Radiation Temperature Scaling Law for Gold Hohlraum Heated with Lasers at 0.35 mm Wavelength

Jiang, Shaoen; Ke-Xu, Sun; Ding, Yongkun; Huang, Tianxuan; Cui, Yanli; Jiu-Sen, Chen

doi:10.1088/0256-307x/22/9/052

Chinese Phys. Lett.

2005

DOI: 10.1088/0256-307x/22/9/052

|View full text |Cite

Radiation Temperature Scaling Law for Gold Hohlraum Heated with Lasers at 0.35 mm Wavelength

Shaoen Jiang¹,

Sun Ke-Xu²,

Yongkun Ding³

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2011

2015

Publication Types

Select...

Article6

Relationship

Self Cite0

Independent6

Authors

Journals

Cited by 6 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Symmetry of implosions driven with the NVH is controlled through direct adjustments to the inner and outer beam power balance rather than relying on beam wavelength separations [10] and the resultant crossbeam energy transfer [11,12]. Unlike earlier research on true "vacuum" hohlraums [13][14][15], the NVH maintains a nonzero gas fill, confined by thin windows at the LEH, which both allows for cryogenic layering operation and protects the hohlraum axis from a stagnation feature caused PRL 114, …”

mentioning

confidence: 99%

First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum

Hopkins¹,

Meezan²,

Pape³

et al. 2015

Phys. Rev. Lett.

124

View full text Add to dashboard Cite

Recent experiments on the National Ignition Facility [M. J. Edwards et al., Phys. Plasmas 20, 070501 (2013)] demonstrate that utilizing a near-vacuum hohlraum (low pressure gas-filled) is a viable option for high convergence cryogenic deuterium-tritium (DT) layered capsule implosions. This is made possible by using a dense ablator (high-density carbon), which shortens the drive duration needed to achieve high convergence: a measured 40% higher hohlraum efficiency than typical gas-filled hohlraums, which requires less laser energy going into the hohlraum, and an observed better symmetry control than anticipated by standard hydrodynamics simulations. The first series of near-vacuum hohlraum experiments culminated in a 6.8 ns, 1.2 MJ laser pulse driving a 2-shock, high adiabat (α ∼ 3.5) cryogenic DT layered high density carbon capsule. This resulted in one of the best performances so far on the NIF relative to laser energy, with a measured primary neutron yield of 1.8 × 10 15 neutrons, with 20% calculated alpha heating at convergence ∼27×. Inertial confinement fusion (ICF) experiments implode millimeter-scale deuterium-tritium (DT) filled spherical capsules, compressing and heating the DT fuel to fusion conditions and releasing energy [1]. Indirect-drive ICF places the fuel-filled capsule at the center of a high-Z radiation enclosure (hohlraum) and strikes the inside walls of the hohlraum with laser power. This produces an internal bath of x rays-a radiation drive which ablates and implodes the fuel-filled capsule. The National Ignition Facility (NIF) [2,3] drives this process using 192 frequency-tripled laser beams (351 nm at 3ω), which enter a cylindrical hohlraum through laser entrance holes (LEHs) at each end. The laser beams are pointed through the LEHs to provide various angles of drive to the capsule such that the superposition of drives can be spherically symmetric throughout the implosion time.Typically, ICF experiments on the NIF have utilized plastic (CH) capsules inside gold hohlraums filled with helium at densities ranging from 0.96 [4] to 1.6 mg=cm Although vacuum hohlraums were initially considered, the long pulse duration for CH capsules led to choosing higher densities of hohlraum fill [7,8] to minimize expansion of the interior gold wall [ Fig. 1(a)] [9]. The intended effect is to maintain an open path for laser propagation to the wall for the full pulse duration.In this Letter, we report on the first experimental campaign on the NIF using near-vacuum hohlraums (NVH) to drive a high convergence cryogenic DT layered capsule implosion. A NVH has a hohlraum fill density of 0.03 mg=cm 3 helium, more than an order of magnitude lower density than conventional gas-filled hohlraums (0.96-1.6 mg=cm 3 ). Symmetry of implosions driven with the NVH is controlled through direct adjustments to the inner and outer beam power balance rather than relying on beam wavelength separations [10] and the resultant crossbeam energy transfer [11,12]. Unlike earlier research on true "vacuum" hohlraums [13][14][15], the NVH...

show abstract

mentioning

confidence: 99%

First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum

Hopkins¹,

Meezan²,

Pape³

et al. 2015

Phys. Rev. Lett.

124

View full text Add to dashboard Cite

show abstract

A novel double hohlraum target to create a moderately coupled plasma for ion stopping experiments

Ortner

Faik

Schumacher

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

X-ray conversion efficiency and radiation non-uniformity in the hohlraum experiments at Shenguang-III prototype laser facility

et al. 2014

View full text Add to dashboard Cite

The hohlraum radiation properties are studied experimentally by the Shenguang-III prototype laser facility and numerically by the two-dimensional code LARED with the multi-group radiation transfer model. The measured radiation temperature is consistent with the prediction of the simulations in a wide laser energy range, suggesting that the x-ray conversion efficiency is around 75% at the peak radiation temperature. The delicate hohlraum experiments further show that the radiation intensity inside the hohlraum is significantly non-uniform. The measured radiation flux of the hot spot region is over twice higher than that of the re-emitted wall region. Good agreements between the experiments and simulations further demonstrate the validity of the LARED code to study the hohlraum radiation properties.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Radiation Temperature Scaling Law for Gold Hohlraum Heated with Lasers at 0.35 mm Wavelength

Cited by 6 publications

References 20 publications

First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum

First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum

A novel double hohlraum target to create a moderately coupled plasma for ion stopping experiments

X-ray conversion efficiency and radiation non-uniformity in the hohlraum experiments at Shenguang-III prototype laser facility

Contact Info

Product

Resources

About