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论文类型：期刊论文

发表时间：2020-02-01

发表刊物：PHYSICS OF PLASMAS

收录刊物：EI、SCIE

卷号：27

期号：2

ISSN号：1070-664X

摘要：An accelerator electron bunch is focused and modulated in a plasma lens and then converted into a gamma-ray source using bremsstrahlung radiation in a dense material. In the linear regions with beam density much smaller than plasma density, a proper plasma density needs to be chosen to produce a high quality gamma-ray beam with a small spot size and low divergence, which can be applied in the radiograph of complex and dense objects with sub-millimeter resolution. As the bunch charge increases and bunch density approaches plasma density, micro-bunching of the bunch due to the nonuniform transverse wakefield and bunch energy chirp is observed, leading to a significant increase in gamma-ray beam divergence.