advanced electric propulsion diagnostic tools at iom

Abstract Recently, we have set up an Advanced Electric Propulsion Diagnostic (AEPD) platform [1] , which allows for the in-situ measurement of a comprehensive set of thruster performance parameters. The platform utilizes a five-axis-movement system for precise positioning of the thruster with respect to the diagnostic heads. In the first setup (AEPD1) an energy-selective mass spectrometer (ESMS) and a miniaturized Faraday probe for ion beam characterization, a telemicroscope and a triangular laser head for measuring the erosion of mechanical parts, and a pyrometer for surface temperature measurements were integrated. The capabilities of the AEPD1 platform were demonstrated with two electric propulsion thrusters, a gridded ion thruster RIT 22 (Airbus Defence & Space, Germany, [13]) and a Hall effect thruster SPT 100D EM1 (EDB Fakel, Russia, [1] , [4] ), in two different vacuum facilities

Cold Plasma Wave Analysis in Magneto-Rotational Fluids

This paper is devoted to investigate the cold plasma wave properties. The analysis has been restricted to the neighborhood of the pair production region of the Kerr magnetosphere. The Fourier analyzed general relativistic magnetohydrodynamical equations are dealt under special circumstances and dispersion relations are obtained. We find the $x$-component of the complex wave vector numerically. The corresponding components of the propagation vector, attenuation vector, phase and group velocities are shown in graphs. The direction and dispersion of waves are investigated.Comment: 22 pages, 18 figures, accepted for publication in Astrophys. Space Sc

Entwicklung, Bau und Test eines RIT15 'Breadboard Engineeering Models' Schlussbericht - Kurzfassung

SIGLEAvailable from TIB Hannover: F04B1029 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDLR Deutsches Zentrum fuer Luft- und Raumfahrt e.V., Bonn (Germany)DEGerman

Job resources as contributors to wellbeing

Protecting employees from the unfavorable consequences of work-related, psychosocial risk factors and enhancing their motivation at work should be a main priority, since healthy and happy employees are important assets for organizations (for a review, see Demerouti & Cropanzano, 2010). Work psychology and occupational health literatures suggest that organizations can achieve this goal by designing resourceful work environments (Hackman & Oldham, 1980) since job resources have been found to play a dual role in employee wellbeing (Bakker & Demerouti, 2007; Demerouti, Bakker, Nachreiner, & Schaufeli, 2001). First, job resources help employees manage and deal more effectively with their job demands, thus buffering their detrimental impact on job strain and health. Second, job resources are important in their own right because the availability of resources facilitates goal attainment, thereby enhancing employee motivation, work engagement, and performance. Based on these theoretical assumptions and supportive empirical evidence (for a review, see Bakker, Demerouti, & Sanz-Vergel, 2014), organizations are encouraged to create and sustain resourceful work environments. To this end, recent studies have emphasized the role of the supervisor in this process, since certain leadership styles (e.g., transformational leadership) have been found to promote job resources (e.g., Breevaart, Bakker, Demerouti, Sleebos, & Maduro, 2014; Breevaart, Bakker, Demerouti, & Van den Heuvel, 2015)