The Pions and Kaons travel through the first Helium-pipe(#1) towards another poraboloid magnet, the Reflector, that refocusses lower-energy particles that were too much deflected in the Horn. This one operates at 120 kA and 5.2 kV, adding another 12 centimes to the cost per pulse.
A second Helium-pipe(#2) follows, transporting the beam to the entrance of the Vacuum decay tunnel with a length of 290 meters and a volume of 412 cubic meters. The decay tunnel is closed by a 2 mm thick Titanium foil. For safety reasons (implosion risk) the tunnel is also closed with a thick circular steel plate, that is interlocked with the access system. It is automatically removed when run-conditions have been established.
Be aware: this excursion has added about 120 microSieverts to your accumulated virtual radiation dose! (yearly dose from natural sources is about 5 milliSieverts, so it is about one extra weekly dose, or half a transatlantic fligth)