ABSTRACT
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 10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. Results are compared to the three-dimensional SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL systems. An agreement between simulations and experimental results has been obtained at an unprecedented level of detail.
ABSTRACT
Diabetes has not been linked to acquired ichthyosis or ichthyosis vulgaris. We report a newly diagnosed diabetic 14-year-old girl with bilateral tibial and sacral ichthyosiform plaques and a hemoglobin A1c of 20.1%. The patient had no personal or family history of atopy or ichthyosis and lacked keratosis pilaris or hyperlinear palms. A biopsy specimen of an ichthyosiform plaque showed compact lamellar orthohyperkeratosis and hypogranulosis, histopathology consistent with either ichthyosis vulgaris or acquired ichthyosis. We speculate that our patient's new-onset diabetes induced acquired ichthyosis.
