Pressure Dependence of Negative Hydrogen Ion Production in a Cesium Seeded Tandem Volume Source

Uniform Negative Ion Beam Extraction in a Cesium-Seeded Large Negative Ion Source with a Tent Magnetic Filter

For improvement of spatial uniformity of negative ion beams, the external magnetic filter was replaced to a novel tent-shaped magnetic filter in the JAEA 10 ampere negative ion source. The tent filter geometry is based on new findings in surface production of negative ions in high electron temperature plasmas. In order to link the tent filter, the original line-cusp field configuration on the s...

Relationship between production and extraction of D/H negative ions in a volume negative ion source

Pure volume production of D negative ions is studied in rectangular negative ion source equipped with an external magnetic filter (MF). Production and control of D2 plasma with the MF is nearly the same as that of H2 plasmas. Plasma parameters (ne and Te) in D2 plasmas are varied mainly in the downstream region by changing the magnetic field intensity of the MF (i.e., BMF), although the values ...

Status of the J-parc Negative Hydrogen Ion Source

A cesium-free negative hydrogen ion source driven with a LaB6 filament is being operated for J-PARC. The beam commissioning of J-PARC accelerators started in November 2006. As of June 2010, there have been 34 beam commissioning or supply runs. In these runs, the ion source has been successfully operated in two different modes such as low current mode of 5 mA and high current mode of 30 mA. Acco...

Production of large-volume negative-ion source using multistring-type CF4 magnetized plasma

Spatial variation of negative ion density in a volume H- ion source

2014 The density distribution of negative hydrogen ions along the axis of a hybrid multicusp Hion source was measured, at different pressures, by using the photodetachement technique. It was found that in the region close to the plasma electrode (first electrode of the extractor) the negative ion density is strongly influenced by the stray magnetic field of the extractor magnets. This stray mag...