Title :
The CERN SPS Experiment on Microwave Transmission through the Beam Pipe
Author :
Kroyer, T. ; Caspers, F. ; Mahner, E. ; Wien, T.U.
Author_Institution :
CERN, Geneva, Switzerland, tom.kroyer@cern.ch
Abstract :
In the CERN SPS microwave transmission measurements through beampipe sections with a length of 30 m and 7 m respectively have been carried out in the frequency range 2-4 GHz since spring 2003. Here we report on new results obtained with improved measurement techniques during the 2004 run. Observation techniques include a fast real time scope, spectrum analyser IF and video output signal registration and baseband signal observation using a PC soundcard. The unexpected beam–induced amplitude modulation has been confirmed on all kinds of available beams including single bunches. It was found that there is a correlation between the amount of beam induced signal attenuation and the beam losses registered by external scintillators. Potential theoretical models are discussed.
Keywords :
Amplitude modulation; Attenuation; Clouds; Density measurement; Electromagnetic measurements; Electromagnetic waveguides; Frequency measurement; Large Hadron Collider; Microwave measurements; Power amplifiers;
Conference_Titel :
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Print_ISBN :
0-7803-8859-3
DOI :
10.1109/PAC.2005.1591060
