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| THBAU01 |
Research Highlights from FLASH
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- J. Feldhaus, R. Treusch
DESY, Hamburg
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The Free electron LASer in Hamburg (FLASH) has started regular user operation in summer 2005, providing XUV radiation pulses with pulse energies in the 10 - 100 μJ range and pulse durations of 10 - 50 fs. The science programme at FLASH covers a broad range of novel applications including fundamental studies on atoms, ions, molecules and clusters, creation and characterisation of warm dense matter, diffraction imaging of nanoparticles, spectroscopy of bulk solids and surfaces, investigation of surface reactions and spin dynamics, and the development of advanced photon diagnostics and experimental techniques. So far, 16 science projects have been pursued involving approximately 200 scientists from 11 countries. Some of the research highlights will be presented.
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| THBAU02 |
FELICE, the Free Electron Laser for Intra-Cavity Eperiments
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- B. Redlich, A. F.G. van der Meer
FOM Rijnhuizen, Nieuwegein
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We present the status and first results of the commissioning of the new beam line FELICE, an extension of the IR User Facility FELIX. The primary purpose of this beam line is to enhance the capabilities of the facility for different types of action spectroscopy of (bio)molecules, ions, clusters and complexes in the gas-phase. FELs such as FELIX are particularly suited for this type of research and the majority of the beam time delivered is nowadays devoted to it. Despite the large number of successful experiments, it soon became clear that for certain experiments even the output of FELIX is not sufficient, especially in the FIR. As the absorption cross sections of the gas samples are inherently low, a very significant boost is possible by making use of the intra-cavity power. FELICE is designed to cover the wavelength range from 3 to 100 microns at a micropulse repetition rate of 1 GHz. It runs interleaved with FELIX at a macropulse repetition rate of up to 10 Hz. The 4-mirror resonator, extending through the radiation shielding, provides an additional focus at either one of two experimental setups: a versatile molecular beam machine and an FTICR ion trap. For the wavelength range above 35 microns, the resonator will be equipped with an insertable, partial waveguide. At this moment, an intermediate stage has been reached in which FELICE can operate in the 6–35 micron range.
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| THBAU03 |
FEL Irradiation Use for the Biochip Production Standardization
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- T. N. Goryachkovskaya, T. N. Kusnetsova, V. A. Mordvinov, S. E. Peltek
ICG SB RAS, Novosibirsk
- A. S. Kozlov, S. B. Malyshkin, A. K. Petrov
ICKC SB RAS, Novosibirsk
- V. M. Popik, M. A. Scheglov
BINP SB RAS, Novosibirsk
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The teraherz emission of the Budker INP Free electron laser was applied to the development of the scientific base for the biochip production standardization. The complementary pairings of hydrogen bonds of DNA nucleotides are the base of biochip applications. The technique is based on the method of soft nondestruction ablation developed by authors, which means the transfer of molecules to aerosol phase form solid substrate under action of the teraherz emission. The teraherz emission excites nonvalency of molecular bonds. Ablation of horseradish peroxidase biomoleculs was carried out and nondestruction of biomelecules was verified by using of an aerosol spectrometer and an electrophoresis in polyacrylamide gel. By hystochemical staining technique there was verified that peroxidase has retained its enzymatic activity. The molecular design of model biochip oligonucleotides and polymerase chain reaction analysis of ablation product were developed. The prototype of two different biochips on high resistance silicon substrate were manufactured. Requirements to the coating and immobilization of oligonucleotide probes on silicon substrate were developed. The first experiment on nondestruction ablation under teraherz emission of oligonucleotides from model biochip was achieved.
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| THBAU04 |
Millimeter Waves Sensing Behind Walls - Feasibility Study with FEL Radiation
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- M. Einat, M. Kanter, B. Litvak, A. Yahalom, B. Yu. Kapilevich
CJS, Ariel
- A. Gover
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
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The existing through-wall imaging (TWI) systems operate in 1 – 10 GHz, basically, in order to reduce an attenuation caused by building material. However, the spatial resolution is drastically degraded when the operating frequency is relatively low. On the other hand, a majority of building materials demonstrate increased losses as the frequency increases. As a result, higher RF power from the source is required. The Israeli mm-wave FEL provides unique opportunity to solve the above TWI problem permitting to deliver output power 100-1000W at 85-105 GHz. Design of TWI system operating on mm-waves needs comprehensive study of constitutive parameters of different building materials. This paper describes systematic measurements of effective attenuation constant of typical building materials such as concrete bricks, wood, tiles, sand, gypsum, etc. on mm-waves using powerful FEL radiation. Since the Rayleigh criterion for surface roughness cannot be satisfied for some of measured materials, scattering and depolarization effects lead to increasing measured attenuation in comparison with bulky material. Additional experiments were performed to estimate a contribution of these effects into the measured attenuation.
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| THBAU05 |
The Scientific Programme of the UK Fourth Generation Light Source: 4GLS
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- P. Weightman
STFC/DL, Daresbury, Warrington, Cheshire
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This talk will describe the proposed UK Fourth Generation Light Source (4GLS) and the prototype facility that is nearing completion at the Daresbury laboratory. The 4GLS design is based on a 600 MeV Energy Recovery Linear Accelerator (ERL) optimised to deliver high brightness radiation at energies below 100 eV. The ERL drives three free electron Lasers (FEL’s): an IR-FEL tunable over 2.5 to 200 mkm, a VUV-FEL tunable over 3 to 10 eV and a X ray FEL tunable over 10 to 100 eV. The source will also generate both high average power (2.6 kW) and high peak power (100 MW) sources of terahertz radiation. The emerging scientific programme for 4GLS will also be described with an emphasis on proposals to exploit its capabilities in the VUV, infrared and terahertz regions of the electromagnetic spectrum. There are particularly exciting prospects for research programmes that exploit various combinations of the 4GLS light sources in pump probe experiments
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