نتایج جستجو برای: fel

تعداد نتایج: 2243  

2004
Florian Löhl

The TESLA Test Facility (TTF) linear accelerator (linac) at DESY has been extended to drive a new Free Electron Laser facility (VUV-FEL) in the wavelength range from the vacuum-ultraviolet (VUV) to soft Xrays. With the upgraded photo injector and increased electron beam energy up to 1GeV, wavelengths down to 6 nm can be achieved. During the commissioning phase of the VUV-FEL the emphasis is on ...

2002
E. L. Saldin E. A. Schneidmiller M. V. Yurkov

We propose a concept for production of high power coherent attosecond pulses in X-ray range. An approach is based on generation of 8th harmonic of radiation in a multistage HGHG FEL (high gain high harmonic free electron laser) configuration starting from shot noise. Single-spike phenomena occurs when electron bunch is passed through the sequence of four relatively short undulators. The first s...

Journal: :Lasers in surgery and medicine 2000
K M Joos J H Shen D J Shetlar V A Casagrande

BACKGROUND AND OBJECTIVE To determine whether 6.45-microm free electron laser (FEL) energy can successfully perform optic nerve sheath fenestration and to compare the acute and chronic cellular responses with this surgery. STUDY DESIGN/MATERIALS AND METHODS Optic nerve sheath fenestration was performed in rabbits by using either FEL energy (< 2.5 mJ, 10 Hz, 325-microm spot size) or a knife. T...

2000
X. J. Wang

Consensus reached in the last few years that fourth generation light source will most likely be a X-ray or a UV coherent source based on single-pass high-gain free electron laser (FEL), such as Self Amplified Spontaneous Emission (SASE), or seeded high-gain harmonic -generation (HGHG) free electron lasers. High -gain (> 10) required for single-pass FEL puts great constrain on the quality of ele...

2009
Nicole Schmitz Klaus Dietmeier Monika Bauer Melanie Maudrich Stefan Utzinger Simone Muntwiler Philippe Saudan Martin F. Bachmann

Allergen-specific desensitization is the only disease-modifying therapy currently available for the treatment of allergies. These therapies require application of allergen over several years and some may induce life-threatening anaphylactic reactions. An ideal vaccine for desensitization should be highly immunogenic and should alleviate allergic symptoms upon few injections while being nonreact...

2000
D. Douglas

The Jefferson Lab (JLab) IR Demo Free Electron Laser (FEL) has completed commissioning and is initiating user service. The FEL — a high repetition rate, low extraction efficiency wiggler-driven optical cavity resonator — produces over 1 kW of tuneable light on intervals in a 3–6 μm wavelength range. It is driven by a 35–48 MeV, 5 mA superconducting RF (SRF) based energyrecovering continuous wav...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2003
A Murokh R Agustsson M Babzien I Ben-Zvi L Bertolini K van Bibber R Carr M Cornacchia P Frigola J Hill E Johnson L Klaisner G Le Sage M Libkind R Malone H-D Nuhn C Pellegrini S Reiche G Rakowsky J Rosenzweig R Ruland J Skaritka A Toor A Tremaine X Wang V Yakimenko

VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. The experiment was performed at the Accelerator Test Facility at BNL, using a high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding a total gain of 2 x 1...

2006
S. Reiche

Self-amplifying spontaneous radiation free-electron lasers, such as the LCLS or the European X-FEL, rely on the incoherent, spontaneous radiation as the seed for the amplifying process. Though this method overcomes the need for an external seed source one drawback is the incoherence of the effective seed signal. The FEL process allows for a natural growth of the coherence because the radiation ...

1998
A. Abramovich A. Gover

The experimental results of radiated power and its spectral parameters as measured on the Israeli electrostatic accelerator tandem FEL (EA-FEL) are interpreted and numerically simulated. Two complementary simulation codes, FEL3D and MALT1D show good agreement with experimental results. The FEL3D code (a non-linear threedimensional ‘amplifier’ code, based on a coupled-mode approach), was employe...

2017
S B van der Geer E J D Vredenbregt O J Luiten M J de Loos

Ultracold electron sources based on near-threshold photoionization of laser-cooled atomic gases can produce ultrashort electron pulses with a brightness potentially exceeding conventional pulsed electron sources. They are presently being developed for single shot ultrafast electron diffraction, where a bunch charge of 100 fC is sufficient. For application as an injector for x-ray free electron ...

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