نتایج جستجو برای: ion laser
تعداد نتایج: 382100 فیلتر نتایج به سال:
Within the framework of this thesis the generation of neutrons using ultrashort laser pulses with moderate pulse energy was investigated. On the one hand, the aim was directed towards the development of a neutron source, whose optimization naturally calls for a detailed understanding of the underlying neutron production processes. Since the highest neutron yields are achieved by nuclear reactio...
We present the results of a detailed study on the acceleration of intense ion beams by relativistic laser plasmas. The experiments were performed at the 100 TW laser at the Laboratoire pour L’Utilisation des Lasers Intenses (LULI). We investigated the dependence of the ion beams on the target conditions based on theoretical predictions by the target normal sheath acceleration (TNSA) mechanism. ...
The electric fields produced by the interaction of ultra-short and ultra-intense laser pulses with a thin target make it possible to obtain multiMeV , high density, highly collimated proton and ion beams with duration in the sub-picosecond range. Critical features are the efficiency of the ion acceleration process and the energy spectrum of the produced ion beam. At high laser intensities the r...
Laser ion sources are used to generate and deliver highly charged ions of various masses and energies. We present details on the design and basic parameters of the DCU laser ion source (LIS). The theoretical aspects of a high voltage (HV) linear LIS are presented and the main issues surrounding laser-plasma formation, ion extraction and modeling of beam transport in relation to the operation of...
Sensitive methods have been developed to measure laser-induced fluorescence from trapped ions by reducing the detection of background scattering to zero levels during the laser excitation pulse. The laser beam diameter has been reduced to approximately 150 microm to eliminate scattering on trap apertures and the resulting laser-ion interaction is limited to a volume of approximately 10(-5) cm w...
All-optical approaches to particle acceleration are currently attracting a significant research effort internationally. Although characterized by exceptional transverse and longitudinal emittance, laser-driven ion beams currently have limitations in terms of peak ion energy, bandwidth of the energy spectrum and beam divergence. Here we introduce the concept of a versatile, miniature linear acce...
We gauged the internal energy transfer for two dissociative ion decomposition channels in matrix-assisted laser desorption ionization (MALDI) using the benzyltriphenylphosphonium (BTP) thermometer ion [PhCH 2PPh 3] (+). Common MALDI matrixes [alpha-cyano-4-hydroxycinnamic acid (CHCA), 3,5-dimethoxy-4-hydroxycinnamic acid (sinapinic acid, SA), and 2,5-dihydroxycinnamic acid (DHB)] were studied w...
This paper reviews the many recent advances at the Center for Ultrafast Optical Science (CUOS) at the University of Michigan in multi-MeV ion beam generation from the interaction of short laser pulses focused onto thin foil targets at intensities ranging from 10 17 to 10 19 W/cm 2 . Ion beam characteristics were studied by changing the laser intensity, laser wavelength, target material, and by ...
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