Slow neutrons are extracted from the reactor through neutron beam tubes. These are often called thimbles.
Thermal beam tube H11
H11 is a thermal neutron beam tube feeding the single crystal diffractometer D19, the powder difractometers D2B and D20.
The capture flux φc = ∫(∂φ(λ)/∂λ)(λ/1.8 Å)dλ is measured with the activation of a gold foil at the outlet of the reactor shielding (September 2003).