Abstract
A bucket plasma source for the 10 MW neutral beam test stand has been constructed by using aluminium-alloy which is a material of low density and low neutron induced radioactivity. In order to improve heat removal which is mainly generated along the cusp line in the bucket plasma source, a magnet arrangement 1 of the dislocated cusp line (DCL) type similar to that of the CORDIS 2 ion source was applied. Simultaneously a chamber structure was fabricated featuring good heat transfer through the use of corrugated fins. The characteristics of this source in pulsed operation for the DCL have been investigated and compared with those in the normal cusp line (NCL). Cooling was efficient and metal arcing has not occurred in the DCL arrangement. However, the arc power efficiency in the case of the DCL was decreased by a factor of 1.2 ∼ 1.6 compared with that in the NCL. The plasma potential in the DCL is positive and higher than that in the NCL. The ion current density of about 0.2 A cm −2 in the hydrogen plasma was achieved across an area of 16×66 cm 2 with density uniformity of better than 10% at about 120 kW of arc power for a pulsed period of 1 s.
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