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A.A. Voinov, V.G. Subbotin, A.M. Zubareva

XXI V International Symposium on Nuclear Electronics and Computing . Bulgaria, Varna, 9 -1 6 September, 20 13. New multichannel charge-sensitive preamlifier with the autocalibration mode. A.A. Voinov, V.G. Subbotin, A.M. Zubareva Joint Institute for Nuclear Research, 141980 Dubna, Russia.

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A.A. Voinov, V.G. Subbotin, A.M. Zubareva

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  1. XXIV International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 9-16 September, 2013. New multichannel charge-sensitive preamlifier with the autocalibration mode A.A. Voinov,V.G. Subbotin,A.M. Zubareva Joint Institute for Nuclear Research, 141980 Dubna, Russia

  2. 12 strips of 3*(40mm*10mm) 300 μm each in focal plane with vertical position sensitivity Particals’ signals:ERs, alphas, FF Efficiency 87% of 4π for a-particles 100% of 4π for FF Resolution 60-90 keV for focal plane detectors 140-200 keV for side detectors Δy = 0.9-1.9 mm for ER-α correlations and 0.5-0.9 mm for ER-SF New FPD: 32 strips of 2*(60*60 mm2) SSSSD, 24 strips of 6*(60*60 mm2) side detector And corresponding registering system 35-70 keV for focal plane detectors 80-120 keV for side detectors Δy = 1.1-1.8 mm for ER-α correlations and 0.5-1.2 mm for ER-SF Gas-Filled Recoil Separator

  3. Front and Rear views of the new DSSSD (48 by 128 strips, 1mm width each) with 48*128 mm2. 48*128 strips granularity equals to ~3000 individual detector cells.

  4. OpAmpl – ADA4817-1, ultrahigh speed (1 GHz) voltage feedback amplifiers with FET inputs, low noise (4nV/Hz), Supply current per amplifier: 19 mA– www.analog.com

  5. Testing system for 16-channels preamplifier check-up Precision generator of the spectrometric double-pulses of the amplitude of high stability(ΔA = 0.05%/°C).

  6. Main PUDIK characteristics (no tests for stability were performed) • Input/Output polyarity - Inverted • Energy sensitivity (Si) - 8 mV/MeV • Negative feedback constant - 22 MΩ/5.6 pF • Noise characteristics - See Table 1 • Power supply - +/-6V

  7. Conclusion • The first sample of the 16-channels spectrometric charge sensitive-preamplifier is created to be employed in the future DSSSD based measuring system • Corresponding testing system is developed to simulate the DSSSD response from a real charged particle But: • The noise characteristic (11.4 keV, CIn=0) should be noticeably decreased (appropriate value < 3 pF) New more complicated PCB’s design is needed (with probable enlarge size of the PCB and the box) Definitly a fast FET transisitor needed at the Input with good noise characteristic (~1 pF/√Hz) • The system controlling the connection of the pulser (УПОГ) to the 16-channels preAmplshould be developed for connection upto 11 boxes (to serve 128+48 spectrometric channels)

  8. Thank you for your attention

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