The knowledge of the transport and amplification parameters (drift velocity, first Townsend and attachment coefficients) of the gas mixtures used for avalanche-operated resistive-plate counters gives the possibility of better understanding the underlying physical processes of these detectors and of developing Montecarlo simulations of their behaviour. We present here a measurement of the drift velocity nu(d) and of the amplification coefficient eta in C2H2F4- isobutane mixtures. The ionization in the gas, contained in a 6 x 22 cm(2), 2 mm gap RPC, is obtained by means of a pulsed N-2 laser, via double-photon ionization. Results are presented for nu(d) and eta as a function of the applied electric field.
MEASUREMENT OF DRIFT VELOCITY AND AMPLIFICATION COEFFICIENT IN C2H2F4-ISOBUTANE MIXTURES FOR AVALANCHE OPERATED RESISTIVE PLATE COUNTERS.
GORINI, Edoardo;PRIMAVERA, Margherita
1999-01-01
Abstract
The knowledge of the transport and amplification parameters (drift velocity, first Townsend and attachment coefficients) of the gas mixtures used for avalanche-operated resistive-plate counters gives the possibility of better understanding the underlying physical processes of these detectors and of developing Montecarlo simulations of their behaviour. We present here a measurement of the drift velocity nu(d) and of the amplification coefficient eta in C2H2F4- isobutane mixtures. The ionization in the gas, contained in a 6 x 22 cm(2), 2 mm gap RPC, is obtained by means of a pulsed N-2 laser, via double-photon ionization. Results are presented for nu(d) and eta as a function of the applied electric field.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
