J. Andruszkow, B. Aune, V. Ayvazian, N. Baboi, R. Bakker, V. Balakin, D. Barni, A. Bazhan, M. Bernard, A. Bosotti, [......], M. Wendt, M Werner, M M. White, I. Will, K. Wittenburg, S Wolff, M.V. Yurkov, K. Zapfe, P. Zhogolev, F Zhou
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  ABSTRACT: We present the first observation of self-amplified spontaneous emission (SASE) in a free-electron laser (FEL) in the vacuum ultraviolet regime at 109 nm wavelength (11 eV). The observed free-electron laser gain (approximately 3000) and the radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width, and intensity fluctuations, are all consistent with the present models for SASE FELs.
• Article: Sub-picosecond bunch length measurement at the TESLA test facility

  M Geitz, G Schmidt, P Schmüser, G.v Walter
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  ABSTRACT: Sub-picosecond electron bunches are required for the operation of future VUV and X-ray Free Electron Lasers. A streak camera, a Martin–Puplett interferometer and a longitudinal phase space rotation method have been applied at the TESLA Test Facility linac to measure electron bunch lengths.
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.