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Description
The applications of proton beams require precise diagnosis of their properties including spectrum and spatial distribution. Distinct from the case of traditional accelerators, limited online detectors are available for laser-driven proton beams with high transient fluence, somewhat impeding the progress in this field.
This paper presents an online proton spectrometer, named Scintillation Fiber Cube Proton Spectrometer (SFCPS), which can diagnose proton beams with sub-millimeter (~500 um) spatial resolution and wide fluence range. The SFCPS offers an energy range of approximately 6~93 MeV with an energy resolution of 0.5% at 80 MeV, as calibrated. We demonstrated the SFCPS's ability to reconstruct the 2D energy spectrum of parallel proton beams with uneven spatial distributions. Further discussion and analysis reveal that the SFCPS's lower detection threshold for proton beams is approximately 1×10^5 p/cm2.
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