Speaker
Description
Multipacting, driven by resonant secondary electron emission, is a critical phenomenon during the conditioning of RF cavities. To investigate and characterize this effect, novel and low-cost optical diagnostic methods utilizing single-board CMOS cameras (Raspberry Pi cameras) have been developed at IAP Frankfurt. Building on their successful application in ion beam characterization, these compact cameras were installed both inside and outside the vacuum system of the FRANZ (Frankfurt Neutron Source) RF cavities.
The conditioning campaign was conducted in two distinct phases: initially, the RFQ (Radio-Frequency Quadrupole) and the IH-DTL (Interdigital H-mode Drift-Tube-Linac) were conditioned as standalone structures. Subsequently, both cavities were coupled and conditioned together. Throughout both phases, the camera setup enabled the in-situ optical detection of multipacting and other luminescence effects.
The experimental observations are corroborated by simulations, which confirm the onset of multipacting at specific RF power levels. Furthermore, complementary spectrometer measurements provide a detailed characterization of the observed processes.
Funding Agency
Helmholtz Forschungsakademie Hessen für FAIR (HFHF)
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| Supervisor's name | Dr. Hendrik Hähnel |
| Supervisor's email | haehnel@iap.uni-frankfurt.de |
| Paper submission software | LATeX |