Plasma scale-length effects on electron energy spectra in high-irradiance laser plasmas

Culfa, O.; Tallents, G. J.; Rossall, A. K.; Wagenaars, E.; Ridgers, C. P.; Murphy, C. D.; Dance, R. J.; Gray, R. J.; McKenna, P.; Brown, Clair; James, Steven; Hoarty, D. J.; Booth, N.; Robinson, A. P. L.; Lancaster, K. L.; Pikuz, S. A.; Faenov, A. Ya.; Kämpfer, T.; Schulze, K. S.; Uschmann, I.; Woolsey, N. C.

doi:10.1103/physreve.93.043201

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…It is seen that measured maximum energies increase up to a certain point and start decreases again which is in agreement with previous studies undertaken by Ross et al [13]. We have explained measured hot electron spectra and showed the decrease on hot electron temperature which is relevant to the plasma scale length and laser filamentation in plasmas [17,22]. These laser filamentations are also effect generated proton energy and temperature which explains the decrease on proton energy and temperature after a certain scale length.…”

Section: Resultssupporting

confidence: 91%

“…The produced hot electron flux with the energies up to 200 MeV is accelerated through to the laser axis (40 • to the target normal and RCF stack) [22]. Protons are attenuated in the stack of RCF films as they penetrate through the different films, with the exposure of the films giving the energy of proton flux sufficient to transmit through the RCF films.…”

Section: Resultsmentioning

confidence: 99%

“…The probe beam was transverse to the target surface passing through the plasma generated by the pre pulse laser target interaction. In previous studies [22], we have discussed in detail how to measure and analyse plasma scale length from the shadowgraphy images obtained using the optical probe.…”

Section: Methodsmentioning

confidence: 99%

“…The scale-length of the plasma formed by the pre-pulse at the time of the high power laser irradiance is measured using transverse probe shadowgraphy. Electron energy and temperature measurements with the controlled density scale-length have been reported by [17,22]. Experimentally measured proton temperature and number of generated protons have also been studied depending on measured plasma scale length and target thickness previously [26].…”

Section: Introductionmentioning

confidence: 99%

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Measurements of Proton Energy Spectra Generated by Ultra Intense Laser Solid Interactions

Culfa

2017

SDÜ Fen Bil Enst Der

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In this study, we have presented proton energy spectra produced by such high irradiance (10 20 W/cm 2 ) lasers interacting with a pre formed plasma in front of the target and with solid targets without a pre formed plasma. The effects of the target thickness and the generated plasma on the maximum energy and proton numbers are assessed. It is observed that experimentally measured maximum proton energy and number of protons have a dependence on target thickness and preformed plasma scale length produced by prepulse laser with the irradiance of ∼ 10 12 W/cm 2 . 2D EPOCH PIC code simulation results of the energy spectra of protons are in a good agreement with measured experimental results. Ultra Yogun Lazer-Katı Etkileşimleri Sonucu Üretilen Proton Enerji Spektrumlarınıṅ IncelenmesiAnahtar Kelimeler Proton üretimi, Lazer madde etkileşimleri, Ultra yogun lazerler Özet: Yapılan bu çalışmada,ultra yogun lazerlerin (10 20 W/cm 2 ) farklı kalınlıktaki katı hedeflerle etkileşimi sonucu üretilen protonlar incelenmiştir. Ayrıca ana lazerden önce kullanılan ve younlugu ∼ 10 12 W/cm 2 seviyesinde olan ikincil lazerle önceden oluşturul-muş plazmaların, üretilen protonların enerji spektrumları üzerindeki etkisi araştırılmıştır. Ana lazer tarafından ateşlenen katı hedeflerin kalınlıgının, üretilen protonların yogunlugu ve maksimum enerjilerine olan etkisi, ayrıca katı maddelerin ön kısmında (lazerle etkileşimin gerçekleştigi bölge) ikincil lazer tarafından önceden oluşturulan plazmaların hızlandırılan protonlar üzerindeki etkisi çalışılmıştır. 2 boyutlu EPOCH PIC simülasyon-larının sonuçları deneysel verilerin sonuçları ile karşılaştırılmış ve elde edilen bulguları destekledigi gözlemlenmiştir.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurements of Proton Energy Spectra Generated by Ultra Intense Laser Solid Interactions

Culfa

2017

SDÜ Fen Bil Enst Der

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“…The amplitude of the magnetic fields at the target rear depends on the scale-length of the rear-side plasma. Consequently, 1D radiation hydrodynamics simulations using the HYADES code 41 were performed to obtain the scale-length of the plasma density profile at the target rear, assuming that the target rear was volume-heated to a temperature consistent with that observed for similar targets in previous experiments under similar conditions 42 , 43 . These simulations were run for a CH target for the time-period (1-10) ps following the main interaction pulse and the expansion velocity of the critical surface was found to be fairly constant at 9 × 10 6 cm/s during the simulation period equivalent to a scale-length of <1 μ m at 10 ps at the target rear, consistent with shadowgraphy measurements).…”

Section: Methodsmentioning

confidence: 99%

Micron-scale mapping of megagauss magnetic fields using optical polarimetry to probe hot electron transport in petawatt-class laser-solid interactions

Chatterjee

Singh

Robinson

et al. 2017

Sci Rep

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The transport of hot, relativistic electrons produced by the interaction of an intense petawatt laser pulse with a solid has garnered interest due to its potential application in the development of innovative x-ray sources and ion-acceleration schemes. We report on spatially and temporally resolved measurements of megagauss magnetic fields at the rear of a 50-μm thick plastic target, irradiated by a multi-picosecond petawatt laser pulse at an incident intensity of ~1020 W/cm2. The pump-probe polarimetric measurements with micron-scale spatial resolution reveal the dynamics of the magnetic fields generated by the hot electron distribution at the target rear. An annular magnetic field profile was observed ~5 ps after the interaction, indicating a relatively smooth hot electron distribution at the rear-side of the plastic target. This is contrary to previous time-integrated measurements, which infer that such targets will produce highly structured hot electron transport. We measured large-scale filamentation of the hot electron distribution at the target rear only at later time-scales of ~10 ps, resulting in a commensurate large-scale filamentation of the magnetic field profile. Three-dimensional hybrid simulations corroborate our experimental observations and demonstrate a beam-like hot electron transport at initial time-scales that may be attributed to the local resistivity profile at the target rear.

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The effect of laser contrast on generation of highly charged Fe ions by ultra-intense femtosecond laser pulses

et al. 2017

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Plasma scale-length effects on electron energy spectra in high-irradiance laser plasmas

Cited by 24 publications

References 29 publications

Measurements of Proton Energy Spectra Generated by Ultra Intense Laser Solid Interactions

Measurements of Proton Energy Spectra Generated by Ultra Intense Laser Solid Interactions

Micron-scale mapping of megagauss magnetic fields using optical polarimetry to probe hot electron transport in petawatt-class laser-solid interactions

The effect of laser contrast on generation of highly charged Fe ions by ultra-intense femtosecond laser pulses

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