A multi-anode transverse field gas ionization chamber

A transverse field gas ionization chamber for particle identification at the Radioactive Ion Beam Line in Lanzhou (RIBLL) is described. It consists of cathode, Frisch grid and 4 anodes (20, 40, 80,136mm). The MAIC was measured at 10(4)Pa of operating gas P10(10% CH4 + 90% Ar). By setting the voltage of anode at 100V, the plateau of the MAIC is 700V varing from -300V to -1000V. With voltage of anode at + 225V and the voltage of cathode at -700V, the energy resolution of MAIC is 41.1 keV for 1.30 MeV (244) Cm a and relative energy resolution (DeltaE/E) is 3.16% at the fourth anode.