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Shielding Calculations for the New Experimental Storage Ring for the Facility for Antiproton and Ion Research

K. Vogt, G. Fehrenbacher, A. Knapp, T. Radon

Nuclear Technology / Volume 168 / Number 2 / November 2009 / Pages 528-532

Shielding / Special Issue on the 11th International Conference on Radiation Shielding and the 15th Topical Meeting of the Radiation Protection and Shielding Division (Part 2) / Radiation Protection

The new experimental storage ring (NESR) is one of the new facilities planned for the Facility for Antiproton and Ion Research (FAIR) project. It is conceived as a versatile storage ring used for experiments with stored ion beams (up to 740 MeV/u for uranium beams) and for the deceleration of antiprotons from the injection energy of 3 GeV, which are subsequently extracted and used for experiments elsewhere.

The planning of the shielding requires particular accuracy because rooms adjacent to the NESR are desired to be accessible at all times. Extensive shielding calculations have been done using the Monte Carlo code FLUKA. Calculations were performed separately for the different operation modes of the storage ring, as well as for the different parts of the facility. Because of the large shielding thicknesses required (up to [approximately]4 m), biasing techniques had to be employed. While the results of the calculations confirmed that the planned shielding is sufficient in most places, two areas have been identified where a reinforcement of the shielding is recommended.

 
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