ATHENA X-IFU Demonstration Model: First Joint Operation of the Main TES Array and its Cryogenic AntiCoincidence Detector (CryoAC)

The X-IFU is the cryogenic spectrometer onboard the future ATHENA X-ray observatory. It is based on a large array of TES microcalorimeters, which work in combination with a Cryogenic AntiCoincidence detector (CryoAC). This is necessary to reduce the particle background level thus enabling part of the mission science goals. Here we present the first joint test of X-IFU TES array and CryoAC Demonstration Models, performed in a FDM setup. We show that it is possible to operate properly both detectors, and we provide a preliminary demonstration of the anti-coincidence capability of the system achieved by the simultaneous detection of cosmic muons

Onveranderbaar gewichtig? Op zoek naar vermijdbare ondervoeding

Malnutrition still is highly prevalent among nursing home residents according to the LPZ (Landelijke Prevalentiemeting Zorgproblemen). A multidisciplinary guideline regarding appropriate fluid and food supply and projects to improve feeding problems in nursing homes obviously had little or no effect on the prevalence of malnutrition among nursing home residents. The LPZ findings are discussed in this article as is the evidence for the multidisciplinary guideline. It is concluded that the expectation of a decline of the prevalence of malnutrition is not based on sound research findings and therefore is to optimistic. The high prevalence of end-stages of several non-curable diseases makes a substantial percentage of malnutrition among nursing home residents probably 'unavoidable'. New research should focus on identification of nursing home residents who suffer from 'avoidable' malnutrition and on further development of already proven and promising interventions like 'family style mealtimes'

Study of TES Detector Transition Curve to Optimize the Pixel Design for Frequency-Division Multiplexing Readout

Superconducting transition-edge sensors (TESs) are highly sensitive detectors. Based on the outstanding performance on spectral resolution, the X-ray integral field unit (X-IFU) instrument on-board athena will be equipped with a large array of TES-based microcalorimeters. For optimal performance in terms of the energy resolution, it is essential to limit undesirable nonlinearity effects in the TES detector. Weak-link behavior induced on the TES by superconducting leads is such a nonlinearity effect. We designed and fabricated smart test structures to study the effect of the superconducting leads on the intrinsic transition curve of our TiAu-based TES bilayer. We measured and analyzed the resistance versus temperature transition curves of the test structures. We found relations of long-distance proximity effects with TES length and different lead materials. Based on these results, we can redesign and further optimize our TES-based X-ray detectors.Accepted Author ManuscriptImPhys/Optic