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MOPP01 |
Overview of Beam Instruments at the Prototype Front-End Linac for Chinese Accelerator-Driven Subcritical System (CiADS) | |
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Funding: Supported by Large Research Infrastructres "China Initiative Accelerator Driven System" (Grant No.2017-000052-75-01-000590) The prototype front-end superconducting proton LINAC (CAFe) for the China Accelerator Driven Subcritical System (CiADS) has been constructed since 2011. After ten years hard work, in February of 2021, this LINAC reached its design goal with the successful commissioning of a 10 mA, 205 kW continuous-wave (CW) proton beam with the energy of 20 MeV. CAFe’s beam availability during long-term, high-power operation was measured to be 93- 96%, indicating high reliability: 12 hours of operation at 174 kW / 10 mA and 108 hours at 126 kW / 7.3 mA. To reach this final goal, challenges must be overcome including beam-loss control and detection, heavy beam loading and rapid fault recovery. During the whole process, beam instruments played a key point to overcome all those challenges. The beam diagnostics team delivered a comprehensive suite of instrumentation that supported the machine commissioning and operations, provided relevant feedback and beam interlock signal of the accelerator operation as well. A suite of instrumentation was commissioned and performed that includes a variety of current monitors, normal and cold capacitive BPMs, transverse and longitudinal profile monitors, multi-slit and single-slit scanning emittance stations, time-of-flight and magnetic field related energy and energy spread measurements, beam loss monitors and a target imaging system as well. The commissioning results and performance of these systems will be described, as well as the current and beam loss measurement for fast machine protection with the responding time of less than 10 us. Also the ten year’s lessons learnt will be described. |
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