Spectral modification of laser-accelerated proton beams by self-generated magnetic fields

Robinson, A. P. L.; Foster, P. S.; Adams, Dianne M.; Carroll, D. C.; Dromey, B.; Hawkes, S.; Kar, S.; Li, Y.T.; Markey, K.; McKenna, P.; Spindloe, C.; Streeter, Matthew; Wahlström, Claes‐Göran; Xu, Ming; Zepf, Matthew; Neely, D.

doi:10.1088/1367-2630/11/8/083018

Cited by 16 publications

(15 citation statements)

References 34 publications

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“…We focus our attention on a temporal interval similar to ours (30-65 fs) and target thicknesses below 1 μm. Data obtained with our setup are coherent with previous results [22,23,[24][25][26][27] considering the moderate laser power, and with the scaling typical of the TNSA mechanism for particle acceleration [28]. Previous measurements with flat membranes produced with MEMS techniques are rare.…”

supporting

confidence: 88%

Efficient proton acceleration from a 3 TW table-top laser interacting with submicrometric mass-produced solid targets

Zaffino¹,

Seimetz²,

Cruz³

et al. 2018

J. Phys. Commun.

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Thin layer membranes with controllable features and material arrangements are often used as target materials for laser driven particle accelerators. Reduced cost, large scale fabrication of such membranes with high reproducibility, and good stability are central for the efficient production of proton beams. These characteristics are of growing importance in the context of advanced laser light sources where increased repetition rates boost the need for consumable targets with design and properties adjusted to study the different phenomena arising in ultra-intense laser-plasma interaction. We present the fabrication of sub-micrometric thin-layer gold or aluminum membranes in a silicon wafer frame by using nano/micro-electro-mechanical-system (N/MEMS) processing which are suitable for rapid patterning and machining of many samples at the same time and allowing for highthroughput production of targets for laser-driven acceleration. Obtained targets were tested for laserproton acceleration through the Target Normal Sheath Acceleration mechanism (TNSA) in a series of experiments carried out on a purpose-made table-top Ti:Sa running at 3 TW peak power and 10 Hz diode pump rate with a contrast over ASE of 10 8 .

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supporting

confidence: 88%

Efficient proton acceleration from a 3 TW table-top laser interacting with submicrometric mass-produced solid targets

Zaffino¹,

Seimetz²,

Cruz³

et al. 2018

J. Phys. Commun.

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“…Furthermore, the analysis and comparison to previous experiments 6 suggest an evident role of the temporal contrast of the laser pulse. As well created magnetic fields in the plasma can render the proton spectrum as discussed by Robinson et al 7 and can produce a few distinct peaks in the spectrum. Our observation includes a qualitatively and quantitatively different modulation with relatively high frequency.…”

Section: Introductionmentioning

confidence: 95%

The beat in laser-accelerated ion beams

et al. 2013

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Regular modulation in the ion velocity distribution becomes detectable if intense femtosecond laser pulses with very high temporal contrast are used for target normal sheath acceleration of ions. Analytical and numerical analysis of the experimental observation associates the modulation with the half-cycle of the driving laser field period. In processes like ion acceleration, the collective and laserfrequency determined electron dynamics creates strong fields in plasma to accelerate the ions. Even the oscillatory motion of electrons and its influence on the acceleration field can dominate over smoothing effects in plasma if a high temporal contrast of the driving laser pulse is given. Acceleration parameters can be directly concluded out of the experimentally observed modulation period in ion velocity spectra. The appearance of the phenomenon at a temporal contrast of ten orders between the intensity of the pulse peak and the spontaneous amplified emission background as well as remaining intensity wings at picosecond time-scale might trigger further parameter studies with even higher contrast. V C 2013 AIP Publishing LLC. [http://dx.

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“…An exclusive appearance of beam density modulation in low-energy, low-charge-state carbon ions has been discussed very recently [13]. This finding as well as other ion beam modulations [14,15] has been observed with different characteristics at specific interaction parameters.…”

Section: Introductionmentioning

confidence: 84%

Parametric study of cycle modulation in laser driven ion beams and acceleration field retrieval at femtosecond timescale

Schnürer

Braenzel

Lübcke

et al. 2019

Phys. Rev. Accel. Beams

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High frequency modulations appearing in the kinetic energy distribution of laser accelerated ions are proposed for retrieving the acceleration field dynamics at femtosecond time scale. Such an approach becomes possible if the laser-cycling field modulates the particle density in the ion spectra and produces quasi time stamps for analysis. We investigate target and laser parameters determining this effect and discuss the dependencies of the observed modulation. Our findings refine a basic mechanism, the Target Normal Sheath Acceleration, where an intense and ultrafast laser pulse produces a very strong electrical field at a plasma-vacuum interface. The field decays rapidly due to energy dissipation and forms a characteristic spectrum of fast ions streaming away from the interface. We show that the derived decay function of the field is in accordance with model predictions of the accelerating field structure. Our findings are supported by 2-dimensional particle-in-cell simulations. The knowledge of the femtosecond field dynamics helps to rerate optimization strategies for laser ion acceleration.I.

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Spectral modification of laser-accelerated proton beams by self-generated magnetic fields

Cited by 16 publications

References 34 publications

Efficient proton acceleration from a 3 TW table-top laser interacting with submicrometric mass-produced solid targets

Efficient proton acceleration from a 3 TW table-top laser interacting with submicrometric mass-produced solid targets

The beat in laser-accelerated ion beams

Parametric study of cycle modulation in laser driven ion beams and acceleration field retrieval at femtosecond timescale

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