Measurement with beam of the deflecting higher order modes in the TTF superconducting cavities

Measurement with beam of the deflecting higher order modes in the TTF superconducting cavities

This paper reports on recent beam measurements of higher order modes in the TESLA Test Facility (TTF) accelerating modules. Using bunch trains of about 0.5 ms with 54 MHz bunch repetition and up to 90% modulated intensity, transverse higher order modes are resonantly excited when the beam is offset...

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Hauptverfasser: Magne, C., Jablonka, M., Lalot, M., Lethiers, V., Luong, M., Napoly, O., Baboi, N., Castro, P., Gossel, A., Huning, M., Kreps, G., Liepe, M., Minty, M., Schreiber, S., Sertore, D., Wendt, M.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Damping
Frequency modulation
Intensity modulation
Linear particle accelerator
Optical modulation
Optical pulses
Passband
Pulse modulation
Resonance
Superconducting magnets
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Beschreibung
Zusammenfassung:This paper reports on recent beam measurements of higher order modes in the TESLA Test Facility (TTF) accelerating modules. Using bunch trains of about 0.5 ms with 54 MHz bunch repetition and up to 90% modulated intensity, transverse higher order modes are resonantly excited when the beam is offset and their frequency on resonance with the modulation frequency. With this method, the trapped modes can be excited and their counteraction on the beam observed on a wide-band BPM downstream of the module. Scanning the modulation frequency from 0 to 27 MHz allows a systematic investigation of all possible dangerous modes in the modules.
DOI:10.1109/PAC.2001.988248