نتایج جستجو برای: fel haye hessi
تعداد نتایج: 2393 فیلتر نتایج به سال:
Allergic responses can be triggered by structurally diverse allergens. Most allergens are proteins, yet extensive research has not revealed how they initiate the allergic response and why the myriad of other inhaled proteins do not. Among these allergens, the cat secretoglobulin protein Fel d 1 is a major allergen and is responsible for severe allergic responses. In this study, we show that sim...
The commissioning of a terahertz-field-driven streak camera installed at the free-electron laser (FEL) FLASH at DESY in Hamburg, being able to deliver photon pulse duration as well as arrival time information with ∼10 fs resolution for each single XUV FEL pulse, is reported. Pulse durations between 300 fs and <15 fs have been measured for different FLASH FEL settings. A comparison between the X...
Radiation safety is one of the most important issues for free electron laser [FEL] facilities and the users. Many FEL facilities are under operation worldwide, and their number is growing. The wave length of FEL ranges from a few millimeters to about 0.5 nm, and the electron energy is from a few MeV to about 20 GeV. Furthermore, various kinds of electron accelerator types are constructed for FE...
A large amplitude upper hybrid wave has potential to be employed as a wiggler for the generation of high frequency coherent radiation via free electron laser (FEL) instability. At a density fluctuation level of a few percent, due to the upper hybrid wave, the growth time of FEL instability, with electron beam current of a few kilo ampere, turns out to be of the order of a nanosecond. The growth...
We developed higher-harmonic free-electron laser (FEL) oscillations with the storage ring NIJI-IV from the visible to near-infrared region. Using another “higher order”, that is, higher-diffraction order of the target wavelength of dielectric multilayer mirrors, we realized a lasing on the highest order in the harmonic FELs. Moreover, the FEL wavelength was shortened to the visible region in th...
FEL experiments in the NIR region were carried out with a compact storage ring NIJI-IV at the National Institute of Advanced Industrial Science and Technology. Spontaneous emission spectra from the optical klystron ETLOK-III were measured at wavelengths around 850 nm. High-reflectance cavity mirrors were set in mirror chambers this August. The cavity loss was measured to be about 0.2%, and the ...
Due to the lack of coherent seed at the x-ray wavelengths, a SASE FEL is the most straightforward method to build an x-ray FEL. However, the temporal coherence of a SASE FEL is limited because the process starts from electron shot noise. To overcome this limitation, an ultraviolet seed laser may be used to interact with the electron beam in order to create density modulations at higher harmonic...
BACKGROUND Avoidance of allergen exposure is an effective measure for preventing naÏve and allergic individuals from sensitization (primary intervention) and disease aggravation (secondary intervention), respectively. Regular monitoring of the allergens in the environment is required for the effective intervention. Thus, there is a need for cost-effective test kits for environmental allergen qu...
FERMI@Elettra is a free electron-laser (FEL)-based user facility that, after two years of commissioning, started preliminary users’ dedicated runs in 2011. At variance with other FEL user facilities, FERMI@Elettra has been designed to deliver improved spectral stability and longitudinal coherence. The adopted scheme, which uses an external laser to initiate the FEL process, has been demonstrate...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید