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Effect of a 2-MHz RF source on the H$$^-$$ beam extracted from an RF-driven high-intensity H$$^-$$ ion source

Shinto, Katsuhiro   ; Shibata, Takanori*; Wada, Motoi*

In most proton accelerator facilities such as J-PARC, SNS, CERN, a H$$^-$$ ion source equipped with a 2-MHz rf driver for plasma generation produces H$$^-$$ beams. We have reported H$$^-$$ beam characteristics extracted from the J-PARC rf-driven high-intensity H$$^-$$ ion source. We have been developing an emittance measurement apparatus equipped with a highly time-resolved data acquisition system in order to observe fluctuation of the beam emittance in association with the frequency of the rf driver. By using this apparatus, we found that the beam emittance is fluctuated with the frequency with the rf driver and higher harmonics. We will show some obtained results of the emittance fluctuation.

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