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Unexpected results on microwave waveguide mode transmission measurements in the SPS beam pipe
In order to measure the electron cloud density, a microwave transmission measurement was set up over 30 m in the SPS beam pipe. The use of TE waveguide modes eliminates direct interaction with the highly relativistic beam. An electron cloud present in the beam pipe should lead to a small phase shift of the CW microwave signal. Since this phase shift is modulated by the bunch revolution frequency, it translates to a phase modulation which can be measured. However, defying all expectations, adoi:10.5170/cern-2005-001.89 fatcat:vhjmxltvdndkxcfrziwms6yhhi