1. Petersburg Nuclear Physics Institute
DOUBLE POLARIZED DD-FUSION
P. Kravtsov, N. Chernov, K. Grigoryev, I. Ivanov, E. Komarov,
L. Kotchenda, M. Mikirtychyants, S. Sherman, V. Trofimov,
A. Vasilyev, M. Vznuzdaev
Petersburg Nuclear Physics Institute, Gatchina, Russia
R. Engels, L. Kroell, F. Rathmann, H. Stroeher
IKP, Forschungszentrum Juelich, Germany
H. Paetz Gen. Schieck
IKP, University of Cologne, Germany
M. Marusina, S. Kiselev, P. Monich, I. Harrasov
University ITMO, St.Petersburg, Russia
P. Kravtsov

2. Participating Institutions
Petersburg Nuclear Physics Institute, Russia
Forschungszentrum Jülich, Germany
Cologne University, Germany
KVI, Gronningen, Netherlands
University ITMO, St.Petersburg, Russia
Ferrara University, Italy (?)
Financial support:
ISTC project #3881
Deutsche Forschungsgemeinschaft
Russian Academy of Science
P. Kravtsov

3. Double polarized dd-fusion
The main 4-nucleon fusion reaction – good testing ground for
microscopic calculations
t + p
d + d
3He + n
Systematic measurements of the spin-correlation coefficients
Cross section increase
[R.M. Kulsrud et al., Phys. Rev. Lett. 49, 1248 (1982)]
3He+d → 4He+p : Factor ~1.5 at 430 keV
[Ch. Leemann et al., Annals of Phys. 66, 810 (1971)]
Neutrons suppression
Quintet suppression factor
[H. Paetz gen. Schieck, Eur. Phys. J. A 44, 321–354 (2010)]
[Deltuva and Fonseca, Phys. Rev. C 81 (2010)]
Trajectories control of the fusion products
United efforts on the practical use of the polarized fusion
Persistence of the Polarization in a Fusion Process
[J.-P. Didelez and C. Deutsch. Few-Body Conference, Bonn (2009)]
P. Kravtsov

4. History B.P. Ad’jasevich, V.G. Antonenko
Measurement of the polarization
correlation coefficients in reactions
2H(d, p)3H and 2H(d, n)3He
at low energies.
1976
P. Kravtsov

5. Unpolarized cross sections
R. E. Brown, N. Jarmie, Phys. Rev. C 41 N4 (1990)
P. Kravtsov

6. Data situation Tagishi et al.; Phy. Rev. C 46 (1992) 1155-1158
[Analysing Powers: 2H(d,p)3H, solid target]
Becker et al.
Few Body Sys. 13 (1992)
[Analysing Powers]
Imig et al.
Phys.Rev. C 73 (2006)
[Spin-Transfer Koeff.]
All experiments were performed at solid targets
P. Kravtsov

7. The Quintet suppression factor
Deltuva and Fonseca, Phys. Rev. C 81 (2010)
Direct experiment is needed!
P. Kravtsov

8. ? Electron screening Astrophysical S-Factor:
F. Raiola et al.; Eur. Phys. J. A 13, 377 (2002) ?
Coulomb Potential
Distance
Nuclear Potential
P. Kravtsov

9. Adjacent experiments
Persistence of the Polarization in a Fusion Process.
J.-P. Didelez and C. Deutsch. Few-Body
Conference, Bonn (2009).
Basic study on polarized D-D fusion.
N. Horikawa. International Symposium on
Polarized Target and its Application (2008).
P. Kravtsov

10. Experimental setup Luminosity: 1.3∙1025 1/cm2 s
→ count rate: ~ 54/h (30keV)
→ 1 week of beam time
P. Kravtsov

11. Hyperfine states
P. Kravtsov

12. Count rate Typical charged-particle spectra [Becker et al.
Few Body Sys. 13 (1992)]
0.82 MeV
1.01 MeV
3.02 MeV
P. Kravtsov

13. SAPIS ABS
P. Kravtsov

14. SAPIS ABS Vacuum system Dissociator design Transition units design
Magnet system design
P. Kravtsov

15. ABS: Magnet system
Magnet N1
P. Kravtsov

16. POLIS Ion source
P. Kravtsov

17. POLIS. Control system. compact (high channel density)
widely used in our systems at BNL, PSI, GSI and AIRBUS test rig
VERY old (is not supported 10 years)
failed to work in KVI before departure
P. Kravtsov

18. Experimental hall
P. Kravtsov

19. Experimental hall. Equipment layout
P. Kravtsov

20. Electronics platform
P. Kravtsov

21. Detector system Proof of principle: L. Kroell. Diploma thesis, 2010.
4- detector setup with 60% filling
~300 Hamamatsu Si PIN photodiodes (S3590)
1cm2 active area
300um depletion layer
good energy resolution (17keV for 1MeV Carbon ions at RHIC)
Proof of principle:
L. Kroell.
Diploma thesis, 2010.
FZJ – RWTH.
Readout electronics requirements:
320 PIN diodes
≤ 1kHz total count rate
Amplitude analyzer
Common clock for off-line coincidence analysis
Custom CSP (Charge Sensitive Preamplifiers)
P. Kravtsov

22. PIN-diode measurements
Alpha-source:
Pu239 + Pu240 = 80.4%
Pu238 + Am241 = 19.6%
Dead layer measurements:
P. Monich.
Bachelor thesis, 2011.
ITMO University.
D=0.72(1.66)μm
P. Kravtsov

23. PIN diode measurements
XY surface scan of the PIN diode
P. Kravtsov

24. Initial detector system
4- rotational gimbal support
step motors with good angular resolution (~0.01 degree)
Initial detector system:
I. Harassov.
Diploma thesis, 2011.
ITMO University.
P. Kravtsov

25. Interaction chamber
P. Kravtsov

26. Working Plan Infrastructure January 2012
Experimental hall preparation March 2011
Platform for electronics May 2011
Water cooling system December 2011
Assemble and run the POLIS source January 2012
Mechanical assembling June 2011
Vacuum + water distribution system December 2011
Control system December 2011
Adjustments and tuning January 2012
Solid target experiment Spring 2012
Upgrade of the SAPIS ABS Fall 2012
Vacuum system Spring 2012
Magnet system design February 2012
Dissociator design March 2012
Transition units design May 2012
ABS tests and tuning Fall 2012
Detector system Fall 2012
Interaction chamber April 2011
Mechanical support design Spring 2012
Readout electronics design Spring 2012
Electronics production Fall 2012
P. Kravtsov