ECRIS99

ABSTRACTS

Upgrade of the ATLAS 10 GHz ECRIS

Moehs D. P, Vondrasek R. C, Pardo R. C, Xie D1.
Argonne National Laboratory, Physics Division, 9700 S. Cass Ave., Argonne IL 60439, USA
1Berkeley Ion Equipment Inc., 3400 De La Cruz Blvd. V, Santa Clara CA 95054, USA


A major renovation of the ATLAS 10 GHz ECRIS, which began operations in 1987, is in the planning and acquisition phase. The old two-stage source will be converted to a single stage design including a high gradient magnetic field, electron donor disk, large radial ports, and flexible modular design. Eight solenoid coils taken from the existing ECR will produce the axial mirror. The individual coils will be encased in an iron yoke that optimizes the magnetic field. Computer modeling of the field profile yields a minimum field along the axis of 3.0 kG with mirror ratios of 4.4 and 2.9. An open hexapole configuration consisting of Nd-Fe-B bars enclosed in an austenitic stainless steel housing will be placed in an aluminium plasma chamber that will be water cooled along the poles of the hexapole. The hexapole field at the chamber wall, 4 cm in radius, is expected to be 9.3 kG along the magnet poles and 5.7 kG along the center of the pole gaps, which are 2.4 cm wide. A 3D model produced from individual 2D field profiles was used to check the end effects of the hexapole. Based on the models this new field configuration is capable of supporting a second ECR resonance zone at 14 GHz, which may be implemented at a later date.

This work was supported by the US Department of Energy Nuclear Physics Division, under contract W-31-109-ENG-38.

Presenting Author : Pardo R. C
Presentation : Poster
Wednesday Poster Session at 14:45