Development of a Nomarski-type multi-frame interferometer as a time and space resolving diagnostics for the free electron density of laser-generated plasma

Börner, Michael; Fils, J.; Frank, A.; Blažević, A.; Heßling, T.; Pełka, A.; Schaumann, G.; Schökel, Alexander; Schumacher, Dennis; Basko, M. M.; Maruhn, J. A.; Tauschwitz, A.; Roth, Markus

doi:10.1063/1.3701366

Cited by 28 publications

(13 citation statements)

References 15 publications

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“…The simulations, however, have been thoroughly benchmarked by our plasma diagnostics. Especially the time-resolved twodimensional distributions of the electron density recorded with our multiframe Nomarski interferometer [24] have been used for this purpose and the hydrodynamic simulations show an excellent agreement with the experimental results, as shown in Fig. 3.…”

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confidence: 57%

Energy Loss and Charge Transfer of Argon in a Laser-Generated Carbon Plasma

et al. 2013

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This Letter reports on the measurement of the energy loss and the projectile charge states of argon ions at an energy of 4 MeV/u penetrating a fully ionized carbon plasma. The plasma of n(e)≈10(20) cm(-3) and T(e)≈180 eV is created by two laser beams at λ(Las)=532 nm incident from opposite sides on a thin carbon foil. The resulting plasma is spatially homogenous and allows us to record precise experimental data. The data show an increase of a factor of 2 in the stopping power which is in very good agreement with a specifically developed Monte Carlo code, that allows the calculation of the heavy ion beam's charge state distribution and its energy loss in the plasma.

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confidence: 57%

Energy Loss and Charge Transfer of Argon in a Laser-Generated Carbon Plasma

et al. 2013

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“…A carbon plasma with a temperature of about 200 eV and a density up to 10 21 cm −3 was created. The plasma density could be measured by using multi-frame interferometry, 39 which proved to be in very good agreement with the results of the hydrodynamic simulations. Thus the plasma parameters were well-known, which is crucial for a subsequent detailed interpretation of the experiments.…”

Section: A Experimental Setupsupporting

confidence: 64%

A spectrometer on chemical vapour deposition-diamond basis for the measurement of the charge-state distribution of heavy ions in a laser-generated plasma

Cayzac

Frank

Schumacher

et al. 2013

Review of Scientific Instruments

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This article reports on the development and the first applications of a new spectrometer which enables the precise and time-resolved measurement of both the energy loss and the charge-state distribution of ion beams with 10 < Z < 30 at energies of 4-8 MeV/u after their interaction with a laser-generated plasma. The spectrometer is based on five 20 × 7 mm(2) large and 20 μm thick polycrystalline diamond samples produced via the Chemical Vapour Deposition (CVD) process and was designed with the help of ion-optical simulations. First experiments with the spectrometer were successfully carried out at GSI using (48)Ca ions at an energy of 4.8 MeV/u interacting with a carbon plasma generated by the laser irradiation of a thin foil target. Owing to the high rate capability and the short response time of the spectrometer, pulsed ion beams with 10(3)-10(4) ions per bunch at a bunch frequency of 108 MHz could be detected. The temporal evolution of the five main charge states of the calcium ion beams as well as the corresponding energy loss values could be measured simultaneously. Due to the outstanding properties of diamond as a particle detector, a beam energy resolution ΔEE ≈ 0.1% could be reached using the presented experimental method, while a precision of 10% in the energy loss and charge-state distribution data was obtained.

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“…2c for t =7 ns. The density profiles were benchmarked against time-resolved laser interferometry measurements25. An example of raw data is shown in Fig.…”

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confidence: 99%

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

et al. 2017

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The energy deposition of ions in dense plasmas is a key process in inertial confinement fusion that determines the α-particle heating expected to trigger a burn wave in the hydrogen pellet and resulting in high thermonuclear gain. However, measurements of ion stopping in plasmas are scarce and mostly restricted to high ion velocities where theory agrees with the data. Here, we report experimental data at low projectile velocities near the Bragg peak, where the stopping force reaches its maximum. This parameter range features the largest theoretical uncertainties and conclusive data are missing until today. The precision of our measurements, combined with a reliable knowledge of the plasma parameters, allows to disprove several standard models for the stopping power for beam velocities typically encountered in inertial fusion. On the other hand, our data support theories that include a detailed treatment of strong ion-electron collisions.

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Development of a Nomarski-type multi-frame interferometer as a time and space resolving diagnostics for the free electron density of laser-generated plasma

Cited by 28 publications

References 15 publications

Energy Loss and Charge Transfer of Argon in a Laser-Generated Carbon Plasma

Energy Loss and Charge Transfer of Argon in a Laser-Generated Carbon Plasma

A spectrometer on chemical vapour deposition-diamond basis for the measurement of the charge-state distribution of heavy ions in a laser-generated plasma

Experimental discrimination of ion stopping models near the Bragg peak in highly ionized matter

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