Monoenergetic proton backlighting for studying field evolution and areal density in HEDP

1. Detector 3 MeV 15 MeV DD D3He 0.6 ns after laser on Detector Monoenergetic proton backlighting for studying field evolution and areal density in HEDP Laser Detector R. D. Petrasso, MIT

2. Summary Monoenergetic proton backlighting is being used for studying field evolution and ρR in HEDP • MIT NLUF radiographs show details of magnetic field structure and time evolution during and long after laser illumination. • Data and LASNEX are in general agreement with the laser on, but diverge afterwards MIT MIT • Important opportunities exist for studying: • Imploded capsules • Plasma plumes/jets • Laser-hohlraum interactions • Plasma stopping power

3. Collaborators R. P. J. Town P. A. Amendt S. P. Hatchett O. L. Landen A. J. Mackinnon P. K. Patel M. Tabak LLNL C. K. Li F. H. Séguin J. A. Frenje J. R. Rygg R. D. Petrasso MIT J. P. Knauer T. C. Sangster V. A. Smalyuk LLE MIT MIT

4. T3He D ( 100) DDp D3He p (x100) DT a Multiple mono-energetic particles can be matched to the fields and ρR of an HED experiment OMEGA shot 14972 ρR : ~ 5 to ~ 300 mg/cm2 rgyro: differ by ~ X 5

5. Interaction beam mesh CR-39 “Backlighter” Backlighter drive beams CH foil A monoenergetic, isotropic source has been used for multiple, simultaneous experiments at OMEGA side-on face-on

6. LASNEX Data and LASNEX are similar with the laser on, but diverge afterwards Interaction laser on for 1 ns DATA 0.3 ns0.6 ns0.9 ns1.2 ns 1.5 ns 1.8 ns 2.3 ns 3.0 ns Submitted to PRL, Li et al.

7. Field amplitudes from data and LASNEX are similar with the laser on, but diverge afterwards laser Laser power (TW)  Bdℓ (MG-µm) LASNEX data After laser pulse, experimental magnetic diffusivity is larger than LASNEX

8. 0.3 ns

9. 0.6 ns

10. 0.9 ns

11. 1.2 ns

12. 1.5 ns

13. 1.8 ns

14. 2.3 ns

15. 3.0 ns

17. 0.3 ns

18. 0.6 ns

19. 0.9 ns

20. 1.2 ns

21. 1.5 ns

22. 1.8 ns

23. 2.3 ns

24. 3.0 ns

25. Future HED experiments will utilize monoenergetic, multiparticle, isotropic backlighters • Magnetized-Target fields and ρR • Fields and ρR in implosions – R. Kingham, CO3 :PDD • Fields of OMEGA-EP / NIF-ARC laser systems • Fields in hohlraums • Fields and modulations in RT experiments • Plasma stopping power

26. Magnetized-Targetfields and ρR (Nov. 2006)* Laser beams B  10 MG D3He implosion proton backlighter Laser beams APS talk by O. V. Gotchev et al., JO2.00012

27. B fields generated by a ring of beams around an Au tube (Feb. 2007, Fusion Science Center) Protons Au CH Side view Top view

28. Detector Mesh Cartoon image D3He backlighter Fields and ρR in cone-capsule, FI implosions

29. Fields generated by EP-plasma interactions mesh CR-39 detector “Backlighter” Backlighter drive beams CH foil OMEGA EP beam We are proposing similar experiments for NIF-ARC.

30. Fields from rings of laser beams in a hohlraum(MIT NLUF experiments in 2007) Li et al., RSI (2006)

31. Stopping power in dense, cold plasmas Uniform plasma ~ 100 mm Te ~ 50 eV ne ~ 1023 /cc D3He implosion proton backlighter Li et al., RSI (2006)

32. Summary Monoenergetic proton backlighting is being used for studying field evolution and ρR in HEDP • MIT NLUF radiographs show details of magnetic field structure and time evolution during and long after laser illumination. • Data and LASNEX are in general agreement with the laser on, but diverge afterwards MIT MIT • Important opportunities exist for studying: • Imploded capsules • Plasma plumes/jets • Laser-hohlraum interactions • Plasma stopping power