Iron at GSI

The ⁵⁸Fe  beams were produced in 1997, 1999, 2002 using highly enriched isotopic material. For the metal ion beam production a resistively heated oven with a W-Re heating wire was used. The CAPRICE ECRIS was optimized for the production of Fe⁸⁺ and the ion source settings are listed below. For these beamtimes the maximum intensity was never requested. As long as the experimentalists were satisfied with the achieved intensity and stability, the ion source parameters were no longer adjusted.  A stable intensity was measured in 1997 with 55 eµA of ⁵⁸Fe⁸⁺ and a charge state distribution was measured (GSI iron beam spectrum 1997.pdf). During that beamtime the intensity was optimized up to 95 eµA of ⁵⁸Fe⁸⁺.

• Auxiliary gas: He
• Pressure: 5 to 8 x 10^-6 mbar
• Microwave Power: 100 W to 150 W @ 14.5 GHz
• Total extracted current around 1,5 to 2,0 mA
• Oven material load up to 950 mg
• Oven heating power around 50 W  (40 W to 60 W)
• Material consumption around 3 mg/h

References:

[1] R.Lang, J. Bossler, H. Schulte, K. Tinschert, "Investigation of different oven types for sample evaporation in the CAPRICE electron cyclotron resonance ion source ", Rev. Sci. Instrum. 71, number 2, Feb 2000, pages 651-653