Length scaling of dynamic-hohlraum axial radiation.
- Los Alamos National Laboratory, Los Alamos, NM
Radiation generated within a 10-mm-long foam-target DH (dynamic hohlraum) is used for high-temperature (<200 eV) radiation-flow and inertial-confinement-fusion studies [Sanford et al., Phys. Plasmas 9, 3573 (2002)]. The length of this DH is varied from 5 to 20 mm, keeping the mass/unit length constant in an effort to study the scaling of axial radiation power with length, and better understand its production. Measurements show a greater variation in this power with length than would be expected from simple arguments [Slutz et al., Phys. Plasmas 8, 1673 (2001)]. Maximum axial power of {approx}10 TW is produced with a length of {approx}7.5 mm, similar to the typical power for the baseline 10 mm DH. The decreasing axial power (at a rate of {approx}0.65 TW per mm at longer lengths) is bounded by radiation-magnetohydrodynamic simulations [Peterson et al., Phys. Plasmas 6, 2178 (1999)] that include the development of the magnetic Rayleigh-Taylor instability in the r-z plane. The dramatic drop in axial power below 7.5 mm, by contrast, was unanticipated. This decrease suggests the presence of differing mechanisms for limiting power at short and long lengths.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 917453
- Report Number(s):
- SAND2003-0960J
- Journal Information:
- Proposed for publication in Physics of Plasmas., Journal Name: Proposed for publication in Physics of Plasmas.
- Country of Publication:
- United States
- Language:
- English
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