d="par0005">The magnetic filter field and the electron deflection magnetic field were designed by using OPERA-3D code.
dd><dt class="label">•dt><dd>d="par0010">The magnetic filter field is produced by a pair of permanent magnets. The electron deflection field is produce by 6 bar-magnets embedded in the extraction grid.
dd><dt class="label">•dt><dd>d="par0015">The negative ion beam current density is about 0.6 mA/cm2 at 5 kW RF power, which is proportional to RF power in lower RF power region.
dd><dt class="label">•dt><dd>d="par0020">The required operation pressure of ITER NBI ion source is less than 0.3 Pa, the result showed the maximum current at 0.3 Pa.
dd><dt class="label">•dt><dd>d="par0025">The effect of floating of the plasma bucket was observed. When the plasma bucket is floating, the negative beam and electron current are enhanced, but e/H-ratio also increased.
dd>dl>