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Journal Articles

J-PARC H$$^{-}$$ ion source and space-charge neutralized LEBT for 100-mA high energy and high duty factor LINACs

Ueno, Akira

Review of Scientific Instruments, 91(3), p.033312_1 - 033312_9, 2020/03

https://doi.org/10.1063/1.5126365
 Times Cited Count：4 Percentile：28.61(Instruments & Instrumentation)

In July 2019, a 3 GeV 920 kW beam was accelerated for 10.5 hours in the J-PARC. During the operation, the H$$^{-}$$ ion source and LINAC was operated with the beam duty factor (BDF) of 1.25% (0.5 ms$$times$$25 Hz) and the ejected beam intensities of 58 and 50 mA, respectively. Separately, they were stably operated with the BDF of 1.5% (0.6 ms$$times$$25 Hz) and the ejected beam intensities of 72 and 60 mA, respectively. Based upon the 100-mA and BDF 5% (1 ms$$times$$50 Hz) H$$^{-}$$ ion source operation on a test-stand, the possibility of the 100-mA high energy and high duty factor LINACs with a radio frequency quadrupole LINAC with an injection energy higher than 64 keV is presented. The unexpectedly effective space-charge neutralization effects in the low energy beam transport are also presented. Furthermore, the transverse emittance improvements by about 8% with the shortest beam extractor are presented.

Journal Articles

Measurement of a time dependent spatial beam profile of an RF-driven H$$^-$$ ion source

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

Review of Scientific Instruments, 91(1), p.013330_1 - 013330_5, 2020/01

https://doi.org/10.1063/1.5128015
 Times Cited Count：3 Percentile：21.33(Instruments & Instrumentation)

The ions are extracted from an ion source through a plasma sheath where a low frequency electromagnetic induction drives transport of charged particles including the target ions. High frequency alternating current commonly excites plasmas in sources for negative hydrogen (H$$^-$$) ions at a frequency in the MHz range. A high-speed beam current monitor system coupled to a narrow entrance slit enabled the investigation of the special distribution of the AC component intensity of the H$$^-$$ ion beam extracted from an ion source driven by a 2 MHz radio frequency (RF) power. The distribution showed a smaller oscillation of the beam at the center.

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