Ибратжон Хатамович Алиев

Все науки. №10, 2024. Международный научный журнал


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A1422 output, using a digital oscilloscope from Tektronix, model TBS1072B [27]. Thus, we determine the relation between the amplitudes of the A1422 input and output pulses, i. e. its amplification factor (F). Table 1 presents the amplification factor (F), obtained for each electronic chain (Vout/Vin) and the average value (F), obtained for each A1422. Since preamplifiers invert the pulse, the Table 1 refers to absolute values. In Table 1, the A1422 are discriminated by their series number: 13323 and 13324. From Ta ble 1, the F average values are 1.075 (34) for the A1422—13323 and 1.084 (39) for the A1422—13324. Relative uncertainties are, respectively, 3.2% and 3.6%. Con sidering statistical errors (standard deviation (σ)), both values are compatible in 1σ. As an example, Figure 4 plots the relation between the input and output pulse heights, with the respective fit, for the first electronic chain (1) of the

      (a) Output rise time as a function of the input rise time. Input pulses with fast rise times (<15 ns), saturate at around 13 ns

      (b) Outputdecaytimeasafunctionoftheinput decaytime.Forlonginputpulses, thedecaytime saturatesataround140µs.

      Figure 5: Timing performance of the A1422 preamplifier.

      The A1422 preamplifier data sheet [17] specifies a rise time tr <25 ns and a decay time td = 50 µs. Here, the decay time refers to the time it takes for the pulse to fall from the 100% to the 50% of its maximum.

      Following Figure 3 scheme, using the digital detector emulator DT4800 [26], the timing performance of the A1422 preamplifiers has been characterized. The rise time of the input pulses represents the charge collection time and it depends on the specific detector. We used the DT4800 emulator to create input pulses with different rise times, studying the A1422 output pulses. The results can be seen in Figure 5a. For input pulses with fast rise times (<15 250 ns), the output pulse rise time remains constant at tr ≈ 13 ns. Therefore, when the input pulses have fast rise times – which is standard when detecting alphas or heavy ions – the characteristic A1422 output rise time (tr ≈ 13 ns) is in agreement with the datasheet value (tr <25 ns). Likewise, the DT4800 emulator can generate input pulses with different decay times, which allows for studying the respective A1422 output pulses. The results are represented in Figure 5b. It can be verified that for long input pulses – which would correspond to alphas or heavy ions – the decay time of the A1422 output pulses remains constant at td ≈ 140 µs. Taking into account foot note 1 and converting to CAEN’s above-mentioned criterion leads to td ≈ 46 µs, that can be compared to the datasheet value (td = 50 µs)

      Figure 6: Spectrum obtained for different pulse heights emulated from DT4800, with the setup of Figure 3. Each peak has been fitted using a Gaussian model in order to determine the FWHM

      3.2. V1725S digitizer and spectral response

      3.2.1. Linearity with an emulated pulse

      Using the DT4800 in Figure 3, the linearity of the 16 MARS electronic and acquisition chains has been tested.

      We characterized the relation between the input pulse height and the spec trum channel. The total number of spectrum channels was set to 214 = 16384.

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