Assertion: aleph | /r/CapableOf | hold a vertex detector
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text: Working outwards from the beam pipe, ALEPH held a vertex detector composed of two layers of double-sided silicon microstrips; an inner drift-chamber that provided 8 tracking coordinates and a trigger signal for charged particles from the interaction point; a time projection chamber – 4.4 metres long and 3.6 metres in diameter – to detect charged particles; an electromagnetic calorimeter to identify electrons and photons; a hadron calorimeter to detect hadrons; and a superconducting coil, 6.3 metres long and 5.3 metres in diameter, to provide the 1.5 tesla magnetic field necessary to work out a particle's charge and allow measurements of momentum.