Compact source of narrowband and tunable X-rays for radiography

We discuss the development of a compact X-ray source based on inverse-Compton scattering with a laser-driven electron beam. This source produces a beam of high-energy X-rays in a narrow cone angle (5–10 mrad), at a rate of 108 photons-s_1. Tunable operation of the source over a large energy range, with energy spread of ~50%, has also been demonstrated. Photon energies \u3e10 MeV have been obtained. The narrowband nature of the source is advantageous for radiography with low dose, low noise, and minimal shielding

All-optical structuring of laser-driven proton beam profiles data sets

This data repository contains analyzed data files of the shown figures and simulation input files. Please see the according README.txt files in the individual directories and the original manuscript for guidance. Manuscript title: All-optical structuring of laser-driven proton beam profiles Authors: Lieselotte Obst, Tim Ziegler, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas E. Cowan, Chandra B. Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried H. Glenzer, Axel Huebl, Arie Irman, Siegfried H. Glenzer, Axel Huebl, Arie Irman, Jongjin B. Kim, Thomas Kluge, Stephan Kraft, Florian Kroll, Josefine Metzkes-Ng, Richard Pausch, Irene Prencipe, Martin Rehwald, Christian Rödel, Hans-Peter Schlenvoigt, Ulrich Schramm, Karl Zeil Submitted to: Nature Communications (2018) Responsible for the data repository: Lieselotte Obst-Huebl, TU Dresden and HZDR Axel Huebl, TU Dresden and HZDR Tim Ziegler, TU Dresden and HZDR Thomas Kluge, HZD

Exposure to house dust endotoxin and allergic sensitization in adults.

Background:  It has been suggested that exposure to elevated levels of endotoxin decreases the risk of allergic sensitization. Objective:  To examine the associations between current exposure to bacterial endotoxin in house dust and allergic sensitization in adults. Methods:  In 1995–1996, we conducted a nested case–control study following a cross-sectional study performed within the European Community Respiratory Health Survey (ECRHS). Data of 350 adults aged 25–50 years was analysed. Allergic sensitization was assessed by measurement of specific immunoglobulin E (IgE) against several inhalant allergens. Living room floor dust samples were taken. The endotoxin content was quantified using a chromogenic kinetic Limulus amoebocyte lysate test. Results:  Multiple logistic regression analysis showed a negative association between exposure to house dust endotoxin and severe allergic sensitization. Odds ratios (95% CI) adjusted for place of residence, gender, age, and ‘caseness’ were 0.80 (0.64–1.00) for sensitization to ≥1 allergen and 0.72 (0.56, 0.92) for sensitization to ≥2 allergens using 3.5 kU/l as a cut-off value for sensitization. With regard to single allergens, the protective effect of endotoxin was strongest for pollen sensitization [aOR (95% CI) = 0.74 (0.58, 0.93)]. Conclusion:  Our results indicate that current exposure to higher levels of house dust endotoxin might be associated with a decreased odds of allergic sensitization in adults. &nbsp

An all-optical synchrotron light source

We report on the generation of synchrotron radiation from laser accelerated relativistic electrons propagating through an undulator. We indicate that this provides exciting novel opportunities in ultrafast spectroscopy

Synchrotron radiation from laser-accelerated monoenergetic electrons

In this paper, we report on the generation of incoherent synchrotron radiation in the visible spectral range which is produced by laser-accelerated electrons with 55-75-MeV energy as they propagate through an undulator. Simultaneous detection of electron and photon spectra allows for precise comparison between experimental results and undulator theory. First- and second-order undulator radiation was detected. The agreement between experiment and theory and the exclusion of other effects proves that the observed radiation is generated in the undulator. Beyond that, this experiment introduces laser-accelerated electrons into the radio-frequency accelerator domain of synchrotron light sources. This marks a noticeable step toward a new, compact, and brilliant short-wavelength light source