Upgrade of the ISIR-FEL at Osaka University and oscillation experiments in the sub-millimeter wavelength region
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Monochromator
Upgrade
Free-electron laser
Optical cavity
Oscillation (cell signaling)
Abstract We present new results from the integrated numerical model of the accelerator/beam transport system and ring optical resonator of the Boeing free electron laser experiment. Modifications of the electron-beam transport have been included in a previously developed PARMELA model and are shown to reduce dramatically emittance growth in the 180° bend. The new numerically generated electron beam is used in the 3D FEL simulation code FELEX to calculate expected laser characteristics with the ring optical resonator and the 5 m untapered THUNDER wiggler. Performance sensitivity to optical cavity misalignments is studied.
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Free-electron laser
Optical cavity
Free electron model
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Monochromator is one of the most important parts of neutron Triple-Axis Spectrometer(TAS),and its performance has an effect on data detecting and analyzing.We have investigated some monochromator parameters of neutron TAS in China,ILL and LLB.Because there is different location and focus on wavelength in experiment,appropriate neutron source and location limit should be taken into account in the design of monochromator.According to the basic principle of the focusing monochromator,investigation and analysis of typical monochromator in the world,including size,crystal,research capability,we can offer references on the type and parameters for the construction of tripleaxis spectrometer monochromator.
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Abstract : The activities of the Free Electron Laser (FEL) Group at Thomas Jefferson National Accelerator Facility (JLab) in Newport News, Virginia, during the Infrared Demonstration Free Electron Laser Upgrade Project are summarized. The project spanned four years, from July 2000 to June 2004, and resulted in the upgrade from a 1 kW-class FEL to a 10 kW-class FEL at JLab. Lessons learned during the Upgrade are presented and discussed.
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Free-electron laser
Optical cavity
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The double monochromator method is applied to the calibration of the sensitivity of a monochromator in the vacuum ultraviolet region. A pre-monochromator for delivering monochromatic light and a main monochromator to be calibrated are connected in tandem as a double monochromator. The detector attached to the main monochromator is a photomultiplier coated with sodium salicylate. The monochromatic light flux from the pre-monochromator is measured by absolute detectors such as a photodiode calibrated in the region 1200 to 2300 Å. The pre-monochromator is rotated about the exit principal ray through 90 deg. so as to compensate for the polarization effect of the monochromatic light. The molecular branching ratio method is also applied to the calibration and the results are compared with the double monochromator method.
Monochromator
Monochromatic color
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Experimental studies of a Laue-Laue double-crystal monochromator for x-radiation have been conducted. It has been shown that a high-frequency ultrasonic wave can be used to adjust reflectivity of the monochromator and significantly increase its maximum throughput. In the particular case of a quartz Laue-Laue double-crystal monochromator the throughput can be increased more than six times with simultaneous broadening of the monochromator rocking curve width of three-and-a-half times. The new monochromator system is of potential interest for x-ray applications that require adjustment of the flux and energy resolution.
Monochromator
Crystal (programming language)
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Monochromator
Spallation Neutron Source
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Monochromator
Photon energy
Radiation flux
Photon flux
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