Determination of laser intensity and hot-electron temperature from fastest ion velocity measurement on laser-produced plasma

Tan, T.H.; McCall, Gene H.; Williams, A. H.

doi:10.1063/1.864482

Cited by 54 publications

(20 citation statements)

References 27 publications

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“…The scaling laws of the maximum proton energy with laser power density delivered by ps-and fs-laser (Tan et al, 1984;Clark et al, 2000;Krushelnick et al, 2007) predict a maximum energy of the protons produced with the subnanosecond 3-TW laser system PALS to be about 1 MeV. Nevertheless, the use of an ion collector shielded with 8-μm Al foil, in order to absorb the extreme ultraviolet pulse inducing the "photopeak" in the IC signal , brought clear-cut evidence that the fastest protons have energy up to about 4 MeV .…”

Section: Introductionmentioning

confidence: 99%

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

et al. 2013

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A massive deuterated polyethylene target was exposed to laser intensities of about 3 × 10 16 W/cm 2 employing the 3-TW Prague Asterix Laser System (PALS). We achieved a yield of 2 × 10 8 neutrons per laser shot. Average time-of-flight signals of scintillation detectors operated in current mode reveal broad energy spectra of fusion neutrons with dominating energy of about 2.45 MeV. The energy dependence of the neutron yield shows a consistency in results of nanosecond, picosecond and sub-picosecond experiments. Here we also show that ions emitted in the backward direction from the front target surface have a multi-peak energy spectrum, which is caused by burst emission mechanisms.

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Section: Introductionmentioning

confidence: 99%

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

et al. 2013

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“…This is stronger than the ðIk 2 Þ 1=3 scaling associated with resonance absorption (RA) that is widely observed in other experiments. 4,5 In addition, it has been shown that these protons carry less than 0.3% of the laser energy. 1 Finally, the late-time behavior of the target voltage has been inferred 6 and associated return currents have been studied.…”

mentioning

confidence: 99%

Total energy loss to fast ablator-ions and target capacitance of direct-drive implosions on OMEGA

Sinenian

Zylstra

Manuel

et al. 2012

Applied Physics Letters

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Measurements of the total energy carried by fast ablator-ions in direct-drive implosions on OMEGA have been conducted using magnetic and Thomson Parabola spectrometers. It is shown that the total laser energy lost to fast ablator-ions for plastic and glass targets is comparable and that it is a modest fraction of the incident laser energy (≲1%). These measurements have been used to infer a non-linear, voltage-dependent target capacitance (∼0.1 nF) associated with the space-charge that accelerates the fast-ions.

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“…4,5 Much effort has been devoted to the study of the empirical conditions which drive these instabilities and how maximum ion energy scales with laser intensity. [6][7][8] On-target laser intensities approaching 10 15 W/cm 2 in OMEGA ICF implosions result in fast ablator ion energy endpoints of order ∼1 MeV. 9 Certain HED plasma experiments at OMEGA and the National Ignition Facility (NIF) have configurations with unique geometries and unusually high laser intensity which result in large fast ablator ion energies.…”

Section: Introductionmentioning

confidence: 99%

A novel method to recover DD fusion proton CR-39 data corrupted by fast ablator ions at OMEGA and the National Ignition Facility

Sutcliffe

Milanese

Orozco

et al. 2016

Review of Scientific Instruments

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CR-39 detectors are used routinely in inertial confinement fusion (ICF) experiments as a part of nuclear diagnostics. CR-39 is filtered to stop fast ablator ions which have been accelerated from an ICF implosion due to electric fields caused by laser-plasma interactions. In some experiments, the filtering is insufficient to block these ions and the fusion-product signal tracks are lost in the large background of accelerated ion tracks. A technique for recovering signal in these scenarios has been developed, tested, and implemented successfully. The technique involves removing material from the surface of the CR-39 to a depth beyond the endpoint of the ablator ion tracks. The technique preserves signal magnitude (yield) as well as structure in radiograph images. The technique is effective when signal particle range is at least 10 μm deeper than the necessary bulk material removal.

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Determination of laser intensity and hot-electron temperature from fastest ion velocity measurement on laser-produced plasma

Cited by 54 publications

References 27 publications

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

Total energy loss to fast ablator-ions and target capacitance of direct-drive implosions on OMEGA

A novel method to recover DD fusion proton CR-39 data corrupted by fast ablator ions at OMEGA and the National Ignition Facility

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