chamber (TPC). For measuring the velocity of the electrons in a gas (drift velocity) there are special drift chambers, velocity drift chambers, which measure the drift time for a known location of ionisation. See also Wilson chamber Bubble chamber Gaseous ionization detector Micropattern gaseous detector Particle detector References External links hypermail_ archive of links to CLAS drift chambers Heidelberg lecture on research ionisation chambers Astroparticle physics Experimental particle physics Ionising radiation detectors Laboratory equipment Nuclear physics Particle detectors CERN