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Schematics of the NSRRC low energy thermionic rf gun linac system for ultrashort beam generation with velocity bunching.

Schematics of the NSRRC low energy thermionic rf gun linac system for ultrashort beam generation with velocity bunching.

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A low energy linac system equipped with a thermionic cathode rf gun is being built at NSRRC to demonstrate the concept of aggressive bunch compression by velocity bunching in the rf linac to produce high brightness GHz-repetition-rate femtosecond electron pulses. A beam with 30 pC bunch charge and pulse duration shorter than 100 fsec can be produce...

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... electron pulses with few tens MeV beam energy found interesting applications on generation of intense coherent THz radiations and ultrafast X-rays [1,2]. An S-band linac system that employs the mechanism of velocity bunching in the early stage of acceleration in the rf linac for production of 20-30 MeV ultrashort electron beam is now under construction at NSRRC (Figure 1). In order to optimize velocity bunching, a high power phase shifter is installed for changing the linac injection phase. ...

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