XXIV International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 9-16 September, 2013. A.A. Voinov,V.G. Subbotin,A.M. Zubareva A.A.

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Presentation transcript:

XXIV International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 9-16 September, A.A. Voinov,V.G. Subbotin,A.M. Zubareva A.A. Voinov, V.G. Subbotin, A.M. Zubareva Joint Institute for Nuclear Research, 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: ERs, alphas, FF Efficiency 87% of 4π for a-particles 87% of 4π for a-particles 100% of 4π for FF 100% of 4π for FFResolution keV for focal plane detectors keV for focal plane detectors keV for side detectors keV for side detectors Δy = mm for ER-α correlations Δy = mm for ER-α correlations and mm for ER-SF and mm for ER-SF Gas-Filled Recoil Separator New FPD: 32 strips of 2*(60*60 mm 2 ) SSSSD, 24 strips of 6*(60*60 mm 2 ) side detector And corresponding registering system keV for focal plane detectors keV for side detectors keV for side detectors Δy = mm for ER-α correlations Δy = mm for ER-α correlations and mm for ER-SF and mm for ER-SF

Front and Rear views of the new DSSSD (48 by 128 strips, 1mm width each) with 48*128 mm 2. 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 –

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 C sourse, in pFNoise, in keV ,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, C In =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 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

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Dubna Gas Filled Recoil Separator 12 strips 300μm 40mm*10mm each in focal plane Particals’ signals: EVRs, alpha, FF Measurement: energy, (x,y), time Efficiency 87% of 4p for a-particles 87% of 4p for a-particles 100% of 4p for FF 100% of 4p for FF

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Block diagram of the measuring electronics (only one detector circuit is shown completely).

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Diagram of the logic of the registration of nuclear reactions products at DGFRS

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Energy spectrum of a-particles detected in the natYb + 48Ca reaction. Spectrum of total energies deposited by the fission fragments of 252No implants as measured by the both focal-plane and side detectors (blue line) and by the focal-plane detector only (red line). 48 Ca + nat. Yb Pb 48 Ca

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, ER-a and ER-SF time intervals measured for 217Th and 252No produced in 48Ca-induced reactions with natYb and 206Pb, respectively. Dependence of ER-a position resolution (FWHM) on the amplitude of a-particle signal. The position resolution was derived by examining the atYb+48Ca data for escaping a particles depositing varying mounts of energy in the focal-plane detector. Spectra of measured energies of implants 217Th (left), 252No (right) and superheavy nuclei with Z= (middle). Solid histogram shows energies of Z=117 recoils observed in the reaction 249Bk+48Ca. Distributions of position deviations of ER-a and ER-SF signals measured for 217Th and 252No produced in 48Ca-induced reactions with natYb and 206Pb,respectively.

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, a) Total energy spectra of beam-on a-like signals and beam-off particles. Energy spectra recorded during the 252 MeV 48Ca+ 249Bk run (E=39MeV). b) Total fission-fragment energy spectra, both beam-on and beam-off. The arrows show the energies of events observed in the correlated decay chains.

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Results High efficiency of rare decays detecting Good energy and position resolution (35 keV and 0.9 mm for the unirradiated detectors) Low system “dead-time” T = 8 us Operating in low background conditions for the descendant decays Future New double side silicon strip detector array (x: 128 channels, y: 48 channels – 6144 cells) Apropriate modern digital electronics (based on PIXIE-16) “dead-time” less 1 us Operating in better background conditions

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, Thank you for the attention

XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, September, a) Spectra of measured energies of Z= nuclei (grey) and element 117 implants (black). Spectrum of 252No recoils is shown for comparison. b) Position deviations of all signals (ERs, a-particles, and SF fragments) in the observed decay chains of Z=117 isotopes. The position of one a-article deviates from the average value by more than 2 mm, caused by the low energy, Ea=1.2 MeV, deposited in the focal-plane detector resulting in degraded position resolution. c) Spectrum of total energies deposited by the fission fragments of 252No measured by the both focal-plane and side detectors. Fission-fragment energies of 281Rg observed in the decay chains of are shown by arrows. d) Relative time intervals of all events in the observed decay chains of (l=ln2/T1/2) compared with the average half-lives assigned to the appropriate nuclides.