Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-27T12:51:07.288Z Has data issue: false hasContentIssue false
  • English
  • Français

Direct drive double shell target implosion hydrodynamics on OMEGA

Published online by Cambridge University Press:  07 June 2005

GEORGE A. KYRALA ,
NORMAN DELAMATER ,
DOUGLAS WILSON ,
JOYCE GUZIK ,
DON HAYNES ,
MARK GUNDERSON ,
KENNETH KLARE ,
ROBERT W. WATT ,
WILLIAM M. WOOD  and
WILLIAM VARNUM
GEORGE A. KYRALA
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
NORMAN DELAMATER
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
DOUGLAS WILSON
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
JOYCE GUZIK
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
DON HAYNES
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
MARK GUNDERSON
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
KENNETH KLARE
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
ROBERT W. WATT
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
WILLIAM M. WOOD
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
WILLIAM VARNUM
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
Get access Rights & Permissions [Opens in a new window]

Abstract

Imploding indirect-drive double shell targets may provide an alternative, non-cryogenic path to ignition at the National Ignition Facility (NIF). Experiments are being pursued at OMEGA to understand the hydrodynamics of these implosions and the possibility of scaling it to the NIF design. We have used 40 beams from the OMEGA laser to directly drive the capsules, and we have used the remaining 20 beams to backlight the imploding shells from two different directions at multiple times. We will review the recent experiments to measure the hydrodynamics of the targets using two-view X-ray radiography of the capsules. We will present data on measured yields from the targets. We will present a measured time history of the hydrodynamics of the implosion. Experiments were pursued using direct drive in which the M-band effect (experienced in the indirect drive experiments) could be eliminated or controlled. It was learned in the direct drive experiments that the best performing capsules were those that had a thin outer layer of gold. This effectively causes M-band pre-heat effects giving implosion hydrodynamics and performance closer to the indirect drive case. We will review the methods used to radiograph the targets and the techniques used to extract useful information to compare with calculations. The effect of imperfections in the target construction will be shown to be minimal during the initial stage of implosion. The yields from the targets were observed to be uniformly low compared to indirect-drive.

Keywords

Double ShellICFIgnitionX-ray imaging
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 2 , June 2005 , pp. 187 - 192
Copyright
2005 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

This paper was presented at the 28th ECLIM conference in Rome, Italy.

References

REFERENCES

Amendt, P., Colvin, J.D., Ramshaw, J.D., Robey, H.F. & Landen, O.F. (2003). Modified Bell-Plesset effect with compressibility: Application to double-shell ignition target designs. Phys. Plasmas 10, 820–829.CrossRefGoogle Scholar
Amendt, P., Colvin, J.D., Tipton, R.E., Hinkel, D.E., Edwards, M.J., Landen, O.L, Ramshaw, J.D., Suter, L.J., Varnum, W.S. & Watt, R.G. (2002). Indirect-drive noncryogenic double-shell ignition targets for the National Ignition Facility: Design and analysis. Phys. Plasmas 9, 2221–2226.CrossRefGoogle Scholar
Boehly, R.T., Brown, D.L., Craxton, R.S., Keck, R.L., Knauer, J.P., Kelly, J.H., Kessler, T.J., Kupman, S.A., Loucks, S.J. & Letzring, S.A. (1997). Initial performance results of the OMEGA laser system. Opt. Commun. 133, 495–506.CrossRefGoogle Scholar
Campbell, E.M., Hunt, J.T., Bliss, E.S., Speck, D.R. & Drake, R.P. (1986). Nova experimental facility (invited). Rev. Sci. Instrum. 57, 2101–2106.CrossRefGoogle Scholar
Canaud, B., Fortin, X., Garaude, F., Meyer, C. & Philippe, F. (2004). Progress in direct-drive fusion studies for the Laser Megajoule. Laser Part. Beams 22, 109–114.Google Scholar
Delamater, N., Kyrala, G., Wilson, D., Watt, R., Guzik, J., Wood, W.M., Varnum, W. & Haynes, D. (2001). Progress toward ignition with non-cryogenic double-shell capsules. Proceedings of IFSA 2001, pp. 212–216 (Tanaka, K., Meyerhoffer, D. Y., Meyer-ter-Veyn, J., eds.) Paris: Elsevier.
Delamater, N., Watt, R., Varnum, W., Pollak, G., Nobile, A., Walsh, P., Evans, S., Colvin, J., Amendt, P., Turner, R., Gelbov, V., Sources, J., Stoeckl, C. & Haynes, D. (2003). Progress with double shell target implosions on Omega. Proceedings of IFSA, pp. 190–193 (Hammel, B.A., Meyerhoffer, D., Meyer-ter-Vehn, J. & Azechi, H., eds.) La Grange, IL: American Nuclear Society.
Deutsch, C. (2004). Penetration of intense charged particle beams in the outer layers of precompressed thermonuclear fuels. Laser Part. Beams 22, 115–120.Google Scholar
Garbett, W., Graham, P. & Dunne, M. (2003). An assessment of mix in OMEGA double shell capsule implosions. Proceedings of the IFSA, pp. 126–130. La Grange, IL: American Nuclear Society.
Haan, S.W., Pollaine, S.M., Lindl, J.D., Suter, L.J., Berger, R.L., Powers, L.V., Alley, W.E., Amendt, P.A., Futterman, J.A. & Levedahl, W.K. (1995). Design and modeling of ignition targets for the National Ignition Facility. Phys. Plasmas 2, 2480–2487.CrossRefGoogle Scholar
Harris, D.B. & Varnum, W.S. (1996). Results and analysis of the nova high-convergence experiment. Bull. Am. Phys. Soc. 41, 1479.Google Scholar
Honrubia, J.J., Antonicci, A. & Moreno, D. (2004). Hybrid simulations of fast electron transport in conducting media. Laser Part. Beams 22, 129–135.Google Scholar
Kyrala, G.A., Klare, K. & Workman, J. (2003). Optimizing area-backlighter performance in a difficult geometry. Rev. Sci. Instruments 74, 2182–2185.CrossRefGoogle Scholar
Lindl, J.D. (1995). Development of the indirect-drive approach to inertial confinement fusion and the target physics basis for ignition and gain. Phys. Plasmas 2, 3933–4024.CrossRefGoogle Scholar
Milovich, J.L., Amendt, P., Marinak, M. & Robey, H. (2003). Short-wavelength perturbation growth studies for NIF double-shell ignition target design. Proceedings of the IFSA, pp. 174–177, La Grange, IL: American Nuclear Society.
Milovich, J.L., Amendt, P., Marinak, M. & Robey, H. (2004). Multimode short-wavelength perturbation growth studies for the National Ignition Facility double-shell ignition target designs. Phys. Plasmas 11, 1552–2568.CrossRefGoogle Scholar
Mulser, P. & Schneider, R. (2004). On the inefficiency of hole boring in fast ignition. Laser Part. Beams 22, 157–162.CrossRefGoogle Scholar
Varnum, W.S., Delamater, N.D., Evans, S.C., Gobby, P.L., Moore, J.E., Wallace, J.M., Watt, R.G., Colvin, J.D., Turner, R. & Glebov, V. (2000). Progress toward ignition with noncryogenic double-shell capsules, vol. 84. Phys. Rev. Lett. 81, 5153–5155.CrossRefGoogle Scholar
Wallace, J.M., Murphy, T.J., Delamater, N.D., Klare, K.A., Oertel, J.A., Magelssen, G.R., Lindman, E.L., Hauer, A.A., Gobby, P., Schnittman, J.D., Craxton, R.S., Seka, W., Kremens, R., Bradley, D., Pollaine, S.M., Turner, R.E., Landen, O.L., Drake, D. & MacFarlane, J.J. (1999). Inertial confinement fusion with tetrahedral hohlraums at OMEGA. Phys. Rev. Lett. 82, 3807–3810.CrossRefGoogle Scholar
Wilson, D.C. Delamater, N.D., Pollack, G.D., Watt, R.G., &Cranfill, C.W. (2003). Mixing in double shell capsules. Proceedings of the IFSA, pp. 121–125. La Grange, IL: American Nuclear Society.
Workman, J. & Kyrala, G.A. (2001). X-ray yield scaling studies performed on the OMEGA laser. Rev. Sci. Instru. 52, 678–681.CrossRefGoogle Scholar