Charged-particle acceleration and energy loss in laser-produced plasmas

Hicks, D. G.; Li, C. K.; Sèguin, F. H.; Ram, A. K.; Frenje, J. A.; Petrasso, R. D.; Soures, J. M.; Glebov, V. Yu.; Meyerhofer, D. D.; Roberts, S.; Sorce, C.; Stöckl, C.; Sangster, T. C.; Phillips, T. W.

doi:10.1063/1.1320467

Cited by 62 publications

(70 citation statements)

References 26 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results are compared to theories in common use by simulation codes. For testing theory in this regime, these results are a significant improvement on previous experiments, which utilized simpler low-density non-degenerate plasmas [26][27][28][29][30][31] or had significantly less precision [32].…”

supporting

confidence: 51%

“…The D 3 He proton spectra are Doppler-broadened due to the plasma temperature and upshifted slightly from their birth energy [Eq. (1)] due to radial electric fields around the explodingpusher implosion [29]. The initial (E i ) and final (E f ) proton energies are determined from a Gaussian fit; the downshift, or total energy loss, is ΔE ≡ E i − E f .…”

mentioning

confidence: 99%

“…The heating occurs over 1 ns, and the temperature is quiescent for another ns after the drive turns off [36]. The implosion proton source was timed so that the proton probing occurs at 1.4 ns after the onset of the heating beams, at which time electrostatic charging [29,37] of the subject target is negligible [38]. The x-ray isochoric-heating technique used in this work has been used extensively at OMEGA for dense plasma physics studies [36,[39][40][41].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Measurement of Charged-Particle Stopping in Warm Dense Plasma

et al. 2015

View full text Add to dashboard Cite

We measured the stopping of energetic protons in an isochorically heated solid-density Be plasma with an electron temperature of ∼32 eV, corresponding to moderately coupled ½ðe 2 =aÞ=ðk B T e þ E F Þ ∼ 0.3 and moderately degenerate ½k B T e =E F ∼ 2 "warm-dense matter" (WDM) conditions. We present the first highaccuracy measurements of charged-particle energy loss through dense plasma, which shows an increased loss relative to cold matter, consistent with a reduced mean ionization potential. The data agree with stopping models based on an ad hoc treatment of free and bound electrons, as well as the average-atom local-density approximation; this work is the first test of these theories in WDM plasma.

show abstract

supporting

confidence: 51%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Charged-Particle Stopping in Warm Dense Plasma

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In addition, none of these experiments probed the detailed characteristics of the Bragg peak (or peak ion stopping), which occurs at an ion velocity comparable to the average thermal electron velocity. To the best of our knowledge, only one experimental attempt to do this was made by Hicks et al [22], who measured ion stopping in a plasma with T i of ∼5 keV and n e of ∼10 22 …”

mentioning

confidence: 99%

Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas

Frenje

Grabowski

et al. 2015

Phys. Rev. Lett.

View full text Add to dashboard Cite

For the first time, quantitative measurements of ion stopping at energies around the Bragg peak (or peak ion stopping, which occurs at an ion velocity comparable to the average thermal electron velocity), and its dependence on electron temperature (T e ) and electron number density (n e ) in the range of 0.5-4.0 keV and 3 × 10 22 to 3 × 10 23 cm −3 have been conducted, respectively. It is experimentally demonstrated that the position and amplitude of the Bragg peak varies strongly with T e with n e . The importance of including quantum diffraction is also demonstrated in the stopping-power modeling of high-energy-density plasmas. A fundamental understanding of DT-alpha stopping in high-energy-density plasmas (HEDP) is essential to achieving hot-spot ignition at the National Ignition Facility (NIF) [1]. This requires accurate knowledge about the evolution of plasma conditions and the DT-alpha transport and energy deposition in plasmas for a wide range of electron (T e ) and ion temperatures (T i ) spanning from tens of eV to tens of keV, and electron number densities (n e ) from ∼10 21 to ∼10 26 cm −3 .Over the last decades, ion stopping in weakly coupled to strongly coupled HEDP has been subject to extensive analytical and numerical studies [2-10], but only a limited set of experimental data exists to validate these theories. Most previous experiments also used only one type of ion with relatively high initial energy, in plasmas with n e < 10 23 cm −3 and T e < 60 eV [11][12][13][14][15][16][17][18][19][20][21]. In addition, none of these experiments probed the detailed characteristics of the Bragg peak (or peak ion stopping), which occurs at an ion velocity comparable to the average thermal electron velocity. To the best of our knowledge, only one experimental attempt to do this was made by Hicks et al. where the birth energies shown in the parentheses are for a "zero temperature" plasma [23]. From the observed energy losses of these ions, Hicks et al. were able to describe qualitatively the behavior of the ion stopping for one plasma condition. The work described here makes significant advances over previous experimental efforts, by quantitatively assessing the characteristics of the ion stopping around the Bragg peak for different HEDP conditions. This was done through accurate measurements of energy loss of the four ions, produced in reactions (1) and (2). The new experiment, carried out at the OMEGA laser [24], involved implosions of eighteen thin SiO 2 capsules filled with equimolar deuterium-3 He gas. The capsule shells were 850 to 950 μm in diameter, 2.1 to 2.8 μm thick, and had an initial gas-fill pressure ranging from 3 to 27 atm. These capsules were imploded with sixty laser beams that uniformly delivered up to 10.6 kJ to the capsule in a 0.6-ns or 1-ns square pulse, resulting in a laser intensity on capsule up to ∼4 × 10 14 W=cm 2 [25]. Table I lists the capsule and laser parameters, along with some measured and inferred implosion parameters for a subset of four implosions discussed in detail in this...

show abstract

“…The degradation, which seems to be uniform across all the WRF spectrometers in use, will be corrected for. are primarily upshifted because of electric fields generated around the imploding capsule 15 . The accelerator has been instrumental in calibrating and re-calibrating these spectrometers.…”

Section: Current Workmentioning

confidence: 99%

An accelerator based fusion-product source for development of inertial confinement fusion nuclear diagnostics

McDuffee

Frenje

Sèguin

et al. 2008

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

A fusion product source, utilizing a 150 kV Cockraft-Walton linear accelerator, has been refurbished to provide a reliable nuclear diagnostic development tool to the national Inertial Confinement Fusion (ICF) research program. The accelerator is capable of routinely generating DD reaction rates at ~10 7 per second when using a 150 kV, 150 µA deuterium (D) beam onto an erbium (Er) or titanium (Ti) target doped with D, and D³He reaction rates at ~5×10 5 per second when using a using a 120 kV, ~100 µA D beam onto a Er or Ti target doped with 3 He. The new accelerator is currently being used in a number of projects related to the national ICF program at the OMEGA Laser Fusion Facility [T.R. Boehly et al., Opt. Commun. 133, 495 (1997)

show abstract

Charged-particle acceleration and energy loss in laser-produced plasmas

Cited by 62 publications

References 26 publications

Measurement of Charged-Particle Stopping in Warm Dense Plasma

Measurement of Charged-Particle Stopping in Warm Dense Plasma

Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas

An accelerator based fusion-product source for development of inertial confinement fusion nuclear diagnostics

Contact Info

Product

Resources

About