PULSE ANALYZING SYSTEM FOR A GRIDDED IONIZATION CHAMBER
A design method to obtain low noise amplifiers for collector pulses is described. The effect of various pulse shaping networks on minimum attainable noise charge and collection time dependence is investigated. Amplifiers having one differentiating time constant T/sub 1/ and one or two integrating networks of the same time constant T/ seem to be the best ones when T/sub 1/ is equal to T/ sub 2/. Computed minimum noise charge of a 6R-R8 input tube is 340 ion pairs on input capacitance of 30 pF. Discussion is also given for designing a resistance- capacitance-coupled low noise amplifier for grid pulses. Equating the differentiating time constant with integrating time constant gives the condition for minimum attainable noise charge as well as the condition of fairly good linearity between input and output wave forms. Optimum integrating time constants for various grid pulses lie between (0.55 to 1.1) x (collection time of grid pulses). Finally a special linear gate and pulse sh pe converter for the grid pulses are described. This converts very slow grid pulses into narrow rectangular wave forms of the same amplitude, thus enabling them to be analyzed by a commercially available biaseddiscriminator-type twenty channel pulse height analyzer. (auth)
- Research Organization:
- Rikkyo Univ., Tokyo
- NSA Number:
- NSA-16-016541
- OSTI ID:
- 4782021
- Journal Information:
- Nuclear Instr. & Methods, Vol. Vol: 14; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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