Title :
A Hilbert transform spectrometer using a high-Tc Josephson junction for bunch length measurements at the TESLA Test Facility linac
Author :
Geitz, M. ; Hanke, K. ; Schmuser, P. ; Divin, Y.Y. ; Poppe, U. ; Pavlovskii, V.V. ; Shirotov, V.V. ; Volkov, O.Y. ; Menzel, J. ; Tonutti, M.
Author_Institution :
DESY, Hamburg, Germany
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 YBa2Cu3O7-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
Keywords :
Hilbert transforms; electron accelerators; electron beams; linear accelerators; particle beam bunching; particle beam diagnostics; superconducting junction devices; superconducting particle detectors; transition radiation; Hilbert transform spectrometer; TESLA Test Facility linac; YBa2Cu3O7-x; bicrystal substrate; bunch length measurement; bunch length measurements; coherent transition radiation; current-voltage characteristic; electron bunch; high-Tc Josephson junction; longitudinal charge distribution; longitudinal form factor; millimeter range; radiation-induced modification; submillimeter range; Electrons; Frequency; Josephson junctions; Length measurement; Linear particle accelerator; Region 8; Spectroscopy; Testing; Voltage; Wavelength measurement;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.794412
