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The experiment will be almost fully embedded in heavy concrete shielding. In the region between the cyclotron trap and the CCD detector more than \( 1m \) of concrete is needed to suppress the neutron background to a tolerable level. Between cyclotron trap and crystal box an especially tailored concrete arrangement will be designed in order to only allow a path for the X-rays.

The large mass of the shielding of about \( 100 \) tons has an additional benefit as it serves as a very efficient buffer for temperature changes as was noted in recent experiments [9].

Pionic Hydrogen Collaboration