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The proof test and debugging of the multi-pulsed electron accelerator,Dragon-2,requires a thorough comprehension of the quality of the beams. Thisputs forward a rigid requirement on the measurement system that it should havethe ability that not only differentiates the three pulses on the whole but alsotells the details of each pulse.In the measurements, beam energy is convertedby a target to the Optical Transition Radiation (OTR) light, the informationcarried by which provides a good approach to measure beam profile anddivergence simultaneously. Combining with this characteristic of OTR light, theconcept of dual-imaging method is adopted in the design of optical imagingsystem. To avoid interference of the system optical parameters with oneanother, the original system is separated into two parts by functions, one forbeam profile measurements and the other for divergence measurements.Correspondingly a splitter is interposed immediately after the OTR target whichsplits the light into two parts in perpendicular directions, one part forming abeam spot, and the remaining becoming polarized through a polarizer and imagedby an OTR lens and forming a beam divergence pattern. Again the use ofsplitters helps the light beam enter different framing camera for differentuse.With a time resolution of 2ns, the system can provide 8 frames of beamdetails within any one of the three pulses,at the same time as acquiring thequality of the three pulses on the whole.

Study on flexible and organizable time-resolved measurement system and technology for multi-pulsed electron beam parameter