A High-energy, Ultrashort-pulse X-ray System for the Dynamic Study of Heavy, Dense Materials
Author: David Jeremy Gibson
Publisher:
Published: 2004
Total Pages: 300
ISBN-13:
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Author: David Jeremy Gibson
Publisher:
Published: 2004
Total Pages: 300
ISBN-13:
DOWNLOAD EBOOKAuthor: Wei Gai
Publisher: World Scientific
Published: 2012-10-05
Total Pages: 167
ISBN-13: 981440103X
DOWNLOAD EBOOKThis volume is a collection of the contributions to the 6th Annual Workshop on Polarized Positron in China. It provides an important updated to couple Linear Collider (ILC+CLIC) aimed polarized positron source R&D efforts to more general polarized positron related community with the aim of advancing polarized positron studies through exchanges and collaborations. The topics covered include: positron beams for linear colliders, but not limited to it, with the main items listed below: Polarized gamma ray generation High degree Polarized positron generation from compton scattering both ring and linac based High degree polarized positron generation from undulator radiation Stacking and accumulation of the polarized beam from compton regime Polarized beam transport, control and acceleration Channelling radiation and applications Physics applications of polarized positrons Various high intensity positron sources (include conventional) For other future colliders (SuperB for example) Positron generation target issues Physics applications of high quality X-rays and gamma rays Polarimetry at the e+ source The positron capture section and the photon collimation Review the activities of the "ILC CLIC e+ generation" working group for all schemes Status of the CDR for CLIC and TDR for ILC Polarized electron sources
Author: Wei Gai
Publisher: World Scientific
Published: 2012-10-05
Total Pages: 167
ISBN-13: 9814401056
DOWNLOAD EBOOKThis volume is a collection of the contributions to the 6th Annual Workshop on Polarized Positron held in China. It provides updated information on polarized positron source R&D efforts for future high energy linear colliders and other research activities related to the polarized positron studies.The topics covered include: positron beams for linear colliders, but not limited to it, with the main items listed below:
Author: Fang Shan
Publisher:
Published: 2006
Total Pages: 416
ISBN-13:
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Published: 1995
Total Pages: 704
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Published: 2005
Total Pages: 858
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Published: 1998
Total Pages: 135
ISBN-13:
DOWNLOAD EBOOKA variety of phenomena involves atomic motion on the femtosecond time-scale. These phenomena have been studied using ultrashort optical pulses, which indirectly probe atomic positions through changes in optical properties. Because x-rays can more directly probe atomic positions, ultrashort x-ray pulses are better suited for the study of ultrafast structural dynamics. One approach towards generating ultrashort x-ray pulses is by 90{sup o} Thomson scattering between terawatt laser pulses and relativistic electrons. Using this technique, the author generated (almost equal to) 300 fs, 30 keV (0.4 Å) x-ray pulses. These x-ray pulses are absolutely synchronized with ultrashort laser pulses, allowing femtosecond optical pump/x-ray probe experiments to be performed. Using the right-angle Thomson scattering x-ray source, the author performed time-resolved x-ray diffraction studies of laser-perturbated InSb. These experiments revealed a delayed onset of lattice expansion. This delay is due to the energy relaxation from a dense electron-hole plasma to the lattice. The dense electron-hole plasma first undergoes Auger recombination, which reduces the carrier concentration while maintaining energy content. Longitudinal-optic (LO) phonon emission then couples energy to the lattice. LO phonon decay into acoustic phonons, and acoustic phonon propagation then causes the growth of a thermally expanded layer. Source characterization is instrumental in utilizing ultrashort x-ray pulses in time-resolved x-ray spectroscopies. By measurement of the electron beam diameter at the generation point, the pulse duration of the Thomson scattered x-rays is determined. Analysis of the Thomson scattered x-ray beam properties also provides a novel means of electron bunch characterization. Although the pulse duration is inferred for the Thomson scattering x-ray source, direct measurement is required for other x-ray pulse sources. A method based on the laser-assisted photoelectric effect (LAPE) has been demonstrated as a means of measuring ultrashort x-ray pulse durations. LAPE may also serve as the basis for a gated x-ray detector.
Author: Henning Carstens
Publisher: Springer
Published: 2018-06-22
Total Pages: 103
ISBN-13: 3319940090
DOWNLOAD EBOOKThis thesis discusses the power scaling of ultrashort pulses in enhancement cavities, utilized in particular for frequency conversion processes, such as Thomson scattering and high-harmonic generation. Using custom optics for ultrashort-pulse enhancement cavities, it demonstrates for the first time that at the envisaged power levels, the mitigation of thermal effects becomes indispensable even in cavities comprising solely reflective optics. It also studies cavities with large beams, albeit with low misalignment sensitivity, as a way to circumvent intensity-induced mirror damage. Average powers of several hundred kilowatts are demonstrated, which benefit hard x-ray sources based on Thomson scattering. Furthermore, pulses as short as 30 fs were obtained at more than 10 kW of average power and employed for high-harmonic generation with photon energies exceeding 100 eV at 250 MHz repetition rate, paving the way for frequency comb spectroscopy in this spectral region.
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Published: 2002
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DOWNLOAD EBOOKThe use of short laser pulses to generate very high brightness, ultra short (fs to ps) x-ray pulses is a topic of great interest. In principle, fantosecond-scale pump-probe experiments can be used to temporally resolve structural dynamics of materials on the time scale of atomic motion. The development of sub-ps x-ray pulses will make possible a wide range of materials and plasma physics studies with unprecedented time resolution. The Thomson scattering project at LLNL will provide such a novel x-ray source of high power using short laser pulses and a high brightness, relativistic electron bunch. The system is based on a 5mm-mrad normalized emittance photoinjector, 100 MeV electron RF linac, and a 300 mJ, 35 fs solid-state laser system. The Thomson source will produce ultra fast pulses with x-ray energies (60 kev) capable of probing into high-Z metals.
Author: Nobuyuki Satofuka
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 807
ISBN-13: 3642565352
DOWNLOAD EBOOKThese proceedings contain a selection of refereed contributions as a source of reference for all those interested in the state of the art in computational fluid dynamics. The conference brings together physicists, mathematicians and engineers to review and share recent advances in the field.