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Description
Raspberry Pi cameras (single board CMOS cameras) have already been successfully implemented for ion beam characterization at IAP Frankfurt and are now also being used to investigate multipacting during cavity conditioning. Multipacting appears caused by resonant secondary electron emission.
For the standalone rf conditioning of the FRANZ (Frankfurt Neutron Source) RFQ (Radio-Frequency Quadrupole) and the IH-DTL (Interdigital H-mode Drift-Tube-Linac), these cameras were installed both inside and outside the vacuum to detect multipacting and other cavity glowing effects. The occurrence of multipacting at specific power levels within the cavities can be confirmed by simulations.
In addition, the observed multipacting is characterized through spectrometer measurements.