Optimal signal-to-noise ratio

All MYTHEN2 detectors are inherently free of dark current and readout noise, since the detector operates in single-photon counting mode, with an adjustable energy threshold (Advanced Pixel). The absence of any detector noise, together with a range of sensor thicknesses and strip lengths guarantees data with an excellent signal-to-noise ratio for X-ray energies ranging from Ti to Ag (increased quantum efficiency).

Fluorescence suppression

MYTHEN2 detectors provide an adjustable lower energy threshold, which can be used to suppress sample fluorescence. The fluorescent background often swamps weak signals and impairs the signal-to-noise ratio of the data. When the energy threshold of the detector is set higher than the fluorescent energy, this background is effectively suppressed. By setting the energy threshold to 6.8 keV, fast and accurate measurements of Ti-containing samples can be carried out with a standard Cu-tube (Fig.1.).

Figure 1. Comparison of data obtained with a Cu tube from a Ti powder sample. Data were collected with (a) a MYTHEN2 detector applying fluorescence suppression over 8 s and (b) a previous state-of-the-art detector over 200 s.

Radiation-Tolerant Design

The MYTHEN2 detectors are designed using radiation-tolerant layout techniques, developed for high-energy physics, to minimize any damage from incoming X-rays. The detectors are able to withstand doses arising from long-term operation even at synchrotrons. In laboratory use, MYTHEN2 systems have a virtually endless life cycle.

Maintenance-Free Operation

All MYTHEN2 R detectors are maintenance- and media-free. They are operated at room temperature and do not require any liquid cooling or dry air/gas supply. The long-term stability of the factory detector calibration eliminates the need for user recalibration.

High Modularity

In addition to the MYTHEN2 detector system’s outstanding performance, its modularity is yet another remarkable feature. The newly designed Detector Control System, DCS4, allows up to four MYTHEN2 modules to be simultaneously operated. The wide angular coverage of such multi-module detector systems is ideally suited to capturing phase transitions and collecting complete powder diffraction patterns from radiation sensitive samples prior to the onset of damage.

High Dynamic Range

The very high counter depth of 24 bits (~16.8 million) combined with the absence of detector noise ensures unprecedented data quality. Extremely strong and weak signals can be accurately detected on a single scan, allowing higher accuracy in qualitative and quantitative analyses.

Excellent Point-spread Function

A sharp point-spread function, equal to 50 μm channel, offers various benefits. Due to the direct conversion of X-rays into charge pulses, the MYTHEN2 detector system does not spread intensity between strips through blur or blooming, as in other detection technologies. Closely spaced signals, even of largely differing intensities, can be accurately resolved and measured. Sharper signals reduce overlap with scattering or other background intrinsic to the experiment, thereby improving signal-to-noise ratios. Furthermore, the high spatial resolution is ideally suited to the measurement of X-ray fluorescence spectra in dispersive spectrometers [1].

Easy Integration

Symmetrical and compact design of MYTHEN2 R systems, fixation kit for secure position of cables on DCS4, and three available interfaces for detector control (WebClient, Socket connection, SPEC) make integration of MYTHEN2 R systems easy and suitable for any diffractometer.

Multitude of Applications

The MYTHEN2 R series is highly versatile, thereby allowing its unique features to be used in a wide range of X-ray diffraction and scattering applications:

  • Pair Distribution Function (PDF) analysis
  • Phase analysis
  • Texture and thin film analysis
  • Small- and wide-angle X-ray scattering
  • Time-resolved experiments
  • Residual stress analysis

[1] Kleymenov, E. et al. (2011) Rev. Sci. Instrum. 82, 065107.