X-ray confinement in a gold cavity heated by 351-nm laser light

It is well known that pulsed lasers can generate higher pressures than any other laboratory method if their radiation is focussed onto solid matter. However, the coherence of laser light and the resulting problem of nonuniform energy deposition due to interference effects in the beam represented a severe obstacle for quantitative use in high pressure physics. This problem has now been overcome by converting the laser light into incoherent thermal soft x-rays in laser-heated cavities. Experiments with the ASTERIX laser in which uniform shock waves with pressures of 8 Megabars have been generated are described in detail. It is concluded that lasers may become a quantitative new tool in high pressure physics.

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“…8 n s / 0 . 3 5 p pulses from the GEKKO XI1 laser at Osaka University radiation temperatures of more than 200 eV have been measured [20].…”

Section: Laser-generation Of Soft X-rays In Cavitiesmentioning

confidence: 99%

Lasers in High Pressure Shock Wave Research

Löwer

Sigel

1993

Contrib. Plasma Phys.

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“…Quantitative modeling of the injection of several laser beams into the cavity, the subsequent conversion of the laser light into soft x-rays, and the resulting spatial distribution of energy deposition possess considerable difficulties, owing to the complicated geometry and the rather involved physics of laser light conversion (Nishimura, 1991). In order to reach a more tractable model, the laser is replaced by a fictitious source of x-rays located inside the cavity wall.…”

Section: Numerical Modelsmentioning

confidence: 99%

An Investigation of Bremsstrahlung Reflection in a Dense Plasma Focus (DPF) Propulsion Device

Thomas¹,

Miley²,

Mead³

2006

AIP Conference Proceedings

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force ABSTRACTThe dense plasma focus device is one of the few fusion systems that is capable of burning advanced fuels such as D -3 He and p -11 B. A study has been performed and shown that three main requirements must be satisfied to reach breakeven for DPF fusion: a high Ti/Te ration (~ 20), an order of magnitude higher pinch lifetime, and the reflection and absorption if at least 50% Bremsstrahlung radiation. The latter issue is the focus of this report, and a literature search has been performed on laser-driven fusion radiation cavities, multilayer reflectors, and their application to Bremsstrahlung radiation reflection is presented. Additionally, the results found are compared to those assumed in the earlier DPF study bring p-11 B. AFRL/PRSP, 10 E. Saturn Blvd., Edwards AFB, rethomas@uiuc.edu Abstract. The dense plasma focus device is one of the few fusion systems that is capable of burning advanced fuels such as D -3 He and p -11 B. An study has been performed and shown that three main requirements must be satisfied to reach breakeven for DPF fusion: a high Ti/Te ration (~ 20), an order of magnitude higher pinch lifetime, and the reflection and absorption if at least 50% Bremsstrahlung radiation. The latter issue is the focus of this report, and a literature search has been performed on laser-driven fusion radiation cavities, multilayer reflectors, and their application to Bremsstrahlung radiation reflection is presented. Additionally, the results found are compared to those assumed in the earlier DPF study bring p-11 B.

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Present Status and Future Prospects of Laser Fusion Research at Osaka

Yamanaka

1997

Current Trends in International Fusion Research

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X-ray confinement in a gold cavity heated by 351-nm laser light

Cited by 35 publications

References 26 publications

Lasers in High Pressure Shock Wave Research

Lasers in High Pressure Shock Wave Research

An Investigation of Bremsstrahlung Reflection in a Dense Plasma Focus (DPF) Propulsion Device

Present Status and Future Prospects of Laser Fusion Research at Osaka

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