Hamburg 2001 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Postersitzung III: Pinning und Vortexdynamik, Massive HTSL, Bandleiter, Transporteigenschaften in HTSL, SL dünner Filme, Elektronen und Phononen in HTSL, Tunneln, Borkarbide, Quantenphasen und Metall-Isolator-Überg
änge, Anwendungen, Sonstiges
TT 25.65: Poster
Donnerstag, 29. März 2001, 14:30–17:00, Rang S\ 3
THz-Spectroscopy with YBa2Cu3O7-Josephson junctions for bunch length measurements at TTF — •Frank Ludwig1, Andre Kaestner1, Jan Menzel2, and Meinhard Schilling1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Jungiusstrasse 11, 20355 Hamburg — 2Deutsches-Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg
For the detection and spectral characterization of transition radiation in the operation of the linear accelerator at the TESLA test facility (TTF) we employ Hilbert-spectroscopy with Josephson junctions from high-temperature superconductors (HTS). The Josephson junctions with integrated wideband antennas from HTS are prepared on symmetric 24o LaAlO3 bicrystal substrates. We obtain for a 6 micrometer wide junction an ICRN-product of 170 microvolt at 77 K and 2.0 millivolt at 10 K. The set-up is optimized for low insertion loss over a wide frequency range from 76 GHz to 2 THz. For operation at TTF the Josephson junction is well shielded against the large magnetic background fields of the focussing magnets, 50 Hz-disturbances and the static magnetic fields of the wiggler-magnets. The HF-characterization is made by microwave Hilbert-spectroscopy at 20 GHz, 76 GHz and a far-infrared laser at 762 GHz and further lines in the THz-regime. We discuss the possibility as well as the limitations of the method to detect electromagnetic picosecond-pulses by Hilbert-transform spectroscopy. We acknowledge financial support by DESY, Hamburg.