A compact electron spectrometer for hot electron measurement in pulsed laser solid interaction

Chen, H.; Patel, P. K.; Price, D.; Young, B. K.; Springer, P. T.; Berry, R. Stephen; Booth, R.; Bruns, Carson J.; Nelson, D.

doi:10.1063/1.1526929

Cited by 23 publications

(14 citation statements)

References 10 publications

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“…We find that at lower intensities, the experimental data agree with the modeling and theory well, but a discrepency develops at higher intensities (>10 19 Wcm -2 ), with the experimental temperatures being less than the predictions. A fit of the experimental data gives kT hot~I λ 2 ( ) 0.4 (3) Note that this scaling is somewhere between the ponderomotive scaling (Eq.1) and scaling presented by Beg et. al.…”

Section: Resultsmentioning

confidence: 99%

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Hot electron energy distributions from ultraintense laser solid interactions

et al. 2009

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Abstract. We present experimental data of electron energy distributions from ultra-intense (>10 19 W/cm 2 ) laser-solid interactions using the Rutherford Appleton Laboratory Vulcan petawatt laser. These measurements were made using a CCD-based magnetic spectrometer. We present details on the distinct effective temperatures that were obtained for a wide variety of targets as a function of laser intensity. It is found that as the intensity increases from 10

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Section: Resultsmentioning

confidence: 99%

“…To measure the hot electron distribution from ultra high intense short pulse laser plasma interaction, we used a magnetic electron spectrometer that has been described previously [3]. This instrument was fielded at both the Rutherford Appleton Laboratory (RAL) Vulcan petawatt laser [4] and the LLNL Jupiter laser facility.…”

Section: Introductionmentioning

confidence: 99%

Hot electron energy distributions from ultraintense laser solid interactions

et al. 2009

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“…Therefore IPs are not appropriate for high-repetition-rate experiments. The scintillator fibers [8][9][10][11] are normally placed parallel to the magnetic lines along the sides of both plates. The effects of fringe field on electron deflection trajectory are inevitable [12].…”

Section: Introductionmentioning

confidence: 99%

A flexible, on-line magnetic spectrometer for ultra-intense laser produced fast electron measurement

Yuan

Yang

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We have developed an on-line magnetic spectrometer to measure energy distributions of fast electrons generated from ultra-intense laser-solid interactions. The spectrometer consists of a sheet of plastic scintillator, a bundle of nonscintillating plastic fibers, and an sCMOS camera recording system. The design advantages include on-line capturing ability, versatility of detection arrangement, and resistance to harsh in-chamber environment. The validity of the instrument was tested experimentally. This spectrometer can be applied to the characterization of fast electron source for understanding fundamental laser-plasma interaction physics and to the optimization of high-repetition-rate laser-driven applications.

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“…In the remainder of this manuscript, we will provide detailed calculations that give estimates for current and nearly completed laser systems and specific target designs that optimize the electron temperature. In addition, we will consider the possibility of diagnosing these plasmas (Chen et al, 2003). The next step in the calculation of the number of positrons created in an ultraintense laser pulse solid interaction is to look at the cross section for pair production, given the electron energy distribution described by Eq.…”

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Electron-Positron Plasmas Created by Ultra-Intense Laser Pulses Interacting with Solid Targets

Wilks

Chen

Liang

et al. 2005

Astrophys Space Sci

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We discuss the necessary requirements to create dense electron-positron plasmas in the laboratory and the possibility of using them to investigate certain aspects of various astrophysical phenomena, such as gamma ray burst engines. Earth-based electron-positron plasmas are created during the interaction of ultra-intense laser pulses impinging on a solid density target. The fact that positrons can be generated during this interaction has already been demonstrated by Cowan et al. (2000). However, several questions concerning the number, energy, and dynamics of these positrons have yet to be answered. Through insight gathered from PIC simulations, we postulate that the e + e − plasma leaves the creation region in dense jets, with relativistic energies. In order to estimate the number density of the positrons created, we begin by first experimentally measuring the hot electron temperatures and densities of such interactions using a compact electron spectrometer. Once the electron distribution is known, the positron creation rate, , can be estimated. This same experimental diagnostic can also, with minor modification, measure the energy distribution of positrons. Initial estimates are that, with proper target and laser configurations, we could potentially create one of the densest arraignments of positrons ever assembled on earth. This experimental configuration would only last for a few femtoseconds, but would eventually evolve into astrophysically relevant pure electron-positron jets, possibly relevant to e + e − outflow from black holes.It was predicted several years ago that the large electric fields present in Ultraintense laser solid interactions can generate a large number of energetic electrons whose effective temperatures are in the keV to several MeV range (Wilks et al., 1992;Wilks and Kruer, 1997). As is well known, if an electron has a kinetic energy of at least twice the energy associated with the rest mass of itself, it has a finite probability of creating a pair (we will give actual estimates of cross sections in the next section.) With the continued increase in laser energy and intensities, the realization of what seemed at the time "far out" ideas (Liang et al., 1998) proposed only 6 years ago concerning the possibility of generating significant numbers of positrons (and hence dense electron-positron plasmas) is quickly becoming a reality. Although thought to be common in many astrophysical objects, this peculiar state of matter is not typically present on earth, due to the relatively fast annihilation rate (on the order of

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A compact electron spectrometer for hot electron measurement in pulsed laser solid interaction

Cited by 23 publications

References 10 publications

Hot electron energy distributions from ultraintense laser solid interactions

Hot electron energy distributions from ultraintense laser solid interactions

A flexible, on-line magnetic spectrometer for ultra-intense laser produced fast electron measurement

Electron-Positron Plasmas Created by Ultra-Intense Laser Pulses Interacting with Solid Targets

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