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Report No.

Space charge neutralization studies with H$$^{-}$$ beam in low energy beam transport test stand

Artikova, S.; Takagi, Akira*; Shibata, Takanori*; Ikegami, Kiyoshi*

J-PARC is intensity-upgraded up to pulse current of 50 mA of H$$^{-}$$ beam. Two-solenoid based LEBT test stand is being built to support the operation of J-PARC linac. It imitates the actual LEBT of linac, yet contains the diagnostics chamber composed of horizontal and vertical beam emittance meters and Faraday-cup for the current measurement. Vacuum composition of LEBT is predominantly H$$_2$$ gas. The pressure inside the LEBT can be varied by the differential pumps allowing us to study the beam phase space evolution under space charge effects. The measurements of the beam phase space emittance were made as a function of the residual gas pressure. This paper presents the results and discussion on beam space charge neutralization and its effect on the beam phase space emittance.



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