1. Preliminary Processing of the
Signals in a Nuclear Physics
Experiment
Supervisor: Dr. Alexey Anatolievich Voinov
Participants: Jakub Navařík 1
Brett Rosiejka 2
Leo Schlattauer 1
1 Plucky University Olomouc
Faculty of Science
Department of Experimental Physics
17. Listopadu 12, Olomouc, Czech Republic
2 University of Wisconsin – La Crosse
Department of Physics
1725 State Street, La Crosse Wisconsin 54601
United States of America

2. Synopsis
• Flerov Laboratory of Nuclear Reactions (FLNR)
• Dubna Gas-Filled Recoil Separator (DGFRS)
• Schematics of Amplifiers

3. Founder Georgy Nikolayevich Flerov
• 1913-1990
• Flerovium 114, 2012
Element 105, Dubnium
• 1997
Synthesis and Properties of Superheavy Nuclei
• Vladimir Utyonkov, Head of Sector
• Alexey Voinov, Head of Measuring Equipment
Group
• Currently Z = 117
• Dubna Gas-Filled Recoil Separator (DGFRS)
• 1989
• Elements 108, 110, 112, 113, 114, 115, 116, 118
Flerov Laboratory of Nuclear
Reactions est. 1957

4. Island of Stability

5. Example
Decay Chains
Observed

6. Separation of Nuclear Reaction Products
291115 (complete fusion)
48Ca (Beam) + 243Am (Target)
Scattering products
Transfer reaction products

7. Dubna Gas-Filled Recoil Separator

8. Dubna Gas-Filled Recoil Separator

9. Focal Plane Detector
Consists of Double-Sided Silicon Strip Detector (DSSSD)
Old New
For the new DSSSDs, modifications of the
current electronics system are required.
• Three 40 x 40 mm detectors
• Total of 12 vertical strips
• Total of 20 horizontal cells
• Equal to 240 single detectors
with space resolution ≈ 20 mm2
• Single 120 x 120 mm detector
• 128 vertical strips
• 48 horizontal cells
• Equal to 6144 single detectors
with space resolution ≈ 1 mm2

10. DETECTOR
183 channels
SPLITTER
a) Digital detection system based on PXI
modulesPRE
AMP
b) Analog detection system developed in
Dubna
…and much more!

11. Why both systems in parralel?
• For comparison and verification of results
obtained by two totally different systems.
• Only the analog system can execute
experimental stop-beam conditions in real
time.

12. focalplane
detector
Preamplifier
Coder for horizontal and vertical
strips with fast discriminator.
Returns position where nuclei was
implanted.
register
PLC CAMAC
controller
Spcetroscopic
amplifier
PC
with
software
Block Diagram of Analog Detection System being Developed in Dubna
position logic code in x,y
addressofevent
to A
A
α range
SF range
multiplexer
withcoder
ADconverterADconverter
memory
memory
183channels
183
channels
128 channel coder
48channels
fromfrontsidedetector
48
channels
48
channels
1 ch. of event which is in discrimination window and
has to be measured
Asignal from 1 ch.
VITO detector
code of the selected strip which has
signal in the discrimination window
trigger
trigger
AD converter memory
trigger
trigger system
multiplexer
withcoder
code of strip

13. focalplane
detector
Preamplifier
Coder for horizontal and vertical
strips with fast discriminator.
Returns position where nuclei was
implanted.
register
PLC CAMAC
controller
Spcetroscopic
amplifier
PC
with
software
position logic code in x,y
addressofevent
to A
A
α range
SF range
multiplexer
withcoder
ADconverterADconverter
memory
memory
183channels
183
channels
128 channel coder
48channels
fromfrontsidedetector
48
channels
48
channels
1 ch. of event which is in discrimination window and
has to be measured
Asignal from 1 ch.
VITO detector
code of the selected strip which has
signal in the discrimination window
trigger
trigger
AD converter memory
trigger
trigger system
multiplexer
withcoder
code of strip
Block Diagram of Analog Detection System being Developed in Dubna

14. Schematic Diagram of One
Channel Amplifiers

15. Realization

16. Realization Continued

17. Examination of Amplifier

18. We deeply appreciate your
kind attentiveness