XXIV International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 9-16 September, 2013.

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

Joint Institute for Nuclear Research, 141980 Dubna, RussiaJoint Institute for Nuclear Research, 141980 Dubna, Russia

New multichannel charge-sensitive preamlifier with the autocalibration mode

12 strips of 3*(40mm*10mm) 300 μm each in focal plane with vertical position sensitivity

Particals’ signals:Particals’ signals: ERs, alphaERs, alphass, FF, FFEfficiencyEfficiency 87% of 487% of 4ππ for a-particles for a-particles 100% of 4100% of 4ππ for FF for FFResolutionResolution 60-90 keV for focal plane detectors60-90 keV for focal plane detectors 140-200 keV for side detectors140-200 keV for side detectors ΔΔyy = 0.9-1.9 mm for ER- = 0.9-1.9 mm for ER-αα correlations correlations and 0.5-0.9 mm for ER-SFand 0.5-0.9 mm for ER-SF

Gas-Filled Recoil SeparatorGas-Filled Recoil Separator

New FPD:New FPD: 32 strips of 2*(60*60 mm2) SSSSD, 24 strips of 6*(60*60 mm2) side detectorAnd corresponding registering system 35-70 keV for focal plane detectors35-70 keV for focal plane detectors 80-120 keV for side detectors80-120 keV for side detectors ΔΔy = 1.1-1.8 mm for ER-y = 1.1-1.8 mm for ER-αα correlations correlations and 0.5-1.2 mm for ER-SFand 0.5-1.2 mm for ER-SF

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.

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

Precision generator of the spectrometric double-pulses

of the amplitude of high stability (ΔA = 0.05%/°C).

Testing system for 16-channels preamplifier check-up

Table 1

Csourse, in pF Noise, in keV

0

38

96

220

11,4

15,5

24,3

41,4

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

Conclusion

The noise characteristic (11.4 keV, CIn=0) should be noticeably decreased

(appropriate value < 3 pF)

But:

Corresponding testing system is developed to simulate

the DSSSD response from a real charged particle

The first sample of the 16-channels spectrometric charge sensitive-preamplifier is created to be employed in the future DSSSD based measuring system

The system controlling the connection of the pulser (УПОГ) to the 16-channels preAmpl should be developed for connection upto 11 boxes (to serve 128+48 spectrometric channels)

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)

Thank you for your attention