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Shimooka, Takashi; Oguri, Hidetomo; Namekawa, Yuya*; Tomisawa, Tetsuo; Okumura, Yoshikazu; Hasegawa, Kazuo
JAERI-Tech 2002-038, 30 Pages, 2002/03
JAERI-Tech-2002-038.pdf:1.74MB
The high intensity proton accelerator facility project which is conducted jointly by JAERI and KEK is to use the secondary particles produced by nuclear spallation for various science studies. A negative hydrogen ion beam source for the accelerator is required to extract a peak beam current of more than 60 mA with a duty factor of 2.5 %. In addition, the ions should be negatively charged in order to improve the capture efficiency of the beam injected into a synchrotron. At JAERI, a negative ion source for the project has been developed with various technologies based on the large negative ion source for the nuclear fusion application. The negative ion beam current and the rms normalized emittance of 72 mA and 0.15 
mm.mrad were achieved in the cesium seeded operation, respectively. A waveform of the pulsed beam current was sensitive to the operation gas flow rate, and became to have a good flatness at about 16 SCCM. These results show that the basic performance of the ion source satisfies the requirement of the ion source for the project.
ion source for the high intensity proton LinacOguri, Hidetomo; Okumura, Yoshikazu; Hasegawa, Kazuo; Namekawa, Yuya*; Shimooka, Takashi*
Review of Scientific Instruments, 73(2), p.1021 - 1023, 2002/02
Times Cited Count：17 Percentile：64.47(Instruments & Instrumentation)At JAERI, a high intensity proton accelerator with a beam power of 1 MW has been proposed to pursue the nuclear-particle physics, materials and life sciences and R&D for nuclear transformation. A negative hydrogen ion source for the accelerator is required to extract a peak beam current of more than 60 mA with a normalized emittance of 0.15 pimm.mrad (rms). We have designed and tested a volume production type negative ion source to accumulate experimental data to fulfill the requirement for the accelerator. The source plasma is produced by an arc discharge using tungsten filaments. The cesium vapor is introduced into the arc chamber to enhance the beam current. The beam extractor consists of three electrodes with a single aperture of 8 mm in diameter. The negative ion beam current of 40 mA was achieved with a duty factor of 5 % at the beam energy and arc discharge power of 70 keV and 30 kW, respectively. The beam current increased linearly with the arc power in the cesium operation. The beam test by using a more powerful arc power supply is in progress.
