Open AccessMeasuring the Resonance Structure of Accelerator Impedance with Single Bunches
Author(s) -
Thomas Bohl,
T. Linnecar,
E. Shaposhnikova
Publication year - 1997
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.78.3109
Subject(s) - bunches , electrical impedance , physics , amplitude , particle accelerator , resonance (particle physics) , modulation (music) , range (aeronautics) , nuclear magnetic resonance , linear particle accelerator , large hadron collider , instability , atomic physics , optics , nuclear physics , beam (structure) , materials science , acoustics , quantum mechanics , composite material , mechanics
We describe a new method used in the CERN SPS accelerator to measure the longitudinal impedance in the frequency range 100MHz to 4GHz. Single high intensity proton bunches were injected and their spectrum observed during slow debunching. The presence of different resonant impedances leads to line density modulation at the resonant frequencies. This instability reaches some maximum modulation amplitude which was recorded as a function of frequency for many bunches. Using sufficiently long bunches the SPS impedance structure was observed and previously unknown sources were identified. {copyright} {ital 1997} {ital The American Physical Society}
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