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5 Dec 2011

Volume 99, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 99, 233701 (2011); http://dx.doi.org/10.1063/1.3651756 (3 pages)

Melis Hazar, Robert L. Steward, Jr., Chia-Jung Chang, Cynthia J. Orndoff, Yukai Zeng, Mon-Shu Ho, Philip R. LeDuc, and Chao-Min Cheng
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Forward and backward cavity pressure acceleration of macroparticles

S. Borodziuk, T. Chodukowski, Z. Kalinowska, A. Kasperczuk, T. Pisarczyk, J. Ullschmied, E. Krousky, M. Pfeifer, K. Rohlena, J. Skala, and P. Pisarczyk

Appl. Phys. Lett. 99, 231501 (2011); http://dx.doi.org/10.1063/1.3662972 (3 pages)

Online Publication Date: 5 December 2011

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In this paper we present our new results obtained during the experiment performed on Prague Asterix Laser System. We used cavity pressure acceleration method [Borodziuk et al., Appl. Phys. Lett. 95, 231501 (2009)] to obtain superfast macroparticles. Two different ways of macroparticle acceleration were investigated: “forward” and “backward” acceleration. The best results for the velocity (obtained for 20 μm polystyrene foil) approach 1.0 × 108 cm/s. Also, the hydrodynamic efficiency of the energy transfer to the accelerated macroparticle is much higher compared to conventional ablative experiments. Additionally, application of the “covered channel” targets gives an evident increase of density of accelerated plasma outbursting from the channel, which is a key problem from the point of view of possible applications in impact fast ignition area.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.25.Fi Transport properties

Gd plasma source modeling at 6.7 nm for future lithography

Bowen Li, Padraig Dunne, Takeshi Higashiguchi, Takamitsu Otsuka, Noboru Yugami, Weihua Jiang, Akira Endo, and Gerry O’Sullivan

Appl. Phys. Lett. 99, 231502 (2011); http://dx.doi.org/10.1063/1.3666042 (3 pages) | Cited 7 times

Online Publication Date: 8 December 2011

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Plasmas containing gadolinium have been proposed as sources for next generation lithography at 6.x nm. To determine the optimum plasma conditions, atomic structure calculations have been performed for Gd11+ to Gd27+ ions which showed that n = 4 − n = 4 resonance transitions overlap in the 6.5–7.0 nm region. Plasma modeling calculations, assuming collisional-radiative equilibrium, predict that the optimum temperature for an optically thin plasma is close to 110 eV and that maximum intensity occurs at 6.76 nm under these conditions. The close agreement between simulated and experimental spectra from laser and discharge produced plasmas indicates the validity of our approach.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.38.Kd Laser-plasma acceleration of electrons and ions
52.50.Dg Plasma sources
52.65.-y Plasma simulation
52.80.-s Electric discharges
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions

Multimode terahertz-wave generation using coherent Cherenkov radiation

K. Kan, J. Yang, A. Ogata, T. Kondoh, K. Norizawa, and Y. Yoshida

Appl. Phys. Lett. 99, 231503 (2011); http://dx.doi.org/10.1063/1.3666043 (3 pages) | Cited 3 times

Online Publication Date: 9 December 2011

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Multimode terahertz(THz)-wave generation using coherent Cherenkov radiation (CCR) was investigated. The frequency spectra of CCR, which utilized a metal-wrapped hollow dielectric tube of 7 mm outer radius and a picosecond electron bunch of 27 MeV beam energy, were measured by a Michelson interferometer with a 4.2 K silicon bolometer. In this study, discrete spectral components at frequencies of 0.09, 0.14, and 0.36 THz were observed experimentally and explained as transverse magnetic (TM) modes of TM03, TM04, and TM09, respectively, according to a theoretical calculation for the tube.
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41.60.Bq Cherenkov radiation
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
07.60.Ly Interferometers
41.75.-i Charged-particle beams
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