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For the CSNS-II upgrade, which targets a beam power of 500 kW by increasing the linac output energy from 80 MeV to 300 MeV and the peak current to 50 mA, the Medium Energy Beam Transport (MEBT) line will undergo a major redesign. The new MEBT features an optimized lattice with enhanced collimation to effectively manage the stronger space charge effects at higher beam intensity. Precise bunch length measurement is essential for optimizing the RF buncher cavities to achieve proper longitudinal compression and ensure good beam matching into the downstream Drift Tube Linac (DTL). To meet this requirement, a 20 GHz bandwidth fast Faraday cup (FFC) has been designed for the CSNS MEBT. The design incorporates impedance-matched structures and a minimized drift gap to mitigate the low-β effect while maintaining the bandwidth. To mitigate the high frequency signal transmission losses in long coaxial cables an electro-optical module has been adopted to transmit high frequency signal. Additionally, a cable correction scheme also has been studied for the signal transmission over long distance coaxial cable.
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