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- W1524554741 abstract "Characteristics and performance of the recently developed volume H− ion source and the helical electro‐static quadrupole (HESQ) at KEK are described. Observation of the H− beam intensity enhancement by introducing a small amount of cesium vapor is shown. The extracted H− beam current of 20 mA was obtained in the cesium‐mode operation. The measured 90% normalized beam emittance was about 1 πmm.mrad for 12 mA beam. We found that the workfunction of the plasma electrode surface which was decreased by cesium coverage had an important role to enhance the H− beam intensity. A helical electro‐static quadrupole (HESQ) for focusing low energy and high current negative ion beams has been developed at KEK. Various negative ions such as Cu− and Au− ion beams of more than several mA have been transported and focused with the HESQ. Comparison of the focused beam emittance between measurements and calculations are presented." @default.
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- W1524554741 date "1992-01-01" @default.
- W1524554741 modified "2023-09-27" @default.
- W1524554741 title "Development of the volume H− ion source and the helical electrostatic quadrupole at KEK" @default.
- W1524554741 doi "https://doi.org/10.1063/1.44824" @default.
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