Noninvasive cavity-based charge diagnostic for plasma accelerators
arxiv(2024)
摘要
The charge contained in an electron bunch is one of the most important
parameters in accelerator physics. Several techniques to measure the electron
bunch charge exist. However, many conventional charge diagnostics face serious
drawbacks when applied to plasma accelerators. For example, integrating current
transformers (ICTs or toroids) have been shown to be sensitive to the
electromagnetic pulses (EMP) originating from the plasma, whereas scintillating
screens are sensitive to background radiation such as betatron radiation or
bremsstrahlung and only allow for a destructive measurement of the bunch
charge. We show measurements with a noninvasive, cavity-based charge diagnostic
(the DaMon), which demonstrate its high sensitivity, high dynamic range and
resistance towards EMP. The measurements are compared to both an ICT and an
absolutely calibrated scintillating screen.
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