Scaling of nonthermal ion energy in laser-generated plasma

Wägli, Philip; Donaldson, T. P.; Lädrach, P.

doi:10.1063/1.89877

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…In tkese conditions it seems reasonable to think that they are formed of H + and C" so that the ratio mass/charge is between 1 and 2 thus increasing the estimated values. At high intensities on the other hand, it has been shown that fast ions are mainly H+ [21].…”

mentioning

confidence: 99%

Experimental studies of fast electron generation in laser-produced plasmas at 1.06, 0.53 and 0.26 μm laser wavelength

et al. 1982

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2014 Nous présentons des résultats expérimentaux sur la génération des électrons rapides dans les plasmas créés par laser à 1,06, 0,53 et 0,26 03BCm à des flux compris entre 1014 et 2 x 1015 W/cm2. Les mesures du rayonnement X et de collecteurs d'ions indiquent une température chaude donnée par TH ~ 4 x 10-7 (I03BB2/W. 03BCm2. cm-2)0,5 keV. Abstract. 2014 We present experimental results on fast electron generation in laser-produced plasmas at 1.06, 0.53 and 0.26 03BCm at laser intensities between 1014 and 2 x 1015 W/cm2. Hard X-ray and ion-collector data are in good agreement and indicate a hot temperature given by TH = 4 x 10-7 (I03BB2/W.03BCm2.cm-2)0.5 keV.

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mentioning

confidence: 99%

Experimental studies of fast electron generation in laser-produced plasmas at 1.06, 0.53 and 0.26 μm laser wavelength

et al. 1982

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“…If it is not known, the depth can be chosen from prior knowledge of fast ablator ions from similar shots and the process is repeated if the fast ablator ion tracks reappear. This technique leverages the "bulketch" procedure (an etch where the bulk removal rate is roughly equal to the track etch rate 8,13,14 ) for removing CR-39 material and erasing the tracks from the original "track-etch" (an etch which preferentially develops particle tracks), and is used in applications like track coincidence counting. 13 The track etch itself has an associated bulk removal rate, roughly 2.6 µm/h.…”

Section: Data Recovery Proceduresmentioning

confidence: 99%

“…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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“…Charged-particle measurements have demonstrated that the energies of particles from certain types of implosions exceed their theoretical birth energies by 0.5 MeV or more 4,5,17,29,30,32 ͑see Fig. 26͒.…”

Section: Particle Energy Modification Through Electrostatic Accelerationmentioning

confidence: 99%

Spectrometry of charged particles from inertial-confinement-fusion plasmas

Séguin

Frenje

et al. 2003

Review of Scientific Instruments

228

133

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High-resolution spectrometry of charged particles from inertial-confinement-fusion ͑ICF͒ experiments has become an important method of studying plasma conditions in laser-compressed capsules. In experiments at the 60-beam OMEGA laser facility ͓T. R. Boehly et al., Opt. Commun. 133, 495 ͑1997͔͒, utilizing capsules with D 2 , D 3 He, DT, or DTH fuel in a shell of plastic, glass, or D 2 ice, we now routinely make spectral measurements of primary fusion products ͑p, D, T, 3 He, ␣͒, secondary fusion products ͑p͒, ''knock-on'' particles ͑p, D, T͒ elastically scattered by primary neutrons, and ions from the shell. Use is made of several types of spectrometers that rely on detection and identification of particles with CR-39 nuclear track detectors in conjunction with magnets and/or special ranging filters. CR-39 is especially useful because of its insensitivity to electromagnetic noise and its ability to distinguish the types and energies of individual particles, as illustrated here by detailed calibrations of its response to 0.1-13.8 MeV protons from a Van de Graaff accelerator and to p, D, T, and ␣ from ICF experiments at OMEGA. A description of the spectrometers is accompanied by illustrations of their operating principles using data from OMEGA. Sample results and discussions illustrate the relationship of secondary-proton and knock-on spectra to capsule fuel and shell areal densities and radial compression ratios; the relationship of different primary fusion products to each other and to ion temperatures; the relationship of deviations from spherical symmetry in particle yields and energies to capsule structure; the acceleration of fusion products and the spectra of ions from the shell due to external fields; and other important physical characteristics of the laser-compressed capsules.

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Scaling of nonthermal ion energy in laser-generated plasma

Cited by 10 publications

References 11 publications

Experimental studies of fast electron generation in laser-produced plasmas at 1.06, 0.53 and 0.26 μm laser wavelength

Experimental studies of fast electron generation in laser-produced plasmas at 1.06, 0.53 and 0.26 μm laser wavelength

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

Spectrometry of charged particles from inertial-confinement-fusion plasmas

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