SHERPA: A Spectrometer with High Energy Resolution and Polarisation Analysis

Measurements with an innovative high energy resolution Thomson Parabola Spectrometer

In recent years a new concept of particle acceleration has gained interest. It is based on high power, short pulse lasers interacting with thin metal foils. In the interaction process the target is suddenly ionized and the charge separation, originating from different phenomena, can efficiently accelerate ions and in particular protons from the target impurities. The peculiar characteristics of...

High-resolution polarisation vision in a cuttlefish

Figure 1. High-resolution polarisation vision in Sepia plangon improves image contrast. (A) S. plangon responded to looming stimuli that differed in angle of polarisation from the background with an innate deimatic diplay (brightening of body colour). Left portion = pre-stimulus; right portion = post stimulus. (B) Normalized response strength (see Supplemental Information for further details) d...

The High Resolution K 600 Spectrometer

High-efficiency high-energy-resolution spectrometer for inelastic X-ray scattering

A nine-element analyzer system for inelastic X-ray scattering has been designed and constructed. Each individual analyzer crystal is carefully aligned with an inverse joystick goniometer. For the analyzers silicon wafers with 100 mm diameter are spherically bent to 1 or 0.85 m radius, respectively. Additionally, an analyzer with an extra small radius of 0.182 m and diameter of 100 mm was constr...

Low-energy inverse photoemission spectroscopy using a high-resolution grating spectrometer in the near ultraviolet range.

An inverse photoemission spectroscopy (IPES) apparatus using a Czerny-Turner grating spectrometer is demonstrated. Previous IPES instruments based on grating spectrometers used a concave grating and operated in the vacuum ultraviolet range. The reflectance of such gratings is lower than 20% and the aberration cannot be finely corrected leading to an energy resolution of up to 0.1 eV. In the pre...