EFFECT OF TIMING NONLINEARITY OF POSITION SIGNAL ON THE OUTPUT OF LINEAR DISCHARGE TYPE ANALOG CHARGE DIVISION

Linear Discharge Type Analogue Charge Division is a method of determin ing the position of ionization in the Single Wire Position Sensitive P roportional Counter (SWPC). The division output is proportional to the position of ionization where the numerator input is the pulse (V1) ta ken from the one end of the anode and the denominator input is the sum of the pulses (V1+ V2) taken from both ends, There exists a differenc e between the timing of the peak of the numerator and denominator inpu t pulses which varies with the position and shows a non-linear charact eristic. As the peak-hold gate signal of the analogue charge division is obtained from the denominator input pulse, the effect is reflected on the output of the charge division. The timing non-linearity of the input signal and the ultimate position output non-linearity are estima ted analytically. The effect is evaluated for various parameters, such as, the intrinsic time constant of SWPC, the shaping time constant an d gate signal's delay etc. The position output for a 1.8 m long (15 mu mphi) SWPC has been obtained experimentally and the observed output no n-linearity is presented and compared with the estimation.